Luciano Segura | Universidad Nacional de La Plata (original) (raw)

Papers by Luciano Segura

Research paper thumbnail of Cooperative harassment strategy by the European Starling to usurp cavities and reproductive cost for the neotropical Green-barred Woodpecker

Research paper thumbnail of Concerningly high breeding success rates for the European Starling after a recent invasion in the Neotropics

The European Starling is a highly invasive passerine that recently started to expand throughout S... more The European Starling is a highly invasive passerine that recently started to expand throughout South America. Despite its negative impacts on the native fauna, there are no reports of its breeding success, the population recruitment rate, or the factors affecting its nest success in these recently invaded natural habitats. In this study we monitored 100 European Starling nests in a native forest of central-eastern Argentina, during the 2020–2021 and 2021–2022 breeding seasons. We estimated the most common breeding parameters for the population (clutch size, number of fledglings, nest fate, nest survival) and measured nest-site features at different spatial scales to assess if they affected nest survival. Starlings used natural and woodpecker cavities, and nest initiation peak was in September. Successful nests produced ~ 3 fledglings and estimated nest success was 38%. Daily survival rates were negatively affected by nest-tree diameter at breast height. Nest survival was high compa...

Research paper thumbnail of The Impacts of Parasitic Flies (Philornis spp.) on Nestlings of Three Passerines in a Southern Temperate Forest of Argentina

Ardeola, 2021

Summary. Philornis flies exert strong negative selection on avian host life histories. However, t... more Summary. Philornis flies exert strong negative selection on avian host life histories. However, their possible influence at the southern limits of parasite distribution remains poorly studied. We collected data on Philornis parasitism (prevalence, parasite load and latency) during three consecutive breeding seasons of the Masked Gnatcatcher Polioptila dumicola, Vermilion Flycatcher Pyrocephalus rubinus and Blue-and-yellow Tanager Pipraeidea bonariensis in a south temperate forest in Argentina. We hypothesised that Philornis parasitism would negatively influence both the growth and survival of infected nestlings. Regarding body size differences among nestlings of these three host species, we predicted that nestling survival in parasitised nests and parasite load per nestling would be greater the larger the species, and that the number of growth parameters that differ between parasitised and non-parasitised nestlings would be greater the smaller the species. We monitored 564 nests and found prevalence to be 16.7% for the Masked Gnatcatcher, 30.1% for the Vermilion Flycatcher, and 37.9% for the Blue-and-yellow Tanager. Parasitism increased during the season for all three species. As predicted, for the three species, nestling survival was lower in parasitised nests (∼30%) than in non-parasitised nests (∼90%) and for each species, one or more growth parameters were significantly lower for parasitised nestlings compared to non-parasitised nestlings. Our prediction relating to host body size was partially supported since differences in parasite load only emerged in nests that produced fledglings, as well as in the extent of growth parameters affected. This is the first study providing detailed data of Philornis fly parasitism and how this parasite affects the fitness of three bird hosts at the southern limit of the parasite's distribution.—Gonzalez, E., Jauregui, A. & Segura, L.N. (2022). The impacts of parasitic flies (Philornis spp.) on nestlings of three passerines in a southern temperate forest of Argentina. Ardeola, 69: 3-20.

Research paper thumbnail of Unusual nest and nestling appropriation y the eared dove ( Zenaida auriculata )

Ornitologia Neotropical, 2016

∙ We report a case of interspecific nest appropriation by the Eared Dove ( Zenaida auriculata ) o... more ∙ We report a case of interspecific nest appropriation by the Eared Dove ( Zenaida auriculata ) on a nest of the Creamy‐bellied Thrush ( Turdus amaurochalinus ). The usurpation attempt resulted in the death of both nestlings, including a parasitic cowbird, despite forceful attempts by the thrushes to retake their nest and repeated attempts by the dove to feed the nestlings. We believe that the loss of the dove offspring from a nest in a neighboring tree could have triggered this behavior, which may be a hormonal byproduct caused by the recent loss of their own offspring, similar to what has been observed in Emperor Penguins ( Aptenodytes fosteri ). Resumen ∙ Inusual apropiacion de nido y pichones por parte de la Paloma Torcaza (Zenaida auriculata) Reportamos un caso de apropiacion interespecifica de nido en donde una Torcaza ( Zenaida auriculata ) usurpa el nido de un Zorzal Chalchalero ( Turdus amaurochalinus ). Ambos pichones, incluido un pichon parasito de cria, resultaron muerto...

Research paper thumbnail of Southernmost record of Yellow-headed Vulture, Cathartes burrovianus Cassin, 1845 (Cathartiformes, Cathartidae), in Buenos Aires province, Argentina

Check List, 2018

We report the southernmost record of Yellow-headed Vulture, Cathartes burrovianus, in Punta Piedr... more We report the southernmost record of Yellow-headed Vulture, Cathartes burrovianus, in Punta Piedras, north-eastern Buenos Aires province, Argentina. This record implies the presence of this species in a new habitat: the Pampas ecoregion. Considering this and other records in Argentina and Uruguay, the species distribution could be extending south from its known range.

Research paper thumbnail of A completely leucistic Rufous-bellied Thrush (Turdus rufiventris) breeding successfully in central-east Argentina

Revista Brasileira de Ornitologia, 2018

Color abnormalities are well known phenomena in birds, although most cases are not described in l... more Color abnormalities are well known phenomena in birds, although most cases are not described in literature (Gonçalvez-Jr. et al. 2008). Leucism produces individuals with white feathers, and this condition can either be partial or complete (totally white plumage), in which case it can be mistaken for albinism (a complete lack of melanin, including feathers, bill, legs and eyes) (van Grouw 2013). Adult leucistic birds are rarely found in the wild (Bensch et al. 2000), as they usually have a lower survival rate compared to normally colored individuals (Møller et al. 2013). These birds may suffer harassment by conspecifics and they can have deficiencies in how they reflect solar energy during early development stages (Slagsvold et al. 1988, Konter 2015). They are also prone to predation due to their conspicuousness (Santos 1981, Slagsvold et al. 1988, Gonçalvez-Jr. et al. 2008) and, since avian sexual selection is linked to coloration in most species (Hill 2006), their mating success is usually compromised (Truax & Siegel 1982). Besides visual perception of color, the lack of pigments also affects the structural properties of feathers (Bortolotti 2006). In this sense, Burtt-Jr. (1986) demonstrated that feathers containing melanin could resist abrasion for longer periods of time than white feathers, and Schreiber et al. (2006) reported an albino bird that could complete its nestling stage, but one year after fledging it was unable to fly due to a high degree of degradation in all its feathers. In this communication,

Research paper thumbnail of Breeding phenology and nest survival of Cinereous (Circus cinereus) and Long-winged (C. buffoni) Harriers in the agricultural landscapes of north-east Patagonia, Argentina

Emu - Austral Ornithology, 2017

We present novel data on breeding ecology and nest survival of the Cinereous (Circus cinereus) an... more We present novel data on breeding ecology and nest survival of the Cinereous (Circus cinereus) and Long-winged (C. buffoni) Harriers in modified grasslands of southern Argentina and we evaluate variations in daily nest survival rates (DSR) in relation to temporal and habitat variables. We studied three mixed nesting colonies embedded in agricultural landscapes along a road. We found that DSR decreased linearly with time of breeding and increased with vegetation height above the nest and the distance to the road. This is the first and most complete reproductive study concerning two species of conservation concern, namely the Cinereous and Long-winged Harriers in Patagonia. Our study provides valuable and novel insights into the population dynamics of these little-known species.

Research paper thumbnail of Nesting biology of the Narrow-billed Woodcreeper (Lepidocolaptes angustirostris) in a southern temperate forest of central-east Argentina

Studies on Neotropical Fauna and Environment, 2019

We present data on the nesting biology of the Narrow-billed Woodcreeper (Lepidocolaptes angustiro... more We present data on the nesting biology of the Narrow-billed Woodcreeper (Lepidocolaptes angustirostris) in a natural forest in central-east Argentina. A total of 18 nests were found during four breeding seasons (2015-2019; from September to January), located in cavities (natural, artificial and woodpecker cavities). The incubation period lasted 16 days and eggs were larger than those from northern populations. Nestlings stayed in the nest for 17 days and we could measure nestlings at two nests. Within the forest, nests were built in large native trees. Seven nests were successful, nine were depredated and two were abandoned. The average nest daily survival rate (DSR) was estimated as 0.96, giving a cumulative chance of nest survival in a nesting cycle of 24%. Our study provides the first estimate of the nest DSR for the species and new records on the nesting biology of a poorly known Neotropical bird.

Research paper thumbnail of Breeding Phenology and New Host List of the Black-Headed Duck (Heteronetta atricapilla) In Argentina

The Wilson Journal of Ornithology, 2017

Research paper thumbnail of Reproductive parameters of the Turquoise-fronted Parrot (Amazona aestiva) in the dry Chaco forest

Avian Conservation and Ecology, 2017

The progressive exploitation and destruction of nesting habitat in recent years, combined with th... more The progressive exploitation and destruction of nesting habitat in recent years, combined with the substantial pressure from legal and illegal removal of wild nestlings and adults, justifies the development of a comprehensive study on the reproductive biology of the Turquoise-fronted Parrot (Amazona aestiva). We analyzed breeding parameters in a wild protected population of Turquoise-fronted Parrots in the Chaco forest, Argentina, examining variation among years, over the course of the breeding season, and in relation to the age of the nest. Mean clutch-size per nesting attempt was 3.68 eggs. Hatching success (proportion of eggs laid that hatch) was 0.73. Fledging success (proportion of nestlings that fledge) was 0.88. The overall breeding success (mean number of fledglings per laying female per year) was 0.95. Clutch size did not vary among years but it decreased with the delay of the nest initiation date. Hatching failure was the greatest cause of egg partial losses, and brood reduction was the main cause of nestling partial loses. Brood reduction was positively correlated with clutch size and with egg-laying date. We did not find interannual variation in any of the clutch or brood size variables. Our results showed that the population of Turquoise-fronted Parrots in the dry Chaco forest has high values of clutch size and nestling survival, and low values of hatching success. However, some aspects of the breeding biology need more attention, especially if the species continues to be harvested. Paramètres de reproduction de l'Amazone à front bleu (Amazona aestiva) dans la forêt sèche du Chaco RÉSUMÉ. L'exploitation et la destruction progressives de l'habitat de nidification advenues ces récentes années, combinées à la pression élevée de captures légale et illégale d'oisillons et d'adultes sauvages, justifient la mise en place d'une étude globale sur la biologie de reproduction de l'Amazone à front bleu (Amazona aestiva). Nous avons analysé les paramètres de reproduction d'une population sauvage protégée de cette amazone dans la forêt du Chaco, en Argentine, examinant les variations interannuelles, tout au long de la saison de reproduction, en relation avec l'âge du nid. La taille moyenne de la ponte par tentative de nidification était de 3,68 oeufs. Le succès d'éclosion (proportion d'oeufs pondus qui ont éclos) était de 0,73. Le succès à l'envol (proportion de jeunes qui ont pris leur envol) était de 0,88. Le succès de nidification d'ensemble (nombre moyen de jeunes à l'envol par femelle nicheuse par année) était de 0,95. La taille de la ponte n'a pas varié d'une année à l'autre, mais était plus faible lorsque la date d'initiation du nid était retardée. L'échec de l'éclosion était la cause la plus importante de perte partielle d'oeufs et une couvée réduite était la cause principale de perte partielle d'oisillons. La couvée réduite était positivement corrélée avec la taille de la ponte et la date de celle-ci. Nous n'avons pas observé de variations interannuelles des variables relatives à la taille de la ponte ou de la couvée. Nos résultats indiquent que la population de l'Amazone à front bleu de la forêt sèche du Chaco montre des valeurs élevées de la taille de ponte et de la survie des oisillons, mais des valeurs faibles du succès d'éclosion. Néanmoins, nous pensons qu'il serait important de se pencher davantage sur certains éléments de la biologie de reproduction de l'espèce, particulièrement si elle continue d'être prélevée.

Research paper thumbnail of Genetic structure reveals management units for the yellow cardinal (Gubernatrix cristata), endangered by habitat loss and illegal trapping

Conservation Genetics, 2017

Research paper thumbnail of Nest Survival and Predation in Blue-Fronted ParrotsAmazona aestiva: Effects of Nesting Behaviour and Cavity Characteristics

Ardea, 2016

Nest survival is the result of a wide range of processes, including intra-and interspecific inter... more Nest survival is the result of a wide range of processes, including intra-and interspecific interactions (i.e. competition, parasitism and predation), parental condition and behaviour, and weather (Newton 1998, Lima 2009). Temporal patterns, such as the date at which the nesting attempt started (i.e. time of breeding) or the stage of the nesting cycle (i.e. nest age), often influence nest survival (

Research paper thumbnail of La distancia entre los parches de bosque y el tamaño de los árboles influyen en la abundancia del cardenal común (Paroaria coronata) en bosques naturales de Argentina

Research paper thumbnail of Nest survival of the Red-crested Cardinal (Paroaria coronata) in a modified habitat in Argentina / Supervivencia de nidos del Cardenal Común (Paroaria coronata) en un habitat modificado en Argentina

Ornitologia Neotropical, Dec 1, 2012

Nest survival of the Red-crested Cardinal (Paroaria coronata) in a modified habitat in Argentina.... more Nest survival of the Red-crested Cardinal (Paroaria coronata) in a modified habitat in Argentina.-Modification of nesting sites caused by human activity can have a negative effect on the reproductive success of birds. In recent decades, a population of Red-crested Cardinal (Paroaria coronata) was established in a modified forest with ecotourism intense activity. In this paper, we model the daily nest survival rate of this population of Red-crested Cardinal and we assessed the effect of time of season, age of nest and environmental variables. Between 2007 and 2009 we monitored 69 nests found in areas with different eco-tourist activity and we used the program MARK to estimate and model the daily survival rates. Only six nests produced fledglings and the main cause of nest failure was predation (88%). Nest survival increased with the vegetation cover around the nest and decreased with the date of the breeding season. We found no significant effect in nest survival of the activities related to ecotourism. The coverage around the nest could reduce their exposure by decreasing their detectability and hindering the access of predators, while the decrease in survival over the season could be the result of changes in the community of predators. The low nest survival associated with high rates of nest predation suggest that, in this study site, predator community could be being affected by human habitat alterations.

Research paper thumbnail of Red-crested Cardinals use color and width as cues to reject Shiny Cowbird eggs

The Auk, 2016

As part of the coevolutionary process between brood parasites and their hosts, the latter have de... more As part of the coevolutionary process between brood parasites and their hosts, the latter have developed different strategies to discriminate and reject parasitic eggs. This recognition-rejection process is the primary host defense against costly brood parasitism. The Red-crested Cardinal (Paroaria coronata) is an occasional host of the generalist Shiny Cowbird (Molothrus bonariensis) that successfully rejects all parasitic eggs. We studied the cues used by Redcrested Cardinals to recognize and reject foreign eggs by experimentally adding real parasite and host eggs painted as mimetic or nonmimetic of host eggs and analyzing whether eggshell coloration and/or shape were used as cues for egg rejection. Rejection rates, mostly through egg ejection, were high for all nonmimetic eggs (95% for unpainted cowbird eggs and 100% for painted nonmimetic cowbird and host eggs). On the contrary, they were low for mimetic host eggs (6% for unpainted host eggs and 20% for painted mimetic host eggs), but intermediate for painted mimetic cowbird eggs (55%). We also found that egg width significantly affected the probability of rejection, with wider parasitic eggs (i.e. more different from host eggs) more frequently rejected. We report for the first time that egg width is an important cue for recognition and ejection of cowbird eggs in an open-cup-nesting host. Our results show that coloration is a reliable cue used by Red-crested Cardinals to discriminate and reject parasitic eggs, but when coloration alone does not allow discrimination of foreign eggs, this host uses egg width as an additional cue.

Research paper thumbnail of Nest site selection by the Red-crested Cardinals (Paroaria coronata) in natural forest of Argentina / Selección de sitios de nidificación del Cardenal Común (Paroaria coronata) en bosques naturales de Argentina

ORNITOLOGIA NEOTROPICAL

The offspring survival in arboreal bird nests depends on tree species, size, surrounding vegetati... more The offspring survival in arboreal bird nests depends on tree species, size, surrounding vegetation, and the location of the nest in the tree crown. Both of the dominant tree species in the studied forest are used by for nest location. We studied the reproductive biology of the Red-crested Cardinal (Paroaria coronata) during the breeding season 2005–2006 in order to investigate relationships between nest frequencies and tree species, size and the location in the crown in two areas of natural temperate woodlands. Two tree species were used by the cardinal, Celtis tala and Scutia buxifolia, and each of them was found to be dominant at one study site. In each area, 25 nest trees and 25 random trees were identified. Nesting frequencies indicated a strong positive association with C. tala. However, nests on S. buxifolia were observed even in the C. tala dominated area, suggesting that a high population density induces cardinals to nest on less favoured tree species. Nesting trees were hi...

Research paper thumbnail of Nesting biology of the Red-crested Cardinal (Paroaria Coronata) in south temperate forests of central Argentina

The Wilson Journal of Ornithology, 2015

ABSTRACT Studies on breeding biology in Neotropical birds are crucial for understanding different... more ABSTRACT Studies on breeding biology in Neotropical birds are crucial for understanding different aspects of their life histories and also for their conservation. We describe the nesting biology of the Red-crested Cardinal (Paroaria coronata) in central Argentina, a common suboscine that inhabits south temperate forests. We monitored 367 nests from October to February 2005–2008. Nest initiation followed a unimodal distribution with a peak in November. Within the forest, no nests were built on exotic tree species. Mean clutch size was 3.05 ± 0.05 eggs and decreased with time within the breeding season; egg size did not vary across the breeding season. Nesting cycles lasted, on average, 25.8 ± 0.1 days (nest construction: 6.1 ± 0.4 days; incubation period: 11.9 ± 0.1 days; nestling period: 13.8 ± 0.1 days). At least one young fledged in 26% of nests, 62% were depredated, and 11% were abandoned. Egg survival rate was 0.95 ± 0.02, hatching success rate was 0.84 ± 0.02, and nestling survival rate was 0.81 ± 0.03. Partial nestling losses were detected in 45% of the nests, of which 52% were because of brood reduction. Each breeding pair had on average 4.4 ± 0.2 nesting attempts over the breeding season. Our results support the prediction that small clutch sizes are associated with extensive breeding seasons and several nesting attempts within a season. Except for the short incubation period, all other breeding features reported in this study differ from those of most north temperate birds and are consistent with the life history traits of Neotropical birds.

Research paper thumbnail of Supervivencia De Nidos Del Cardenal Común (Paroaria Coronata) en Un Habitat Modificado en Argentina

Nest survival of the Red-crested Cardinal (Paroaria coronata) in a modified habitat in Argentina.... more Nest survival of the Red-crested Cardinal (Paroaria coronata) in a modified habitat in Argentina.-Modification of nesting sites caused by human activity can have a negative effect on the reproductive success of birds. In recent decades, a population of Red-crested Cardinal (Paroaria coronata) was established in a modified forest with ecotourism intense activity. In this paper, we model the daily nest survival rate of this population of Red-crested Cardinal and we assessed the effect of time of season, age of nest and environmental variables. Between 2007 and 2009 we monitored 69 nests found in areas with different eco-tourist activity and we used the program MARK to estimate and model the daily survival rates. Only six nests produced fledglings and the main cause of nest failure was predation (88%). Nest survival increased with the vegetation cover around the nest and decreased with the date of the breeding season. We found no significant effect in nest survival of the activities related to ecotourism. The coverage around the nest could reduce their exposure by decreasing their detectability and hindering the access of predators, while the decrease in survival over the season could be the result of changes in the community of predators. The low nest survival associated with high rates of nest predation suggest that, in this study site, predator community could be being affected by human habitat alterations. Resumen.-La modificación de los sitios de nidificación causada por la actividad humana puede tener un efecto negativo sobre el éxito reproductivo de las aves. En las últimas décadas, una población de Cardenal Común (Paroaria coronata) se estableció en un bosque modificado con una intensa actividad de ecoturismo. En este trabajo modelamos la tasa diaria de supervivencia de nidos (TDSN) de esta población de cardenales y evaluamos el efecto de variables ambientales y temporales en la TDSN. Entre 2007 y 2009 monitoreamos 69 nidos encontrados en áreas con distinta actividad eco-turística y usamos el Programa MARK para estimar y modelar las TDSNs. Sólo seis nidos (9%) produjeron volantones y la principal causa de fracaso fue la depredación (61 nidos, 88%). La TDSN aumentó con la cobertura de vegetación en los alrededores del nido y disminuyó con la fecha de la temporada reproductiva. No encontramos un efecto significativo en las TDSNs de las actividades vinculadas al ecoturismo. La mayor cobertura alrededor del nido podría reducir su exposición disminuyendo su detectabilidad y dificultando el acceso de los depredadores, mientras que la disminución de la supervivencia a lo largo de la temporada podría ser el resultado de variaciones numéricas en la comunidad de depredadores. Los bajos valores de TDSNs del cardenal asociados a elevadas tasas de depredación sugieren que la comunidad de depredadores podría estar siendo afectada por la cercanía a los grandes centros urbanos. Aceptado el 5 de diciembre de 2012.

Research paper thumbnail of Microhabitat Nest Cover Effect on Nest Survival of the Red-Crested Cardinal

The Wilson Journal of Ornithology, 2012

ABSTRACT We evaluated the influence of microhabitat vegetation cover on Red-crested Cardinal (Par... more ABSTRACT We evaluated the influence of microhabitat vegetation cover on Red-crested Cardinal (Paroaria coronata) nest survival in natural forests in central eastern Argentina by monitoring 106 nests for 1,262 exposure days. Daily nest survival rates increased with vegetation cover above the nest and decreased linearly as the breeding season progressed. Increased concealment above the nest helped hide and protect nests from predators (mainly aerial predators). Earlier nesting attempts in the breeding season were more successful than those later in the season. This is the first study to evaluate the effect of microhabitat vegetation cover on daily nest survival rates of a south temperate passerine. We highlight the importance of microhabitat nest concealment on nest success of the Red-crested Cardinal.

Research paper thumbnail of Nest survival rates of Red-crested Cardinals increase with nest age in south-temperate forests of Argentina

Journal of Field Ornithology, 2012

Research paper thumbnail of Cooperative harassment strategy by the European Starling to usurp cavities and reproductive cost for the neotropical Green-barred Woodpecker

Research paper thumbnail of Concerningly high breeding success rates for the European Starling after a recent invasion in the Neotropics

The European Starling is a highly invasive passerine that recently started to expand throughout S... more The European Starling is a highly invasive passerine that recently started to expand throughout South America. Despite its negative impacts on the native fauna, there are no reports of its breeding success, the population recruitment rate, or the factors affecting its nest success in these recently invaded natural habitats. In this study we monitored 100 European Starling nests in a native forest of central-eastern Argentina, during the 2020–2021 and 2021–2022 breeding seasons. We estimated the most common breeding parameters for the population (clutch size, number of fledglings, nest fate, nest survival) and measured nest-site features at different spatial scales to assess if they affected nest survival. Starlings used natural and woodpecker cavities, and nest initiation peak was in September. Successful nests produced ~ 3 fledglings and estimated nest success was 38%. Daily survival rates were negatively affected by nest-tree diameter at breast height. Nest survival was high compa...

Research paper thumbnail of The Impacts of Parasitic Flies (Philornis spp.) on Nestlings of Three Passerines in a Southern Temperate Forest of Argentina

Ardeola, 2021

Summary. Philornis flies exert strong negative selection on avian host life histories. However, t... more Summary. Philornis flies exert strong negative selection on avian host life histories. However, their possible influence at the southern limits of parasite distribution remains poorly studied. We collected data on Philornis parasitism (prevalence, parasite load and latency) during three consecutive breeding seasons of the Masked Gnatcatcher Polioptila dumicola, Vermilion Flycatcher Pyrocephalus rubinus and Blue-and-yellow Tanager Pipraeidea bonariensis in a south temperate forest in Argentina. We hypothesised that Philornis parasitism would negatively influence both the growth and survival of infected nestlings. Regarding body size differences among nestlings of these three host species, we predicted that nestling survival in parasitised nests and parasite load per nestling would be greater the larger the species, and that the number of growth parameters that differ between parasitised and non-parasitised nestlings would be greater the smaller the species. We monitored 564 nests and found prevalence to be 16.7% for the Masked Gnatcatcher, 30.1% for the Vermilion Flycatcher, and 37.9% for the Blue-and-yellow Tanager. Parasitism increased during the season for all three species. As predicted, for the three species, nestling survival was lower in parasitised nests (∼30%) than in non-parasitised nests (∼90%) and for each species, one or more growth parameters were significantly lower for parasitised nestlings compared to non-parasitised nestlings. Our prediction relating to host body size was partially supported since differences in parasite load only emerged in nests that produced fledglings, as well as in the extent of growth parameters affected. This is the first study providing detailed data of Philornis fly parasitism and how this parasite affects the fitness of three bird hosts at the southern limit of the parasite's distribution.—Gonzalez, E., Jauregui, A. & Segura, L.N. (2022). The impacts of parasitic flies (Philornis spp.) on nestlings of three passerines in a southern temperate forest of Argentina. Ardeola, 69: 3-20.

Research paper thumbnail of Unusual nest and nestling appropriation y the eared dove ( Zenaida auriculata )

Ornitologia Neotropical, 2016

∙ We report a case of interspecific nest appropriation by the Eared Dove ( Zenaida auriculata ) o... more ∙ We report a case of interspecific nest appropriation by the Eared Dove ( Zenaida auriculata ) on a nest of the Creamy‐bellied Thrush ( Turdus amaurochalinus ). The usurpation attempt resulted in the death of both nestlings, including a parasitic cowbird, despite forceful attempts by the thrushes to retake their nest and repeated attempts by the dove to feed the nestlings. We believe that the loss of the dove offspring from a nest in a neighboring tree could have triggered this behavior, which may be a hormonal byproduct caused by the recent loss of their own offspring, similar to what has been observed in Emperor Penguins ( Aptenodytes fosteri ). Resumen ∙ Inusual apropiacion de nido y pichones por parte de la Paloma Torcaza (Zenaida auriculata) Reportamos un caso de apropiacion interespecifica de nido en donde una Torcaza ( Zenaida auriculata ) usurpa el nido de un Zorzal Chalchalero ( Turdus amaurochalinus ). Ambos pichones, incluido un pichon parasito de cria, resultaron muerto...

Research paper thumbnail of Southernmost record of Yellow-headed Vulture, Cathartes burrovianus Cassin, 1845 (Cathartiformes, Cathartidae), in Buenos Aires province, Argentina

Check List, 2018

We report the southernmost record of Yellow-headed Vulture, Cathartes burrovianus, in Punta Piedr... more We report the southernmost record of Yellow-headed Vulture, Cathartes burrovianus, in Punta Piedras, north-eastern Buenos Aires province, Argentina. This record implies the presence of this species in a new habitat: the Pampas ecoregion. Considering this and other records in Argentina and Uruguay, the species distribution could be extending south from its known range.

Research paper thumbnail of A completely leucistic Rufous-bellied Thrush (Turdus rufiventris) breeding successfully in central-east Argentina

Revista Brasileira de Ornitologia, 2018

Color abnormalities are well known phenomena in birds, although most cases are not described in l... more Color abnormalities are well known phenomena in birds, although most cases are not described in literature (Gonçalvez-Jr. et al. 2008). Leucism produces individuals with white feathers, and this condition can either be partial or complete (totally white plumage), in which case it can be mistaken for albinism (a complete lack of melanin, including feathers, bill, legs and eyes) (van Grouw 2013). Adult leucistic birds are rarely found in the wild (Bensch et al. 2000), as they usually have a lower survival rate compared to normally colored individuals (Møller et al. 2013). These birds may suffer harassment by conspecifics and they can have deficiencies in how they reflect solar energy during early development stages (Slagsvold et al. 1988, Konter 2015). They are also prone to predation due to their conspicuousness (Santos 1981, Slagsvold et al. 1988, Gonçalvez-Jr. et al. 2008) and, since avian sexual selection is linked to coloration in most species (Hill 2006), their mating success is usually compromised (Truax & Siegel 1982). Besides visual perception of color, the lack of pigments also affects the structural properties of feathers (Bortolotti 2006). In this sense, Burtt-Jr. (1986) demonstrated that feathers containing melanin could resist abrasion for longer periods of time than white feathers, and Schreiber et al. (2006) reported an albino bird that could complete its nestling stage, but one year after fledging it was unable to fly due to a high degree of degradation in all its feathers. In this communication,

Research paper thumbnail of Breeding phenology and nest survival of Cinereous (Circus cinereus) and Long-winged (C. buffoni) Harriers in the agricultural landscapes of north-east Patagonia, Argentina

Emu - Austral Ornithology, 2017

We present novel data on breeding ecology and nest survival of the Cinereous (Circus cinereus) an... more We present novel data on breeding ecology and nest survival of the Cinereous (Circus cinereus) and Long-winged (C. buffoni) Harriers in modified grasslands of southern Argentina and we evaluate variations in daily nest survival rates (DSR) in relation to temporal and habitat variables. We studied three mixed nesting colonies embedded in agricultural landscapes along a road. We found that DSR decreased linearly with time of breeding and increased with vegetation height above the nest and the distance to the road. This is the first and most complete reproductive study concerning two species of conservation concern, namely the Cinereous and Long-winged Harriers in Patagonia. Our study provides valuable and novel insights into the population dynamics of these little-known species.

Research paper thumbnail of Nesting biology of the Narrow-billed Woodcreeper (Lepidocolaptes angustirostris) in a southern temperate forest of central-east Argentina

Studies on Neotropical Fauna and Environment, 2019

We present data on the nesting biology of the Narrow-billed Woodcreeper (Lepidocolaptes angustiro... more We present data on the nesting biology of the Narrow-billed Woodcreeper (Lepidocolaptes angustirostris) in a natural forest in central-east Argentina. A total of 18 nests were found during four breeding seasons (2015-2019; from September to January), located in cavities (natural, artificial and woodpecker cavities). The incubation period lasted 16 days and eggs were larger than those from northern populations. Nestlings stayed in the nest for 17 days and we could measure nestlings at two nests. Within the forest, nests were built in large native trees. Seven nests were successful, nine were depredated and two were abandoned. The average nest daily survival rate (DSR) was estimated as 0.96, giving a cumulative chance of nest survival in a nesting cycle of 24%. Our study provides the first estimate of the nest DSR for the species and new records on the nesting biology of a poorly known Neotropical bird.

Research paper thumbnail of Breeding Phenology and New Host List of the Black-Headed Duck (Heteronetta atricapilla) In Argentina

The Wilson Journal of Ornithology, 2017

Research paper thumbnail of Reproductive parameters of the Turquoise-fronted Parrot (Amazona aestiva) in the dry Chaco forest

Avian Conservation and Ecology, 2017

The progressive exploitation and destruction of nesting habitat in recent years, combined with th... more The progressive exploitation and destruction of nesting habitat in recent years, combined with the substantial pressure from legal and illegal removal of wild nestlings and adults, justifies the development of a comprehensive study on the reproductive biology of the Turquoise-fronted Parrot (Amazona aestiva). We analyzed breeding parameters in a wild protected population of Turquoise-fronted Parrots in the Chaco forest, Argentina, examining variation among years, over the course of the breeding season, and in relation to the age of the nest. Mean clutch-size per nesting attempt was 3.68 eggs. Hatching success (proportion of eggs laid that hatch) was 0.73. Fledging success (proportion of nestlings that fledge) was 0.88. The overall breeding success (mean number of fledglings per laying female per year) was 0.95. Clutch size did not vary among years but it decreased with the delay of the nest initiation date. Hatching failure was the greatest cause of egg partial losses, and brood reduction was the main cause of nestling partial loses. Brood reduction was positively correlated with clutch size and with egg-laying date. We did not find interannual variation in any of the clutch or brood size variables. Our results showed that the population of Turquoise-fronted Parrots in the dry Chaco forest has high values of clutch size and nestling survival, and low values of hatching success. However, some aspects of the breeding biology need more attention, especially if the species continues to be harvested. Paramètres de reproduction de l'Amazone à front bleu (Amazona aestiva) dans la forêt sèche du Chaco RÉSUMÉ. L'exploitation et la destruction progressives de l'habitat de nidification advenues ces récentes années, combinées à la pression élevée de captures légale et illégale d'oisillons et d'adultes sauvages, justifient la mise en place d'une étude globale sur la biologie de reproduction de l'Amazone à front bleu (Amazona aestiva). Nous avons analysé les paramètres de reproduction d'une population sauvage protégée de cette amazone dans la forêt du Chaco, en Argentine, examinant les variations interannuelles, tout au long de la saison de reproduction, en relation avec l'âge du nid. La taille moyenne de la ponte par tentative de nidification était de 3,68 oeufs. Le succès d'éclosion (proportion d'oeufs pondus qui ont éclos) était de 0,73. Le succès à l'envol (proportion de jeunes qui ont pris leur envol) était de 0,88. Le succès de nidification d'ensemble (nombre moyen de jeunes à l'envol par femelle nicheuse par année) était de 0,95. La taille de la ponte n'a pas varié d'une année à l'autre, mais était plus faible lorsque la date d'initiation du nid était retardée. L'échec de l'éclosion était la cause la plus importante de perte partielle d'oeufs et une couvée réduite était la cause principale de perte partielle d'oisillons. La couvée réduite était positivement corrélée avec la taille de la ponte et la date de celle-ci. Nous n'avons pas observé de variations interannuelles des variables relatives à la taille de la ponte ou de la couvée. Nos résultats indiquent que la population de l'Amazone à front bleu de la forêt sèche du Chaco montre des valeurs élevées de la taille de ponte et de la survie des oisillons, mais des valeurs faibles du succès d'éclosion. Néanmoins, nous pensons qu'il serait important de se pencher davantage sur certains éléments de la biologie de reproduction de l'espèce, particulièrement si elle continue d'être prélevée.

Research paper thumbnail of Genetic structure reveals management units for the yellow cardinal (Gubernatrix cristata), endangered by habitat loss and illegal trapping

Conservation Genetics, 2017

Research paper thumbnail of Nest Survival and Predation in Blue-Fronted ParrotsAmazona aestiva: Effects of Nesting Behaviour and Cavity Characteristics

Ardea, 2016

Nest survival is the result of a wide range of processes, including intra-and interspecific inter... more Nest survival is the result of a wide range of processes, including intra-and interspecific interactions (i.e. competition, parasitism and predation), parental condition and behaviour, and weather (Newton 1998, Lima 2009). Temporal patterns, such as the date at which the nesting attempt started (i.e. time of breeding) or the stage of the nesting cycle (i.e. nest age), often influence nest survival (

Research paper thumbnail of La distancia entre los parches de bosque y el tamaño de los árboles influyen en la abundancia del cardenal común (Paroaria coronata) en bosques naturales de Argentina

Research paper thumbnail of Nest survival of the Red-crested Cardinal (Paroaria coronata) in a modified habitat in Argentina / Supervivencia de nidos del Cardenal Común (Paroaria coronata) en un habitat modificado en Argentina

Ornitologia Neotropical, Dec 1, 2012

Nest survival of the Red-crested Cardinal (Paroaria coronata) in a modified habitat in Argentina.... more Nest survival of the Red-crested Cardinal (Paroaria coronata) in a modified habitat in Argentina.-Modification of nesting sites caused by human activity can have a negative effect on the reproductive success of birds. In recent decades, a population of Red-crested Cardinal (Paroaria coronata) was established in a modified forest with ecotourism intense activity. In this paper, we model the daily nest survival rate of this population of Red-crested Cardinal and we assessed the effect of time of season, age of nest and environmental variables. Between 2007 and 2009 we monitored 69 nests found in areas with different eco-tourist activity and we used the program MARK to estimate and model the daily survival rates. Only six nests produced fledglings and the main cause of nest failure was predation (88%). Nest survival increased with the vegetation cover around the nest and decreased with the date of the breeding season. We found no significant effect in nest survival of the activities related to ecotourism. The coverage around the nest could reduce their exposure by decreasing their detectability and hindering the access of predators, while the decrease in survival over the season could be the result of changes in the community of predators. The low nest survival associated with high rates of nest predation suggest that, in this study site, predator community could be being affected by human habitat alterations.

Research paper thumbnail of Red-crested Cardinals use color and width as cues to reject Shiny Cowbird eggs

The Auk, 2016

As part of the coevolutionary process between brood parasites and their hosts, the latter have de... more As part of the coevolutionary process between brood parasites and their hosts, the latter have developed different strategies to discriminate and reject parasitic eggs. This recognition-rejection process is the primary host defense against costly brood parasitism. The Red-crested Cardinal (Paroaria coronata) is an occasional host of the generalist Shiny Cowbird (Molothrus bonariensis) that successfully rejects all parasitic eggs. We studied the cues used by Redcrested Cardinals to recognize and reject foreign eggs by experimentally adding real parasite and host eggs painted as mimetic or nonmimetic of host eggs and analyzing whether eggshell coloration and/or shape were used as cues for egg rejection. Rejection rates, mostly through egg ejection, were high for all nonmimetic eggs (95% for unpainted cowbird eggs and 100% for painted nonmimetic cowbird and host eggs). On the contrary, they were low for mimetic host eggs (6% for unpainted host eggs and 20% for painted mimetic host eggs), but intermediate for painted mimetic cowbird eggs (55%). We also found that egg width significantly affected the probability of rejection, with wider parasitic eggs (i.e. more different from host eggs) more frequently rejected. We report for the first time that egg width is an important cue for recognition and ejection of cowbird eggs in an open-cup-nesting host. Our results show that coloration is a reliable cue used by Red-crested Cardinals to discriminate and reject parasitic eggs, but when coloration alone does not allow discrimination of foreign eggs, this host uses egg width as an additional cue.

Research paper thumbnail of Nest site selection by the Red-crested Cardinals (Paroaria coronata) in natural forest of Argentina / Selección de sitios de nidificación del Cardenal Común (Paroaria coronata) en bosques naturales de Argentina

ORNITOLOGIA NEOTROPICAL

The offspring survival in arboreal bird nests depends on tree species, size, surrounding vegetati... more The offspring survival in arboreal bird nests depends on tree species, size, surrounding vegetation, and the location of the nest in the tree crown. Both of the dominant tree species in the studied forest are used by for nest location. We studied the reproductive biology of the Red-crested Cardinal (Paroaria coronata) during the breeding season 2005–2006 in order to investigate relationships between nest frequencies and tree species, size and the location in the crown in two areas of natural temperate woodlands. Two tree species were used by the cardinal, Celtis tala and Scutia buxifolia, and each of them was found to be dominant at one study site. In each area, 25 nest trees and 25 random trees were identified. Nesting frequencies indicated a strong positive association with C. tala. However, nests on S. buxifolia were observed even in the C. tala dominated area, suggesting that a high population density induces cardinals to nest on less favoured tree species. Nesting trees were hi...

Research paper thumbnail of Nesting biology of the Red-crested Cardinal (Paroaria Coronata) in south temperate forests of central Argentina

The Wilson Journal of Ornithology, 2015

ABSTRACT Studies on breeding biology in Neotropical birds are crucial for understanding different... more ABSTRACT Studies on breeding biology in Neotropical birds are crucial for understanding different aspects of their life histories and also for their conservation. We describe the nesting biology of the Red-crested Cardinal (Paroaria coronata) in central Argentina, a common suboscine that inhabits south temperate forests. We monitored 367 nests from October to February 2005–2008. Nest initiation followed a unimodal distribution with a peak in November. Within the forest, no nests were built on exotic tree species. Mean clutch size was 3.05 ± 0.05 eggs and decreased with time within the breeding season; egg size did not vary across the breeding season. Nesting cycles lasted, on average, 25.8 ± 0.1 days (nest construction: 6.1 ± 0.4 days; incubation period: 11.9 ± 0.1 days; nestling period: 13.8 ± 0.1 days). At least one young fledged in 26% of nests, 62% were depredated, and 11% were abandoned. Egg survival rate was 0.95 ± 0.02, hatching success rate was 0.84 ± 0.02, and nestling survival rate was 0.81 ± 0.03. Partial nestling losses were detected in 45% of the nests, of which 52% were because of brood reduction. Each breeding pair had on average 4.4 ± 0.2 nesting attempts over the breeding season. Our results support the prediction that small clutch sizes are associated with extensive breeding seasons and several nesting attempts within a season. Except for the short incubation period, all other breeding features reported in this study differ from those of most north temperate birds and are consistent with the life history traits of Neotropical birds.

Research paper thumbnail of Supervivencia De Nidos Del Cardenal Común (Paroaria Coronata) en Un Habitat Modificado en Argentina

Nest survival of the Red-crested Cardinal (Paroaria coronata) in a modified habitat in Argentina.... more Nest survival of the Red-crested Cardinal (Paroaria coronata) in a modified habitat in Argentina.-Modification of nesting sites caused by human activity can have a negative effect on the reproductive success of birds. In recent decades, a population of Red-crested Cardinal (Paroaria coronata) was established in a modified forest with ecotourism intense activity. In this paper, we model the daily nest survival rate of this population of Red-crested Cardinal and we assessed the effect of time of season, age of nest and environmental variables. Between 2007 and 2009 we monitored 69 nests found in areas with different eco-tourist activity and we used the program MARK to estimate and model the daily survival rates. Only six nests produced fledglings and the main cause of nest failure was predation (88%). Nest survival increased with the vegetation cover around the nest and decreased with the date of the breeding season. We found no significant effect in nest survival of the activities related to ecotourism. The coverage around the nest could reduce their exposure by decreasing their detectability and hindering the access of predators, while the decrease in survival over the season could be the result of changes in the community of predators. The low nest survival associated with high rates of nest predation suggest that, in this study site, predator community could be being affected by human habitat alterations. Resumen.-La modificación de los sitios de nidificación causada por la actividad humana puede tener un efecto negativo sobre el éxito reproductivo de las aves. En las últimas décadas, una población de Cardenal Común (Paroaria coronata) se estableció en un bosque modificado con una intensa actividad de ecoturismo. En este trabajo modelamos la tasa diaria de supervivencia de nidos (TDSN) de esta población de cardenales y evaluamos el efecto de variables ambientales y temporales en la TDSN. Entre 2007 y 2009 monitoreamos 69 nidos encontrados en áreas con distinta actividad eco-turística y usamos el Programa MARK para estimar y modelar las TDSNs. Sólo seis nidos (9%) produjeron volantones y la principal causa de fracaso fue la depredación (61 nidos, 88%). La TDSN aumentó con la cobertura de vegetación en los alrededores del nido y disminuyó con la fecha de la temporada reproductiva. No encontramos un efecto significativo en las TDSNs de las actividades vinculadas al ecoturismo. La mayor cobertura alrededor del nido podría reducir su exposición disminuyendo su detectabilidad y dificultando el acceso de los depredadores, mientras que la disminución de la supervivencia a lo largo de la temporada podría ser el resultado de variaciones numéricas en la comunidad de depredadores. Los bajos valores de TDSNs del cardenal asociados a elevadas tasas de depredación sugieren que la comunidad de depredadores podría estar siendo afectada por la cercanía a los grandes centros urbanos. Aceptado el 5 de diciembre de 2012.

Research paper thumbnail of Microhabitat Nest Cover Effect on Nest Survival of the Red-Crested Cardinal

The Wilson Journal of Ornithology, 2012

ABSTRACT We evaluated the influence of microhabitat vegetation cover on Red-crested Cardinal (Par... more ABSTRACT We evaluated the influence of microhabitat vegetation cover on Red-crested Cardinal (Paroaria coronata) nest survival in natural forests in central eastern Argentina by monitoring 106 nests for 1,262 exposure days. Daily nest survival rates increased with vegetation cover above the nest and decreased linearly as the breeding season progressed. Increased concealment above the nest helped hide and protect nests from predators (mainly aerial predators). Earlier nesting attempts in the breeding season were more successful than those later in the season. This is the first study to evaluate the effect of microhabitat vegetation cover on daily nest survival rates of a south temperate passerine. We highlight the importance of microhabitat nest concealment on nest success of the Red-crested Cardinal.

Research paper thumbnail of Nest survival rates of Red-crested Cardinals increase with nest age in south-temperate forests of Argentina

Journal of Field Ornithology, 2012

Research paper thumbnail of LOS TALARES BONAERENSES COMO RECURSO NATURAL

Este libro surge en el marco de actividades de Extensión Universitaria llevadas a cabo en escuela... more Este libro surge en el marco de actividades de Extensión Universitaria llevadas a cabo en escuelas rurales del partido de Punta Indio, provincia de Buenos Aires. Los principales destinatarios son alumnos que conviven a diario con los recursos naturales de la zona. Los bosques (denominados Talares) representan una de las pocas masas forestales nativas de la provincia y atraviesan en la actualidad serios problemas de conservación por el impacto de la actividad del hombre (principalmente extracción de conchilla y madera). Esta problemática nos llevó a visitar las escuelas con el objetivo de crear conciencia sobre este ambiente y lo importante que es conservarlo. Las nuevas generaciones juegan un rol fundamental en este proceso de concientización, por eso nuestro propósito es lograr que reconozcan estos ambientes como un recurso natural valioso y que se involucren activamente en su conservación.