Juan M Barreneche | Universidad de la República (original) (raw)
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Papers by Juan M Barreneche
invasores. Callosciurus erythraeus debido a la expansión de sus rangos de distribución en países ... more invasores. Callosciurus erythraeus debido a la expansión de sus rangos de distribución en países vecinos y Mustela vison debido a que la especie está siendo activamente introducida con fines productivos en varios puntos del país. A pesar de que Uruguay es un país pequeño, con poca variación geográfica o climática, las estimaciones de Maxent de establecimiento potencial para especies exóticas, predice variaciones importantes y significativas a lo largo del territorio y entre especies. Estas hipótesis climáticas representan una valiosa estimación del estatus actual o potencial de especies invasoras con fines de manejo. Asimismo realizamos comparaciones de atributos como el tamaño corporal y la dieta de las especies nativas, introducidas y recientemente extintas, evaluando el cambio en la composición del ensamble de mamíferos que está teniendo lugar en el país. Las especies extintas en épocas históricas, eran significativamente mayores que las introducidas y eran principalmente carnívo...
Zootaxa, 2008
The genus Pseudopaludicola consists of 12 Neotropical species, whose biology is not well known. O... more The genus Pseudopaludicola consists of 12 Neotropical species, whose biology is not well known. Only four larvae of this genus have been described. The first one to be described was P. falcipes, but available reports are incomplete and the morphology description is inconsistent, especially in oral disc configuration. P. falcipes was posteriorly re-described based only on adult specimens, and its geographic distribution was restricted. Therefore, there is a need to examine tadpole morphology of this genus in order to provide a new larval description. In this paper we re-describe the tadpole of P. falcipes and compare it with other species of the genus Pseudopaludicola. Our description is based on specimens collected at three different localities in northern Uruguay, with series reared in the laboratory. We report a novel oral disc configuration: the uniserial marginal papillae present a wide upper gap and a narrow lower gap followed by two lateral gaps. We also analyze the previously ignored oral disc diversity among Leiuperidae larvae, which must be taken into account in comparisons between species for systematic purposes and ecological studies. Morphometric comparisons with P. boliviana tadpole reveal that P. falcipes is larger, having a narrower and shorter snout, and a greater narial-ocular distance. P. falcipes larvae belong to the lentic bentonic ecomorphological guild.
invasores. Callosciurus erythraeus debido a la expansión de sus rangos de distribución en países ... more invasores. Callosciurus erythraeus debido a la expansión de sus rangos de distribución en países vecinos y Mustela vison debido a que la especie está siendo activamente introducida con fines productivos en varios puntos del país. A pesar de que Uruguay es un país pequeño, con poca variación geográfica o climática, las estimaciones de Maxent de establecimiento potencial para especies exóticas, predice variaciones importantes y significativas a lo largo del territorio y entre especies. Estas hipótesis climáticas representan una valiosa estimación del estatus actual o potencial de especies invasoras con fines de manejo. Asimismo realizamos comparaciones de atributos como el tamaño corporal y la dieta de las especies nativas, introducidas y recientemente extintas, evaluando el cambio en la composición del ensamble de mamíferos que está teniendo lugar en el país. Las especies extintas en épocas históricas, eran significativamente mayores que las introducidas y eran principalmente carnívo...
Ecography, 2013
ABSTRACT A common property of landscapes and metacommunities is the occurrence of abrupt shifts i... more ABSTRACT A common property of landscapes and metacommunities is the occurrence of abrupt shifts in connectivity along gradients of individual dispersal abilities. Animals with short-range dispersal capability perceive fragmented landscapes, but organisms moving across critical thresholds perceive continuous landscapes. This qualitative shift in landscape perception may determine several attributes of local communities and the dynamics of whole metacommunities. Modularity describes the existence in some communities of relatively high numbers of mutual connections favoring the movement of neighboring individuals (even when each individual is able to reach any patch in the landscape). Local patch linkages and metacommunity connectivity along gradients of dispersal ability have been reported frequently. However, the intermediate level of structure captured by modularity has not been considered. We evaluated landscape connectivity and modularity along gradients of individual dispersal abilities. Random landscapes with different degrees of cell aggregation and occupancy were simulated; we also analyzed ten real ecosystems. An expected, a shift in landscape connectivity was always detected; modularity consistently decreased gradually along dispersal gradients in both simulated networks and empirical landscapes. Neutral metacommunities within simulated landscapes demonstrated that modularity and connectivity may reflect landscape traits in the shaping of metacommunity diversity. Average beta-diversity was strongly associated with modularity, particularly with low migration rates, while connectivity trends tracked changes in beta-diversity at intermediate to high migrations rates. Consequently, while some species are able to perceive abrupt transitions in the landscape, many others probably experience a gradual continuum in landscape perception, contrary to predictions from previous analyses. Furthermore, the gradual behavior of modularity indicates that it may represent an exceptional early-warning tool that measures system distance to tipping points. Our study highlights the multiple perceptions that different species may have of a single landscape and shows, for the first time, a theoretical and empirical relationship between landscape modularity, and metacommunity diversity.
The genus Pseudopaludicola consists of 12 Neotropical species, whose biology is not well known. O... more The genus Pseudopaludicola consists of 12 Neotropical species, whose biology is not well known. Only four larvae of this genus have been described. The first one to be described was P. falcipes, but available reports are incomplete and the morphology description is inconsistent, especially in oral disc configuration. P. falcipes was posteriorly re-described based only on adult specimens, and its geographic distribution was restricted. Therefore, there is a need to examine tadpole morphology of this genus in order to provide a new larval description. In this paper we re-describe the tadpole of P. falcipes and compare it with other species of the genus Pseudopaludicola. Our description is based on specimens collected at three different localities in northern Uruguay, with series reared in the laboratory. We report a novel oral disc configuration: the uniserial marginal papillae present a wide upper gap and a narrow lower gap followed by two lateral gaps. We also analyze the previously ignored oral disc diversity among Leiuperidae larvae, which must be taken into account in comparisons between species for systematic purposes and ecological studies. Morphometric comparisons with P. boliviana tadpole reveal that P. falcipes is larger, having a narrower and shorter snout, and a greater narial-ocular distance. P. falcipes larvae belong to the lentic bentonic ecomorphological guild.
Biota Neotropica, 2009
Scinax aromothyella is a recently described hylid frog. Its distribution is not well known. There... more Scinax aromothyella is a recently described hylid frog. Its distribution is not well known. There are records for Misiones, Argentina and for southeastern Uruguay. Here we report a new record of S. aromothyella from Aceguá, Cerro Largo Department, Uruguay (31° 53' 39" S and 54° 9' 17" W), based in tadpoles collected on the 15 of August, 2007. This new record extends the distribution of S. aromothyella in approximately 100 km north from previous reports in Uruguay. The samples were collected in a site located 2 km away from the border line with Brazil, reinforcing the idea that S. aromothyella might occur in Rio Grande do Sul.
Advances in Ecological Research, 2011
invasores. Callosciurus erythraeus debido a la expansión de sus rangos de distribución en países ... more invasores. Callosciurus erythraeus debido a la expansión de sus rangos de distribución en países vecinos y Mustela vison debido a que la especie está siendo activamente introducida con fines productivos en varios puntos del país. A pesar de que Uruguay es un país pequeño, con poca variación geográfica o climática, las estimaciones de Maxent de establecimiento potencial para especies exóticas, predice variaciones importantes y significativas a lo largo del territorio y entre especies. Estas hipótesis climáticas representan una valiosa estimación del estatus actual o potencial de especies invasoras con fines de manejo. Asimismo realizamos comparaciones de atributos como el tamaño corporal y la dieta de las especies nativas, introducidas y recientemente extintas, evaluando el cambio en la composición del ensamble de mamíferos que está teniendo lugar en el país. Las especies extintas en épocas históricas, eran significativamente mayores que las introducidas y eran principalmente carnívo...
Zootaxa, 2008
The genus Pseudopaludicola consists of 12 Neotropical species, whose biology is not well known. O... more The genus Pseudopaludicola consists of 12 Neotropical species, whose biology is not well known. Only four larvae of this genus have been described. The first one to be described was P. falcipes, but available reports are incomplete and the morphology description is inconsistent, especially in oral disc configuration. P. falcipes was posteriorly re-described based only on adult specimens, and its geographic distribution was restricted. Therefore, there is a need to examine tadpole morphology of this genus in order to provide a new larval description. In this paper we re-describe the tadpole of P. falcipes and compare it with other species of the genus Pseudopaludicola. Our description is based on specimens collected at three different localities in northern Uruguay, with series reared in the laboratory. We report a novel oral disc configuration: the uniserial marginal papillae present a wide upper gap and a narrow lower gap followed by two lateral gaps. We also analyze the previously ignored oral disc diversity among Leiuperidae larvae, which must be taken into account in comparisons between species for systematic purposes and ecological studies. Morphometric comparisons with P. boliviana tadpole reveal that P. falcipes is larger, having a narrower and shorter snout, and a greater narial-ocular distance. P. falcipes larvae belong to the lentic bentonic ecomorphological guild.
invasores. Callosciurus erythraeus debido a la expansión de sus rangos de distribución en países ... more invasores. Callosciurus erythraeus debido a la expansión de sus rangos de distribución en países vecinos y Mustela vison debido a que la especie está siendo activamente introducida con fines productivos en varios puntos del país. A pesar de que Uruguay es un país pequeño, con poca variación geográfica o climática, las estimaciones de Maxent de establecimiento potencial para especies exóticas, predice variaciones importantes y significativas a lo largo del territorio y entre especies. Estas hipótesis climáticas representan una valiosa estimación del estatus actual o potencial de especies invasoras con fines de manejo. Asimismo realizamos comparaciones de atributos como el tamaño corporal y la dieta de las especies nativas, introducidas y recientemente extintas, evaluando el cambio en la composición del ensamble de mamíferos que está teniendo lugar en el país. Las especies extintas en épocas históricas, eran significativamente mayores que las introducidas y eran principalmente carnívo...
Ecography, 2013
ABSTRACT A common property of landscapes and metacommunities is the occurrence of abrupt shifts i... more ABSTRACT A common property of landscapes and metacommunities is the occurrence of abrupt shifts in connectivity along gradients of individual dispersal abilities. Animals with short-range dispersal capability perceive fragmented landscapes, but organisms moving across critical thresholds perceive continuous landscapes. This qualitative shift in landscape perception may determine several attributes of local communities and the dynamics of whole metacommunities. Modularity describes the existence in some communities of relatively high numbers of mutual connections favoring the movement of neighboring individuals (even when each individual is able to reach any patch in the landscape). Local patch linkages and metacommunity connectivity along gradients of dispersal ability have been reported frequently. However, the intermediate level of structure captured by modularity has not been considered. We evaluated landscape connectivity and modularity along gradients of individual dispersal abilities. Random landscapes with different degrees of cell aggregation and occupancy were simulated; we also analyzed ten real ecosystems. An expected, a shift in landscape connectivity was always detected; modularity consistently decreased gradually along dispersal gradients in both simulated networks and empirical landscapes. Neutral metacommunities within simulated landscapes demonstrated that modularity and connectivity may reflect landscape traits in the shaping of metacommunity diversity. Average beta-diversity was strongly associated with modularity, particularly with low migration rates, while connectivity trends tracked changes in beta-diversity at intermediate to high migrations rates. Consequently, while some species are able to perceive abrupt transitions in the landscape, many others probably experience a gradual continuum in landscape perception, contrary to predictions from previous analyses. Furthermore, the gradual behavior of modularity indicates that it may represent an exceptional early-warning tool that measures system distance to tipping points. Our study highlights the multiple perceptions that different species may have of a single landscape and shows, for the first time, a theoretical and empirical relationship between landscape modularity, and metacommunity diversity.
The genus Pseudopaludicola consists of 12 Neotropical species, whose biology is not well known. O... more The genus Pseudopaludicola consists of 12 Neotropical species, whose biology is not well known. Only four larvae of this genus have been described. The first one to be described was P. falcipes, but available reports are incomplete and the morphology description is inconsistent, especially in oral disc configuration. P. falcipes was posteriorly re-described based only on adult specimens, and its geographic distribution was restricted. Therefore, there is a need to examine tadpole morphology of this genus in order to provide a new larval description. In this paper we re-describe the tadpole of P. falcipes and compare it with other species of the genus Pseudopaludicola. Our description is based on specimens collected at three different localities in northern Uruguay, with series reared in the laboratory. We report a novel oral disc configuration: the uniserial marginal papillae present a wide upper gap and a narrow lower gap followed by two lateral gaps. We also analyze the previously ignored oral disc diversity among Leiuperidae larvae, which must be taken into account in comparisons between species for systematic purposes and ecological studies. Morphometric comparisons with P. boliviana tadpole reveal that P. falcipes is larger, having a narrower and shorter snout, and a greater narial-ocular distance. P. falcipes larvae belong to the lentic bentonic ecomorphological guild.
Biota Neotropica, 2009
Scinax aromothyella is a recently described hylid frog. Its distribution is not well known. There... more Scinax aromothyella is a recently described hylid frog. Its distribution is not well known. There are records for Misiones, Argentina and for southeastern Uruguay. Here we report a new record of S. aromothyella from Aceguá, Cerro Largo Department, Uruguay (31° 53' 39" S and 54° 9' 17" W), based in tadpoles collected on the 15 of August, 2007. This new record extends the distribution of S. aromothyella in approximately 100 km north from previous reports in Uruguay. The samples were collected in a site located 2 km away from the border line with Brazil, reinforcing the idea that S. aromothyella might occur in Rio Grande do Sul.
Advances in Ecological Research, 2011