ANURANS FROM BARRA DE LA LAGUNA DE ROCHA (original) (raw)
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Anurans from Barra De La Laguna De Rocha (Rocha, Uruguay)
Revista Latinoamericana de Herpetología, 2019
We present a list of amphibian species from the protected area Barra de la Laguna de Rocha (BLR), Uruguay. Fifteen monthly three-day field trips were performed between September 2011 and March 2013. During each field trip, active searches of individuals and auditive samplings were performed at seven selected sites. We recorded 19 species of amphibians belonging to five families: Bufonidae (4 especies), Hylidae (5), Leptodactylidae (7), Microhylidae (1) y Odontophrynidae (2). Comparing these data with historical records (obtained from cientific collections and literature), eight species represented new records for the study site. The species richness in the area represents 39.6% of the total richness recorded for Uruguay. We highlight the presence of Melanophryniscus montevidensis (Philippi 1902), a locally and globally threatened species. Information on BLR's amphibian species composition could help in the implementation of the management plan for this conservation unit, as well...
Check List, 2015
Cerro Verde Protected Area, on the coast of Uruguay, serves mainly to protect the marine fauna, which has charismatic species including marine turtles and dolphins. However, the terrestrial portion of this area has the conditions for hosting a great diversity of amphibians. The aims of this study were to build the inventory of amphibians from Cerro Verde, to assess its completeness and to compare it with the inventory constructed from historical records. Acoustic surveys were conducted monthly from 2007 to 2009 at 16 water bodies of the area. Nineteen species were found during this sampling period; the accumulation curve of richness showed an asymptotic pattern, indicating the completeness of the inventory. However, species previously collected in the area were not found during this study, suggesting a loss of diversity in the last decades.
Check List, 2015
Cerro Verde Protected Area, on the coast of Uruguay, serves mainly to protect the marine fauna, which has charismatic species including marine turtles and dolphins. However, the terrestrial portion of this area has the conditions for hosting a great diversity of amphibians. The aims of this study were to build the inventory of amphibians from Cerro Verde, to assess its completeness and to compare it with the inventory constructed from historical records. Acoustic surveys were conducted monthly from 2007 to 2009 at 16 water bodies of the area. Nineteen species were found during this sampling period; the accumulation curve of richness showed an asymptotic pattern, indicating the completeness of the inventory. However, species previously collected in the area were not found during this study, suggesting a loss of diversity in the last decades.
2008
The border region between Uruguay and the Brazilian state of Rio Grande do Sul comprises four major biomes, i. e. the coastal dune zone, adjacent wetlands, low hill ranges (cuchillas), and grassland (pampas). All these environments provide different microhabitats for amphibians, such as continental lagoons, rivers, small streams, ponds and temporary water bodies. This habitat diversity is reflected by high species diversity, but the amphibian fauna in this region is yet poorly studied. Recent fieldwork revealed several new records for anurans, including a recently described species of toad, Chaunus achavali. In our publication we provide an updated check list of the species belonging to the family Bufonidae (toads) occurring in this region, including taxonomical comments, conservation issues, natural history notes, zoogeographical considerations and an updated bibliography. A total amount of 13 species of Bufonidae is known from the study area belonging to the genera Chaunus (formerly Bufo) and Melanophryniscus. Chaunus is represented by seven species in three taxonomic groups (C. marinus, C. granulosus and C. crucifer groups), whereas Melanophryniscus is represented by six species in three groups (M. stelzneri, M. moreirae and M. tumifrons groups). We present a key for the identification of these bufonid species in the study region. Based on geographical distribution patterns of the species involved, we distinguish five main ecological groups: coastal species inhabiting sandy soil layers (Chaunus arenarum and Melanophryniscus montevidensis); species shared with the Argentinean mesopotamic region (Chaunus granulosus group); species characteristic for the chacoan region (Chaunus schneideri); species associated with the low hill regions of Uruguay and southern Rio Grande do Sul (most taxa belonging to Melanophryniscus); two species of Chaunus (C. ictericus, C. henseli) are associated with the Atlantic forest biome further to the north being untypical for the border region.
Stuttgarter …, 2008
A b s t r a c t The border region between Uruguay and the Brazilian state of Rio Grande do Sul comprises four major biomes, i. e. the coastal dune zone, adjacent wetlands, low hill ranges (cuchillas), and grassland (pampas). All these environments provide different microhabitats for amphibians, such as continental lagoons, rivers, small streams, ponds and temporary water bodies. This habitat diversity is reflected by high species diversity, but the amphibian fauna in this region is yet poorly studied. Recent fieldwork revealed several new records for anurans, including a recently described species of toad, Chaunus achavali. In our publication we provide an updated check list of the species belonging to the family Bufonidae (toads) occurring in this region, including taxonomical comments, conservation issues, natural history notes, zoogeographical considerations and an updated bibliography. A total amount of 13 species of Bufonidae is known from the study area belonging to the genera Chaunus (formerly Bufo) and Melanophryniscus. Chaunus is represented by seven species in three taxonomic groups (C. marinus, C. granulosus and C. crucifer groups), whereas Melanophryniscus is represented by six species in three groups (M. stelzneri, M. moreirae and M. tumifrons groups). We present a key for the identification of these bufonid species in the study region. Based on geographical distribution patterns of the species involved, we distinguish five main ecological groups: coastal species inhabiting sandy soil layers (Chaunus arenarum and Melanophryniscus montevidensis); species shared with the Argentinean mesopotamic region (Chaunus granulosus group); species characteristic for the chacoan region (Chaunus schneideri); species associated with the low hill regions of Uruguay and southern Rio Grande do Sul (most taxa belonging to Melanophryniscus); two species of Chaunus (C. ictericus, C. henseli) are associated with the Atlantic forest biome further to the north being untypical for the border region.
Amphibian diversity of Uruguay: Background knowledge, inventory completeness and sampling coverage
2010
The aim of this work is to update the scientific knowledge of Uruguayan amphibians. We address the trends of studies since the beginning of the 19 th century until today, describing the transition from descriptive studies focused on natural history to modern evolutionary and ecological perspectives. In order to assess the inventory completeness of the Uruguayan amphibians, we compiled 13,711 records from the main scientific collections in the country. Geographic distributions were derived from georeferenced records overlaid on a grid of 302 quadrants. We generated a cumulative species curve (quadrants as sampling units), which showed an asymptotic pattern with a maximum estimated value of 48 species (95%-confidence interval: 46-60), very close to the actual number of known species (50 species). The upper bound of the confidence interval reaches 60 species suggesting that 14 species could still remain unknown in the worst scenario. The data are heterogeneously distributed across the country: 43% of quadrants have no information, 50% are sub-sampled, and only 8% can be considered as well known. The extent of information gaps seriously challenges assessments of geographic distributions of the amphibian diversity at the quadrant resolution scale. Only the coastline borders of the Río de la Plata, the Atlantic coast, regions in the northern basaltic hills, and in the northwestern littoral zone, are relatively well known at this scale. We conclude that important sampling effort, mainly in the detected geographic information gaps, is needed to complete our knowledge about Uruguayan amphibian diversity.
Journal of Threatened Taxa, 2019
We present an assessment on composition, diversity and structure of amphibians in three zones along an elevation gradient (2,400–3,000 m) in the Central Cordillera of Colombia. For this purpose, we carried out two field trips in November 2014 and February 2015, covering rainy and dry seasons, respectively. Diurnal (08:00–12:00 h) and nocturnal (18:00–22:00 h) visual encounter surveys were made without spatial restrictions. The diversity for each zone (alpha) and for the entire landscape (gamma) was evaluated by the effective number of species, and the structure of the communities was analyzed by range-abundance curves. The inequality factor for each of the sampling zones was also calculated. A total of 15 species belonging to seven genera and three families were recorded, all of the order Anura. Craugastoridae with 11 species (73.3% of richness) and Pristimantis (eight species) were the most diverse family and genus, respectively. The average alpha diversity per zone was 6.6 effective species, with zone A being the most diverse with eight species. In terms of beta diversity we found 2.5 effective communities at the landscape level, and differences between zones are given by the rare species, while the most abundant ones (e.g., Pristimantis uranobates) are shared between them. It is presumed that the greater diversity of zone A is due to the lower elevation and better state of conservation if compared to the other two zones. Of the total species recorded, three are threatened with extinction: Endangered (Hypodactylus latens, Osornophryne percrassa), and Critically Endangered (Niceforonia adenobrachia). The finding of three yet undescribed species is highlighted.