Maragno Franciéle P, Santos Tiago G, Cechin Sonia Z
Programa de Pós-Graduação em Biodiversidade Animal, Universidade Federal de Santa Maria, 97105-900 Santa Maria RS, Brasil.
An Acad Bras Cienc. 2013 Sep;85(3):1105-16. doi: 10.1590/S0001-37652013005000042. Epub 2013 Jul 30.
Considering that habitat use by amphibians is related both with climate and environmental features, we tested the hypothesis that anuran assemblages found in different phytophysiognomies and in different seasons vary in structure. Additionally, we searched for species which can be indicators of habitat and seasons. The study was conducted in the Pampa biome, southern Brazil. Sampling was done through pitfall traps placed in three phytophysiognomies: grassland, ecotone grassland/forest; and forest. The seasonality factor was created by grouping months in warn and cold seasons. Sixteen species were found and the assemblages were influenced both by phytophysiognomies and climatic seasonality. In a paired comparison, the three phytophysiognomies differed in structure of assemblage from each other. Physalaemus henselii, P. riograndensis, Pseudopaludicola falcipes and Pseudis minuta were indicators of ecotone. Leptodactylus gracilis and Physalaemus biligonigerus were indicators of grassland. None species was indicator of forest. Most of the species were indicators of warm season: Elachistocleis bicolor, Leptodactylus fuscus, L. gracilis, L. latinasus, L. latrans, L. mystacinus, Physalaemus biligonigerus, P. cuvieri and Pseudis minuta. None species was indicator of cold season. We found that even for species of open areas, as Pampa, heterogeneous phytophysiognomies are important for maintaining abundance and constancy of populations of anuran.
考虑到两栖动物的栖息地利用与气候和环境特征都有关系，我们检验了这样一个假设：在不同植物群落类型和不同季节发现的无尾目动物组合在结构上存在差异。此外，我们寻找了可作为栖息地和季节指示物种的物种。该研究在巴西南部的潘帕生物群落进行。通过放置在三种植物群落类型中的陷阱进行采样：草原、草原/森林交错带和森林。季节性因素是通过将月份分为温暖季节和寒冷季节来创建的。共发现16个物种，这些组合受到植物群落类型和气候季节性的影响。在配对比较中，三种植物群落类型的组合结构彼此不同。亨氏蟾蜍、里奥格兰德蟾蜍、镰足伪姬蛙和小伪蛙是交错带的指示物种。细趾蟾和双斑蟾蜍是草原的指示物种。没有物种是森林的指示物种。大多数物种是温暖季节的指示物种：双色弹蛙、棕褐细趾蟾、细趾蟾、宽趾细趾蟾、大斑细趾蟾、须细趾蟾、双斑蟾蜍、库氏蟾蜍和小伪蛙。没有物种是寒冷季节的指示物种。我们发现，即使对于潘帕这样的开阔地区物种来说，异质的植物群落类型对于维持无尾目动物种群的数量和稳定性也很重要。
