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首页> 外文期刊>Canadian Journal of Zoology >Habitat heterogeneity and climatic seasonality structure the avifauna trophic guilds in the Brazilian Pantanal wetland.
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Habitat heterogeneity and climatic seasonality structure the avifauna trophic guilds in the Brazilian Pantanal wetland.

机译：栖息地的异质性和气候的季节性结构构成了巴西潘塔纳尔湿地的鸟类营养协会。

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摘要

Landscape heterogeneity and annual flood pulses characterize the Brazilian Pantanal, the largest floodplain in South America. The objective of this work was to explain spatial and temporal variations in the trophic structure of a bird assemblage consisting of 316 species of terrestrial and aquatic birds, out of which 88 are visitors. The food items potentially consumed by these species were combined into 12 trophic guilds and were compared based on habitats (terrestrial or aquatic), periods of the year, and visitor or resident species. Nonmetric multidimensional scaling was used to determine which trophic guilds characterize the different habitats and months. The habitats were separated into a gradient of trophic guild similarity ranging from woodlands to purely aquatic, with swamps and floodable fields in intermediate positions. Species that consume invertebrates and plants predominate in the terrestrial habitats, whereas the consumption of terrestrial and (or) aquatic invertebrates, vertebrates, and plants predominate in the aquatic habitats. The monthly similarities in trophic structure vary with rainfall, and the period of receding waters is characterized by an increase in the number of species in guilds that consume nectar, invertebrates, vertebrates, and (or) plant parts obtained or captured in the drying landscape and terrestrial habitats. Visitor species do not exploit new resource types; instead they accommodate themselves in the pre-existing trophic guilds.Digital Object Identifier http://dx.doi.org/10.1139/z11-099
机译：景观异质性和年度洪水脉动是巴西潘塔纳尔湿地的特征，后者是南美最大的洪泛区。这项工作的目的是解释由316种陆生和水生鸟类组成的鸟类集合的营养结构的时空变化，其中有88种是访客。这些物种可能消耗的食品被组合成12个营养协会，并根据栖息地（陆生或水生），一年中的时期以及来访者或常住物种进行了比较。使用非度量多维标度确定哪些营养行会表征不同的栖息地和月份。这些栖息地被分为从森林地到纯水生植物的营养协会相似性梯度，中间有沼泽和可洪区。消耗无脊椎动物和植物的物种在陆地生境中占主导地位，而陆地和（或）水生无脊椎动物，脊椎动物和植物的消耗在水生生境中占主导地位。营养结构的每月相似性随降雨而变化，退潮时期的特征是行会中的物种数量增加，这些物种消耗在干燥的地形中获得或捕获的花蜜，无脊椎动物，脊椎动物和（或）植物部分。陆地栖息地。访客物种不会开发新的资源类型;相反，它们将自己容纳在预先存在的营养行业中。数字对象标识符http://dx.doi.org/10.1139/z11-099

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