Fish composition and species richness in eastern South American coastal lagoons: additional support for the freshwater ecoregions of the world.
Fish composition and species richness in eastern South American coastal lagoons: additional support for the freshwater ecoregions of the world.
复制标题
南美东部沿海泻湖的鱼类组成和物种丰富度：对世界淡水生态区的额外支持。
作者：
A. Petry;T. Guimarães;F. Vasconcellos;S. Hartz;F. Becker;Ricardo S. Rosa;G. Goyenola;Érica Maria Pellegrini Caramaschi;J. Astarloa;L. M. Sarmento;J. Vieira;Alexandre M. Garcia;F. T. Mello;F. A. G. D. Melo;M. Meerhoff;J. L. Attayde;R. Menezes;N. Mazzeo;F. D. Dario
对2.83 ° S ~ 37.64 ° S之间9个淡水生态区（FEOW）103个泻湖的鱼类组成、连通性和形态计量学之间的关系进行了评价，以探讨物种丰富度梯度与组合组成相似性之间的可能一致性。研究中包括的大多数泻湖面积小于2平方公里，最大表面积为3975平方公里。研究中包括的所有泻湖的总表面积为5411 km（2）。物种数从1种到76种不等。多元回归分析表明，纬度，属性的形态和连通性，和采样努力解释了大量的物种丰富度的变化。泻湖面积是一个很好的预测物种丰富度，但在低纬度生态区，泻湖通常是小型的，不受海洋移民，非本地鱼类物种占物种丰富度的重要部分。小型泻湖（<2 km（2））中物种和面积之间的关系与每个生态区的预期数量高度相似，位于18·27° S和30·15° S之间的系统获得了较高的物种丰富度。在初级，次级和外围或海洋部门的物种组成的相似性，揭示了强大的大陆海洋地理模式，只为不耐盐或不耐盐的物种。因此，为南美洲东部边界的FEOW计划提供了进一步的支持，现在包括同时居住着淡水和海洋鱼类的生态带系统。
The relationships between fish composition, connectivity and morphometry of 103 lagoons in nine freshwater ecoregions (FEOW) between 2·83° S and 37·64° S were evaluated in order to detect possible congruence between the gradient of species richness and similarities of assemblage composition. Most lagoons included in the study were <2 km(2) , with a maximum of 3975 km(2) in surface area. Combined surface area of all lagoons included in the study was 5411 km(2) . Number of species varied locally from one to 76. A multiple regression revealed that latitude, attributes of morphometry and connectivity, and sampling effort explained a large amount of variability in species richness. Lagoon area was a good predictor of species richness except in low latitude ecoregions, where lagoons are typically small-sized and not affected by marine immigrants, and where non-native fish species accounted for a significant portion of species richness. Relationships between species and area in small-sized lagoons (<2 km(2) ) is highly similar to the expected number in each ecoregion, with systems located between 18·27° S and 30·15° S attaining higher levels of species richness. Similarities in species composition within the primary, secondary and peripheral or marine divisions revealed strong continental biogeographic patterns only for species less tolerant or intolerant to salinity. Further support for the FEOW scheme in the eastern border of South America is therefore provided, and now includes ecotonal systems inhabited simultaneously by freshwater and marine species of fishes.