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Fish assemblages respond to forest cover in small Amazonian basins
Limnologica ( IF 1.7 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.limno.2020.125757
Igor David da Costa , Ana Cristina Petry , Rosana Mazzoni

Abstract The removal of native forest affects stream characteristics, processes, and organisms at the local scale. We compared the structure of fish assemblages between microbasins impacted by deforestation and those in pristine condition in the Amazonian Machado River basin, Brazil. Fish were collected with seine and dip nets along an 80-m stretch of 28 streams. At each site, we recorded physical, chemical, and land-water ecotone variables. We collected 6,586 specimens of 109 species, being 39 and 18 of them exclusively of forested and deforested streams, respectively. Non-significant differences were found for abundance and species richness between forested and deforested streams. A total of four main trophic groups were identified. Carnivores were more abundant in forested streams, whereas herbivores, omnivores and detritivores species were the most abundant in deforested streams. The deforested streams showed higher abundance and richness of algae and periphyton consumers, while forested streams presented higher abundance and richness of invertebrate consumers. Forested streams presented longer foodchains, higher occurrence and abundance of species that have more specialized habits and are intolerant to degraded environments, whereas generalist and tolerant species predominated in deforested streams. We conclude that species composition in Amazonian streams predictably responds to the degree of forest cover.

中文翻译:

鱼类群落对亚马逊河流域的森林覆盖作出反应

摘要 原生林的移除会影响当地尺度的河流特征、过程和生物。我们比较了受森林砍伐影响的微流域和巴西亚马逊马查多河流域处于原始状态的微流域之间的鱼类组合结构。沿着 80 米长的 28 条溪流用围网和浸网收集鱼。在每个站点,我们记录了物理、化学和陆地-水交错带变量。我们收集了 109 个物种的 6,586 个标本,其中分别有 39 个和 18 个完全来自森林和砍伐森林的溪流。森林和森林砍伐的溪流之间的丰度和物种丰富度没有显着差异。总共确定了四个主要营养组。食肉动物在森林溪流中更为丰富,而食草动物,杂食动物和食腐动物物种在森林砍伐的溪流中最为丰富。砍伐森林的溪流显示出更高的藻类和附生生物消费者的丰度和丰富度,而森林覆盖的溪流则表现出更高的无脊椎动物消费者的丰度和丰富度。森林河流具有更长的食物链、更高的发生率和丰富的物种,这些物种具有更专门的习性并且不能容忍退化的环境,而通才和宽容的物种在森林砍伐的河流中占主导地位。我们得出结论,亚马逊河流中的物种组成可预测地响应森林覆盖程度。森林河流具有更长的食物链、更高的发生率和丰富的物种,这些物种具有更专门的习性并且不能容忍退化的环境,而通才和宽容的物种在森林砍伐的河流中占主导地位。我们得出结论,亚马逊河流中的物种组成可预测地响应森林覆盖程度。森林河流具有更长的食物链、更高的发生率和丰富的物种,这些物种具有更专门的习性并且不能容忍退化的环境,而通才和宽容的物种在森林砍伐的河流中占主导地位。我们得出结论,亚马逊河流中的物种组成可预测地响应森林覆盖程度。
更新日期:2020-03-01
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