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Fish assemblages respond to forest cover in small Amazonian basins

机译：鱼群组合响应小型亚马逊盆地的森林覆盖物

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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.
机译：去除本地森林会影响当地规模的流特征，过程和生物。我们比较了被砍伐森林群体影响的微球蛋白与巴西亚马逊马拉多河流域的原始病症之间的鱼组合的结构。沿着80米的28个溪流沿着塞纳河和浸网收集鱼。在每个网站上，我们记录了物理，化学和陆地水路变量。我们分别收集了6,586种109种标本，分别为森林和森林砍伐的流分别为39和18种。在森林和森林砍伐流之间的丰富和物种丰富度被发现非显着差异。共识别出四个主要的营养群体。食肉动物在森林溪流中更丰富，而食草动物，套生病毒和碎屑物种在森林般的溪流中最丰富。森林砍伐的溪流显示出较高的丰富和丰富的藻类和围虫中的消费者，而森林溪流呈现出较高的丰富性和无脊椎动物消费者的丰富性。森林繁殖的溪流呈现较长的食谱，更高的出现和丰富的物种，具有更专业的习惯，并且与降级的环境变得不宽容，而在森林砍伐流中占主导地位的一般和耐受性。我们得出结论，亚马逊流中的物种组成可预测地响应森林覆盖程度。

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