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Richness and abundance of stream fish communities in a fragmented neotropical landscape
Environmental Biology of Fishes ( IF 1.4 ) Pub Date : 2021-03-01 , DOI: 10.1007/s10641-021-01066-y
Samuel S Leberg , Ramiro Barriga , Henry Bart , Alfredo Olivo , Kaushik Narasimhan , Jordan Karubian

Environmental conditions influence ecological processes that shape stream community diversity and abundance. Deforestation has the potential to limit available particulate organic matter and raise stream temperatures. The degree to which tropical stream communities are impacted by these changes is likely to differ between systems, but empirical data from tropical regions are lacking. This lack of baseline data hinders conservation policy as well as efforts to better understand biogeographic and anthropogenic impacts on species’ distributions. To fill this knowledge gap, we surveyed 27 sites in six previously unstudied streams across a gradient of deforestation in northwest Ecuador and assessed the degree to which localized deforestation predicted patterns of community composition of fishes. Using general linear mixed models and AICC we found that neither forest fragmentation nor canopy closure was a significant predictor of species richness and found no difference between the species richness of fragmented and continuous sites. However, forest fragmentation was a strong predictor of abundance, occurring in 31 of 31 general linear mixed models, with higher abundance in fragmented forest than in continuous forest. Of 16 species found, eight occurred at five or more sites and one (Pseudochalceus boehlkei), numbered 200 out of 627 individuals. NMDS and SIMPER analysis suggested that community composition differed between fragmented and continuous sites. P. boehlkei, Pseudopoecilia fria, and Astroblepus cf. fissidens species presented in higher abundances in deforested sites, possibly suggesting a less functionally diverse community. This pattern is consistent with neotropical streams that have experienced partial deforestation but not total degradation of habitat.



中文翻译:

破碎的新热带景观中溪流鱼类群落的丰富和丰富

环境条件影响着塑造河流群落多样性和丰度的生态过程。砍伐森林有可能限制可用的颗粒有机物并提高溪流温度。这些变化对热带溪流群落影响的程度可能在系统之间有所不同,但缺乏热带地区的经验数据。基线数据的缺乏阻碍了保护政策以及努力更好地了解生物地理和人为因素对物种分布的影响。为了填补这一知识空白,我们在厄瓜多尔西北部的一片森林砍伐梯度中的六个先前未研究的溪流中调查了27个地点,并评估了局部森林砍伐预测鱼类群落组成模式的程度。使用一般的线性混合模型和AICC,我们发现森林的破碎和冠层的封闭都不是物种丰富度的重要预测指标,而零碎的和连续的物种丰富度之间没有差异。但是,森林破碎化是丰度的有力预测指标,在31个一般线性混合模型中有31个发生,零碎森林的丰度高于连续森林。在发现的16种物种中,有8种出现在5个或更多地点,其中1个(与连续森林相比,零散森林的丰度更高。在发现的16种物种中,有8种出现在5个或更多地点,其中1个(与连续森林相比,零散森林的丰度更高。在发现的16种物种中,有8种出现在5个或更多地点,其中1个(假单胞菌(Pseudochalceus boehlkei),在627个个体中有200个。NMDS和SIMPER分析表明,零星的和连续的地点之间的群落组成是不同的。P. boehlkeiPseudopoecilia friaAstroblepus参见。fissidens物种在森林砍伐的地区以较高的丰度出现,这可能表明其功能多样性较低。这种模式与经历了部分森林砍伐但并未完全破坏栖息地的新热带河流相一致。

更新日期:2021-03-01
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