Generalist populations formed by generalist individuals: a case of study on the feeding habits of a Neotropical stream fish

Q2 Environmental Science Acta Limnologica Brasiliensia Pub Date : 2021-09-22 DOI:10.1590/s2179-975x1721

Rafaela Carvalho Neves, P. P. Borges, J. O. Zeni, L. Casatti, F. B. Teresa

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引用次数: 1

Abstract

Abstract: Aim We described the diet of the generalist stream fish Knodus chapadae and we tested if the environmental conditions are associated with population’s diet and individual specialization. Methods We analyzed the stomach contents of 287 individuals from 29 streams from the Brazilian savanna (Cerrado). Results The instream physical habitat structure, physiochemical conditions, and adjacent land use explained partially the variation in the diet of populations, but not the variation in the individual specialization. Thus, the diet changes observed at populational level were driven by changes in the average composition of the diet of individuals that, in turn, remained generalists along the environmental gradient. Conclusions Our results show that the trophic opportunism described for small characids was also observed in K. chapadae, whose diet shifts according to changes in environmental conditions. Furthermore, the opportunism expressed at the individual level can explain the trophic plasticity observed on the studied species.

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由多面手个体形成的多面手种群:一种新热带流鱼摄食习性的个案研究

摘要：目的我们描述了多面手河鱼Knodus chapadae的饮食，并测试了环境条件是否与种群的饮食和个体特化有关。方法对来自巴西热带草原（Cerrado）29条溪流的287只个体的胃内容物进行分析。结果河流内的物理栖息地结构、理化条件和邻近土地利用部分解释了种群饮食的变化，但不能解释个体专业化的变化。因此，在人群水平上观察到的饮食变化是由个体饮食平均组成的变化驱动的，而这些变化反过来又是环境梯度上的多面手。结论我们的研究结果表明，小性状所描述的营养机会主义也在查帕达中观察到，其饮食会随着环境条件的变化而变化。此外，在个体水平上表达的机会主义可以解释在所研究物种上观察到的营养可塑性。

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