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• W2227295637 abstract "Stream macroinvertebrates have a fundamental role in river ecosystem function through their feeding habits. However, little is known about the diet of these organisms in the Neotropic. In the present study we characterized the diet of four stream macroinvertebrate morphospecies (Anacroneuria sp.1, Baetodes sp. 5, Leptohyphes sp. 3 y Smicridea sp. 3). We also studied the effect of altitude and individual size over the feeding habits of these macroinvertebrates and investigated the possible relationship between dietary composition and environmental variables for the mentioned species. We carried out our investigation in tributary streams of the Oyacachi River between 1805-3867 masl. We did a gut content analysis on the macroinvertebrates and classified their diet composition with fuzzy codes and Simpson’s food diversity index.We found that Smicridea sp. 3 and Anacroneuria sp.1 have a more generalist diet than Leptohyphes sp. 3 and Baetodes sp. 5. Furthermore, both in Leptohyphes sp. 3 and in Smicridea sp. 3, trophic diversity increases with increasing individual body size. In the generalist species we also found that diet composition is associated with individual body size so that larger individuals consume progressively more of larger food types and less of fine particulate organic matter (FPOM). Specifically, we found that in Anacroneuria sp. 1, Leptohyphes sp. 3, and Smicridea sp. 3 the proportion of FPOM in their diet decreased with increasing individual body size. On the other hand, we found that there is a variation in the proportion of food types along the elevation gradient for the more generalist species. We also found that diet diversity varied among elevation sites (except for Baetodes sp. 5). This variation in the diet composition and in diet diversity along the elevation gradient is an indicator of trophic plasticity among the species where it occurred. Finally, we found that the relationship between feeding habits and environmental variables is not straightforward. This suggests that dietary differences within a species are associated with different community level dynamics. The diet composition of macroinvertebrates is thus a dynamic characteristic and in the future other factors should be accounted for in the description of its variation. Specifically, data on the abundance of food sources and on possible interactions with biological factors such as predation and competition could shed light on the processes that lie behind trophic plasticity and diversity of stream macroinvertebrates" @default.
• W2227295637 created "2016-06-24" @default.
• W2227295637 creator A5067089961 @default.
• W2227295637 date "2014-01-01" @default.
• W2227295637 modified "2023-09-23" @default.
• W2227295637 title "Trophic variability of stream macroinvertebrates along an altitudinal gradient and among size groups in the Oyacachi River Basin" @default.
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