Individuals in food webs: the relationships between trophic position, omnivory and among-individual diet variation.

摘要: Among-individual diet variation is common in natural populations and may occur at any trophic level within a food web. Yet, little known about its among levels how such could affect phenotypic divergence populations. In this study we investigate the relationships between position (the population’s range average) among-individual variation. We test for individuals across size classes of Eurasian perch (Perca fluviatilis), widespread predatory freshwater fish that undergoes ontogenetic niche shifts. Second, invertebrate two different lake communities using stable isotopes. Third, potential evolutionary implications population by assessing relationship proportion piscivorous (populations higher position) degree littoral pelagic sub-populations. show highest intermediate positions, high likely causes an increase positions individuals. also found was negatively related to population. This thus shows be important as well