Meta-analysis Shows a Consistent and Strong Latitudinal Pattern in Fish Omnivory Across Ecosystems |
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Authors: | Ivan González-Bergonzoni Mariana Meerhoff Thomas A Davidson Franco Teixeira-de Mello Annette Baattrup-Pedersen Erik Jeppesen |
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Institution: | 1.Departamento de Ecología y Evolución, Centro Universitario Regional Este-Facultad de Ciencias,Universidad de la República,Maldonado,Uruguay;2.Department of Bioscience,Aarhus University,Silkeborg,Denmark;3.South American Institute for Resilience and Sustainability Studies (SARAS),Maldonado,Uruguay;4.Department of Geography, ECRC,UCL,London,UK;5.Sino-Danish Centre for Education and Research (SDC),Beijing,China;6.Greenland Climate Research Centre (GCRC),Greenland Institute of Natural Resources,Nuuk,Greenland |
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Abstract: | Several studies have demonstrated a latitudinal gradient in the proportion of omnivorous fish species (that is, consumers of both vegetal and animal material) in marine ecosystems. To establish if this global macroecological pattern also exists in fresh and brackish waters, we compared the relative richness of omnivorous fish in freshwater, estuarine, and marine ecosystems at contrasting latitudes. Furthermore, we sought to determine the main environmental correlates of change in fish omnivory. We conducted a meta-analysis of published data focusing on change in the relative richness of omnivorous fishes in native fish communities along a broad global latitudinal gradient, ranging from 41°S to 81.5 N° including all continents except for Antarctica. Data from streams, rivers, lakes, reservoirs, estuaries, and open marine waters (ca. 90 papers covering 269 systems) were analyzed. Additionally, the relationship between the observed richness in omnivory and key factors influencing trophic structure were explored. For all ecosystems, we found a consistent increasing trend in the relative richness of omnivores with decreasing latitude. Furthermore, omnivore richness was higher in freshwaters than in marine ecosystems. Our results suggest that the observed latitudinal gradient in fish omnivory is a global ecological pattern occurring in both freshwater and marine ecosystems. We hypothesize that this macroecological pattern in fish trophic structure is, in part, explained by the higher total fish diversity at lower latitudes and by the effect of temperature on individual food intake rates; both factors ultimately increasing animal food limitation as the systems get warmer. |
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