Abstract
Human activities are one of the main causes of biodiversity loss and the reduction of ecosystem services. These activities, together with seasonality and the associated ecological and physicochemical changes, are the main modulators of fish communities in subtropical streams. Using data from 62 streams from Uruguay, we analyzed the effect of environmental variables on several attributes of fish community structure. First, we evaluated the effect of climatic seasonality on fish biomass, density, mean body length and weight using a paired t-test. Secondly, we analyzed the relationship between seasonality, environmental variables (environmental degradation, watershed area, and habitat diversity), and species richness with fish biomass using a linear mixed model. Fish biomass and density were higher in summer meanwhile, mean length was higher in winter. We found a humped relationship between biomass and environmental degradation in winter and summer, with low biomass in sites with high and low quality. Our model shows that species richness increase generates an increase in biomass, with the magnitude of this increase being greater during winter. In view of this results, we highlight that the humped pattern founded in our work should have special management attention to avoid misinterpretation of biomass increases caused by environmental degradation.
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Data availability
The datasets generated and analyzed during the current study will be made available from the corresponding author upon reasonable request.
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Acknowledgements
We would like to thank Guillermo Goyenola, Camila Vidal, Martin Pacheco, Lucia Hurtado, Nicolas Vidal, Clementina Calvo, and Maite Burwood for helping with sampling campaigns. We also thank Claudia Fosalba for nutrient analysis and German Taveira for his help with the geographic information analysis. Intendencia Municipal de Canelones supported the sampling campaign in the streams from the locality of Canelones. FTM was supported by ANII National System of Researchers (SNI) and PEDECIBA-Geociencias and Biologia.
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Tesitore, G., Teixeira de Mello, F. A humped pattern of standing fish biomass in lowland subtropical streams as a response to a gradient of environmental degradation, species richness and season. Hydrobiologia 851, 367–381 (2024). https://doi.org/10.1007/s10750-023-05255-x
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DOI: https://doi.org/10.1007/s10750-023-05255-x