Simultaneous abrupt shifts in hydrology and fish assemblage structure in a floodplain lake in the central Amazon
Combined effects of climate change and deforestation have altered precipitation patterns in the Amazon. This has led to changes in the frequency of extreme events of flood and drought in recent decades and in the magnitude of the annual flood pulse, a phenomenon that influences virtually all aspects...
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| Veröffentlicht in: | Scientific reports 2017-01, Vol.7 (1), p.40170-40170, Article 40170 |
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| creator | Röpke, Cristhiana P. Amadio, Sidinéia Zuanon, Jansen Ferreira, Efrem J. G. Deus, Cláudia Pereira de Pires, Tiago H. S. Winemiller, Kirk O. |
| description | Combined effects of climate change and deforestation have altered precipitation patterns in the Amazon. This has led to changes in the frequency of extreme events of flood and drought in recent decades and in the magnitude of the annual flood pulse, a phenomenon that influences virtually all aspects of river-floodplain ecosystem dynamics. Analysis of long-term data revealed abrupt and synchronous changes in hydrology and fish assemblage structure of a floodplain lake near the confluence of Amazon and Negro rivers. After an intense drought in 2005, the assemblage assumed a different and fairly persistent taxonomic composition and functional structure. Declines in abundance after 2005 were more pronounced for species of all sizes having equilibrium life history strategy, large species with periodic life history strategy, and for all trophic levels except primary consumers. Our results suggest that the extreme drought triggered changes in the fish assemblage and subsequent anomalous hydrological conditions have hampered assemblage recovery. These findings stress the need to account for climatic-driven hydrological changes in conservation efforts addressing aquatic biodiversity and fishery resources in the central Amazon. |
| doi_str_mv | 10.1038/srep40170 |
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Declines in abundance after 2005 were more pronounced for species of all sizes having equilibrium life history strategy, large species with periodic life history strategy, and for all trophic levels except primary consumers. Our results suggest that the extreme drought triggered changes in the fish assemblage and subsequent anomalous hydrological conditions have hampered assemblage recovery. 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| subjects | 631/158/2165 631/158/2459 Abundance Animals Aquatic ecosystems Biodiversity Biota Climate Change Climate effects Conservation of Natural Resources Consumers Data processing Deforestation Drought Ecosystem dynamics Extreme drought Fish Fishery resources Fishes - classification Fishes - growth & development Floodplains Floods Humanities and Social Sciences Hydrology Lakes Life history Longitudinal Studies multidisciplinary Rivers Science Science (multidisciplinary) Trophic levels Water Cycle |
| title | Simultaneous abrupt shifts in hydrology and fish assemblage structure in a floodplain lake in the central Amazon |
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