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• W2955272523 abstract "The Water Framework Directive was widely welcomed because it sought to integrate chemical and biological elements of aquatic ecosystems to achieve ‘good ecological status’, reflecting at most slight anthropogenic impact. However, implementation has been criticised because of the failure to adequately integrate these elements and assess status of the whole ecosystem. In this study, a suite of environmental and biotic variables was measured to assess their relative importance as predictors of lake status for 50 lakes in the north of the island of Ireland. Total Phosphorus (TP) had a strong effect on taxon biomasses and ecological quality ratios (EQR) for most taxa, as expected, but other environmental variables, such as pH, water colour and spatial location, were also important. Most variance in mean EQR, the average of the taxon values, was predicted by five environmental variables (chlorophyll a , TP, population density, water colour and elevation) and whether (alien) cyprinid fish were present. Oligotrophic lakes with cyprinid fish had lower mean EQRs than cyprinid-free lakes, indicating the importance of recording species introductions when assessing lake status. Strong evidence for bottom-up effects was also detected, and cyprinids probably influenced trophic structure by increasing nutrient release from the sediment rather than by top-down effects. Phytoplankton biomass, fish biomasses, and the percentage of predatory fish, increased with TP. Our results further emphasize the need to adopt a more integrated approach when assessing lake status. • Contributions of environmental and biotic variables were determined for 50 lakes • Strong evidence for bottom-up rather than top-down trophic effects detected • Lakes with introduced cyprinid fish had lower ecological quality • Limited concordance in the responses of BQEs to environmental variables • Chlorophyll a , TP, population density, water colour and elevation predict mean EQR" @default.
• W2955272523 created "2019-07-12" @default.
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• W2955272523 date "2019-11-01" @default.
• W2955272523 modified "2023-09-26" @default.
• W2955272523 title "Assessing lake ecological status across a trophic gradient through environmental and biological variables" @default.
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• W2955272523 doi "https://doi.org/10.1016/j.scitotenv.2019.07.038" @default.
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