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- W2100039992 abstract "Land use conversion, especially to intensive agriculture, has been identified as the main driver of loss of biodiversity and ecological degradation in freshwater ecosystems worldwide. Intensive agriculture introduces multiple stressors to streams, including elevated levels of fine sediment and nutrients. Therefore, resource managers need to understand the effects of these stressors on aquatic ecosystems. In the present study, I combined two stream surveys and a novel reach-scale sediment addition/removal experiment in two New Zealand streams to investigate effects of dairy farming prevalence in the stream catchment (surveys) and surplus deposited fine sediment due to intensive land use (experiment) on stream physicochemistry, invertebrates and fish. One particular focus of my research was on an economically and recreationally important fish species, the introduced brown trout (Salmo trutta L.). In the surveys I hypothesized that, in parallel with rising prevalence of dairy farming in the catchments of the studied streams, (1) dissolved nutrients and deposited fine sediment levels will increase, (2) macroinvertebrate community health metrics will decline, and (3) densities of exotic trout (and possibly also native fish) will decrease. In the most novel objective of my second stream survey, I also predicted that (4) available invertebrate food for brown trout will decrease, resulting in less prey biomass eaten and poorer fish condition. My survey results demonstrated that increasing dairy farming prevalence was indeed associated with rising levels of nutrients and fine sediment, whereas invertebrate community health metrics and the prevalence of certain pollution-sensitive invertebrate taxa declined. Also as predicted, densities of brown trout and native fish declined as dairying became more prevalent, with no trout found in streams where dairy farms covered 50% or more of the catchment area. Interestingly, however, trout food intake and condition were unrelated to land use intensity in the catchment and trout and native fish became rarer." @default.
- W2100039992 created "2016-06-24" @default.
- W2100039992 creator A5031285911 @default.
- W2100039992 date "2014-01-01" @default.
- W2100039992 modified "2023-09-26" @default.
- W2100039992 title "Intensive land use effects on fish communities and their invertebrate prey in Otago, New Zealand" @default.
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