Impacts of hydroelectric dams on fishes and fisheries in tropical rivers through the lens of functional traits
Current Opinion in Environmental Sustainability, 2019•Elsevier
Highlights•River impoundment results in fairly predictable changes in fish functional
diversity.•The most vulnerable species have functional traits associated with flowing water,
flow pulses, and habitat complexity and connectivity.•Changes in distributions of functional
traits negatively affect fishery yields, market values, traditional fishing practices and
ecosystem properties.•Effects are not limited to the reservoir and often extend to reaches far
upstream and downstream of dams.•Functional approaches can improve our ability to …
diversity.•The most vulnerable species have functional traits associated with flowing water,
flow pulses, and habitat complexity and connectivity.•Changes in distributions of functional
traits negatively affect fishery yields, market values, traditional fishing practices and
ecosystem properties.•Effects are not limited to the reservoir and often extend to reaches far
upstream and downstream of dams.•Functional approaches can improve our ability to …
Highlights
- River impoundment results in fairly predictable changes in fish functional diversity.
- The most vulnerable species have functional traits associated with flowing water, flow pulses, and habitat complexity and connectivity.
- Changes in distributions of functional traits negatively affect fishery yields, market values, traditional fishing practices and ecosystem properties.
- Effects are not limited to the reservoir and often extend to reaches far upstream and downstream of dams.
- Functional approaches can improve our ability to predict the responses of fishes and fisheries to hydroelectric dams across multiple scales.
We summarize observed and expected impacts of hydroelectric dams on tropical fishes and fisheries through the lens of fish functional traits and consequences of shifting functional diversity for social-ecological systems. Following impoundment, stocks respond to environmental changes differently according to their functional traits, resulting in fairly predictable shifts in assemblage functional structure. The most vulnerable species are those with traits adaptive for habitats with fast flowing water, structural complexity, flood pulsing or those requiring connectivity across basins to complete their life cycle. Shifts in assemblage functional trait distributions are accompanied by reduced fishery yields and impacts to other ecosystem services. Research employing a functional traits approach should enhance assessment of impacts of impoundments on biodiversity, fisheries and ecosystem services, especially for data-deficient systems.
Elsevier
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