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- W4290102368 abstract "Ecological traps can be caused when partial restoration leads organisms to make maladaptive habitat choices. One example of this is fishways (e.g., fish ladders) that provide upstream passage at dams but are not paired with adequate downstream passage. We tested the hypothesis that attracting anadromous fishes to spawn above a dam, but blocking downstream passage of their offspring leads to an ecological trap. Using passive integrated transponder (PIT) tags, we monitored the movements of steelhead ( Oncorhynchus mykiss) at a dam and fishway on the central California coast. We found that downstream passage for juveniles and kelts was limited by four factors: migration delay, loss in the reservoir, avoidance of the downstream bypass, and water depths on the spillway. Based on the spillway-passage depth thresholds, we estimated that the ability for fish to pass downstream was limited to only half of the migration season in 55% of the past 20 years (2002–2021). Our results support the ecological trap hypothesis, which may explain why restoration using fishways has failed to produce recovery gains in this population and elsewhere." @default.
- W4290102368 created "2022-08-06" @default.
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- W4290102368 date "2022-12-01" @default.
- W4290102368 modified "2023-09-27" @default.
- W4290102368 title "Poor downstream passage at a dam creates an ecological trap for migratory fish" @default.
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- W4290102368 doi "https://doi.org/10.1139/cjfas-2022-0095" @default.
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