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- W2170897249 abstract "Loss and degradation of freshwater habitat reduces the ability of wild populations to endure other anthropogenic stressors such as climate change, harvest, and interactions with artificially propagated fishes. Preservation of pristine rivers has thus been advocated as a cost-effective way of sustaining wild Pacific populations. We examine the value of freshwater habitat protection in conserving and fostering resilience in the Kitlope watershed in northern coastal British Columbia —a large (3186 km2) and undeveloped temperate rainforest ecosystem with legislated protected status. In comparison with other pristine Pacific Rim rivers we studied, the Kitlope is characterized by abundant and complex habitats for that should contribute to high resilience. However, biological productivity in this system is constrained by naturally cold, light limited, ultra-oligotrophic growing conditions; and the mean (± SD) density of river-rearing salmonids is currently low (0.32 ± 0.27 fish per square meter; n = 36) compared to our other four study rivers (grand mean = 2.55 ± 2.98 fish per square meter; n = 224). Existing data and traditional ecological knowledge suggest that current returns of adult to the Kitlope, particularly sockeye, are declining or depressed relative to historic levels. This poor stock status—presumably owing to unfavorable conditions in the marine environment and ongoing harvest in coastal mixed-stock fisheries—reduces the salmon-mediated transfer of marine-derived nutrients and energy to the system's nutrient-poor aquatic and terrestrial food webs. In fact, Kitlope Lake sediments and riparian tree leaves had marine nitrogen signatures (δ15N) among the lowest recorded in a ecosystem. The protection of the Kitlope watershed is undoubtedly a conservation success story. However, salmon strongholds of pristine watersheds may not adequately sustain populations and foster social and ecological resilience without more holistic and risk-averse management that accounts for uncertainty and interactions between ecosystem fertility, harvest, climate dynamics, and food web dynamics in the marine and freshwater environments encompassed by the life cycle of the fish." @default.
- W2170897249 created "2016-06-24" @default.
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- W2170897249 date "2010-01-01" @default.
- W2170897249 modified "2023-09-27" @default.
- W2170897249 title "Research, part of a Special Feature on Pathways to Resilient Salmon Ecosystems Merits and Limits of Ecosystem Protection for Conserving Wild Salmon in a Northern Coastal British Columbia River" @default.
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