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Barriers to salmon migration impact body condition, offspring size, and life history variation in an avian consumer [Ecography]

par Frédéric Magné - publié le

The impacts of barriers, such as dams, and associated stream effects on the migration of salmon have been well documented, but there is much less information on consequences for terrestrial vertebrates in these freshwater systems. Salmon themselves provide food resources to higher trophic levels and deposit rich marine-derived nutrients (MDN) that benefit the base of freshwater food webs. We studied a higher-order terrestrial consumer of aquatic prey, the American dipper Cinclus mexicanus, in a riparian food web, to test the hypothesis that barriers to salmon migration negatively impact body condition, and ultimately life history. (...)

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