Journal
HYDROBIOLOGIA
Volume 806, Issue 1, Pages 111-121Publisher
SPRINGER
DOI: 10.1007/s10750-017-3344-7
Keywords
Benthic invertebrates; Competition; Masu salmon; Predation; Top-down effect
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Funding
- Japan Society for the Promotion of Science [JP16K07857]
- Grants-in-Aid for Scientific Research [16K07857] Funding Source: KAKEN
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Native species may show invasiveness toward a recipient ecosystem through increases in abundance as a result of artificial stocking events. Salmonid species are typical examples of native invaders whose abundance is increased after stocking with hatchery fish. This study evaluated the effects of hatchery chum salmon fry on sympatric wild masu salmon fry, benthic invertebrate prey, and algae, after a single stocking event in Mamachi stream, Hokkaido, northern Japan. The results suggested that the stocked hatchery chum salmon fry decreased the foraging efficiency and growth of the wild masu salmon fry through interspecific competition, and depressed the abundance of Ephemerellidae and total grazer invertebrates (Glossosomatidae, Heptageniidae, and Baetidae) through predation. Also, the hatchery chum salmon fry may increase algal biomass through depression of grazer abundance by predation (top-down effect). These results suggested that a single release of hatchery chum salmon fry into a stream may influence the recipient stream ecosystem.
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