Interactions between local population density and limited habitat resources determine movements of juvenile Atlantic salmon
| Autor: | Anders Foldvik, Sigurd Einum, Maxim A.K. Teichert, Torbjørn Forseth, Ola Ugedal, Anders Gravbrøt Finstad |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
education.field_of_study Ecology 010604 marine biology & hydrobiology media_common.quotation_subject Population Zoology and botany: 480 [VDP] Aquatic Science 010603 evolutionary biology 01 natural sciences Competition (biology) Fishery Key factors Geography Habitat Juvenile Local population education Limited resources Zoologiske og botaniske fag: 480 [VDP] Ecology Evolution Behavior and Systematics media_common |
| Zdroj: | Canadian Journal of Fisheries and Aquatic Sciences |
| Popis: | Competition for limited resources and the resulting density-dependent processes are key factors in driving stream salmonid population dynamics. Here we test for the combined effects of density and shelter availability on the movement of juvenile Atlantic salmon in a Norwegian river. Individually marked, hatchery reared salmon juveniles were released at 26 sites along a 2.5 km long stretch and recaptured after 12 months. The spatial variation in shelter availability and density of salmonids was quantified prior to the release. We found no effect of released fish number on the number of marked salmon moving more than 12.5 – 112.5 m away from their release site. However, the ratio of pre-experiment fish density per shelter was positively related to the number of movers. Thus, fish that were released at sites where the amount of shelter was low relative to the density of the pre-experiment population were more likely to move. These results support the prediction from smaller scale experimental studies that shelter availability may act to determine local carrying capacity in stream living salmonid populations. This is the authors' accepted and refereed manuscript to the article. Non-commercial. |
| Databáze: | OpenAIRE |
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