00000nam 2200000zi 4500 9.925348 CaOODSP 20230731111029 m o d f cr bn |||||||| 230721e197707 bccad obt f000 0 eng d CaOODSP eng rda CaOODSP eng eng fre Fs97-4/1428E-PDF Glova, G. J. (Gordon John), 1939- author. Interactions for food and space between sympatric populations of underyearling coho salmon and coastal cutthroat trout in a stream simulator during summer / by G.J. Glova and J.C. Mason. Nanaimo, British Columbia : Pacific Biological Station, Fisheries and Marine Service, Department of Fisheries and the Environment, July 1977. 1 online resource (iii, 36 pages) : illustrations, graphs text txt rdacontent computer c rdamedia online resource cr rdacarrier Fisheries and Marine Service manuscript report ; 1428 Digitized edition from print [produced by Fisheries and Oceans Canada]. Includes bibliographical references (pages 12-13). Interactions for food and space between sympatric populations of underyearling coho salmon and coastal cutthroat trout were investigated in a stream simulator during summer. In sympatry, partitioning of space was rapid and similar to that in nature, in that coho numerically dominated pools and trout dominated riffles. In allopatry, their microhabitat use was similar, in that 60-75% of either species occupied pools. Factorial analyses of variance indicated that size of fish, simulated food supply and water velocity were ranked (high to low) as affecting microdistribution. Coho and cutthroat trout fry communicated using an array of similar body postures and movements, with chases, nips and lateral displays comprising more than 80% of their total aggressive activity. Non-contact behaviors were more frequently used by coho; nipping was more frequently used by trout. Both salmonids were most aggressive when food was present. Species levels of aggressiveness were similar in allopatry, but differed between habitat types in sympatry, coho being more inclined to defend pools and trout riffles. Stream management strategy should take into account the importance of maintaining habitat diversification in streams supporting sympatric populations of coho salmon and cutthroat trout. Includes abstracts in English and French. Coho salmon Ecology. Coastal cutthroat trout Ecology. Saumon coho Écologie. Truite fardée côtière Écologie. Technical reports lcgft Rapports techniques rvmgf Mason, J. C. (John Christopher), 1932- author. Canada. Fisheries and Marine Service, issuing body. Pacific Biological Station (1972- ), issuing body. Manuscript report (Canada. Fisheries and Marine Service) no. 1428. (CaOODSP)9.924185 PDF 1.03 MB https://publications.gc.ca/collections/collection_2023/mpo-dfo/fs97-4/Fs97-4-1428-eng.pdf