Changes in the density of introduced bullhead, Cottus gobio L., and its impact on juvenile Atlantic salmon, Salmo salar L., densities in a sub‐Arctic salmon river in northern Finland

Autor:	O. Pihlaja, M. Julkunen, Eero Niemelä, Jaakko Erkinaro
Rok vydání:	1998
Předmět:	geography geography.geographical_feature_category Ecology Introduced species Aquatic Science Biology Northern finland biology.organism_classification Fishery Sub arctic Tributary Juvenile Gobio Salmo Cottus
Zdroj:	Fisheries Management and Ecology. 5:189-199
ISSN:	1365-2400 0969-997X
Popis:	A newly introduced species, the bullhead, Cottus gobio L., was observed for the first time in the River Utsjoki, a tributary of the River Teno, in 1979. The River Teno is one of the most important Atlantic salmon, Salmo salar L., rivers in Northern Europe and its tributary the River Utsjoki is an important salmon spawning and nursery area. The densities of bullhead were lowest in the areas to which the species has spread most recently and highest in the areas downstream of its introduction point. Densities were markedly lower upstream. Statistical analysis showed that the presence of the bullhead had not affected juvenile salmon densities in the River Utsjoki.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3b20f84861f2484e3d9aefd80edd9fa5 https://doi.org/10.1046/j.1365-2400.1998.00083.x Zobrazit plný text záznamu Plný text ve formátu PDF