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Shifts of food habit and jaw position of white‐spotted charr after damming
Author(s) -
Morita K.,
Suzuki T.
Publication year - 1999
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.1999.tb02066.x
Subject(s) - biology , predation , sympatric speciation , benthic zone , fishery , white (mutation) , habit , perch , fish <actinopterygii> , zoology , ecology , psychology , biochemistry , psychotherapist , gene
Stomach fullness of white‐spotted charr, Salvelinus leucomaenis did not differ significantly between above‐dam (allopatric with masu salmon) and below‐dam (sympatric with masu salmon) areas, but stomach contents did. Juveniles (1+) below the dam consumed relatively more aquatic insects (benthic prey), and those above the dam consumed relatively more terrestrial insects (drifting prey), but there was no difference in the diet of >2+ fish between areas. The mouths of juveniles above the dam were more terminal than those of fish below the dam. The adaptive significance of these differences is discussed in relation to differences in fish assemblages. 1999 The Fisheries Society of the British Isles