Open AccessBody morphology of crucian carp Carassius carassius in lakes with or without piscivorous fish
Author(s) -
Poléo Antonio B. S.,
Osxnevad Sigurd A.,
Össtbye Kjartan,
Heibo Erik,
Andersen Ronny A.,
Vøllestad L. Asbjøm
Publication year - 1995
Publication title -
ecography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.973
H-Index - 128
eISSN - 1600-0587
pISSN - 0906-7590
DOI - 10.1111/j.1600-0587.1995.tb00125.x
Subject(s) - crucian carp , esox , predation , biology , perch , pike , piscivore , sympatric speciation , cyprinidae , carassius , ecology , predator , fishery , brown trout , percidae , salmo , sympatry , fish <actinopterygii>
Crucian carp Carassius carassius was sampled during 1993 and 1994 in 21 lakes and ponds in east Norway In 10 of these lakes and ponds no piscivorous fish species was present, and in the remaining 11 lakes and ponds predators such as perch Perca fluvtalilis. pike Esox lucius, and trout Salmo trutta were common In general, crucian carp was larger in the lakes with predators than in those without predators The relative body depth (body height/body length) of crucian carp was significantly deeper in populations sympatric with predators (mean 0 358), compared to allopatric populations (mean 0 286) The variation in relative body depth was larger among the sympatric populations than among the allopatric populations The observed difference in relative body depth may be due to 1) predator induced changes m body morphology, 2) increased growth rates in lakes containing predator due to reduced intraspecific competition, and 3) size‐selective predation