A comparative study of the physiological condition of native and invasive crayfish in Croatian rivers |
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Authors: | Andreja Lucić Sandra Hudina Matej Faller Darko Cerjanec |
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Institution: | 1.Department of Zoology, Division of Biology, Faculty of Science,University of Zagreb,Zagreb,Croatia;2.Po?ega,Croatia;3.Duga Resa,Croatia |
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Abstract: | The physiological condition of two invasive crayfish species identified in Croatian rivers (Orconectes limosus and Pacifastacus leniusculus) was compared with that of native crayfish populations (Astacus astacus and A. leptodactylus). Hepatosomatic, gonadosomatic and abdominal muscle indices were examined for all four species and within a specific invadernative
pair. The results demonstrate that invasive crayfish had better overall physiological condition when compared to native species,
with a higher energy content of the hepatopancreas, abdominal muscle and gonads in invasive than in native species, with the
exception of A. leptodactylus females which demonstrated an increased ability to allocate energy to reproduction in comparison with other species. These
results also indicate that A. astacus is physiologically more unstable than A. leptodactylus and thus more likely to be outcompeted and replaced by non-indigenous crayfish species. |
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