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Occurrence of four-spined Gasterosteus aculeatus in an isolated Croatian river population

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Abstract:

An isolated population of the three-spined stickleback Gasterosteus aculeatus in Croatia was found to have a high incidence of specimens either having a fourth dorsal spine or showing remnants of a fourth spine. Juvenile individuals showed a 9ยท4% incidence of a fourth spine. The population was examined for asymmetry of the skeletal defensive complex in order to determine whether the additional spine could be the result of developmental instability, a response to predation or environmental conditions.

Keywords: River Mirna; asymmetry

Document Type: Regular Paper

DOI: https://doi.org/10.1111/j.1095-8649.2009.02406.x

Affiliations: Department of Zoology, Faculty of Science, University of Zagreb, Rooseveltov trg 6, 10000 Zagreb, Croatia

Publication date: 2009-11-01

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