Morphological characteristics of invasive signal crayfish Pacifastacus leniusculus (Dana, 1852) in the Mura and Korana rivers

Kolarić, Petra (2016) Morphological characteristics of invasive signal crayfish Pacifastacus leniusculus (Dana, 1852) in the Mura and Korana rivers. Diploma thesis, Faculty of Science > Department of Biology.

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Abstract

Signal crayfish, Pacifastacus leniusculus, is an invasive species of freshwater decapod crustaceans, which was first recorded in Croatia in 2008 in the Mura River. In 2011 this species was recorded in the Drava River, where it spread from the Mura River, and also in the Korana River, where it was introduced by human activities. Previous research has shown that the signal crayfish is dispersed in the lower course of the Mura and Korana rivers. The aim of this study was to compare the morphological features of geographically separate populations of this invasive signal crayfish species from Mura and Korana rivers, and to get a detailed insight into the population structure, as well as to determine possible differences between them. We analyzed 21 morphometric characteristics on 110 individuals of the signal crayfish, caught in two locations on each river. The results showed significant differences in morphological characteristics between the sexes at all investigated sites, and significant differences between localities and rivers, both in males and females. With multivariate discriminant analysis we determined the principal morphometric characteristics which separate the populations of signal crayfish. These differences in measured morphometric characteristics between the rivers can be attributed to differences in habitat, while differences between populations of the same river are probably driven by density-dependence processes and intraspecific competition on the growth of individuals.

Item Type: Thesis (Diploma thesis)
Keywords: freshwater ecosystems, biological invasions, alien species, population, Croatia
Supervisor: Maguire, Ivana
Date: 2016
Number of Pages: 44
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Silvana Šehić
Date Deposited: 25 Mar 2016 09:56
Last Modified: 25 Mar 2016 09:56
URI: http://digre.pmf.unizg.hr/id/eprint/4657

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