Distribution and population characteristics of the invasive crayfish species Pacifastacus leniusculus (Dana, 1852) and the native crayfish species Astacus astacus (Linné, 1758) in Međimurje

Janković, Sara (2011) Distribution and population characteristics of the invasive crayfish species Pacifastacus leniusculus (Dana, 1852) and the native crayfish species Astacus astacus (Linné, 1758) in Međimurje. Diploma thesis, Faculty of Science > Department of Biology.

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Abstract

The aim of this work was to examine the population size and characteristics of the invasive signal crayfish in the Mura River and the current distribution and population characteristics of the indigenous noble crayfish populations in Međimurje. The signal crayfish population was examined at two locations, whereas the noble crayfish populations were examined at 53 locations, with baited LiNi traps. The estimated density of the signal crayfish in the Mura River belongs to mean values recorded for this species in Europe. The distribution of the noble crayfish populations in MeĎimurje is narrow, since crayfish were present in only 17 % of the examined locations, mainly in gravel pits (66 %) where they were introduced anthropogenically. The analysis of size and gender showed that populations of both species were relatively stable. Since gravel pits are unfavourable habitats for noble crayfish, increased proportion of body injuries (42 %) was recorded in these populations. Noble crayfish individuals were on average larger and heavier than signal crayfish, which indicates that the recently established signal crayfish population in the Mura River did not reach its maximum size and density at the time.

Item Type: Thesis (Diploma thesis)
Keywords: noble crayfish, signal crayfish, population size, distribution, size and gender structure of populations
Supervisor: Lajtner, Jasna
Co-supervisor: Hudina, Sandra
Date: 2011
Number of Pages: 68
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Silvana Šehić
Date Deposited: 01 Sep 2014 12:11
Last Modified: 18 Sep 2014 08:50
URI: http://digre.pmf.unizg.hr/id/eprint/2570

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