Common adder, Vipera berus (Squamata, Viperidae) in Croatia: population ecology, microhabitat preferences and thermoregulation

Vilaj, Igor (2012) Common adder, Vipera berus (Squamata, Viperidae) in Croatia: population ecology, microhabitat preferences and thermoregulation. Diploma thesis, Faculty of Science > Department of Biology.

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Abstract

The Adder, Vipera berus (Linnaeus, 1785) is the most widespread and also the northernmost distributed terrestrial snake species in the world. In Croatia, there are two subspecies of the adder in three separate populations. Field work was conducted on two different localities in Croatia: Okuje (Turopolje, river Sava Valley; V. b. bosniensis) and Begovo Razdolje (Gorski kotar; V. b. berus). The monitoring was conducted by Capture – Mark – Recapture method during a four year period in Okuje (2009 – 2012), and a three year period in Begovo Razdolje (2009 – 2011). The main goals of this study were to determine if there are intrapopulation or interpopulation similarities or differences in microhabitat preferences, thermoregulation, daily or yearly activity period, gender structure of population and meristic characteristics. We collected 106 adders (50 from Begovo Razdolje and 56 from Okuje). The analyses have shown that there are statistically significant differences between the two populations in head length, head height and weight. The individuals from Okuje prefer a closed type of microhabitat, unlike individuals from Begovo Razdolje that prefer an opened type of microhabitat. In both populations, there are differences in the gender structure, and thermoregulation which is sex and colour morph dependent. In Okuje, Adders begin their activity period in March as opposed to individuals from Begovo Razdolje whose activity period begins in June.

Item Type: Thesis (Diploma thesis)
Keywords: Capture – Mark – Recapture method, Adder, Vipera berus, microhabitat, thermoregulation, activity period, gender structure, meristic characteristics
Supervisor: Mrakovčić, Milorad
Date: 2012
Number of Pages: 50
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Grozdana Sirotic
Date Deposited: 10 Mar 2014 11:00
Last Modified: 22 Sep 2014 08:21
URI: http://digre.pmf.unizg.hr/id/eprint/557

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