Natural hybridization of italian wall lizard - Podarcis sicula

Kalčićek, Matea (2012) Natural hybridization of italian wall lizard - Podarcis sicula. Bachelor's thesis, Faculty of Science > Department of Biology.

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Abstract

Every known case of natural hybridization is related with changes of natural habitat, mostly connected with human activity such as introduction of Podarcis sicula on islands Marettimo and Vulcano and with increase of the sympatric space. Changes in habitats could have resulted in weakening of the isolation mechanisms which could have led into hybridization. Evidence of hybrids were found using electrophoretic analysis of the allozymes, thanks to which diagnostic loci were discovered. The genetically pure Podarcis sicula has Idh- , Got- , Mpi, Gpi, while genetically pure Podarcis tiliguerta has Idh- , Got- , Mpi, Gpi. Thanks to this, hybrid zone was detected about 3 km NW from Capoterra (south Sardinia), with width no greater than 1 km. Backcross individuals were not found at this location. In second case, populations from Sardinia, Aegadian and Aeolian Archipelago were analysed (the total of 302 individuals). Here the diagnostic loci for Podarcis sicula were Gapd, Got- , Gp- , Gp- , and for Podarcis wagleriana Gapd, Got- , Gp- , Gp- . F1 Hybrids were found with following loci : Gapd , Got- , Gp- , as well as the backcross individuals with loci Gapd, Gp- , Gp- , and loci Got- that was previously typical for Podarcis wagleriana. This shows that hybridization took place in Marettimo and Volcano where the isolation mechanisms were weakened. In my opinion, M. Capula managed to prove the hybridization in both cases, thanks to allozyme analysis. The mere fact that backcross individuals were found indicates that species successfully overcame isolation mechanisms, and the fact that they were able to produce fertile offsprings indicates that more research is needed to discover the ecology of these individuals. Also I think that it is very important to carry out a study on hybridization on our coast, keeping in mind the very nature of Podarcis sicula and her exceptional ability to adapt. Also, a very interesting fact, in my opinion, is that all hybrids were found in degradated and alternated habitats so further research would be advised to learn exactly which factors influence the rise of hybridization and why.

Item Type: Thesis (Bachelor's thesis)
Supervisor: Zanella, Davor
Date: 2012
Number of Pages: 21
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Silvana Šehić
Date Deposited: 21 Oct 2014 11:41
Last Modified: 21 Oct 2014 11:41
URI: http://digre.pmf.unizg.hr/id/eprint/3123

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