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Vpliv biotskih in abiotskih dejavnikov na asimetrijo telesnih značilnosti pri kuščaricah
Alagić, Ajša (Author), Krofel, Miha (Mentor) More about this mentor... This link opens in a new window, Žagar, Anamarija (Co-mentor)

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Abstract
Namen magistrske naloge je bil raziskati pojav telesnih asimetrij pri pozidni kuščarici (Podarcis muralis) in velebitski kuščarici (Iberolacerta horvathi) ter kako so asimetrije povezane z naslednjimi potencialno stresnimi dejavniki: nadmorska višina, urbanizacija okolja in prisotnost druge vrste (medvrstno tekmovanje). Dodatno smo naredili še medvrstno primerjavo morfoloških telesnih značilnostih. Uporabili smo geometrijsko morfometrične metode, da smo ustvarili koordinate mejnih točk na fotografijah zgornje strani glave kuščaric, ki so bile uporabne za primerjalno analizo. Z uporabo modificiranih ANOV in indeksa asimetrije smo ugotavljali razlike v štirih telesnih značilnostih: velikost in oblika glave, dolžina telesa ter število supraciliarnih lusk. V raziskavo je bilo vključenih šestnajst populacij obeh vrst iz različnih lokacij po Sloveniji in na Hrvaškem. Ugotovili smo, da pri celotnem vzorcu prihaja do nihajoče asimetrije pri obliki glave in številu supraciliarnih lusk. Ne glede na vrsto so imele večjo asimetrijo glave kuščarice iz srednjih nadmorskih višin. Predvidevamo, da gre za posredni vpliv drugih dejavnikov, kot je manjša razpoložljivost ugodnih habitatov in večji pojav sintopičnih populacij na srednjih nadmorskih višinah. V populacijah pozidne kuščarice iz urbanih okolij nismo zaznali več asimetrij, kot v tistih iz naravnih okolij. Prav tako nismo našli več asimetrij v populacijah, kjer je bila prisotna druga vrsta, ampak smo v nasprotju s pričakovanji odkrili, da so imele kuščarice v alotopičnih populacijah večjo asimetrijo supraciliarnih lusk. Verjetno biotske interakcije nimajo tovrstnega negativnega vpliva, da bi se izrazile v povečani stopnji telesnih asimetrij v sintopiji. Na splošno so imele bolj asimetrično obliko glave velebitske kuščarice, kar bi lahko bila posledica izpostavljenosti večjemu okoljskemu stresu ali pa je vzrok genetski, saj so analize pokazale tudi prisotnost usmerjene asimetrije.

Language:Slovenian
Keywords:kuščarji/Podarcis muralis/Iberolacerta horvathi/stres/asimetrija/morfologija
Work type:Master's thesis/paper (mb22)
Organization:BF - Biotechnical Faculty
Year:2017
COBISS.SI-ID:4477775 Link is opened in a new window
Views:639
Downloads:288
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Secondary language

Language:English
Title:EFFECT OF BIOTIC AND ABIOTIC FACTORS ON ASYMMETRY OF PHYSICAL CHARACTERISTICS IN LACERTIDS
Abstract:
The main goal of this study was to investigate the appearance of asymmetry in the bodies of the common wall lizard (Podarcis muralis) and Horvath's rock lizard (Iberolacerta horvathi), as well as how these asymmetries are connected to the following potential stress factors: altitude, urbanization and the presence of another species (interspecific competition). In addition, we also made an interspecific comparison of morphological body characteristics. We used geometric morphometric methods to create landmark coordinates in the photographs of the upper side of lizards' heads, which were useful for our comparative analysis. Modified ANOVAs and an asymmetry index were used to find the differences in four physical characteristics: shape and size of the head, body size and the number of supraciliar scales. We included sixteen populations of both species from different locations across Slovenia and Croatia. We found out that there is a presence of fluctuating asymmetry in the number of supraciliar scales and the shape of the head in all of our samples. Results have shown that both species had more asymmetric heads in the middle altitude levels. We think there might be other factors, like lower availability of suitable habitats or higher presence of syntopic populations, indirectly affecting this result. In populations of the common wall lizard living in urban environment, we have not found any more asymmetries compared to those living in natural environments. We have also not found more asymmetries in syntopic populations, we actually found more asymmetries of supraciliar scales in allotopic populations. Biotic interactions probably do not have such a big effect that would cause asymmetries in the studied lizards in syntopy. Horvath's rock lizards had more asymmetric heads, which indicates they might be exposed to greater environmental stress or the reason could also be genetical, since the analyses have shown presence of directional asymmetry.

Keywords:lizards/Podarcis muralis/Iberolacerta horvathi/stress/asymmetry/morphology

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