Morfometrična analiza mandibul velikega voluharja, Arvicola terrestris (Linnaeus, 1758)

Nezman, Nuša

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Title:	Morfometrična analiza mandibul velikega voluharja, Arvicola terrestris (Linnaeus, 1758)
Authors:	ID Nezman, Nuša (Author) ID Janžekovič, Franc (Mentor) More about this mentor... ID Kryštufek, Boris (Comentor)
Files:	MAG_Nezman_Nusa_2018.pdf (2,82 MB) MD5: 680EFFC37525453FB5DC76A565CE2054 PID: 20.500.12556/dkum/3cd996d5-9caf-4664-acf5-2513992a452d
Language:	Slovenian
Work type:	Master's thesis/paper
Typology:	2.09 - Master's Thesis
Organization:	FNM - Faculty of Natural Sciences and Mathematics
Abstract:	Tema magistrske naloge je bila morfometrična analiza variabilnosti mandibule pri velikem voluharju, Arvicoli terrestris (Linnaeus, 1758). Raziskovani material je zajemal 597 osebkov z različnih geografskih območij: iz Avstrije, Bolgarije, Nemčije, Španije, Švice, s Češke, Madžarske in Slovaške. Material izvira iz različnih muzejskih zbirk. Zaradi izredne ekološke plastičnosti velikega voluharja, največje evropske voluharice, prihaja med populacijami do izrazite variabilnosti v telesni velikosti in obliki. Namen dela je bil s pomočjo geometrijske morfometrije odkriti, ali obstajajo razlike v velikosti in obliki spodnje čeljustnice (mandibule) med živalmi z različnih geografskih območij, in oceniti razlike med spoloma. Po določitvi 13 oslonilnih točk na mandibulah smo opravili uni- in multivariatne analize. Preverjanje morebitnih razlik v velikosti in obliki je potekalo ločeno. Pri preverjanju sekundarnega spolnega dimorfizma smo ugotovili, da ne prihaja do razlik med spoloma, zato smo v nadaljevanju raziskave oba spola obravnavali skupaj. V nadaljevanju smo pri preverjanju geografske variabilnosti v velikosti mandibul znotraj vrste Arvicola terrestris prepoznali tri velikostne razrede. V najmanjši razred so se uvrščale mandibule vseh osebkov iz Avstrije in večine osebkov iz Švice, največje mandibule pa so imeli osebki, ulovljeni na območju Bolgarije, Madžarske in Nemčije. Izstopal je material iz Španije, ki je zajemal devet osebkov vrste Arvicola sapidus. Tudi pri preverjanju geografske variabilnosti v obliki smo opazili razlike. Te smo zaznali tako na sprednjem predelu z meljaki kot tudi na veji mandibule s tremi odrastki. Celotna mandibula postaja krajša in kompaktnejša. Pri analizi kopičenja na osnovi oblike smo prepoznali sedem skupin, ki so bile geografsko ustrezne.
Keywords:	veliki voluhar, Arvicola terrestris, spodnja čeljustnica, mandibula, oslonilna točka, geometrijska morfometrija, sekundarni spolni dimorfizem, geografska variabilnost
Place of publishing:	Maribor
Publisher:	[N. Nezman]
Year of publishing:	2018
PID:	20.500.12556/DKUM-72728
UDC:	599.323.52:591.152(043.2)
COBISS.SI-ID:	24231944
NUK URN:	URN:SI:UM:DK:K1XHYQLW
Publication date in DKUM:	13.12.2018
Views:	1731
Downloads:	129
Metadata:
Categories:	FNM
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Licences

License:	CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International

Link:	http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:	The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:	25.10.2018

Secondary language

Language:	English
Title:	Morphometric analysis of the mandibles of the European water vole, Arvicola terrestris (Linnaeus, 1758)
Abstract:	The subject of the master’s thesis was a morphometric analysis of the variability of the mandible in the European water vole, Arvicola terrestris (Linnaeus, 1758). The research material included 597 specimens from different geographic areas: Austria, Bulgaria, Germany, Spain, Switzerland, the Czech Republic, Hungary and Slovakia. The material originates from various museum collections. Because of the extraordinary plasticity of the European water vole, the largest European vole species in Europe, there are significant interpopulation variations in its body size and shape. The aim of this master’s thesis was to determine, by means of geometric morphometrics, whether there are differences in the size and shape of the jawbone (mandible) between animals from different geographic areas, and to evaluate differences between the sexes. After determining thirteen landmarks on mandibles, the univariate and multivariate analyses were conducted. The verification of differences in size and shape took place separately. Because no secondary sexual dimorphism was detected, both genders were considered together in the continuation of the study. Three distinct size classes within the Arvicola terrestris species were identified when examining the geographic variability in the size of the mandible. The smallest class included the mandibles of all specimens from Austria and most specimens from Switzerland whereas specimens caught in the territory of Bulgaria, Hungary and Germany had the largest mandibles. The material from Spain was the most distinct and comprised nine specimens belonging to the species Arvicola sapidus. The analysis of the geographic variability in the shape of the mandible also showed differences. They were detected both in the front molar region as well as in the ramus with three processes. The whole mandible thus becomes shorter and more compact. Seven geographically corresponding groups were identified in the cluster analysis based on shape.
Keywords:	European water vole, Arvicola terrestris, jawbone, mandible, landmark, geometric morphometrics, secondary sexual dimorphism, geographic variability

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