Ontogenetski vidik modularne organizacije lobanje velikega hrčka, Cricetus cricetus (Linnaeus, 1758) : Magistrsko delo

Šoštar Pirš, Nuša

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Title:	Ontogenetski vidik modularne organizacije lobanje velikega hrčka, Cricetus cricetus (Linnaeus, 1758) : Magistrsko delo
Authors:	ID Šoštar Pirš, Nuša (Author) ID Klenovšek, Tina (Mentor) More about this mentor...
Files:	MAG_Sostar_Pirs_Nusa_2024.pdf (3,90 MB) MD5: 8561FF3FCE607FF854F2A083A4E07D9B
Language:	Slovenian
Work type:	Master's thesis/paper
Typology:	2.09 - Master's Thesis
Organization:	FNM - Faculty of Natural Sciences and Mathematics
Abstract:	Analizirali smo modularno organizacijo in stopnjo integracije lobanje velikega hrčka, Cricetus cricetus, z vidika ontogenetskega razvoja. Raziskavo smo izvedli na ventralni strani 127 lobanj, in sicer z metodami geometrijske morfometrije, pri čemer smo upoštevali vpliv alometrije in spolnega dimorfizma. Modularnost smo testirali na osnovi Escoufierjevega RV koeficienta. Rezultati so pokazali, da so lobanje samcev velikega hrčka nekoliko večje od lobanj samic, pri čemer so se prve statistično značilne razlike v velikosti lobanje med spoloma pojavile pri 120. dnevu starosti. V splošnem je velikost lobanje alometrično naraščala s starostjo, oblika lobanje pa se je spreminjala skladno z rastjo. Razlike v obliki lobanje med spoloma so se pojavile pri 150. dnevu starosti in naraščale s starostjo, zato smo osebke od 150. dneva starosti dalje analizirali ločeno po spolih. Delitev lobanje na obrazni in možganski del smo potrdili tako pri mladih in mladostnih kot tudi pri odraslih osebkih, pri čemer se z višanjem starosti manjša povezanost hipotetičnih modulov, torej ima lobanja s staranjem osebkov manjšo stopnjo integracije oz. večjo stopnjo modularnosti. To je skladno s pričakovanji, saj se funkcionalni moduli pri mladih in mladostnih osebkih še razvijajo, medtem ko so pri odraslih osebkih le-ti že izoblikovani. Pri ločeni analizi za spol smo hipotezo o modularnosti potrdili tako pri samcih kot samicah od 2. do 4. leta starosti. Podobne rezultate smo dobili tako pri analizi cele kot polovice lobanje. Modularnost smo analizirali tudi po izločitvi vpliva alometrije in jo potrdili pri odraslih osebkih. Alometrija je bila močan integracijski faktor, saj je bil RV koeficient po izločitvi vpliva alometrije izrazito nižji in delitev na dva modula bolj izrazita.
Keywords:	geometrijska morfometrija, ontogenija, lobanja, RV koeficient, spolni dimorfizem, alometrija, integracija, Cricetus cricetus
Place of publishing:	Maribor
Place of performance:	Maribor
Publisher:	[N. Šostar Pirš]
Year of publishing:	2024
Number of pages:	X, 72 str.
PID:	20.500.12556/DKUM-91208
UDC:	599.323.83:591.152(043.2)
COBISS.SI-ID:	220079875
Publication date in DKUM:	20.12.2024
Views:	165
Downloads:	46
Metadata:
Categories:	FNM
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Licences

License:	CC BY 4.0, Creative Commons Attribution 4.0 International

Link:	http://creativecommons.org/licenses/by/4.0/
Description:	This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

Language:	English
Title:	Ontogenetic Aspect of the Modular Organization of the Skull of the Common Hamster, Cricetus cricetus (Linnaeus, 1758)
Abstract:	We analyzed the modular organization and degree of integration of the skull of the common hamster, Cricetus cricetus, from the perspective of ontogenetic development. The study was performed on the ventral side of 127 skulls using geometric morphometric methods, taking into account the effects of allometry and sexual dimorphism. Modularity was tested based on the Escoufier RV coefficient. The results showed that male hamsters had slightly larger skulls than females, with the first statistically significant differences in skull size between sexes occurring on day 120 of age. In general, skull size increased allometrically with age and skull shape changed in accordance with growth. Differences in skull shape between sexes appeared at 150 days of age and increased with age, which is why we analyzed specimens separately by sex from 150 days of age onward. The division of the skull into facial and cranial parts was confirmed both in juvenile and subadult as well as in adult specimens. With increasing age, the connection of the hypothetical modules decreases, meaning that the skull exhibited a lower degree of integration or a higher degree of modularity as the specimens aged. This is in line with expectations, as functional modules are still developing in juvenile and subadult specimens, while they are already fully formed in adults. In a separate analysis for sex, the modularity hypothesis was confirmed in both males and females from 2 to 4 years of age. Similar results were obtained in both the analysis of the whole and half of the skull. Modularity was also analyzed after the exclusion of the influence of allometry and confirmed in adult specimens. Allometry was a strong integration factor, as the RV coefficient was markedly lower after eliminating the influence of allometry and the division into two modules was more pronounced.
Keywords:	geometric morphometrics, ontogeny, skull, RV coefficient, sexual dimorphism, allometry, integration, Cricetus cricetus

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