magistrsko delo
Barbara Stupan (Avtor), Tina Klenovšek (Mentor), Boris Kryštufek (Komentor)

Povzetek

V magistrskem delu smo preučevali ontogenetski razvoj spodnje čeljustnice velikega hrčka, Cricetus cricetus (Linnaeus, 1758). Z geometrijsko morfometrijo smo analizirali 123 spodnjih čeljustnic, ki smo jim določili 16 opornih točk.Primerjali smo razlike v velikosti in obliki spodnjih čeljustnic med spoloma ter starostnimi razredi. Spodnja čeljustnica je rasla vse življenje. Rast je bila najbolj intenzivna do 60. dneva starosti, nato pa se je do 200. dne starosti postopoma upočasnjevala, vendar ne ustavila. Potrdili smo, da imajo samci večjo spodnjo čeljustnico. Razlike so se pojavile pri 120. dnevu starosti in so trajale do 4. leta življenja. V tem starostnem obdobju razlike niso bile več statistično značilne. Spolni dimorfizem v obliki spodnje čeljustnice smo potrdili v starostnih razredih 40 in 150 dni ter v 2. in 3. letu življenja. Med ontogenetskim razvojem se je spreminjala oblika spodnje čeljustnice. Največja razlika je bila med najmlajšimi osebki, ki so bili stari manj kot 30 dni, in najstarejšimi osebki v 4. letu življenja. Najizrazitejše spremembe med ontogenetskim razvojem so bile odebelitev čeljustne veje in podaljškov ter dvig kočnikov. Spodnja čeljustnica raste alometrično, kar ohranja njeno funkcionalnost. Spremembe v obliki so ključne med prehodom iz sesanja na samostojno hranjenje.

Ključne besede

magistrska dela;veliki hrček;spodnja čeljustnica;spolni dimorfizem;ontogenija;geometrijska morfometrija;

Podatki

Jezik: Slovenski jezik
Leto izida:
Tipologija: 2.09 - Magistrsko delo
Organizacija: UM FNM - Fakulteta za naravoslovje in matematiko
Založnik: [B. Stupan]
UDK: 599.323.83:591.152(043.2)
COBISS: 130169603 Povezava se bo odprla v novem oknu
Št. ogledov: 16
Št. prenosov: 4
Ocena: 0 (0 glasov)
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Ostali podatki

Sekundarni jezik: Angleški jezik
Sekundarni naslov: Ontogenetic variability of the mandible of the common hamster, Cricetus cricetus (Linnaeus, 1758)
Sekundarni povzetek: In this masters thesis we studied the ontogenetic development of the mandible of the common hamster Cricetus cricetus (Linnaeus, 1758). Using geometric morphometrics, we analysed 123 hemimandibles from the lingual side, on which we determined 16 landmarks. We compared differences in size and shape between the sexes and age classes. The mandible of the researched specimens grew whole lifetime. The growth was most intense until the 60th day of age. The mandible grew until the 200th day of age, then growth slowed down but it did not stop. We confirmed that males have larger mandibles. The differences emerged on the 120th day and lasted until the 4th year of age. In this age group, the differences were not statistically significant. We confirmed sexual dimorphism in the shape both at the age of 40 and 150 days as well as in 2nd and 3rd year of age. We confirmed that changes in the mandilble shape ocurred during the ontogenetic development. The most notable difference was between the youngest specimens that were less than 30 days old and the oldest specimens that were 4 years old. The most prominent changes during the ontogenetic development were observed in the thickening of the ramus and processes as well as in the rise of molars. The mandible grew allometrically during ontogenetic development. Certain parts grew faster, which preserved their functionality. Changes in shape were crucial during the transition from sucking to independent feeding.
Sekundarne ključne besede: master theses;common hamster;mandible;sexual dimorphism;ontogeny;geometric morphometrics;Veliki hrček (vrsta);Ontogenija;Univerzitetna in visokošolska dela;
Vrsta dela (COBISS): Magistrsko delo/naloga
Komentar na gradivo: Univ. v Mariboru, Fak. za naravoslovje in matematiko, Oddelek za biologijo
Strani: IX f., 64 str.
ID: 16783726