Dednost telesne velikosti pri pajku Nephilingis cruentata

Šet, Janko (author), Kralj Fišer, Simona (mentor), Gregorič, Matjaž (comentor)

V magistrski nalogi smo raziskovali intralokusni spolni konflikt, kot pomemben vidik evolucije velikostnega spolnega dimorfizma.. Opravili smo preliminarno raziskavo z nekaj sto osebki pajkov vrste Nephilingis cruentata iz družine Nephilidae, kot del obsežnejše raziskave znotrajlokusnega spolnega konflikta omenjene vrste, ki poteka na Biološkem inštitutu Jovana Hadžija. Osebke smo gojili v kontroliranih pogojih, kot mero njihove velikosti smo uporabili njihovo maso. Naši rezultati kažejo, da so samice v povprečju 73-krat težje od samcev, njihova velikost pa je močno povezana tako z genetsko predispozicijo kot tudi z materinskimi učinki. Velikost samcev je za razliko od samic odvisna predvsem od materinskih učinkov. Ocenjena vrednost medspolne genetske korelacije približno 0 nakazuje, da je intralokusni spolni konflikt velikosti osebkov vrste N. cruentata razrešen, kar omogoča nadaljno neodvisno evolucijo velikosti posameznih spolov. Naši rezultati se skladajo z dosedanjimi ugotovitvami, ki kažejo, da se je razmerje velikosti samcev in samic predstavnikov družine Nephilidae tekom evolucijske zgodovine že večkrat spremenilo.

• Language: Slovenian
• Keywords: Nephilidae, Nephilingis cruentata, velikostni spolni dimorfizem, dedovanje velikosti, intralokusni spolni konflikt
• Work type: Master's thesis/paper
• Organization: BF - Biotechnical Faculty
• Year: 2020
• PID: 20.500.12556/RUL-120644
• COBISS.SI-ID: 34759939
• Publication date in RUL: 24.09.2020

Secondary language

• Language: English
• Title: Bodysize heritability of Nephilingis cruentata

Abstract

We examined intra-locus sexual conflict as an important aspect of evolution of sexual size dimorphism. The study included a few hundred individuals of a spider species Nephilengis cruentata (fam. Nephiliidae) and represents a preliminary study of a bigger survey of intra-locus sexual conflict research on Nephilingis cruentata taking place in a research program of Jovan Hadži institute of biology. Specimens were kept in a controled invironment. Their mass has been used as an estimator of their size. The results showed that females were 73-fold larger than males on average. The size of females has been strongly correlated with their genetic predisposition and maternal effects, while the size of males has been almost entirely dependant on the latter. Estimated value of cross-sex genetic correlation around 0 indicate resolved intra-locus sexual conflict in N. cruentata, therefore allowing future independant evolution of each sex size. Our results are in congriuty with previos studies on the filed indicating multiple changes in the ratio of the size of the sexes in the representsatives of the Nephilidae family during their evolutionary history.

• Keywords: Nephilidae, Nephilingis cruentata, sexual size dimorphism, bodysize heritability, intra-locus sexual conflict