20.500.12556/RUL-161088 Paritveni sistem pri pajku vrste Dolomedes plantarius Mating system in spider Dolomedes plantarius Pajki iz rodu Dolomedes so pomembni organizmi za raziskovanje evolucijskega fenomena ekstremnih paritvenih vedenj in razvoja različnih paritvenih sistemov. Znotraj tega rodu med vrstami obstajajo velike razlike v paritvenih strategijah. Samci vrste D. tenebrosus so izključno monogamni, medtem ko se samci vrst D. scriptus in D. triton parijo z več samicami. Da bi poglobili naše razumevanje razvoja paritvenih sistemov, so raziskave na bližjih sorodnih vrstah zelo pomembne. S tem namenom smo proučili paritveni sistem in spolni kanibalizem pri vrsti D. plantarius. Predpostavili smo, da bo paritveni sistem poligamen in da se bodo samci parili večkrat kot samice, da bo paritveni uspeh večjih osebkov večji in da bodo že parjene samice agresivnejše in bodo pogosteje kanibalizirale samce, predvsem če bo razlika v velikosti samca in samice velika. Opazovali smo interakcije med samicami in samci, ki smo jih večkrat izpostavili še neparjenim spolnim partnerjem. Opazili smo, da sta se oba spola parila večkrat, pri čemer so se samci v povprečju parili s 3,8 samicami, samice pa z 1,9 samci. Hkrati smo opazili, da so bile samice po prvem parjenju med dvorjenjem do samcev bolj agresivne. Agresivnost samice in verjetnost spolnega kanibalizma sta bili po parjenju pogostejši, kadar sta bila partnerja različnih velikosti. Telesna velikost statistično značilno ni vplivala na paritveni uspeh nobenega od spolov. Naša raziskava je omogočila nov vpogled v primerjalno analizo paritvenih strategij pajkov iz rodu Dolomedes in izpostavila, da je število parjenj samcev na splošno večje od števila parjenj samic, kot je to značilno za številne druge vrste s spolnim razmnoževanjem. Dolomedes spiders are central to studies investigating evolutionary phenomena like extreme mating behaviours and the diversification of mating systems. Within this genus, there is considerable variation in mating strategies between species. At one extreme, D. tenebrosus males are strictly monogynous, while at the other, D. scriptus and D. triton males mate with multiple females. To deepen our understanding of mating system evolution, more data on closely related species are essential. To that end, we studied mating system and sexual cannibalism in D. plantarius spider. We hypothesized that the mating system is polygamous, males mate more frequently than females, larger individuals have greater reproductive success, and mated females are more likely to cannibalize males, especially when the size ratio between them is smaller. We documented the interactions of females and males repeatingly exposing them to new mating partners. Our findings show that both sexes can engage in multiple matings, with males mating with an average of 3.8 females and females with 1.9 males. Additionally, our data confirm that mated females are more likely to be aggressive towards males during courtship. Female aggression towards males and the likelihood of sexual cannibalism after mating increases when the partners are of different size. However, we found no significant relationship between body size and reproductive output of either sex. This study contributes new insights to the ongoing comparative analysis of mating strategies in Dolomedes spiders, highlighting that male mating rates generally surpass those of females, a pattern commonly observed in other sexually reproducing species. Dolomedes plantarius paritveni sistem spolno vedenje spolni kanibalizem Dolomedes plantarius mating system mating behaviour sexual cannibalism true false false [Ž. Vehovar] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2024-09-07 07:15:06 2024-09-07 07:15:19 2024-09-10 04:24:02 0000-00-00 00:00:00 2024 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1970-01-01 595.441(043.2) 243633 206724099 41512.pdf 41512.pdf 1 D6A1FF15C71DA57E5823A651EA53D833 8f00038e6d6834f918dbafae6cbd5ade9e92569a7f3b2c7604dd4a9058118fe6 30d23eff-6cd8-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=189955 Biotehniška fakulteta 0 0 0