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Statements

Subject Item
n2:RIV%2F68081766%3A_____%2F14%3A00428869%21RIV15-GA0-68081766
rdf:type
n16:Vysledek skos:Concept
dcterms:description
In some taxa, males perform multiple ejaculations, which may function in sperm competition or in maintaining a baseline density of spermatozoa in the female reproductive tract to ensure fertilization, a process that has been termed %22topping up%22. We investigated the function of multiple ejaculations in two species of bitterling, the European bitterling (Rhodeus amarus) and Chinese rose bitterling (Rhodeus ocellatus). Bitterling oviposit in living freshwater mussels, with fertilization taking place within the mussel gill cavity. Thus, although fertilization is external, the mussel is analogous to the female reproductive tract in an internally fertilizing species. We measured the frequency of ejaculations and mussel inspections by individual males of two bitterling species in 28 replicated mesocosms and examined focal male responses to rival ejaculations and the presence of females in spawning condition. We used a model of ejaculatory behaviour to simulate the temporal abundance of spermatozoa in mussels. Male R. amarus exhibited high rates of ejaculation and inspection of the siphons of mussels and increased their ejaculation rate in response to the presence of females in spawning condition. Rhodeus ocellatus showed lower overall rates of ejaculation, but significantly elevated ejaculation rate in response to rival ejaculations. The ejaculatory strategy of R. amarus is one that maintains a minimum level of spermatozoa in mussels, which is elevated when the probability of oviposition increases. In contrast, R. ocellatus engages more directly in sperm competition with rivals. We discuss these results in the context of the function of multiple ejaculations and male mating tactics. In some taxa, males perform multiple ejaculations, which may function in sperm competition or in maintaining a baseline density of spermatozoa in the female reproductive tract to ensure fertilization, a process that has been termed %22topping up%22. We investigated the function of multiple ejaculations in two species of bitterling, the European bitterling (Rhodeus amarus) and Chinese rose bitterling (Rhodeus ocellatus). Bitterling oviposit in living freshwater mussels, with fertilization taking place within the mussel gill cavity. Thus, although fertilization is external, the mussel is analogous to the female reproductive tract in an internally fertilizing species. We measured the frequency of ejaculations and mussel inspections by individual males of two bitterling species in 28 replicated mesocosms and examined focal male responses to rival ejaculations and the presence of females in spawning condition. We used a model of ejaculatory behaviour to simulate the temporal abundance of spermatozoa in mussels. Male R. amarus exhibited high rates of ejaculation and inspection of the siphons of mussels and increased their ejaculation rate in response to the presence of females in spawning condition. Rhodeus ocellatus showed lower overall rates of ejaculation, but significantly elevated ejaculation rate in response to rival ejaculations. The ejaculatory strategy of R. amarus is one that maintains a minimum level of spermatozoa in mussels, which is elevated when the probability of oviposition increases. In contrast, R. ocellatus engages more directly in sperm competition with rivals. We discuss these results in the context of the function of multiple ejaculations and male mating tactics.
dcterms:title
The function of multiple ejaculations in bitterling The function of multiple ejaculations in bitterling
skos:prefLabel
The function of multiple ejaculations in bitterling The function of multiple ejaculations in bitterling
skos:notation
RIV/68081766:_____/14:00428869!RIV15-GA0-68081766
n3:aktivita
n11:P n11:I
n3:aktivity
I, P(GA13-05872S)
n3:cisloPeriodika
9
n3:dodaniDat
n17:2015
n3:domaciTvurceVysledku
n9:9466703 Smith, Carl Rouchet, Romain
n3:druhVysledku
n13:J
n3:duvernostUdaju
n18:S
n3:entitaPredkladatele
n7:predkladatel
n3:idSjednocenehoVysledku
17647
n3:idVysledku
RIV/68081766:_____/14:00428869
n3:jazykVysledku
n12:eng
n3:klicovaSlova
Acheilognathinae; alternative mating tactics; fertilization; mating system; sneaking; sperm competition; territoriality
n3:klicoveSlovo
n5:Acheilognathinae n5:sneaking n5:alternative%20mating%20tactics n5:sperm%20competition n5:territoriality n5:mating%20system n5:fertilization
n3:kodStatuVydavatele
GB - Spojené království Velké Británie a Severního Irska
n3:kontrolniKodProRIV
[A54F032AB35C]
n3:nazevZdroje
Journal of Evolutionary Biology
n3:obor
n10:EG
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
4
n3:projekt
n15:GA13-05872S
n3:rokUplatneniVysledku
n17:2014
n3:svazekPeriodika
27
n3:tvurceVysledku
Warren, M. Reichard, Martin Rouchet, Romain Smith, Carl
n3:wos
000341577300006
s:issn
1010-061X
s:numberOfPages
11
n4:doi
10.1111/jeb.12432