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Statements

Subject Item
n2:RIV%2F68081766%3A_____%2F13%3A00380514%21RIV14-GA0-68081766
rdf:type
skos:Concept n10:Vysledek
dcterms:description
Because sperm is costly and limiting, males are predicted to allocate sperm differentially across matings, according to the level of sperm competition, female reproductive quality, and female novelty. We investigated sperm allocation in the European bitterling (Rhodeus amarus), an externally fertilizing species of fish that spawns and incubates its eggs in the gills of freshwater mussels. We predicted that males would allocate sperm differentially according to the quality and novelty of mussels. Dominant males responded to rivals by increasing both sperm investment and aggression, whereas subordinates responded chiefly through sperm investment. Dominant males invested more sperm in novel mussels in accordance with predictions for a Coolidge effect, the mussel representing a new fertilization opportunity. However, subordinate males were not influenced by mussel novelty but were responsive to order of mating. Males did not allocate sperm according to mussel quality, suggesting that certainty of paternity is a more important variable than offspring survival in shaping bitterling sperm allocation strategies. This study demonstrates strategic ejaculate expenditure in an externally fertilizing species, analogous to that in internal fertilizers, but with sperm investment operating on the level of the site of fertilization rather than the female. Key words: ejaculate, mate choice, mating system, mussel, oviposition, sexual selection, sperm depletion. Because sperm is costly and limiting, males are predicted to allocate sperm differentially across matings, according to the level of sperm competition, female reproductive quality, and female novelty. We investigated sperm allocation in the European bitterling (Rhodeus amarus), an externally fertilizing species of fish that spawns and incubates its eggs in the gills of freshwater mussels. We predicted that males would allocate sperm differentially according to the quality and novelty of mussels. Dominant males responded to rivals by increasing both sperm investment and aggression, whereas subordinates responded chiefly through sperm investment. Dominant males invested more sperm in novel mussels in accordance with predictions for a Coolidge effect, the mussel representing a new fertilization opportunity. However, subordinate males were not influenced by mussel novelty but were responsive to order of mating. Males did not allocate sperm according to mussel quality, suggesting that certainty of paternity is a more important variable than offspring survival in shaping bitterling sperm allocation strategies. This study demonstrates strategic ejaculate expenditure in an externally fertilizing species, analogous to that in internal fertilizers, but with sperm investment operating on the level of the site of fertilization rather than the female. Key words: ejaculate, mate choice, mating system, mussel, oviposition, sexual selection, sperm depletion.
dcterms:title
Strategic sperm allocation and a Coolidge effect in an externally fertilizing species Strategic sperm allocation and a Coolidge effect in an externally fertilizing species
skos:prefLabel
Strategic sperm allocation and a Coolidge effect in an externally fertilizing species Strategic sperm allocation and a Coolidge effect in an externally fertilizing species
skos:notation
RIV/68081766:_____/13:00380514!RIV14-GA0-68081766
n10:predkladatel
n16:ico%3A68081766
n3:aktivita
n18:P n18:I
n3:aktivity
I, P(GA206/09/1163)
n3:cisloPeriodika
1
n3:dodaniDat
n17:2014
n3:domaciTvurceVysledku
n11:9466703
n3:druhVysledku
n14:J
n3:duvernostUdaju
n19:S
n3:entitaPredkladatele
n13:predkladatel
n3:idSjednocenehoVysledku
108103
n3:idVysledku
RIV/68081766:_____/13:00380514
n3:jazykVysledku
n12:eng
n3:klicovaSlova
ejaculate; mate choice; mating system; mussel; oviposition; sexual selection; sperm depletion
n3:klicoveSlovo
n4:mate%20choice n4:sperm%20depletion n4:mussel n4:ejaculate n4:mating%20system n4:sexual%20selection n4:oviposition
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[21373A3F2FB9]
n3:nazevZdroje
Behavioral Ecology
n3:obor
n5:EG
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
3
n3:projekt
n9:GA206%2F09%2F1163
n3:rokUplatneniVysledku
n17:2013
n3:svazekPeriodika
24
n3:tvurceVysledku
Smith, C. Reichard, Martin Spence, R.
n3:wos
000312431000015
s:issn
1045-2249
s:numberOfPages
7
n15:doi
10.1093/beheco/ars138