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  Sperm competition intensity affects sperm precedence patterns in a polyandrous gift-giving spider

Matzke, M., Toft, S., Bechsgaard, J., Pold Vilstrup, A., Uhl, G., Künzel, S., Tuni, C., & Bilde, T. (2022). Sperm competition intensity affects sperm precedence patterns in a polyandrous gift-giving spider. Molecular Ecology, 31(8), 2435-2452. doi:10.1111/mec.16405.

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アイテムのパーマリンク: https://hdl.handle.net/21.11116/0000-000A-9BAC-6 版のパーマリンク: https://hdl.handle.net/21.11116/0000-000D-2BC8-2
資料種別: 学術論文

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 作成者:
Matzke, Magdalena1, 2, 3, 4, 著者           
Toft, Søren, 著者
Bechsgaard, Jesper, 著者
Pold Vilstrup, Astrid, 著者
Uhl, Gabriele, 著者
Künzel, Sven, 著者
Tuni, Cristina, 著者
Bilde, Trine, 著者
所属:
1IMPRS-BI: Seewiesen, Seewiesen, Max Planck Institut für Ornithologie, Max Planck Society, ou_3510607              
2LMU München, ou_persistent22              
3IMPRS for Organismal Biology, Seewiesen, Max Planck Institut für Ornithologie, Max Planck Society, ou_2149699              
4IMPRS-LS: Seewiesen, Seewiesen, Max Planck Institut für Ornithologie, Max Planck Society, ou_3481944              

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キーワード: copulation duration, fertilization outcome, mating order, microsatellite markers, paternity, sperm competition, sperm precedence
 要旨: Abstract Sperm competition drives traits that enhance fertilization success. The amount of sperm transferred relative to competitors is key for attaining paternity. Female reproductive morphology and male mating order may also influence fertilization, however the outcome for sperm precedence under intense sperm competition remains poorly understood. In the polyandrous spider Pisaura mirabilis, males offer nuptial gifts which prolong copulation and increase sperm transfer, factors proposed to alter sperm precedence patterns under strong sperm competition. First, we assessed the degree of female polyandry by genotyping wild broods. A conservative analysis identified up to four sires, with a mean of two sires per brood, consistent with an optimal mating female rate. Then we asked whether intense sperm competition shifts sperm precedence patterns from first male priority, as expected from female morphology, to last male advantage. We varied sexual selection intensity experimentally and determined competitive fertilization outcome by genotyping broods. In double matings, one male monopolised paternity regardless of mating order. A mating order effect with first male priority was revealed when females were mated to four males, however this effect disappeared when females were mated to six males, probably due to increased sperm mixing. The proportion of males that successfully sired offspring drastically decreased with the number of competitors. Longer copulations translated into higher paternity shares independently of mating order, reinforcing the advantage of traits that prolong copulation duration under intense competition, such as the nuptial gift. Sperm competition intensity enhances the impact of competitive sexual traits and imposes multiple effects on paternity.

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言語: eng - English
 日付: 2022-04-01
 出版の状態: 出版
 ページ: -
 出版情報: -
 目次: -
 査読: -
 識別子(DOI, ISBNなど): DOI: 10.1111/mec.16405
その他: Immediate Open Access
 学位: -

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出版物 1

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出版物名: Molecular Ecology
種別: 学術雑誌
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出版社, 出版地: Oxford : Wiley-Blackwell
ページ: - 巻号: 31 (8) 通巻号: - 開始・終了ページ: 2435 - 2452 識別子(ISBN, ISSN, DOIなど): ISSN: 0962-1083
CoNE: https://pure.mpg.de/cone/journals/resource/954925580119