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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., et al. (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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 Creators:
Matzke, Magdalena1, Author              
Toft, Søren, Author
Bechsgaard, Jesper, Author
Pold Vilstrup, Astrid, Author
Uhl, Gabriele, Author
Künzel, Sven2, Author              
Tuni, Cristina, Author
Bilde, Trine, Author
Affiliations:
1IMPRS for Organismal Biology, Seewiesen, Max Planck Institut für Ornithologie, Max Planck Society, ou_2149699              
2Department Evolutionary Genetics, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_1445635              

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Free keywords: copulation duration, fertilization outcome, mating order, microsatellite markers, paternity, sperm competition, sperm precedence
 Abstract: 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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Language(s): eng - English
 Dates: 2022-01-262021-07-232022-02-082022-02-172022-04
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1111/mec.16405
 Degree: -

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Title: Molecular Ecology
Source Genre: Journal
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Publ. Info: Oxford : Wiley-Blackwell
Pages: - Volume / Issue: 31 (8) Sequence Number: - Start / End Page: 2435 - 2452 Identifier: ISSN: 0962-1083
CoNE: https://pure.mpg.de/cone/journals/resource/954925580119