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Sophisticated sperm allocation in male fowl

Pizzari, Tommaso (author)
School of Biology, University of Leeds,Swedish University of Agricultural Sciences, Skara, Sweden
Cornwallis, Charles K. (author)
Deptartment of Animal & Plant Science, University of Sheffield
Løvlie, Hanne (author)
Stockholms universitet,Zoologiska institutionen,Etologi,Stockholm University, Sweden
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Jakobsson, Sven (author)
Stockholms universitet,Zoologiska institutionen,Etologi,Stockholm University, Sweden
Birkhead, Tim R. (author)
Deptartment of Animal & Plant Science, University of Sheffield
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 (creator_code:org_t)
Nature Publishing Group, 2003
2003
English.
In: Nature. - : Nature Publishing Group. - 0028-0836 .- 1476-4687. ; 426:6962, s. 70-74
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • When a female is sexually promiscuous, the ejaculates of different males compete for the fertilization of her eggs; the more sperm a male inseminates into a female, the more likely he is to fertilize her eggs. Because sperm production is limited and costly, theory predicts that males will strategically allocate sperm (1) according to female promiscuity, (2) saving some for copulations with new females, and (3) to females producing more and/or better offspring. Whether males allocate sperm in all of these ways is not known, particularly in birds where the collection of natural ejaculates only recently became possible. Here we demonstrate male sperm allocation of unprecedented sophistication in the fowl Gallus gallus. Males show status-dependent sperm investment in females according to the level of female promiscuity; they progressively reduce sperm investment in a particular female but, on encountering a new female, instantaneously increase their sperm investment; and they preferentially allocate sperm to females with large sexual ornaments signalling superior maternal investment. Our results indicate that female promiscuity leads to the evolution of sophisticated male sexual behaviour.

Subject headings

NATURVETENSKAP  -- Biologi (hsv//swe)
NATURAL SCIENCES  -- Biological Sciences (hsv//eng)

Keyword

sperm competition
sperm allocation
level of competition
status
female fecundity
gallus

Publication and Content Type

ref (subject category)
art (subject category)

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