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Copulation type affects parturition in the guppy.

Aya Sato1, Arisa Shimoichi, Kenji Karino

  • 1Department of Biology, Tokyo Gakugei University, 4-1-1 Nukui-kita, Koganei, Tokyo 184-8501, Japan.

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PubMed
Summary
This summary is machine-generated.

Female guppies coerced into mating by less desirable males had lower birth rates. Brood size was unaffected by mating type, but influenced by female size and male coloration.

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Area of Science:

  • Animal behavior
  • Reproductive biology
  • Evolutionary ecology

Background:

  • Alternative mating tactics in males can compel females to mate with less desirable partners.
  • Male guppies (Poecilia reticulata) use both cooperative courtship and coercive sneaking behaviors.
  • Understanding the reproductive consequences of different mating types is crucial for evolutionary studies.

Purpose of the Study:

  • To investigate the influence of cooperative versus coercive copulation on female guppy parturition and brood size.
  • To determine if male mating tactics impact female reproductive success.

Main Methods:

  • A single mating trial was conducted per female guppy with a single male.
  • Copulation type (cooperative or coercive) was observed and recorded.
  • Parturition success and brood size were monitored post-mating.

Main Results:

  • Females coerced into mating had a significantly lower probability of parturition within 100 days.
  • Cooperative copulation and male postcopulatory jerking behavior increased parturition probability.
  • Brood size was not affected by copulation type but was positively correlated with female body size and male orange spot area.

Conclusions:

  • Coercive mating tactics by less desirable male guppies lead to reduced female reproductive success (parturition).
  • Brood size in guppies is independent of the type of copulation, being primarily influenced by female and male physical traits.
  • These findings highlight the differential reproductive outcomes associated with male mating strategies.