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Predation shapes sperm performance surfaces in guppies.

Alessandro Devigili1, Jonathan P Evans2, John L Fitzpatrick1

  • 11 Department of Zoology, Stockholm University , Svante Arrhenius väg 18B, 10691 Stockholm , Sweden.

Proceedings. Biological Sciences
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PubMed
Summary
This summary is machine-generated.

Predation levels influence sperm swimming speed in guppies by altering the interplay between ornaments and sperm morphology. This highlights how ecological factors shape the evolution of sperm velocity.

Keywords:
ejaculate qualitymultivariate selection analysespostcopulatory sexual selectiontrade-off

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Area of Science:

  • Evolutionary Biology
  • Animal Behavior
  • Reproductive Ecology

Background:

  • Sperm velocity is crucial for fertilization success and is expected to evolve under sperm competition.
  • Ecological factors, such as predation, can influence sperm competition and constrain evolutionary responses in sperm velocity.
  • Understanding these ecological influences is vital for predicting evolutionary trajectories of reproductive traits.

Purpose of the Study:

  • To investigate how predation levels shape sperm swimming speed in Trinidadian guppies (Poecilia reticulata).
  • To analyze the influence of predation on the relationship between sperm velocity and correlated pre- and postcopulatory traits.
  • To explore the complex, nonlinear interactions among traits influencing sperm performance under varying ecological conditions.

Main Methods:

  • Utilized performance analysis, a multivariate statistical approach, to assess sperm velocity.
  • Examined 18 Trinidadian guppy populations across a gradient of predation levels.
  • Accounted for correlated pre- and postcopulatory traits influenced by predation.

Main Results:

  • Predation significantly affects the combination of pre- and postcopulatory traits predicting sperm performance.
  • Disruptive relationships were observed between sperm performance and combinations of ornaments and sperm morphology.
  • The specific traits predicting sperm velocity varied depending on the predation level.

Conclusions:

  • Ecological factors, like predation, critically influence the evolution of sperm velocity.
  • Complex, nonlinear interactions among traits determine sperm performance, modulated by environmental conditions.
  • Results have broad applicability to understanding trait evolution in ecologically variable systems.