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The Ratio of X Chromosome to Autosomes

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Related Experiment Video

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Assessing Differences in Sperm Competitive Ability in Drosophila
09:34

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Published on: August 22, 2013

Polyandry increases offspring viability and mother productivity but does not decrease mother survival in Drosophila

Patricia Adair Gowaty1, Yong-Kyu Kim, Jessica Rawlings

  • 1Department of Ecology and Evolutionary Biology and Institute of the Environment, University of California, Los Angeles, CA 90095, USA. gowaty@eeb.ucla.edu

Proceedings of the National Academy of Sciences of the United States of America
|July 21, 2010
PubMed
Summary
This summary is machine-generated.

Polyandrous mating significantly boosts female fitness in Drosophila pseudoobscura by increasing offspring survival and productivity. This study reveals polyandry enhances fitness more than repeated mating with a single male.

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Area of Science:

  • Evolutionary Biology
  • Behavioral Ecology
  • Reproductive Strategies

Background:

  • Polyandrous mating, where females mate with multiple males, is common across species.
  • The fitness benefits for females engaging in polyandry remain a subject of scientific debate.

Purpose of the Study:

  • To investigate the lifetime fitness consequences for female Drosophila pseudoobscura under different mating systems.
  • To compare the effects of single mating, repeated mating with one male, and polyandrous mating on female reproductive success and offspring viability.

Main Methods:

  • Experimental comparison of three groups of Drosophila pseudoobscura females: single copulation monogamy (MOC), multiple copulation monogamy (MMC), and polyandry (PMC).
  • Assessment of lifetime fitness components including offspring viability (egg-to-adult survival), productivity (number of adult offspring), and female lifespan.

Main Results:

  • Females experiencing multiple copulations (MMC and PMC) exhibited significantly higher offspring viability and productivity than MOC females.
  • Polyandrous females (PMC) showed enhanced offspring survival and productivity compared to monogamous females with repeated copulations (MMC), despite laying fewer eggs.
  • Female lifespan did not differ significantly across the experimental mating treatments.

Conclusions:

  • Multiple inseminations enhance both maternal and offspring fitness in Drosophila pseudoobscura.
  • Polyandrous mating provides greater fitness benefits to females than repeated mating with a single male.
  • This study provides novel insights into the lifetime costs and benefits of various mating strategies in a natural fly population.