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Assessing Differences in Sperm Competitive Ability in Drosophila
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Individual differences in reproductive costs examined using multi-state methods.

Kelly Moyes1, Byron Morgan, Alison Morris

  • 1Institute of Mathematics, Statistics and Actuarial Science, University of Kent, Canterbury, Kent, CT2 7NF, UK. kellymoyes@googlemail.com

The Journal of Animal Ecology
|December 25, 2010
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Summary
This summary is machine-generated.

Reproductive costs in red deer vary by individual and age. Frequent reproduction lowers costs for females, while older individuals face higher costs, highlighting individual quality in life-history trade-offs.

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Animal Behavior

Background:

  • Life-history traits involve trade-offs due to limited resources.
  • Reproductive costs are often assumed to reduce survival and fecundity.
  • Positive correlations between life-history traits are frequently observed.

Purpose of the Study:

  • To examine how reproductive costs vary among individual red deer.
  • To investigate age-related differences in reproductive costs.
  • To analyze life-history strategies using multi-state mark-recapture models.

Main Methods:

  • Utilized an individual-based data set of red deer on the Isle of Rum.
  • Employed multi-state mark-recapture methodology.
  • Analyzed survival and reproductive patterns over time.

Main Results:

  • Females with frequent past reproduction incurred lower survival costs.
  • Frequent reproducers were more likely to reproduce in consecutive years.
  • Older individuals and infrequent reproducers exhibited higher reproductive costs.

Conclusions:

  • Individual quality and heterogeneity are crucial for understanding life-history trade-offs.
  • Detailed, long-term data are effective for exploring life-history strategies.
  • Reproductive costs are context-dependent and vary significantly among individuals.