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Related Experiment Video

Updated: Sep 15, 2025

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Increased Breeding Frequency Mitigates Inbreeding Depression in Peromyscus in Captivity.

Kim-Tuyen Huynh-Dam1, Celia Jaeger2, Angeliki Tsomos1

  • 1Department of Drug Discovery and Biomedical Sciences, College of Pharmacy University of South Carolina Columbia South Carolina USA.

Ecology and Evolution
|July 14, 2025
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Summary

Inbreeding in Peromyscus maniculatus colonies reduces offspring survival. However, adaptive changes in mating intervals increased litter production, maintaining viable offspring numbers and colony stability.

Keywords:
Peromyscusbreeding frequencybreeding performanceclosed colonydeer miceinbredinbreeding depression

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Area of Science:

  • * Population genetics
  • * Animal behavior
  • * Conservation biology

Background:

  • * Increased parental relatedness, or inbreeding, is common in small wild and captive populations.
  • * Inbreeding typically reduces offspring fitness due to inbreeding depression.
  • * Long-term breeding data from a Peromyscus maniculatus colony is available.

Purpose of the Study:

  • * To evaluate the breeding performance and effects of inbreeding in a captive Peromyscus maniculatus colony.
  • * To investigate adaptive responses that may mitigate inbreeding depression.
  • * To understand the reproductive strategies influencing colony stability.

Main Methods:

  • * Analysis of long-term breeding records from a closed Peromyscus maniculatus colony.
  • * Kinship calculations to assess parental relatedness.
  • * Evaluation of offspring loss and litter production in relation to relatedness.

Main Results:

  • * Increased parental relatedness correlated with offspring loss, consistent with inbreeding depression.
  • * An adaptive response was observed: higher relatedness led to increased litter production.
  • * The overall number of viable offspring remained unaffected despite increased relatedness.

Conclusions:

  • * Inbreeding depression negatively impacts offspring fitness in Peromyscus maniculatus.
  • * Adaptive changes in reproductive strategy, specifically mating intervals, can partially alleviate inbreeding consequences.
  • * These findings highlight the role of behavioral plasticity in maintaining population stability under inbreeding pressure.