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Updated: Sep 20, 2025

Author Spotlight: Exploring Microglial Interactions with Stress-Response Circuitry Using the Limited Bedding and Nesting Model
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Inbreeding reduces the ability of young to exploit high-resource nurseries.

Matthew Schrader1

  • 1Department of Biology, University of the South, Sewanee, Tennessee, United States.

Journal of Evolutionary Biology
|May 22, 2025
PubMed
Summary

In burying beetles, offspring inbreeding depression depends on nursery resource levels. Inbred larvae grew smaller in high-resource environments, unlike outbred larvae, impacting fitness.

Keywords:
Nicrophorusinbreeding depressionlarval resourcesparental care

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Area of Science:

  • Evolutionary biology
  • Behavioral ecology
  • Animal reproduction

Background:

  • Parental care environments, or nurseries, can influence offspring development and fitness.
  • While behavioral interactions in nurseries can moderate inbreeding depression, the impact of other environmental factors is less understood.

Purpose of the Study:

  • To investigate if nursery resource abundance (carcass size) affects inbreeding depression in burying beetles (Nicrophorus orbicollis).
  • To determine if inbreeding and resource levels influence parental care behaviors.

Main Methods:

  • Two experiments were conducted using Nicrophorus orbicollis.
  • Experiment 1 tested the effect of carcass size on inbreeding depression in larval mass and survival.
  • Experiment 2 examined the influence of inbreeding and carcass size on parental care.

Main Results:

  • Inbreeding depression in larval mass was dependent on resource abundance; inbred larvae were smaller in high-resource nurseries.
  • Outbred larvae showed greater responsiveness to resource abundance than inbred larvae.
  • Inbreeding depression in larval survival was independent of resource levels.
  • No evidence suggested parental behavior differences explained inbred larvae's reduced performance in high-resource nurseries.

Conclusions:

  • Inbred burying beetles are less capable of exploiting high-resource nurseries, indicating an inbreeding-by-environment interaction.
  • The mechanisms driving this interaction require further investigation.