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Related Experiment Videos

How effective are maternal effects at having effects?

Andrew P Beckerman1, Tim G Benton, Craig T Lapsley

  • 1School of Biological and Environmental Science, University of Stirling, Stirling FK9 4LA, UK. a.beckerman@sheffield.ac.uk

Proceedings. Biological Sciences
|April 18, 2006
PubMed
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Maternal effects significantly influence offspring performance. However, the competitive environment, shaped by the number of offspring, often has a greater impact than direct maternal investment in evolutionary biology and population dynamics.

Area of Science:

  • Evolutionary Biology
  • Ecology
  • Population Dynamics

Background:

  • The offspring size-number trade-off is a cornerstone of evolutionary research, linking per-offspring investment to offspring fitness.
  • Maternal variation in reproductive effort influences both per capita investment and offspring number (fecundity).
  • This variation impacts juvenile performance directly (maternal effects) and indirectly through the competitive environment.

Purpose of the Study:

  • To quantify the relative contributions of maternal effects and the competitive environment to offspring performance variation.
  • To investigate the role of the offspring size-number trade-off in population dynamics.

Main Methods:

  • A factorial experiment was designed to isolate maternal effects and competitive environment influences.

Related Experiment Videos

  • Offspring performance was measured under controlled conditions.

    • Main Results:

    • Classical maternal effects were found to be significant drivers of offspring performance.
    • The competitive environment, influenced by fecundity and linked to maternal investment, exerted a more substantial effect on offspring performance in this system.

    Conclusions:

    • While direct maternal effects are important, the indirect effects mediated by the competitive environment are critical for understanding offspring performance.
    • The size-number trade-off has significant implications for population dynamics that warrant further consideration.