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Related Experiment Video

Updated: Jun 5, 2026

Probing the Limits of Egg Recognition Using Egg Rejection Experiments Along Phenotypic Gradients

Probing the Limits of Egg Recognition Using Egg Rejection Experiments Along Phenotypic Gradients

Published on: August 22, 2018

Why don't birds lay more eggs?

P Monaghan¹, R G Nager

¹Applied Ornithology Unit, Division of Environmental and Evolutionary Biology, Graham Kerr Building, University of Glasgow, Glasgow, UK G12 8QQ.

Trends in Ecology & Evolution

|January 18, 2011

Summary

This summary is machine-generated.

David Lack's hypothesis on avian clutch size needs updating. New research suggests egg-laying and incubation demands, often ignored, impact parental fitness and future reproduction.

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Area of Science:

Evolutionary biology
Life-history theory
Avian reproduction

Background:

David Lack's hypothesis posits avian clutch size is limited by parental food provisioning capacity.
Brood manipulation studies indicate birds can raise more young than eggs laid.
Recent research highlights the fitness costs of egg-laying and incubation, often excluded from experiments.

Purpose of the Study:

To re-evaluate David Lack's hypothesis in light of current research.
To incorporate the full reproductive effort, including egg production and incubation, into life-history models.
To understand the complete demands on parental fitness in avian reproduction.

Main Methods:

Review of existing literature on avian clutch size and parental investment.
Analysis of experimental data from brood manipulation studies.
Theoretical modeling to incorporate egg-laying and incubation costs.

Main Results:

Parental fitness is affected by demands beyond just feeding offspring.
Egg-laying and incubation impose significant energetic costs on parents.
Previous tests of Lack's hypothesis may have underestimated the total reproductive burden.

Conclusions:

Lack's hypothesis requires expansion to include the full spectrum of reproductive effort.
A comprehensive understanding of avian life-history requires considering all parental costs.
Future research should integrate egg production and incubation into studies of reproductive strategies.