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Related Experiment Video

Updated: Jul 11, 2026

Measurement of Lifespan in Drosophila melanogaster

Measurement of Lifespan in Drosophila melanogaster

Published on: January 7, 2013

Size-dependent mortality induces life-history changes mediated through population dynamical feedbacks.

Tobias van Kooten¹, Lennart Persson, André M de Roos

¹Department of Ecology and Environmental Science, Umea University, S-901 87 Umea, Sweden. tobias.v.kooten@emg.umu.se

The American Naturalist

|September 18, 2007

Summary

Individual growth and size-dependent mortality significantly impact life history and population dynamics. Responses vary between species, affecting resource competition and leading to phenomena like population stabilization or the emergence of cannibalistic giants.

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Area of Science:

Ecology
Evolutionary Biology
Population Dynamics

Background:

Organismal growth during life history leads to size- and stage-dependent ecological roles.
Ontogenetic changes in mortality interact with resource-dependent growth, influencing intraspecific competition.
Size-dependent mortality critically affects life history trajectories and population dynamics.

Purpose of the Study:

To investigate how varying size-dependent mortality influences life history and population dynamics.
To compare these effects across two distinct life-history strategies: continuous resource feeding versus cannibalism.
To understand the mechanistic links between individual growth, mortality, and population-level outcomes.

Main Methods:

Modeling size-dependent mortality effects on two life-history types.
Analyzing compensatory life-history responses to mortality variations.
Examining impacts on population dynamics, including stability and growth patterns.

Main Results:

Certain size-dependent mortality patterns are buffered by life-history compensatory responses.
Other mortality patterns induce substantial shifts in life history and population dynamics.
Significant differences in responses were observed between the two life-history types studied.
Observed outcomes include population (de-)stabilization and the evolution of large cannibalistic individuals.

Conclusions:

Size-dependent mortality, mediated by resource dependence, mechanistically drives population-level effects.
Life-history evolution and population dynamics are intricately linked through ontogenetic changes in mortality.
Cannibalism as a life-history strategy presents unique population dynamics under size-dependent mortality pressures.