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The offspring-development-time/offspring-number trade-off.
Juan Bueno1, Ángel López-Urrutia
1Instituto Español de Oceanografía-Centro Oceanográfico de Gijón, Avenida Príncipe de Asturias, 70 bis, E-33212 Gijón, Spain.
The American Naturalist
|May 24, 2012
Summary
Integrating metabolic and life-history theories, this study reveals offspring development time depends on maternal investment and metabolic constraints. Organisms producing more offspring experience shorter development times due to metabolic and evolutionary trade-offs.
Area of Science:
- Ecology
- Evolutionary Biology
- Thermodynamics
Background:
- The Metabolic Theory of Ecology (MTE) posits that metabolic rate, influenced by mass and temperature, governs biological rates.
- Life-History Optimization (LHO) theories propose that evolutionary processes shape biological traits.
- A synthetic ecological theory can emerge from integrating MTE and LHO.
Purpose of the Study:
- To link MTE and LHO to model offspring development time.
- To investigate how maternal investment and metabolic constraints influence offspring growth and development.
- To explore the trade-offs between offspring size, number, and development time.
Main Methods:
- Formulated a model integrating MTE and LHO principles.
- Extended the offspring size-number trade-off to ectotherms.
- Combined the trade-off with an ontogenetic growth model.
Main Results:
- Offspring development time is determined by maternal investment and offspring metabolic constraints.
- Increased body temperatures in ectotherms enhance resources for reproduction.
- A trade-off exists between offspring number and development time, predicting shorter development for larger broods.
Conclusions:
- The study successfully integrates MTE and LHO to explain offspring development time.
- Maternal investment and metabolic constraints are key drivers of offspring development.
- Evolutionary strategies influence the trade-off between offspring quantity and development duration.
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