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Age structure, environmental fluctuations, and hermaphroditic sex allocation.
1Stanford University, CA 94305.
Heredity
|February 1, 1990
Summary
This study explores sex allocation strategies in hermaphrodites within fluctuating environments. It reveals how survival rates and environmental changes influence evolutionary stable allocation, impacting population dynamics.
Area of Science:
- Evolutionary biology
- Population dynamics
- Theoretical ecology
Background:
- Sex allocation is crucial for reproductive success in hermaphroditic species.
- Environmental fluctuations can significantly impact population dynamics and evolutionary strategies.
- Understanding evolutionary stable strategies (ESS) is key to predicting population persistence.
Purpose of the Study:
- To derive the general condition for the evolutionary stable state (ESS) of sex allocation in age-structured hermaphrodites.
- To analyze the impact of survival rate dependence on allocation within a deterministic framework.
- To identify conditions for a stochastic ESS and its dependence on demographic and vital rate correlations.
Main Methods:
- Derivation of the general ESS condition for density-independent dynamics.
- Analysis of allocation effects on survival rates.
- Investigation of stochastic ESS under environmental fluctuations.
Main Results:
- A general condition for ESS in sex allocation was derived.
- Dependence of survival rates on allocation was shown to affect the deterministic ESS.
- Conditions for a stochastic ESS, including a product rule, were identified based on demographic and vital rate structures.
Conclusions:
- Environmental fluctuations and demographic structure critically shape sex allocation strategies.
- The study provides a framework for understanding ESS in complex, age-structured populations.
- Results highlight the interplay between vital rates, environmental stochasticity, and evolutionary outcomes.