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Germ banking: bet-hedging and variable release from egg and seed dormancy.
Margaret E K Evans1, John J Dennehy
1Department of Biology, Wesleyan University, Middletown, Connecticut 06459, USA. MARGARET.EVANS@YALE.EDU
The Quarterly Review of Biology
|March 8, 2006
Summary
Many species delay hatching or germination as a survival strategy. This unified concept, germ banking, helps explain population dynamics and biodiversity maintenance.
Area of Science:
- Ecology
- Evolutionary Biology
- Developmental Biology
Background:
- Many species exhibit delayed hatching or germination despite optimal conditions.
- Tactics like seed banking, embryonic diapause, and delayed egg hatching are observed across diverse species.
- These strategies have been studied independently, limiting cross-disciplinary understanding.
Purpose of the Study:
- To introduce and define a unifying term, "germ banking," for delayed propagule emergence.
- To connect previously disparate research fields studying similar phenomena.
- To explore the ecological and evolutionary implications of germ banking.
Main Methods:
- Literature review and synthesis of existing research on delayed hatching and germination.
- Definition and conceptualization of "germ banking."
- Analysis of biological examples to illustrate the phenomenon.
Main Results:
- Germ banking is proposed as a general term encompassing seed banking, delayed egg hatching, and embryonic diapause.
- The study delineates causes of emergence timing variation and distinguishes germ banking from optimal diapause.
- Germ banking influences population age structure, microevolutionary dynamics, and allele flow.
Conclusions:
- Germ banking is a widespread bet-hedging strategy against environmental uncertainty.
- This phenomenon plays a crucial role in maintaining genetic and species diversity.
- Germ banking promotes species coexistence and raises new questions for ecological and evolutionary research.