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Hit pause: Developmental arrest in annual killifishes and their close relatives
Karen L M Martin1, Jason E Podrabsky2
1Department of Biology, Pepperdine University, Malibu, California.
Summary
Killifishes survive extreme environments using dormancy states like diapause and quiescence. Understanding these developmental delays is crucial for ecological and evolutionary context.
Area of Science:
- Developmental Biology
- Ecology
- Evolutionary Biology
Background:
- Killifishes inhabit extreme environments, utilizing both aquatic and terrestrial habitats.
- Annual killifishes survive ephemeral water bodies via drought-tolerant embryos.
- Environmental stresses necessitate adaptations for survival and development.
Purpose of the Study:
- To review the unique characteristics of distinct developmental delays in killifishes.
- To clarify the different forms of dormancy (diapause and quiescence) and delayed hatching.
- To emphasize the importance of precise definitions for ecological and evolutionary understanding.
Main Methods:
- Review of existing literature on killifish developmental strategies.
- Analysis of diapause stages and quiescence in killifish life cycles.
- Comparison of diapause with delayed hatching in related species.
Main Results:
- Killifishes exhibit at least two dormancy states: diapause and quiescence.
- Three distinct stages of diapause occur during killifish embryonic development.
- Quiescence can happen at any developmental stage, and delayed hatching is distinct from diapause.
Conclusions:
- Distinct molecular mechanisms likely underlie each form of developmental delay and dormancy.
- Accurate classification of developmental dormancy is essential for ecological and evolutionary interpretation.
- Killifish adaptations provide a model for understanding survival in variable environments.