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DNA SYNTHESIS AND THE ANNUAL SPERMATOGENIC CYCLE IN INDIVIDUALS OF THE SEA STAR PATIRIA MINIATA
The Biological Bulletin
|January 10, 2018
Summary
Male sea stars (Pattiria miniata) exhibit an annual reproductive cycle, confirmed through laboratory studies. This cycle includes a dormant phase where sperm production and DNA synthesis cease.
Area of Science:
- Marine Biology
- Reproductive Biology
- Echinoderm Research
Background:
- The sea star Pattiria miniata is known to have reproductive cycles.
- Previous studies suggested an annual cycle based on field observations.
Purpose of the Study:
- To confirm the annual spermatogenic cycle in male Pattiria miniata.
- To investigate the timing of DNA synthesis and sperm production.
- To evaluate methods for studying spermatogenesis regulation.
Main Methods:
- Gonad-index and histological analyses were used for initial assessment.
- Tritiated-thymidine autoradiography was employed on sea star testes.
- Testes were surgically removed from 10 individuals every 2 months in a laboratory setting.
Main Results:
- The annual spermatogenic cycle in male P. miniata was confirmed.
- A quiescent period was identified within the cycle, characterized by no sperm production or DNA synthesis.
- Tritiated-thymidine autoradiography effectively tracked DNA synthesis during spermatogenesis.
Conclusions:
- Male Pattiria miniata possess a distinct annual spermatogenic cycle with a quiescent phase.
- Surgical sampling and tritiated-thymidine autoradiography are valuable techniques for studying reproductive biology and regeneration in sea stars.
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