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Endocrine programmed development and reproduction in Nereis.

General and Comparative Endocrinology

|December 1, 1983

Summary

Cerebral endocrine activity in Nereis diversicolor regulates gametogenesis and maturation. A single hormone controls growth and maturation, with secretion levels changing throughout the life cycle.

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Area of Science:

Marine biology
Endocrinology
Invertebrate reproduction

Background:

Nereis diversicolor, a marine annelid, exhibits complex reproductive cycles.
Cerebral endocrine activity plays a crucial role in regulating life cycle events in invertebrates.
Understanding the neuroendocrine control of reproduction is vital for marine invertebrate biology.

Purpose of the Study:

To characterize the pattern of cerebral endocrine activity during gametogenesis in Nereis diversicolor.
To investigate the role of cerebral hormone(s) in regulating growth, maturation, and reproduction.
To assay the specific activities of the cerebral hormone, including regeneration-promoting, maturation-inhibiting, and gametotrophic functions.

Main Methods:

Assaying cerebral endocrine secretion through its biological activities.
Utilizing brain transplantation experiments between Nereis diversicolor at different maturity stages.
Correlating brain activity in transplanted brains with in situ secretion rates.

Main Results:

Cerebral endocrine activity remains high during most of gametogenesis, then decreases.
Reduced secretion leads to the production of gametocytes and their final maturation.
Evidence suggests a single cerebral hormone mediates growth and maturation via sequential threshold activation.

Conclusions:

Cerebral endocrine activity in Nereis diversicolor is tightly regulated throughout its life cycle.
A single neurohormone likely controls the ordered sequence of growth and reproductive maturation.
The study provides insights into the endocrine mechanisms governing invertebrate reproduction and development.

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