Abstract
The reproductive cycle of the large brooding seastar Leptasterias polaris Müller and Troschel was examined over an 18-month period in the St. Lawrence Estuary, Québec, Canada. There is a distinct annual cycle with spawning over several months in the autumn. The female has an unusual cycle in that the ovary only slightly decreases in size during spawning, and the size structure of the oocyte population is remarkably stable throughout the year. The major annual change observed in the oocyte population is the development of a small number of 600-to 800-μ oocytes prior to spawning and their loss during spawning. This stability, combined with the lack of evidence of phagocytosis, suggests that oocyte development takes place over many years. By contrast, the developmental cycle of the testis is similar to that of most echinoderms. The large reservoir of oocytes probably guarantees a steady annual recruitment, and brooding during the winter probably minimizes metabolic costs for the female and ensures the release of the juveniles when conditions are favourable in the spring and summer.
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Communicated by R. W. Doyle, Halifax
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Boivin, Y., Larrivée, D. & Himmelman, J.H. Reproductive cycle of the subarctic brooding asteroid Leptasterias polaris . Marine Biology 92, 329–337 (1986). https://doi.org/10.1007/BF00392673
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DOI: https://doi.org/10.1007/BF00392673