Abstract
A photoperiod regime 6 mo out of phase between December 1978 and August 1980 resulted in gametogenesis, gonadal growth, and spawning in laboratory-maintained sea stars [Pisaster ochraceus (Brandt)] 6 mo out of phase with individuals in the field or laboratory on normal celestial photoperiods at Santa Cruz, California (USA). The seasonal fluctuation of pyloric cecum size also was shifted when the sea stars were held on the out-of-phase photoperiod regime. Phase shift of all these events was evident within 6 to 9 mo. Long daylengths (or short nightlengths) in spring and summer apparently synchronize or entrain the initiaion of gametogenesis and gonadal growth in fall.
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Communicated by N. D. Holland, La Jolla
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Pearse, J.S., Eernisse, D.J. Photoperiodic regulation of gametogenesis and gonadal growth in the sea star Pisaster ochraceus . Marine Biology 67, 121–125 (1982). https://doi.org/10.1007/BF00401277
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DOI: https://doi.org/10.1007/BF00401277