Seasonal anecdysis and moulting synchrony in field populations of Palaemon elegans (Rathke) |
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| Authors: | SG Webster |
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| Institution: | Department of Marine Biology, University of Liverpool, Port Erin, Isle of Man, U.K. |
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| Abstract: | A population of Palaemon elegans studied during 1978–1980 showed a characteristic moult cycle structure according to season, comprising a winter anecdysis, ‘epidemic’ spring moulting and synchrony of moult cycle development. The initiation of moulting in the spring was temperature-dependent, an estimated environmental temperature of 7–8 °C being necessary to allow moulting. Developmental synchrony during the moult cycle was observed following the initial spring moults, and it is thought that the degree and duration of moult synchrony is temperature-dependent. Synchrony is lost during the summer. Despite seasonal climatic differences between years, little difference in the time of appearance of berried females was seen. It is thought that oogenesis is controlled primarily by photoperiodic rather than temperature-dependent mechanisms. During egg development the moult cycle of ovigerous females was prolonged during intermoult stages and, during late vitellogenesis, premoult stages were prolonged. |
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| Keywords: | molting seasonal cycles synchrony temperature Palaemonidae |
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