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POPULATION STRUCTURE AND REPRODUCTIVE PERIOD OF THE TROPICAL HERMIT CRAB CALCINUS TIBICEN (DECAPODA: DIOGENIDAE) IN THE REGION OF UBATUBA, SÃO PAULO, BRAZIL

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image of Journal of Crustacean Biology

ABSTRACT The population of the hermit crab Calcinus tibicen in the Ubatuba region was studied with emphasis on seasonal abundance, seasonal size-frequency distribution, sex-ratio, and reproductive period based on the percentage of ovigerous females. The animals were collected at 2-month intervals for 2 consecutive years (from January 1993 to November 1994). Total mean animal size in shield length was 5.14 ± 1.23 mm for males, 4.23 ± 0.79 mm for females, and 4.53 ± 0.60 for ovigerous females. A discontinuity in reproduction was observed, with an absence of ovigerous females in July (winter) and a high incidence from September to May (spring to autumn). Calcinus tibicen is sexually dimorphic in relation to size, with a higher growth rate in males. The sex-ratio pattern changes with season, indicating that it is more a function of season or habitat than of size.

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/content/journals/10.1163/193724098x00610
1998-01-01
2016-12-03

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