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Abstract
We evaluated the population characteristics of Dardanus insignis, focusing on the reproductive period, juvenile recruitment, sexual maturity, growth and longevity of the species. Samples were collected monthly over two years (1998 and 1999), by trawling, in a subtropical region of Brazil. The hermit crabs were counted by demographic group, weighed and measured for cephalothoracic shield length, and their gonadal stage was identified using a stereo microscope. A total of 3169 hermit crabs were captured (1838 males and 1331 females). Ovigerous females were found from September to March; juvenile recruitment occurred throughout the year, peaking in summer. Males reached sexual maturity at larger sizes than females (cephalothoracic shield length = 4.4 and 4.1 mm, respectively). Longevity was estimated at 6.9 years for males and 4.3 years for females. The seasonal reproductive strategy, sexual maturity at similar sizes for males and females, continuous recruitment and differential growth are basic factors in the establishment and maintenance of the high abundance of D. insignis compared with other hermit crab species in the same region.
Acknowledgements
We are very much indebted to our NEBECC co-workers for their help during the fieldwork, to Dr Janet W. Reid (JWR Associates, New York) for her valuable help with English language and editing, and to anonymous reviewers who contributed significantly to the successful presentation of this study. All sampling in this study has been conducted in compliance with applicable state and federal laws.
Funding
We are grateful to the São Paulo Research Foundation (FAPESP) (1997/12107-0) for providing financial support.
Editorial responsibility: Roy Kropp