High rates of growth recorded for hawksbill sea turtles in Anegada, British Virgin Islands
Article first published online: 13 MAR 2014
© 2014 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd.
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Ecology and Evolution
Volume 4, Issue 8, pages 1255–1266, April 2014
How to Cite
Ecology and Evolution 2014; 4(8):1255–1266
- Issue published online: 22 APR 2014
- Article first published online: 13 MAR 2014
- Manuscript Accepted: 8 FEB 2014
- Manuscript Revised: 4 FEB 2014
- Manuscript Received: 20 AUG 2013
- UK Darwin Initiative. Grant Number: 162/12/023
- Japan Bekko Association
- Streamlining of Ocean Wavefarms Impact Assesment (SOWFIA)
- Natural Environment Research Council (NERC). Grant Number: NER/S/A/2004/12980
- growth rates;
- hawksbill turtle;
- sex ratio;
- sexual maturity
Management of species of conservation concern requires knowledge of demographic parameters, such as rates of recruitment, survival, and growth. In the Caribbean, hawksbill turtles (Eretmochelys imbricata) have been historically exploited in huge numbers to satisfy trade in their shells and meat. In the present study, we estimated growth rate of juvenile hawksbill turtles around Anegada, British Virgin Islands, using capture–mark–recapture of 59 turtles over periods of up to 649 days. Turtles were recaptured up to six times, having moved up to 5.9 km from the release location. Across all sizes, turtles grew at an average rate of 9.3 cm year−1 (range 2.3–20.3 cm year−1), and gained mass at an average of 3.9 kg year−1 (range 850 g–16.1 kg year−1). Carapace length was a significant predictor of growth rate and mass gain, but there was no relationship between either variable and sea surface temperature. These are among the fastest rates of growth reported for this species, with seven turtles growing at a rate that would increase their body size by more than half per year (51–69% increase in body length). This study also demonstrates the importance of shallow water reef systems for the developmental habitat for juvenile hawksbill turtles. Although growth rates for posthatching turtles in the pelagic, and turtles larger than 61 cm, are not known for this population, the implications of this study are that Caribbean hawksbill turtles in some areas may reach body sizes suggesting sexual maturity in less time than previously considered.