Abstract:
:Although many sharks begin their life confined in nursery habitats, it is unknown how rapidly they disperse away from their natal area once they leave the nursery. We examine this issue in immature lemon sharks (Negaprion brevirostris) from the time they leave the nursery (approximately age 3) at a subtropical island (Bimini, Bahamas), through to the onset of sexual maturity (approximately age 12). From 1995 to 2007 we tagged and genotyped a large fraction of the nursery-bound sharks at this location (0-3 years of age, N = 1776 individuals). From 2003 to 2007 we sampled immature sharks aged from 3 to 11 years (N = 150) living around the island and used physical/genetic tag recaptures coupled with kinship analysis to determine whether or not each of these 'large immature sharks' was locally born. We show that many island-born lemon sharks remain close to their natal area for long periods (years) after leaving the nursery; more than half of the sampled sharks up to 135 cm total length ( approximately 6 years old) were locally born. The fraction of locally born sharks gradually declined with increasing shark size, indicating that dispersal is relatively slow and does not primarily occur after sharks reach a threshold size. Local conservation measures (e.g. localized fishery closures, marine protected areas) can therefore help protect island-born lemon sharks even after they leave the nursery habitat.
journal_name
Mol Ecoljournal_title
Molecular ecologyauthors
Chapman DD,Babcock EA,Gruber SH,Dibattista JD,Franks BR,Kessel SA,Guttridge T,Pikitch EK,Feldheim KAdoi
10.1111/j.1365-294X.2009.04289.xsubject
Has Abstractpub_date
2009-08-01 00:00:00pages
3500-7issue
16eissn
0962-1083issn
1365-294Xpii
MEC4289journal_volume
18pub_type
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