Recruitment and ontogenetic habitat shifts of the yellow snapper (<Emphasis Type="Italic">Lutjanus argentiventris</Emphasis>) in the Gulf of California |
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Authors: | Octavio Aburto-Oropeza Isaí Dominguez-Guerrero José Cota-Nieto Tomás Plomozo-Lugo |
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Institution: | 1.Departamento de Biología Marina,Universidad Autónoma de Baja California Sur,La Paz,Mexico;2.Center for Marine Biodiversity and Conservation,Scripps Institution of Oceanography,La Jolla,USA |
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Abstract: | We examined recruitment and ontogenetic habitat shifts of the yellow snapper Lutjanus argentiventris in the Gulf of California, by conducting surveys and collections in multiple mangrove sites and major marine coastal habitats
from 1998 to 2007. Over 1,167 juvenile individuals were collected and 516 otoliths were aged to describe the temporal pattern
of the settlement. L. argentiventris recruits in mangroves, where juveniles remain until they are approximately 100 mm in length or 300-days-old. Back-calculated
settlement dates and underwater surveys indicated a major recruitment peak during September and October, around 8 days before
and after the full moon. The majority of mangrove sites in the Gulf of California had a similar L. argentiventris average size at the beginning of the settlement season for the cohort of 2003; although there were significant differences
in individual sizes at the end of the nursery stage. When sub-adults leave mangroves, they live in shallow rocky reefs and
later become abundant in deeper rocky reefs. The density of migratory individuals (10–20 cm SL) decreased exponentially as
the distance between a reef and a nearby mangrove site increased. This finding has important implications for local fishery
regulations and coastal management plans. |
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