Coral reef fish populations can persist without immigration

Salles, Océane C., Maynard, Jeffrey A., Joannides, Marc, Barbu, Corentin M., Saenz-Agudelo, Pablo, Almany, Glenn R., Berumen, Michael L., Thorrold, Simon R., Jones, Geoffrey P., and Planes, Serge (2015) Coral reef fish populations can persist without immigration. Proceedings of the Royal Society of London Series B, Biological Sciences, 282 (1819). pp. 1-9.

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View at Publisher Website: http://dx.doi.org/10.1098/rspb.2015.1311
 
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Abstract

Determining the conditions under which populations may persist requires accurate estimates of demographic parameters, including immigration, local reproductive success, and mortality rates. In marine populations, empirical estimates of these parameters are rare, due at least in part to the pelagic dispersal stage common to most marine organisms. Here, we evaluate population persistence and turnover for a population of orange downfish, Amphiprion percula, at Kimbe Island in Papua New Guinea. All fish in the population were sampled and genotyped on five occasions at 2-year intervals spanning eight years. The genetic data enabled estimates of reproductive success retained in the same population (reproductive success to self-recruitment), reproductive success exported to other subpopulations (reproductive success to local connectivity), and immigration and mortality rates of sub-adults and adults. Approximately 50% of the recruits were assigned to parents from the Kimbe Island population and this was stable through the sampling period. Stability in the proportion of local and immigrant settlers is likely due to: low annual mortality rates and stable egg production rates, and the short larval stages and sensory capacities of reef fish larvae. Biannual mortality rates ranged from 0.09 to 0.55 and varied significantly spatially. We used these data to parametrize a model that estimated the probability of the Kimbe Island population persisting in the absence of immigration. The Kimbe Island population was found to persist without significant immigration. Model results suggest the island population persists because the largest of the subpopulations are maintained due to having low mortality and high self-recruitment rates. Our results enable managers to appropriately target and scale actions to maximize persistence likelihood as disturbance frequencies increase.

Item ID: 42667
Item Type: Article (Research - C1)
ISSN: 1471-2954
Keywords: Amphiprion percula, long-term monitoring, parentage analysis, self-recruitment, population demography, persistence
Funders: LABEX CORAIL, European Research Council (ERC), GEF CRTR Connectivity Working Group, National Science Foundation (USA), ARC CoE for Coral Reef Studies, Nature Conservancy, TOTAL Foundation, James Cook University, KAUST, Woods Hole Oceanographic Institution
Date Deposited: 10 Feb 2016 07:39
FoR Codes: 06 BIOLOGICAL SCIENCES > 0604 Genetics > 060411 Population, Ecological and Evolutionary Genetics @ 33%
06 BIOLOGICAL SCIENCES > 0602 Ecology > 060207 Population Ecology @ 34%
06 BIOLOGICAL SCIENCES > 0603 Evolutionary Biology > 060308 Life Histories @ 33%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960808 Marine Flora, Fauna and Biodiversity @ 100%
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