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    Genetic identity determines risk of post-settlement mortality of a marine fish

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    06-0066.pdf (241.3Kb)
    Date
    2007-05
    Author
    Vigliola, Laurent  Concept link
    Doherty, Peter J.  Concept link
    Meekan, Mark G.  Concept link
    Drown, Devin M.  Concept link
    Jones, M. Elizabeth  Concept link
    Barber, Paul H.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/4712
    As published
    https://doi.org/10.1890/06-0066
    DOI
    10.1890/06-0066
    Keyword
     Growth rates; Haplotypes; Larval and juvenile fish; Maternal and genetic inheritance; Mortality; mtDNA; Otoliths; Predation; Recruitment; Settlement; Size selection 
    Abstract
    Longitudinal sampling of four cohorts of Neopomacentrus filamentosus, a common tropical damselfish from Dampier Archipelago, Western Australia, revealed the evolution of size structure after settlement. Light traps collected premetamorphic individuals from the water column (“settlers”) to establish a baseline for each cohort. Subsequently, divers collected benthic juveniles (“recruits”) at 1–3-month intervals to determine the relative impacts of post-settlement mortality during the first three months. Growth trajectories for individual fish were back-calculated from otolith records and compared with nonlinear mixed-effects models. Size-selective mortality was detected in all cohorts with the loss of smaller, slower growing individuals. Three months after settlement, recruits showed significantly faster growth as juveniles, faster growth as larvae, and larger sizes as hatchlings. The timing and intensity of post-settlement selection differed among cohorts and was correlated with density at settlement. The cohort with the greatest initial abundance experienced the strongest selective mortality, with most of this mortality occurring between one and two months after settlement when juveniles began foraging at higher positions in the water column. Significant genetic structure was found between settlers and three-month-old recruits in this cohort as a result of natural selection that changed the frequency of mtDNA haplotypes measured at the control region. The extent of this genetic difference was enlarged or reduced by artificially manipulating the intensity of size-based selection, thus establishing a link between phenotype and haplotype. Sequence variation in the control region of the mitochondrial genome has been linked to mitochondrial efficiency and weight gain in other studies, which provides a plausible explanation for the patterns observed here.
    Description
    Author Posting. © Ecological Society of America, 2007. This article is posted here by permission of Ecological Society of America for personal use, not for redistribution. The definitive version was published in Ecology 88 (2007): 1263–1277, doi:10.1890/06-0066.
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    • Boston University Marine Program (BUMP)
    Suggested Citation
    Ecology 88 (2007): 1263–1277
     

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