Genetic identity determines risk of post-settlement mortality of a marine fish
Doherty, Peter J.
Meekan, Mark G.
Drown, Devin M.
Jones, M. Elizabeth
Barber, Paul H.
MetadataShow full item record
KeywordGrowth rates; Haplotypes; Larval and juvenile fish; Maternal and genetic inheritance; Mortality; mtDNA; Otoliths; Predation; Recruitment; Settlement; Size selection
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.
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.
Showing items related by title, author, creator and subject.
Causes of decoupling between larval supply and settlement and consequences for understanding recruitment and population connectivity Pineda, Jesus; Porri, Francesca; Starczak, Victoria R.; Blythe, Jonathan N. (2010-01-06)Marine broadcast spawners have two-phase life cycles, with pelagic larvae and benthic adults. Larval supply and settlement link these two phases and are crucial for the persistence of marine populations. Mainly due to ...
Pineda, Jesus; DiBacco, Claudio; Starczak, Victoria R. (2005)Late stage larvae (cyprids) of the barnacle Semibalanus balanoides frequently encounter freezing conditions along the northwest Atlantic coast. S. balanoides cyprids survived for more than 4 weeks embedded in sea ice, and ...
Zimmer, Cheryl Ann; Starczak, Victoria R.; Arch, Victoria S.; Zimmer, Richard K. (Sears Foundation for Marine Research, 2008-03)Planktonic larval settlement can be a major determinant of population and community dynamics. Settlement templates of benthic invertebrates have been attributed to biological, chemical, and hydrodynamic mechanisms. Completely ...