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Bigger is better: size-selective mortality throughout the life history of a fast-growing clupeid, Spratelloides gracilis

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dc.contributor Australian Institute Of Marine Science
dc.contributor Dept Marine Ecol
dc.contributor Sultan Qaboos University
dc.contributor Inst Biol Sci
dc.contributor Aarhus Univ
dc.contributor Dept Fisheries & Marine Sci
dc.contributor Aarhus University
dc.contributor Australian Inst Marine Sci
dc.contributor Sultan Qaboos Univ
dc.contributor Australian Institute Of Marine Science (aims) en CARLETON, J. H. MEEKAN, M. G. VIGLIOLA, L. HANSEN, A. DOHERTY, P. J. HALFORD, A. 2013-02-28T06:50:06Z 2017-03-21T01:20:34Z 2017-03-21T01:20:34Z 2019-07-08T02:24:43Z 2017-03-21T01:20:34Z 2013-02-28T06:50:06Z 2013-02-28T06:50:06Z 2019-07-08T02:24:43Z 2006-01-01
dc.identifier 7172 en
dc.identifier.citation Meekan MG, Vigliola L, Hansen A, Doherty PJ, Halford AR and Carleton JH (2006) Bigger is better: size-selective mortality throughout the life history of a fast-growing clupeid, Spratelloides gracilis. Marine Ecology Progress Series. 317: 237-244. en
dc.identifier.issn 0171-8630
dc.description.abstract A cohort of the fast-growing sprat Spratelloides gracilis was sampled during late-larval, juvenile and adult life-history phases using light traps on the North West Shelf of Western Australia. Otoliths from 154 larvae, juveniles and adults that hatched during a 20 d window were analysed to produce back-calculated daily records of size-at-age and growth rate. These traits were compared among sequential samples using repeated-measures MANOVAs (multivariate analyses of variance) to determine whether selective mortality occurred in the cohort. Late-stage larvae in our catches averaged 23 +/- 3 d of age and were 22 +/- 2 mm standard length (SL), while juveniles averaged 47 +/- 6 d of age and 36 +/- 6 mm SL. We found that individuals that survived the larval stage to become juveniles underwent strong selective mortality. This selective mortality acted to preferentially remove fish that were slow-growing and/or relatively small members of the cohort. The size variation on which this selection acted was present at hatching and propagated by growth during the larval stage. Size at hatching is principally determined by egg size, implying that maternal contributions had an important influence on the outcome of selective events. We found no evidence of selective mortality operating during the transition of juvenile sprats to adulthood. Adults averaged 78 6 d of age and 44 +/- 5 mm SL. Log-linear analyses indicated that the cohort underwent 8.6% mortality mm(-1) SL and had a daily mortality rate of 3.7% between larval and adult stages. Given an average linear growth rate of 0.96 mm d(-1) during the larval phase, this suggests that selective mortality based on size (bigger-is-better) was approximately twice as important as mortality due to age differences (stage duration) among members of the cohort.
dc.language English
dc.language en en
dc.relation.ispartof Marine Ecology Progress Series - pages: 317: 237-244 en
dc.relation.ispartof Null
dc.subject Selective Mortality
dc.subject Size Selection
dc.subject Ecology
dc.subject Growth
dc.subject Bigger-is-better
dc.subject Otoliths
dc.subject Australia
dc.subject Environmental Sciences & Ecology
dc.subject Light-traps
dc.subject Marine & Freshwater Biology
dc.subject Coral-reef Fish
dc.subject Hypothesis
dc.subject Recruitment
dc.subject Mallotus-villosus
dc.subject Larval-juvenile Transition
dc.subject Oceanography
dc.subject Predation
dc.subject Larval Fish
dc.subject Stage Duration
dc.subject North-west Shelf
dc.subject Growth Rate
dc.title Bigger is better: size-selective mortality throughout the life history of a fast-growing clupeid, Spratelloides gracilis
dc.type journal article en
dc.identifier.wos WOS:000239896600021

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