Risky business for a juvenile marine predator? Testing the influence of foraging strategies on size and growth rate under natural conditions.
Identifieur interne : 000423 ( Main/Exploration ); précédent : 000422; suivant : 000424Risky business for a juvenile marine predator? Testing the influence of foraging strategies on size and growth rate under natural conditions.
Auteurs : Nigel E. Hussey [Canada] ; Joseph D. Dibattista [Australie] ; Jonathan W. Moore [Canada] ; Eric J. Ward [États-Unis] ; Aaron T. Fisk [Canada] ; Steven Kessel [Canada] ; Tristan L. Guttridge [Bahamas] ; Kevin A. Feldheim [États-Unis] ; Bryan R. Franks [États-Unis] ; Samuel H. Gruber [Bahamas] ; Ornella C. Weideli [France] ; Demian D. Chapman [États-Unis]Source :
- Proceedings. Biological sciences [ 1471-2954 ] ; 2017.
Abstract
Mechanisms driving selection of body size and growth rate in wild marine vertebrates are poorly understood, thus limiting knowledge of their fitness costs at ecological, physiological and genetic scales. Here, we indirectly tested whether selection for size-related traits of juvenile sharks that inhabit a nursery hosting two dichotomous habitats, protected mangroves (low predation risk) and exposed seagrass beds (high predation risk), is influenced by their foraging behaviour. Juvenile sharks displayed a continuum of foraging strategies between mangrove and seagrass areas, with some individuals preferentially feeding in one habitat over another. Foraging habitat was correlated with growth rate, whereby slower growing, smaller individuals fed predominantly in sheltered mangroves, whereas larger, faster growing animals fed over exposed seagrass. Concomitantly, tracked juveniles undertook variable movement behaviours across both the low and high predation risk habitat. These data provide supporting evidence for the hypothesis that directional selection favouring smaller size and slower growth rate, both heritable traits in this shark population, may be driven by variability in foraging behaviour and predation risk. Such evolutionary pathways may be critical to adaptation within predator-driven marine ecosystems.
DOI: 10.1098/rspb.2017.0166
PubMed: 28381626
Affiliations:
- Australie, Bahamas, Canada, France, États-Unis
- Floride, Illinois, Washington (État), État de New York
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Weideli</name><affiliation wicri:level="1"><nlm:affiliation>PSL Research University, EPHE-UPVD-CNRS, USR 3278 CRIOBE, Universite de Perpignan, 52 Avenue Paul Alduy, 66860 Perpignan Cedex, France.</nlm:affiliation><country xml:lang="fr">France</country><wicri:regionArea>PSL Research University, EPHE-UPVD-CNRS, USR 3278 CRIOBE, Universite de Perpignan, 52 Avenue Paul Alduy, 66860 Perpignan Cedex</wicri:regionArea><wicri:noRegion>66860 Perpignan Cedex</wicri:noRegion><wicri:noRegion>66860 Perpignan Cedex</wicri:noRegion></affiliation></author><author><name sortKey="Chapman, Demian D" sort="Chapman, Demian D" uniqKey="Chapman D" first="Demian D" last="Chapman">Demian D. Chapman</name><affiliation wicri:level="2"><nlm:affiliation>Institute for Ocean Conservation Science/School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, NY 11794-5000, USA.</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Institute for Ocean Conservation Science/School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, NY 11794-5000</wicri:regionArea><placeName><region type="state">État de New York</region></placeName></affiliation></author></analytic><series><title level="j">Proceedings. Biological sciences</title><idno type="eISSN">1471-2954</idno><imprint><date when="2017" type="published">2017</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Mechanisms driving selection of body size and growth rate in wild marine vertebrates are poorly understood, thus limiting knowledge of their fitness costs at ecological, physiological and genetic scales. Here, we indirectly tested whether selection for size-related traits of juvenile sharks that inhabit a nursery hosting two dichotomous habitats, protected mangroves (low predation risk) and exposed seagrass beds (high predation risk), is influenced by their foraging behaviour. Juvenile sharks displayed a continuum of foraging strategies between mangrove and seagrass areas, with some individuals preferentially feeding in one habitat over another. Foraging habitat was correlated with growth rate, whereby slower growing, smaller individuals fed predominantly in sheltered mangroves, whereas larger, faster growing animals fed over exposed seagrass. Concomitantly, tracked juveniles undertook variable movement behaviours across both the low and high predation risk habitat. These data provide supporting evidence for the hypothesis that directional selection favouring smaller size and slower growth rate, both heritable traits in this shark population, may be driven by variability in foraging behaviour and predation risk. Such evolutionary pathways may be critical to adaptation within predator-driven marine ecosystems.</div></front></TEI><affiliations><list><country><li>Australie</li><li>Bahamas</li><li>Canada</li><li>France</li><li>États-Unis</li></country><region><li>Floride</li><li>Illinois</li><li>Washington (État)</li><li>État de New York</li></region></list><tree><country name="Canada"><noRegion><name sortKey="Hussey, Nigel E" sort="Hussey, Nigel E" uniqKey="Hussey N" first="Nigel E" last="Hussey">Nigel E. Hussey</name></noRegion><name sortKey="Fisk, Aaron T" sort="Fisk, Aaron T" uniqKey="Fisk A" first="Aaron T" last="Fisk">Aaron T. Fisk</name><name sortKey="Kessel, Steven" sort="Kessel, Steven" uniqKey="Kessel S" first="Steven" last="Kessel">Steven Kessel</name><name sortKey="Moore, Jonathan W" sort="Moore, Jonathan W" uniqKey="Moore J" first="Jonathan W" last="Moore">Jonathan W. Moore</name></country><country name="Australie"><noRegion><name sortKey="Dibattista, Joseph D" sort="Dibattista, Joseph D" uniqKey="Dibattista J" first="Joseph D" last="Dibattista">Joseph D. Dibattista</name></noRegion></country><country name="États-Unis"><region name="Washington (État)"><name sortKey="Ward, Eric J" sort="Ward, Eric J" uniqKey="Ward E" first="Eric J" last="Ward">Eric J. Ward</name></region><name sortKey="Chapman, Demian D" sort="Chapman, Demian D" uniqKey="Chapman D" first="Demian D" last="Chapman">Demian D. Chapman</name><name sortKey="Feldheim, Kevin A" sort="Feldheim, Kevin A" uniqKey="Feldheim K" first="Kevin A" last="Feldheim">Kevin A. Feldheim</name><name sortKey="Franks, Bryan R" sort="Franks, Bryan R" uniqKey="Franks B" first="Bryan R" last="Franks">Bryan R. Franks</name></country><country name="Bahamas"><noRegion><name sortKey="Guttridge, Tristan L" sort="Guttridge, Tristan L" uniqKey="Guttridge T" first="Tristan L" last="Guttridge">Tristan L. Guttridge</name></noRegion><name sortKey="Gruber, Samuel H" sort="Gruber, Samuel H" uniqKey="Gruber S" first="Samuel H" last="Gruber">Samuel H. Gruber</name></country><country name="France"><noRegion><name sortKey="Weideli, Ornella C" sort="Weideli, Ornella C" uniqKey="Weideli O" first="Ornella C" last="Weideli">Ornella C. Weideli</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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