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Article Dans Une Revue Deep Sea Research Part II: Topical Studies in Oceanography Année : 2013

Pelagic cephalopods in the western Indian Ocean: New information from diets of top predators

Frédéric Ménard
Michel Potier
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Evgeny Romanov
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Richard Sabatié
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Yves Cherel
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Résumé

Using a combinationofdiverselargepredatoryfishesandoneseabird,wecollectedinformationonthe cephalopodfaunaofthewesternIndianOcean.Weanalyzedthestomachcontentsof35fishes representingtenfamilies(Xiphiidae,Istiophoridae,Scombridae,Carangidae,Coryphaenidae,Alepisaur- idae,Dasyatidae,Carcharhinidae,AlopiidaeandSphyrnidae)andofthesootytern Onychoprionfuscata of theMozambiqueChannelfrom2000to2010.Bothfreshandaccumulatedbeakswereusedfor identifyingcephalopodprey.Cephalopodswereimportantpreyfortwelvepredators;swordfish Xiphias gladius had thehighestcephalopodproportion;sootytern(O. fuscata) andbigeyetuna(Thunnusobesus) had highproportionstoo.Werecovered23cephalopodfamiliesandidentified38species.Tenspecies fromfourTeuthidafamilies(Ommastrephidae,Onychoteuthidae,HistioteuthidaeandAncistrocheiridae) andtwoOctopodafamilies(ArgonautidaeandBolitaenidae)occurredveryfrequentlyinthestomach contents,whileSepiidawererare.Ommastrephidaewerethemostcephalopodfoodsources:the purplebackflyingsquid Sthenoteuthisoualaniensis was themostprevalentpreybyfar, Ornithoteuthis volatilis was importantforelevenpredatorsandfewbutlargespecimensoftheneonflyingsquid Ommastrephesbartramii wererecoveredinthestomachsofswordfishintheIndianSouthSubtropical Gyreprovinceonly.Predators'groupswereidentifiedbasedoncephalopodpreycomposition,ondepthin whichtheyforage,andonpreysize.Surfacepredators'dietswerecharacterizedbylowercephalopod diversitybutgreateraveragenumbersofcephalopodprey,whereasthedeep-dwellingpredators (swordfishandbigeyetuna)preyedonlargerspecimensthansurfacepredators(O. fuscata or yellowfin tunas Thunnusalbacares). Ourfindingsemphasizedtheusefulnessofacommunityofmarinepredatorsto gainvaluableinformationonthebiologyandthedistributionofthecephalopodforagefaunathatare discussedwithregardtobiogeographicprovince,marinepredator,fishinggeartocatchthelargepelagic fishes,andsizeofthebeaksrecoveredinthestomachs.

Dates et versions

hal-00799458 , version 1 (12-03-2013)

Identifiants

Citer

Frédéric Ménard, Michel Potier, Sébastien Jaquemet, Evgeny Romanov, Richard Sabatié, et al.. Pelagic cephalopods in the western Indian Ocean: New information from diets of top predators. Deep Sea Research Part II: Topical Studies in Oceanography, 2013, 95, pp.83-92. ⟨10.1016/j.dsr2.2012.08.022⟩. ⟨hal-00799458⟩
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