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Novel signature fatty acid profile of the giant manta ray suggests reliance on an uncharacterised mesopelagic food source low in polyunsaturated fatty acids ArchiMer
Burgess, Katherine B.; Guerrero, Michel; Marshall, Andrea D.; Richardson, Anthony J.; Bennett, Mike B.; Couturier, Lydie I. E..
Traditionally, large planktivorous elasmobranchs have been thought to predominantly feed on surface zooplankton during daytime hours. However, the recent application of molecular methods to examine long-term assimilated diets, has revealed that these species likely gain the majority from deeper or demersal sources. Signature fatty acid analysis (FA) of muscle tissue was used to examine the assimilated diet of the giant manta ray Mobula birostris, and then compared with surface zooplankton that was collected during feeding and non-feeding events at two aggregation sites off mainland Ecuador. The FA profiles of M. birostris and surface zooplankton were markedly different apart from similar proportions of arachidonic acid, which suggests daytime surface...
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Ano: 2018 URL: https://archimer.ifremer.fr/doc/00419/53000/53940.pdf
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Research Priorities to Support Effective Manta and Devil Ray Conservation ArchiMer
Stewart, Joshua D.; Jaine, Fabrice R. A.; Armstrong, Amelia J.; Armstrong, Asia O.; Bennett, Michael B.; Burgess, Katherine B.; Couturier, Lydie I. E.; Croll, Donald A.; Cronin, Melissa R.; Deakos, Mark H.; Dudgeon, Christine L.; Fernando, Daniel; Froman, Niv; Germanov, Elitza S.; Hall, Martin A.; Hinojosa-alvarez, Silvia; Hosegood, Jane E.; Kashiwagi, Tom; Laglbauer, Betty J. L.; Lezama-ochoa, Nerea; Marshall, Andrea D.; Mcgregor, Frazer; Di Sciara, Giuseppe Notarbartolo; Palacios, Marta D.; Peel, Lauren R.; Richardson, Anthony J.; Rubin, Robert D.; Townsend, Kathy A.; Venables, Stephanie K.; Stevens, Guy M. W..
Manta and devil rays are filter-feeding elasmobranchs that are found circumglobally in tropical and subtropical waters. Although relatively understudied for most of the Twentieth century, public awareness and scientific research on these species has increased dramatically in recent years. Much of this attention has been in response to targeted fisheries, international trade in mobulid products, and a growing concern over the fate of exploited populations. Despite progress in mobulid research, major knowledge gaps still exist, hindering the development of effective management and conservation strategies. We assembled 30 leaders and emerging experts in the fields of mobulid biology, ecology, and conservation to identify pressing knowledge gaps that must be...
Tipo: Text Palavras-chave: Manta; Mobula; Devil ray; Elasmobranch; Management.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00481/59290/62455.pdf
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Manta birostris, predator of the deep? Insight into the diet of the giant manta ray through stable isotope analysis ArchiMer
Burgess, Katherine B.; Couturier, Lydie I. E.; Marshall, Andrea D.; Richardson, Anthony J.; Weeks, Scarla J.; Bennett, Michael B..
The characterization of diet for the giant manta ray Manta birostris has been problematic given their large-scale movement patterns and the difficulty in obtaining stomach contents from this species. The large majority of existing information is based on observational data limited to feeding events at the sea surface during daylight. Recently discovered aggregation sites for the giant manta ray off mainland Ecuador are some of the most accessible to date and provide a unique opportunity for researchers to gather much needed information on this elusive species. To assess how important surface zooplankton is to giant manta ray diet, we conducted stable isotope analysis (N-15 and C-13) on M. birostris muscle and surface zooplankton. Trophic position estimates...
Tipo: Text Palavras-chave: Diet; Eastern tropical Pacific Ocean; Mesopelagic; Trophic ecology; Elasmobranch; Planktivore.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00363/47463/47486.pdf
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