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| 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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| Dufois, Francois; Hardman-mountford, Nick J.; Greenwood, Jim; Richardson, Anthony J.; Feng, Ming; Herbette, Steven; Matear, Richard. |
| A unique feature of the subtropical South Indian Ocean is the existence of anticyclonic eddies that have higher chlorophyll concentrations than cyclonic eddies. Off Western Australia, this anomalous behavior is related to the seeding of anticyclonic eddies with shelf water enriched in phytoplankton biomass and nutrients. Further off-shore, two mechanisms have been suggested to explain the eddy/chlorophyll relationship: (i) eddies originating from the Australian coast maintain their chlorophyll anomaly while propagating westward; and (ii) eddy-induced Ekman upwelling (downwelling) enhances (dampens) nutrient supply in anticyclonic (cyclonic) eddies. Here we describe the relationship between eddies and surface chlorophyll within the South Indian Ocean, and... |
| Tipo: Text |
Palavras-chave: Eddies; Chlorophyll; Self-organizing map; Convective mixing; Eddy-induced Ekman pumping. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00233/34464/32862.pdf |
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| Fu, Caihong; Large, Scott; Knight, Ben; Richardson, Anthony J.; Bundy, Alida; Reygondeau, Gabriel; Boldt, Jennifer; Van Der Meeren, Gro I.; Torres, Maria A; Sobrino, Ignacio; Auber, Arnaud; Travers-trolet, Morgane; Piroddi, Chiara; Diallo, Ibrahima; Jouffre, Didier; Mendes, Hugo; Borges, Maria Fatima; Lynam, Christopher P.; Coll, Marta; Shannon, Lynne J.; Shin, Yunne-jai. |
| Understanding how external pressures impact ecosystem structure and functioning is essential for ecosystem-based approaches to fisheries management. We quantified the relative effects of fisheries exploitation and environmental conditions on ecological indicators derived from two different data sources, fisheries catch data (catch-based) and fisheries independent survey data (survey-based) for 12 marine ecosystems using a partial least squares path modeling approach (PLS-PM). We linked these ecological indicators to the total biomass of the ecosystem. Although the effects of exploitation and environmental conditions differed across the ecosystems, some general results can be drawn from the comparative approach. Interestingly, the PLS-PM analyses showed... |
| Tipo: Text |
Palavras-chave: Ecological indicators; Environmental conditions; Fisheries exploitation; Marine ecosystems; Partial least squares path modeling. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00250/36155/34710.pdf |
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| 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... |
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Palavras-chave: Manta; Mobula; Devil ray; Elasmobranch; Management. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00481/59290/62455.pdf |
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| Batten, Sonia D.; Abu-alhaija, Rana; Chiba, Sanae; Edwards, Martin; Grahams, George; Jyothibabu, R.; Kitchener, John A.; Koubbis, Philippe; Mcquatters-gollop, Abigail; Muxagata, Erik; Ostle, Clare; Richardson, Anthony J.; Robinson, Karen, V; Takahashi, Kunio T.; Verheye, Hans M.; Wilson, Willie. |
| Plankton are the base of marine food webs, essential to sustaining fisheries and other marine life. Continuous Plankton Recorders (CPRs) have sampled plankton for decades in both hemispheres and several regional seas. CPR research has been integral to advancing understanding of plankton dynamics and informing policy and management decisions. We describe how the CPR can contribute to global plankton diversity monitoring, being cost-effective over large scales and providing taxonomically resolved data. At OceanObs09 an integrated network of regional CPR surveys was envisaged and in 2011 the existing surveys formed the Global Alliance of CPR Surveys (GACS). GAGS first focused on strengthening the dataset by identifying and documenting CPR best practices,... |
| Tipo: Text |
Palavras-chave: Continuous Plankton Recorder; Zooplankton; Phytoplankton; Global monitoring; Biodiversity; Ocean observing; Essential ocean variables. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00689/80060/83064.pdf |
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