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Commercial fishing patterns influence odontocete whale-longline interactions in the Southern Ocean 5
Tixier, Paul; Burch, Paul; Richard, Gaetan; Olsson, Karin; Welsford, Dirk; Lea, Mary-anne; Hindell, Mark A.; Guinet, Christophe; Janc, Anais; Gasco, Nicolas; Duhamel, Guy; Villanueva, Ching-maria; Suberg, Lavinia; Arangio, Rhys; Söffker, Marta; Arnould, John P.y..
The emergence of longline fishing around the world has been concomitant with an increase in depredation-interactions by odontocete whales (removal of fish caught on hooks), resulting in substantial socio-economic and ecological impacts. The extent, trends and underlying mechanisms driving these interactions remain poorly known. Using long-term (2003–2017) datasets from seven major Patagonian toothfish (Dissostichus eleginoides) longline fisheries, this study assessed the levels and inter-annual trends of sperm whale (Physeter macrocephalus) and/or killer whale (Orcinus orca) interactions as proportions of fishing time (days) and fishing area (spatial cells). The role of fishing patterns in explaining between-fisheries variations of probabilities of...
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Ano: 2019 URL: https://archimer.ifremer.fr/doc/00481/59242/61961.pdf
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Détection de la coelentérazine chez cinq espèces de Myctophidae du plateau des Iles Kerguelen 5
Duchatelet, Laurent; Hermans, Claire; Duhamel, Guy; Cherel, Yves; Guinet, Christophe; Mallefet, Jérôme.
Myctophidae comprise the largest biomass of mesopelagic fishes in the Southern Ocean. This family has the ability to emit light – bioluminescence – via specific organs called photophores, and from the head and caudal organs. Through biochemical analyses, this study reveals that coelenterazine is the substrate for light reaction in the five most common myctophid species from the Southern Ocean. The results also support the hypothesis of the acquisition of this molecule via the food chain and reveal the presence of two stabilised storage forms of coelenterazine (enol-sulfate and dehydrocoelenterazine) within various tissues of the studied species. Finally, detection of coelenterazine in the gonads also suggests the potential maternal transfer of the...
Tipo: Text Palavras-chave: Myctophidae; Bioluminescence; Coelenterazine; Dehydrocoelenterazine; Enol-sulfate; Biochemical assays.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00502/61405/65084.pdf
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Éco-régionalisation et conservation des communautés benthiques de la zone économique exclusive française des îles Kerguelen 5
Martin, Alexis; Trouslard, Emmanuelle; Hautecoeur, Mélyne; Blettery, Jonathan; Moreau, Camille; Saucède, Thomas; Améziane, Nadia; Duhamel, Guy; Eléaume, Marc.
The deep-sea benthic ecosystems of the French Kerguelen exclusive economic zone remain poorly understood. To address benthic conservation issues, the authors recently contributed expert knowledge to guide the recent extension of the Marine Reserve of the ‘Terres australes françaises’. In this new study, we propose a benthic ecoregionalisation of the northern Kerguelen Plateau based on a measurable and repeatable methodology that relies on the generalised dissimilarity modelling technique. Data of macro-epibenthic invertebrate species from the POKER 2 (2010) fish stock assessment survey have been used to compute the models. Our results allow us (i) to characterise and map benthic landscape units based on assemblages of marine invertebrates pooled by taxa...
Tipo: Text Palavras-chave: Myctophidae; Bioluminescence; Coelenterazine; Dehydrocoelenterazine; Enol-sulfate; Biochemical assays.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00505/61671/65598.pdf
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Estimating the biodiversity of the East Antarctic shelf and oceanic zone for ecoregionalisation: Example of the ichthyofauna of the CEAMARC (Collaborative East Antarctic Marine Census) CAML surveys 5
Koubbi, Philippe; Ozouf-costaz, Catherine; Goarant, Anne; Moteki, Masato; Hulley, Percy-alexander; Causse, Romain; Dettai, Agnes; Duhamel, Guy; Pruvost, Patrice; Tavernier, Eric; Post, Alexandra L.; Beaman, Robin J.; Rintoul, Stephen R.; Hirawake, Toru; Hirano, Daisuke; Ishimaru, Takashi; Riddle, Martin; Hosie, Graham.
Ecoregions are defined in terms of community structure as a function of abiotic or even anthropogenic forcing. They are meso-scale structures defined as the potential habitat of a species or the predicted communities geographic extent. We assume that they can be more easily defined for long-lived species, such as benthos or neritic fish, in the marine environment. Uncertainties exist for the pelagic realm because of its higher variability, plus little is known about the meso- and bathypelagic zones. A changing environment and modification of habitats will probably drive new communities from plankton to fish or top predators. We need baseline studies, such as those of the Census of Antarctic Marine Life, and databases like SCAR-MarBIN as tools for...
Tipo: Text Palavras-chave: East Antarctic shelf; Ichthyofauna; Ecoregionalisation; Generalized dissimilarity modeling; Dumont d'Urville Sea.
Ano: 2010 URL: https://archimer.ifremer.fr/doc/00236/34740/33086.pdf
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Feeding of diving predators and diel vertical migration of prey: King penguins' diet versus trawl sampling at Kerguelen Islands 5
Bost, Charles-andré; Zorn, T; Le Maho, Yvon; Duhamel, Guy.
The diving behavior and diet composition of King penguins were examined during summer 1995 at Kerguelen Islands. This was in relation to real-time estimations of diel prey availability during 2 sampling sessions totaling 10 d at sea. During daylight hours King penguins performed medium to deep dives of 120-250 m. At night, they dived no deeper than 60 m. Daytime, dusk and night-time sampling of prey was performed in the depth ranges corresponding to the depths of the penguins' dives in this study. The diversity in mesopelagic fish was found to be highest during the night at 0-50 m (15 vs 9 species during the day), and their number was up to 20-fold higher at these depths at night than during the day at the 150-250 m depth layer. The 3 myctophid species...
Tipo: Text Palavras-chave: King penguins; Diet; Diel vertical migration; Myctophids; Foraging behavior.
Ano: 2002 URL: https://archimer.ifremer.fr/doc/00247/35842/34355.pdf
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How do fishing practices influence sperm whale (Physeter macrocephalus) depredation on demersal longline fisheries? 5
Janc, Anais; Richard, Gaetan; Guinet, Christophe; Arnould, John P. Y.; Villanueva, Ching-maria; Duhamel, Guy; Gasco, Nicolas; Tixier, Paul.
Marine mammal depredation on fisheries (animals removing fish caught on fishing gear) is a worldwide issue involving socio-economic and ecological consequences. Longline fisheries are the most impacted by odontocete (toothed whales) depredation. While technological means have provided limited efficacy in reducing depredation, this study examined the fishing practices influencing both the proportion of depredated longline sets and the amount of fish removed by whales. We used an 8-year dataset from the Patagonian toothfish (Dissostichus eleginoides) longline fisheries operating in Crozet and Kerguelen Economic Exclusive Zones (EEZs) (South Indian Ocean) and GLMMs to investigate sperm whale (Physeter macrocephalus) depredation. Sperm whale depredation...
Tipo: Text Palavras-chave: Depredation; Demersal longline; Sperm whale; Patagonian toothfish; Fishing practices.
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00439/55070/56795.pdf
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Impacts of climatic anomalies on provisioning strategies of a Southern Ocean predator 5
Lea, Mary-anne; Guinet, Christophe; Cherel, Yves; Duhamel, Guy; Dubroca, Laurent; Pruvost, Patrice; Hindell, Mark.
The large temporal and spatial variability in marine productivity encountered by marine predators may negatively influence breeding success. The Antarctic fur seal Arctocephalus gazella (AFS), a marine predator in the Southern Ocean (SO) ecosystem with a circumpolar distribution, exhibits a short, 4 mo lactation coinciding with increased summer marine productivity. The diet of AFS, and the distance to significant and productive oceanographic features, such as the Antarctic Polar Frontal Zone (PFZ), varies considerably between populations. We studied the foraging activity, foraging efficiency and the pup provisioning strategies of lactating AFS at a key breeding site in the southern Indian Ocean, the Kerguelen Archipelago. Foraging parameters were examined...
Tipo: Text Palavras-chave: Antarctic fur seal; Polar front; Pinniped; ENSO; Foraging; Growth; Diving; Seabird; Myctophid; Maternal care.
Ano: 2006 URL: https://archimer.ifremer.fr/doc/00247/35847/34356.pdf
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Is the Species Flock Concept Operational? The Antarctic Shelf Case 5
Lecointre, Guillaume; Ameziane, Nadia; Boisselier, Marie-catherine; Bonillo, Celine; Busson, Frederic; Causse, Romain; Chenuil, Anne; Couloux, Arnaud; Coutanceau, Jean-pierre; Cruaud, Corinne; D'Udekem D'Acoz, Cedric; De Ridder, Chantal; Denys, Gael; Dettai, Agnes; Duhamel, Guy; Eleaume, Marc; Feral, Jean-pierre; Gallut, Cyril; Havermans, Charlotte; Held, Christoph; Hemery, Lenaig; Lautredou, Anne-claire; Martin, Patrick; Ozouf-costaz, Catherine; Pierrat, Benjamin; Pruvost, Patrice; Puillandre, Nicolas; Samadi, Sarah; Saucede, Thomas; Schubart, Christoph; David, Bruno.
There has been a significant body of literature on species flock definition but not so much about practical means to appraise them. We here apply the five criteria of Eastman and McCune for detecting species flocks in four taxonomic components of the benthic fauna of the Antarctic shelf: teleost fishes, crinoids (feather stars), echinoids (sea urchins) and crustacean arthropods. Practical limitations led us to prioritize the three historical criteria (endemicity, monophyly, species richness) over the two ecological ones (ecological diversity and habitat dominance). We propose a new protocol which includes an iterative fine-tuning of the monophyly and endemicity criteria in order to discover unsuspected flocks. As a result nine "full" species flocks...
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Ano: 2013 URL: https://archimer.ifremer.fr/doc/00296/40754/39754.pdf
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Spatial distribution of foraging in female Antarctic fur seals Arctocephalus gazella in relation to oceanographic variables: a scale-dependent approach using geographic information systems 5
Guinet, Christophe; Dubroca, L; Lea, Ma; Goldsworthy, S; Cherel, Yan; Duhamel, Guy; Bonadonna, F; Donnay, Jp.
The distribution of foraging activity for female Antarctic fur seals was investigated at Cap Noir (49 degrees 07 'S, 70 degrees 45 'E), Kerguelen Island in February 1998. Eleven females were fitted with a satellite transmitter and time-depth recorder. The 2 data sets were combined in order to locate diving activity of the seals. The occurrence of fish in the diet of the seals was investigated by the identification of otoliths in 55 scats collected at the breeding colony during the study period. Oceanographic variables were measured simultaneously by direct sampling and satellite remote sensing. The mesopelagic fish community was sampled at 20 stations along 4 transects, where epipelagic trawls were conducted at night at 50 ni depth. We then investigated,...
Tipo: Text Palavras-chave: Antarctic fur seal; Diet; Oceanographic conditions; Foraging; Geographic information system.
Ano: 2001 URL: https://archimer.ifremer.fr/doc/00247/35843/34354.pdf
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Variations de la répartition des cachalots sur le plateau de Kerguelen suggérée par les données d’interaction avec les pêcheries 5
Tixier, Paul; Welsford, Dirk; Lea, Mary-anne; Hindell, Mark; Guinet, Christophe; Janc, Anaïs; Richard, Gaetan; Gasco, Nicolas; Duhamel, Guy; Arangio, Rhys; Villanueva, Ching-maria; Suberg, Lavinia; Arnould, John.
The emergence of longline fishing for Patagonian toothfish (Dissostichus eleginoides) on the Kerguelen Plateau over the past two decades is concomitant with the development of depredation-type interactions by sperm whales (Physeter macrocephalus). Through a unique collaboration between the French and the Australian fisheries operating respectively around Kerguelen, and Heard Island and McDonald Islands (HIMI), this study preliminarily investigated the spatio–temporal variations of the rate of occurrence of sperm whale depredation on the Kerguelen Plateau. Between 2011 and 2016, sperm whales depredated toothfish on 29.1% of all longline sets and over 49.4% of the fished area. The probability of vessels to experience depredation decreased with the latitude...
Tipo: Text Palavras-chave: Fisheries interactions; Sperm whale; Patagonian toothfish; Kerguelen; Depredation.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00502/61411/65094.pdf
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