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Auteur Carpentier, A.S.; Berthe, C.; Ender, I.; Jaine, F.R.A.; Mourier, J.; Stevens, G.; De Rosemont, M.; Clua, E. doi  openurl
  Titre Preliminary insights into the population characteristics and distribution of reef (Mobula alfredi) and oceanic (M. birostris) manta rays in French Polynesia Type Article scientifique
  Année 2019 Publication Revue Abrégée Coral Reefs  
  Volume 38 Numéro 6 Pages 1197-1210  
  Mots-Clés aggregation; australia; bottle-nosed dolphins; california; Citizen science; conservation; Ecotourism management; habitat use; identification; marine park; movements; sharks; Site fidelity; Spatial connectivity; Sympatry  
  Résumé In French Polynesia, both currently recognized manta ray species, Mobula alfredi and M. birostris, are observed. Despite being an important cultural asset and generating significant economic benefits through manta ray watching tourism, published data on the ecology and threats to these species in the region are scarce. Based on an 18-year dataset of sighting records collected by citizen scientists and during two scientific expeditions, this study provides the first insights into the population characteristics and regional distribution of the two manta ray species in French Polynesia. A total of 1347 manta ray photographs (1337 for M. alfredi and 10 for M. birostris) were examined for the period January 2001-December 2017, with photo-identification techniques leading to the successful identification of 317 individual M. alfredi and 10 individual M. birostris throughout the Society, Tuamotu and Marquesas Islands. We provide the first confirmation of sympatric distribution of both species in the Society Islands. Our results highlight strong and long-term site fidelity of M. alfredi individuals to certain aggregation sites (> 9 years for 16 individuals) and reveal some degree of connectivity between populations, with 10 individuals recorded moving between islands located up to 50 km apart. Analysis of photographs of individuals bearing sub-lethal injuries (n = 68) suggests that M. alfredi are more likely to be injured at inhabited islands (Maupiti or Bora Bora; 75% of all injured individuals) than at uninhabited islands, with 75% of injuries related to boat propeller strikes and fishing gear entanglements. Our findings emphasize the need for further research to allow for a comprehensive evaluation of population structure, size and threats to manta rays in this region.  
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  Langue English Langue du Résumé Titre Original  
  Éditeur de collection Titre de collection Titre de collection Abrégé  
  Volume de collection Numéro de collection Edition  
  ISSN 0722-4028 ISBN Médium  
  Région Expédition Conférence  
  Notes WOS:000496024100010 Approuvé pas de  
  Numéro d'Appel (up) MARBEC @ isabelle.vidal-ayouba @ collection 2658  
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Auteur Bonnin, L.; Robbins, W.D.; Boussarie, G.; Kiszka, J.J.; Dagorn, L.; Mouillot, D.; Vigliola, L. doi  openurl
  Titre Repeated long-range migrations of adult males in a common Indo-Pacific reef shark Type Article scientifique
  Année 2019 Publication Revue Abrégée Coral Reefs  
  Volume Numéro Pages  
  Mots-Clés carcharhinus-amblyrhynchos; carcharias; fidelity; Male-biased dispersal; Migration; movements; New Caledonia; patterns; philopatry; population; Reef shark; residency; site; Telemetry; white sharks  
  Résumé The grey reef shark, Carcharhinus amblyrhynchos, is one of the most abundant coral reef sharks throughout the Indo-Pacific. However, this species has been critically impacted across its range, with well-documented population declines of > 90% attributed to human activities. A key knowledge gap in the successful implementation of grey reef shark conservation plans is the understanding of large-scale movement patterns, along with the associated biological and ecological drivers. To address this shortfall, we acoustically monitored 147 adult and juvenile grey reef sharks of all sexes for more than 2 yr across the New Caledonian archipelago, West Pacific. Here, we document multiple adult males undertaking return journeys of up to nearly 700 km in consecutive years. This constitutes the first evidence of repeated long-range migrations for this species. Although only a limited number of adult males were definitively tracked undertaking migrations, similar timing in changes in the detection patterns of a further 13 animals, mostly adult males, suggests this behavior may be more common than previously thought. The paucity of evidence for juvenile migrations and timing of adult movements suggest that mating is the motivation behind these migrations. Our results have important implications for management, given the potential of mature individuals to recurrently travel outside managed or protected areas. Future management of this species clearly needs to consider the importance of large-scale migratory behaviors when developing management plans.  
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  Langue English Langue du Résumé Titre Original  
  Éditeur de collection Titre de collection Titre de collection Abrégé  
  Volume de collection Numéro de collection Edition  
  ISSN 0722-4028 ISBN Médium  
  Région Expédition Conférence  
  Notes WOS:000496832900001 Approuvé pas de  
  Numéro d'Appel (up) MARBEC @ isabelle.vidal-ayouba @ collection 2670  
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Auteur Mourier, J.; Ballesta, L.; Clua, E.; Planes, S. doi  openurl
  Titre Visitation patterns of camouflage groupers Epinephelus polyphekadion at a spawning aggregation in Fakarava inferred by acoustic telemetry Type Article scientifique
  Année 2019 Publication Revue Abrégée Coral Reefs  
  Volume 38 Numéro 5 Pages 909-916  
  Mots-Clés brown-marbled grouper; Conservation; dynamics; Epinephelus polyphekadion; Fakarava; French Polynesia; movement; Reproduction; Serranidae: Epinephelinae; snapper  
  Résumé Many species of groupers form transient fish spawning aggregations (FSAs) that are both spatially and temporally predictable, making them highly vulnerable to fishing. Consequently, many known aggregations have disappeared, making the collection of additional baseline data imperative to inform management actions and decisions that have the capacity to protect these important areas in the long term. Using acoustic telemetry and underwater observations, we document the spatio-temporal dynamics of the camouflage grouper Epinephelus polyphekadion at a FSA in Fakarava, French Polynesia. We show that grouper arrival at the aggregation site started 2 weeks before the full moon with a core area density that increased from 0.13 to 1.25 fish m(-2) during the observation period. Following reproduction, almost all camouflage groupers left the FSA site within 48 h. Among 30 tagged groupers in 2011 and despite a relatively low receiver coverage in the pass, 30% returned to the FSA the following year confirming patterns of FSA site fidelity of the species found in previous studies at other locations. Our results confirm that the current management procedures protecting the FSA under the UNESCO biosphere reserve are critical in maintaining the functional role of the FSA by ensuring the persistence and sustainability of large and healthy populations of groupers and sharks.  
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  Editeur Lieu de Publication Éditeur  
  Langue English Langue du Résumé Titre Original  
  Éditeur de collection Titre de collection Titre de collection Abrégé  
  Volume de collection Numéro de collection Edition  
  ISSN 0722-4028 ISBN Médium  
  Région Expédition Conférence  
  Notes WOS:000510855000003 Approuvé pas de  
  Numéro d'Appel (up) MARBEC @ isabelle.vidal-ayouba @ collection 2739  
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Auteur Thorne, L.H.; Hazen, E.L.; Bograd, S.J.; Foley, D.G.; Conners, M.G.; Kappes, M.A.; Kim, H.M.; Costa, D.P.; Tremblay, Y.; Shaffer, S.A. url  doi
openurl 
  Titre Foraging behavior links climate variability and reproduction in North Pacific albatrosses Type Article scientifique
  Année 2015 Publication Revue Abrégée Movement Ecology  
  Volume 3 Numéro 1 Pages 27  
  Mots-Clés Albatross; Climate; Environmental variability; Movement; Reproductive success  
  Résumé Climate-driven environmental change in the North Pacific has been well documented, with marked effects on the habitat and foraging behavior of marine predators. However, the mechanistic linkages connecting climate-driven changes in behavior to predator populations are not well understood. We evaluated the effects of climate-driven environmental variability on the reproductive success and foraging behavior of Laysan and Black-footed albatrosses breeding in the Northwest Hawaiian Islands during both brooding and incubating periods. We assessed foraging trip metrics and reproductive success using data collected from 2002–2012 and 1981–2012, respectively, relative to variability in the location of the Transition Zone Chlorophyll Front (TZCF, an important foraging region for albatrosses), sea surface temperature (SST), Multivariate ENSO Index (MEI), and the North Pacific Gyre Oscillation index (NPGO).  
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  Langue en Langue du Résumé Titre Original  
  Éditeur de collection Titre de collection Titre de collection Abrégé  
  Volume de collection Numéro de collection Edition  
  ISSN 2051-3933 ISBN Médium  
  Région Expédition Conférence  
  Notes Approuvé pas de  
  Numéro d'Appel (up) MARBEC @ isabelle.vidal-ayouba @ collection 1462  
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Auteur Suquet, M.; Cosson, J.; Donval, A.; Labbe, C.; Boulais, M.; Haffray, P.; Bernard, I.; Fauvel, C. url  doi
openurl 
  Titre Marathon vs sprint racers: an adaptation of sperm characteristics to the reproductive strategy of Pacific oyster, turbot and seabass Type Article scientifique
  Année 2012 Publication Revue Abrégée J. Appl. Ichthyol.  
  Volume 28 Numéro 6 Pages 956-960  
  Mots-Clés activation; crassostrea-gigas; fertilization; marine fish; motility; movement; pecten-maximus; respiration; scophthalmus-maximus; spermatozoa  
  Résumé This work assesses the present knowledge on Pacific oyster sperm biology in comparison to two marine fish species (turbot and seabass) whose sperm characteristics are well described. Sperm morphology mainly differs by the presence of an acrosome in Pacific oyster which is absent in both fish species. In turbot as in Pacific oyster, a sperm maturation process along the genital tract is observed. Sperm motility is triggered by changes in osmolality for seabass and turbot and in pH for Pacific oyster. However, complementary factors are involved to maintain sperm immotile in the genital tract. Sperm movement duration is very long in Pacific oyster (2024 h), compared to turbot (35 min) and seabass (4050 s). A high capacity of ATP regeneration is observed in Pacific oyster sperm, sustained by the limited changes in its morphology observed at the end of the swimming phase. Then, the total distance covered by spermatozoa is very different among the studied species (seabass: 2 mm, turbot: 12 mm, Pacific oyster: 1 m). Considering the main characteristics of sperm movement, the three studied species can be separated in two groups: the sprint racer group (seabass: high velocity and short distance covered) and the marathonian racer one (Pacific oyster: low velocity but covering long distances). To an intermediate extent, turbot sperm belongs to the sprint racer group. Then, the two different sperm movement strategies observed in the three species, are compensated by the behaviour of the breeders.  
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  Editeur Lieu de Publication Éditeur  
  Langue English Langue du Résumé Titre Original  
  Éditeur de collection Titre de collection Titre de collection Abrégé  
  Volume de collection Numéro de collection Edition  
  ISSN 0175-8659 ISBN Médium  
  Région Expédition Conférence  
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  Numéro d'Appel (up) MARBEC @ isabelle.vidal-ayouba @ collection 701  
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