| Enregistrements |
| Auteur |
Briscoe, D.K.; Hobday, A.J.; Carlisle, A.; Scales, K.; Eveson, J.P.; Arrizabalaga, H.; Druon, J.N.; Fromentin, J.-M. |
| Titre |
Ecological bridges and barriers in pelagic ecosystems |
Type |
Article scientifique |
| Année |
2017 |
Publication |
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Revue Abrégée |
Deep-Sea Res. Part II-Top. Stud. Oceanogr. |
| Volume |
140 |
Numéro |
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Pages |
182-192 |
| Mots-Clés |
arctic marine mammals; atlantic bluefin tuna; Billfish; Brazilian episode; climate-change; el-nino; interannual variation; Marine mammal; marlin makaira-nigricans; Migration corridors; Oceanographic features; population connectivity; satellite archival tags; sea-turtles; site fidelity; species distribution; thunnus-maccoyii; Tuna |
| Résumé |
Many highly mobile species are known to use persistent pathways or corridors to move between habitat patches in which conditions are favorable for particular activities, such as breeding or foraging. In the marine realm, environmental variability can lead to the development of temporary periods of anomalous oceanographic conditions that can connect individuals to areas of habitat outside a population's usual range, or alternatively, restrict individuals from areas usually within their range, thus acting as ecological bridges or ecological barriers. These temporary features can result in novel or irregular trophic interactions and changes in population spatial dynamics, and, therefore, may have significant implications for management of marine ecosystems. Here, we provide evidence of ecological bridges and barriers in different ocean regions, drawing upon five case studies in which particular oceanographic conditions have facilitated or restricted the movements of individuals from highly migratory species. We discuss the potential population-level significance of ecological bridges and barriers, with respect to the life history characteristics of different species, and inter- and intra-population variability in habitat use. Finally, we summarize the persistence of bridge dynamics with time, our ability to monitor bridges and barriers in a changing climate, and implications for forecasting future climate mediated ecosystem change. |
| Adresse |
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| Auteur institutionnel |
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Thèse |
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| Editeur |
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Lieu de Publication |
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Éditeur |
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| Langue |
English |
Langue du Résumé |
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Titre Original |
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| Éditeur de collection |
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Titre de collection |
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Titre de collection Abrégé |
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| Volume de collection |
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Numéro de collection |
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Edition |
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| ISSN |
0967-0645 |
ISBN |
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Médium |
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| Région |
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Expédition |
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Conférence |
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| Notes |
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Approuvé |
pas de |
| Numéro d'Appel |
MARBEC @ alain.herve @ |
collection |
2178 |
| Lien permanent pour cet enregistrement |
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| Auteur |
Olson, R.J.; Young, J.W.; Menard, F.; Potier, M.; Allain, V.; Goni, N.; Logan, J.M.; Galvan-Magana, F. |
| Titre |
Bioenergetics, Trophic Ecology, and Niche Separation of Tunas |
Type |
Chapitre de livre |
| Année |
2016 |
Publication |
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Revue Abrégée |
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| Volume |
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Numéro |
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Pages |
199-344 |
| Mots-Clés |
albacore thunnus-alalunga; atlantic bluefin tuna; eastern tropical pacific; fish aggregation devices; gulf-of-mexico; large pelagic fishes; oceanic top predators; predator-prey interactions; satellite archival tags; western indian-ocean |
| Résumé |
Tunas are highly specialized predators that have evolved numerous adaptations for a lifestyle that requires large amounts of energy consumption. Here we review our understanding of the bioenergetics and feeding dynamics of tunas on a global scale, with an emphasis on yellowfin, bigeye, skipjack, albacore, and Atlantic bluefin tunas. Food consumption balances bioenergetics expenditures for respiration, growth (including gonad production), specific dynamic action, egestion, and excretion. Tunas feed across the micronekton and some large zooplankton. Some tunas appear to time their life history to take advantage of ephemeral aggregations of crustacean, fish, and molluscan prey. Ontogenetic and spatial diet differences are substantial, and significant interdecadal changes in prey composition have been observed. Diet shifts from larger to smaller prey taxa highlight ecosystem-wide changes in prey availability and diversity and provide implications for changing bioenergetics requirements into the future. Where tunas overlap, we show evidence of niche separation between them; resources are divided largely by differences in diet percentages and size ranges of prey taxa. The lack of long-term data limits the ability to predict impacts of climate change on tuna feeding behaviour. We note the need for systematic collection of feeding data as part of routine monitoring of these species, and we highlight the advantages of using biochemical techniques for broad-scale analyses of trophic relations. We support the continued development of ecosystem models, which all too often lack the regional-specific trophic data needed to adequately investigate climate and fishing impacts. |
| Adresse |
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| Auteur institutionnel |
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Thèse |
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| Editeur |
Elsevier Academic Press Inc |
Lieu de Publication |
San Diego |
Éditeur |
Curry, B.E. |
| Langue |
English |
Langue du Résumé |
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Titre Original |
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| Éditeur de collection |
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Titre de collection |
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Titre de collection Abrégé |
Advances in Marine Biology, Vol 74 |
| Volume de collection |
74 |
Numéro de collection |
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Edition |
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| ISSN |
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ISBN |
978-0-12-803607-5 |
Médium |
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| Région |
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Expédition |
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Conférence |
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| Notes |
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Approuvé |
pas de |
| Numéro d'Appel |
MARBEC @ alain.herve @ |
collection |
1661 |
| Lien permanent pour cet enregistrement |
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| Auteur |
Soria, M.; Tremblay, Y.; Blaison, A.; Forget, F.; Crochelet, E.; Dagorn, L. |
| Titre |
Large-scale movements and site fidelity of two bull sharks Carcharhinus leucas estimated from a double-tagging experiment at Reunion Island (southwest Indian Ocean) |
Type |
Article scientifique |
| Année |
2021 |
Publication |
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Revue Abrégée |
Afr. J. Mar. Sci. |
| Volume |
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Numéro |
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Pages |
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| Mots-Clés |
philopatry; pop-up satellite archival tags; residence time; shark-bite management; telemetry; western Indian Ocean |
| Résumé |
Since 2011, the mean number of bites per year by bull sharks Carcharhinus leucas has increased markedly at Reunion Island. To predict areas and periods of increased risk, we need to better understand the space-use dynamics of individual sharks. In coastal waters off Reunion Island, two bull sharks, one of each sex, were double-tagged and tracked for 174 days (male) and 139 days (female) using pop-up satellite archival tags (PSATs) and acoustic transmitters. Both sharks spent most of their time inshore (58.1% for the male and 89.9% for the female). The female performed short excursions but typically remained inshore. The male alternated between spending residence time along the coast and undertaking wide-ranging movements, including one extensive open-ocean excursion to the vicinity of a seamount situated about 210 km from the island. Differences in the residency and home range between the two sharks probably reflect different patterns of foraging and mating behaviours. Our results highlight the advantages of double-tagging in telemetry studies that attempt to estimate the degree of habitat fidelity of a species and illustrate the need to consider the movement patterns of sharks at different scales when developing efficient risk-mitigation management. |
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| Auteur institutionnel |
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Thèse |
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| Editeur |
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Lieu de Publication |
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Éditeur |
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| Langue |
English |
Langue du Résumé |
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Titre Original |
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| Éditeur de collection |
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Titre de collection |
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Titre de collection Abrégé |
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| Volume de collection |
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Numéro de collection |
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Edition |
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| ISSN |
1814-232x |
ISBN |
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Médium |
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| Région |
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Expédition |
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Conférence |
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| Notes |
WOS:000622208300001 |
Approuvé |
pas de |
| Numéro d'Appel |
MARBEC @ isabelle.vidal-ayouba @ |
collection |
3008 |
| Lien permanent pour cet enregistrement |
