Consulta: subjectFacets:"Pelagic ecosystem"
Registros recuperados: 10
Data/hora: 05/06/2024 06:37:00

Global data set for nitrogen and carbon stable isotopes of tunas
Provedor de dados: 5
Autores: Bodin, Nathalie; Pethybridge, Heidi; Duffy, Leanne M.; Lorrain, Anne; Allain, Valerie; Logan, John M.; Ménard, Frederic; Graham, Brittany; Choy, C. Anela; Somes, Christopher J.; Olson, Robert J.; Young, Jock W.
Nitrogen and carbon stable isotope data sets are commonly used to assess complex population to ecosystem responses to natural or anthropogenic changes at regional to global spatial scales, and monthly to decadal timescales. Measured in the tissues of consumers, nitrogen isotopes (δ15N) are primarily used to estimate trophic position while carbon isotopes (δ13C) describe habitat associations and feeding pathways. Models of both δ15N and δ13C values and their associated variance can be used to estimate likely dietary contributions and niche width and provide inferences about consumer movement and migration. Stable isotope data have added utility when used in combination with other empirical data sets (e.g., stomach content, movement tracking,...
Tipo: Text
Palavras-chave: Baseline isotopic variability; Food web dynamics; Global Ocean; Marine top predators; Pelagic ecosystem; Scombrids; Trophic position.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00665/77750/79872.pdf

Rapport sur l'utilisation du sondeur multifaisceaux ME70 lors des campagnes Pelgas08 et Class08
Provedor de dados: 5
Autores: Doray, Mathieu; Petitgas, Pierre; Masse, Jacques; Trenkel, Verena.
Report on Simrad ME70 multibeam echosounder operations during Pelgas08 and Class08 sea surveys. First observations of small pelagic fish 3D aggregative structures
Tipo: Text
Palavras-chave: Pelagic ecosystem; Bay of Biscay; 3D fisheries acoustics; Multibeam echosounder; Écosystème pélagique; Golfe de Gascogne; Acoustique halieutique 3D; Sondeur multifaisceaux.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/rapport-6314.pdf

Resource partitioning within a tropical seabird community: new information from stable isotopes
Provedor de dados: 5
Autores: Cherel, Y; Le Corre, M; Jaquemet, S; Menard, Frederic; Richard, Pierre; Weimerskirch, H.
Characteristics of the tropical oceanic environment (low productivity, little seasonality) and poor diversity of tropical seabird foraging methods and prey relative to temperate and polar species suggest that tropical seabirds overall encompass a narrow range of isotopic niches, with large overlaps among species. To test this hypothesis, we examined the stable carbon (delta C-13) and nitrogen (delta N-15) isotopic composition of blood and feathers of 5 seabird species from Europa Island, Mozambique Channel. While differences were small, blood delta C-13 and delta N-15 values characterized 5 distinct and non-overlapping trophic niches during the breeding period. Seabirds used 2 distinct foraging areas (delta C-13), one used by sooty tern Sterna fuscata and...
Tipo: Text
Palavras-chave: Trophic segregation; Tuna; Sooty tern; Pelagic ecosystem; Frigatebird; Booby.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4675.pdf

Observing the ocean interior in support of integrated management
Provedor de dados: 5
Autores: Trenkel, Verena; Handegard, Nils Olav; Weber, Thomas C.
Active- and passive-acoustic methods are widely used tools for observing, monitoring, and understanding marine ecosystems. From 25 to 28 May 2015, 214 scientists from 31 nations gathered for an ICES symposium on Marine Ecosystem Acoustics (SoME Acoustics) to discuss three major themes related to acoustic observations of marine ecosystems: (i) recent developments in acoustic and platform technologies; (ii) acoustic characterisation of aquatic organisms, ecosystem structure, and ecosystem processes; and (iii) contribution of acoustics to integrated ecosystem assessments and management. The development of, and access to new instruments, such as broad bandwidth systems, enables insightful ecological studies and innovative management approaches. Unresolved...
Tipo: Text
Palavras-chave: Acoustics; Broadband; Multi-frequency; Passive and active acoustics; Ecosystem approach to management; Ecosystem monitoring; Pelagic ecosystem; Echosounder; Sonar.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00347/45820/45921.pdf

Matching zooplankton abundance and environment in the South Indian Ocean and Southern Ocean
Provedor de dados: 5
Autores: Godet, Claire; Robuchon, Marine; Leroy, Boris; Cotté, Cedric; Baudena, Alberto; Da Silva, Ophélie; Fabri-ruiz, Salomé; Lo Monaco, Claire; Sergi, Sara; Koubbi, Philippe.
Distinguishing regions based on the geographic distribution of both abiotic factors and living organisms is an old but still actual central issue for biogeographers. In the Southern Ocean, the few existing regionalization studies have been carried out either at very large scales or on the relatively small region around the Sub-Antarctic islands of Kerguelen and the Crozet archipelagos. However, regionalization studies at meso-scales (100–300 km) covering the Indian part of the Southern Ocean and adjacent South Indian Ocean are scarce. These waters, ranging from the Subtropical to the polar region, are home to large populations of well-studied top predators that depend on the biomass of less known mid-trophic level species such as zooplankton. To fill those...
Tipo: Text
Palavras-chave: Bioregionalization; Southern Ocean; Indian Ocean; Pelagic ecosystem; Zooplankton; Continuous plankton recorder.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00643/75474/76309.pdf

Approche systémique des potentialités de production secondaire pélagique: inférences de fluctuations interannuelles
Provedor de dados: 5
Autores: Bergeron, Jean-pierre.
Une méthode d'estimation des potentialités de production secondaire pélagique est proposée, tirant profit de l'homologie interspécifique de certains processus métaboliques élémentaires. Elle consiste à mesurer l'activité de l'aspartate transcarbamylase (A TC), enzyme contribuant à la biosynthèse de composants de base des acides nucléiques, sur des échantillons du peuplement mésozooplanctonique total. L'exécution de onze campagnes au cours des périodes printanières de trois. années consécutives, de 1978 à 1980, a permis d'appliquer cette approche à un écosystème néritique de région tempérée, situé au large de la côte nord de la Bretagne (Manche occidentale). Les onze séries de données ainsi acquises prêtent à caractériser les traits essentiels de...
Tipo: Text
Palavras-chave: Aspartate transcarbamylase; Écosystème pélagique; Manche; Production; Zooplancton; Aspartate transcarbamylase; Pelagic ecosystem; English Channel; Production; Zooplankton.
Ano: 1986
URL: https://archimer.ifremer.fr/doc/00072/18315/15884.pdf

Monitoring small pelagic fish in the Bay of Biscay ecosystem, using indicators from an integrated survey
Provedor de dados: 5
Autores: Doray, Mathieu; Petitgas, Pierre; Huret, Martin; Duhamel, Erwan; Romagnan, Jean-baptiste; Authier, Matthieu; Dupuy, Christine; Spitz, Jerome.
This paper is a practical contribution to two important debates raised by the implementation of marine ecosystem based management: (i) which ecosystem data can be provided by a fisheries survey optimised for ecosystem monitoring; and (ii) how to combine/select potential indicators to derive useful information on marine ecosystem status and dynamics? A suite of 143 potential indicators, including spatial indices, representing small pelagic fish and their biotic and abiotic environments are presented. Indicators were routinely derived from the PELGAS integrated ecosystem survey conducted in spring in the Bay of Biscay (BoB). The general patterns over time in this suite of 5–16 years, non-stationary time series are characterised using a methodology based on...
Tipo: Text
Palavras-chave: Min/max autocorrelation factors; Time correlation; Survey-based indicators; Marine Strategy Framework Directive; Ecosystem variability; Bay of Biscay; Pelagic ecosystem.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00414/52552/53443.pdf

Investigating the coupling between small pelagic fish and marine top predators using data collected from ecosystem-based surveys
Provedor de dados: 5
Autores: Certain, G.; Masse, Jacques; Van Canneyt, O.; Petitgas, Pierre; Doremus, G.; Santos, M. B.; Ridoux, Vincent.
The present study is a general multivariate analysis of the spatial association between small pelagic fishes and their predators (seabirds, marine mammals and fisheries), using 6 yr (18000 km) of transects surveyed in spring in the Bay of Biscay, France. We describe 4 groups of prey-predator association, with explicit distinction of prey size: (1) terns and anchovies (10 to 15 cm), (2) common dolphins, common murres, sprat and sardine (&lt;20 cm), (3) gannets, horse mackerel and mackerel (15 to 25 cm) and (4) bottlenose dolphin, horse mackerel and mackerel (25 to 40 cm). Our analysis also illustrates the great variability in these associations, with years of strong prey-predator associations followed by years of weak relationships. The analysis allows us...
Tipo: Text
Palavras-chave: Marine top predators; Small pelagic fishes; Spatial associations; Temporal variability; Pelagic ecosystem; Bay of Biscay.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00031/14257/11540.pdf

Stable isotopes reveal the trophic position and mesopelagic fish diet of female southern elephant seals breeding on the Kerguelen Islands
Provedor de dados: 5
Autores: Cherel, Y; Ducatez, S; Fontaine, C; Richard, Patrice; Guinet, C.
Trophic interactions between organisms are the main drivers of ecosystem dynamics, but scant dietary information is available for wide-ranging predators during migration. We investigated feeding habits of a key consumer of the Southern Ocean, the southern elephant seal Miroungia leonina, by comparing its blood delta(13) C and delta N-15 values with those of various marine organisms, including crustaceans, squid, fishes, seabirds and fur seals. At the end of winter, delta C-13 values (-23.1 to -20.1 parts per thousand)indicate that female elephant seals forage mainly in the vicinity of the Polar Front and in the Polar Frontal Zone. Trophic levels derived from delta N-15 values (trophic level = 4.6) show that the southern elephant seal is a top consumer in...
Tipo: Text
Palavras-chave: Squid; Southern Ocean; Pelagic ecosystem; Myctophid; Mesopelagic fish; Cephalopod.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-5021.pdf

The PELGAS survey: ship-based integrated monitoring of the Bay of Biscay pelagic ecosystem
Provedor de dados: 5
Autores: Doray, Mathieu; Petitgas, Pierre; Romagnan, Jean-baptiste; Huret, Martin; Duhamel, Erwan; Dupuy, Christine; Spitz, Jerome; Authier, Matthieu; Sanchez, Florence; Berger, Laurent; Doremus, Ghislain; Bourriau, Paul; Grellier, Patrick; Masse, Jacques.
The Pélagiques Gascogne (PELGAS) integrated survey has been developed by a multidisciplinary team of Ifremer and La Rochelle University scientists since 2000, joined by commercial fishermen in 2007. Its initial focus was to assess the biomass and predict the recruitment success of anchovy in the Bay of Biscay in spring. Taking advantage of the space and versatility of R/V Thalassa II, sampling has been progressively extended to other ecosystem components. PELGAS therefore further developed the second objective of monitoring and studying the dynamic and diverse Biscay pelagic ecosystem in springtime. The PELGAS survey model has allowed for the establishment of a long-term time-series of spatially-explicit data of the Bay of Biscay pelagic ecosystem since...
Tipo: Text
Palavras-chave: Pelagic ecosystem; Integrated ecosystem monitoring survey; Marine Strategy Framework Directive; Ecosystem variability; Bay of Biscay; Fishing vessels.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00407/51801/52401.pdf