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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 |
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Dhurmeea, Zahirah; Pethybridge, Heidi; Langlais, Clothilde; Somes, Christopher J.; Nikolic, Natacha; Bourjea, Jerome; Appadoo, Chandani; Bodin, Nathalie. |
Albacore tuna (Thunnus alalunga) is a highly economically important species in the western Indian Ocean. However, knowledge of its ecological and nutritional characteristics, essential for proper management of the species, is lacking in the region. The trophodynamics of the Indian Ocean albacore was thus examined using known fatty acid trophic markers (FATMs) of primary producers, nutritional condition indices (NCIs) (omega-3/omega-6 ratio and total fatty acid content (TFA)), and baseline and lipid corrected stable isotope of carbon (δ13Ccorr) and nitrogen (δ15Ncorr), measured in the muscle tissue. We applied generalized additive mixed models to understand the spatiotemporal patterns and drivers of these tracers, taking into consideration several intrinsic... |
Tipo: Text |
Palavras-chave: Trophodynamics; Phytoplankton; Environmental parameters; Climate change. |
Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00623/73497/72787.pdf |
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