Publications des scientifiques de l'IRD

Della Penna A., De Monte S., Kestenare Elodie, Guinet C., d'Ovidio F. (2015). Quasi-planktonic behavior of foraging top marine predators. Scientific Reports - Nature, 5, p. art. 18063 [10 p.]. ISSN 2045-2322.

Titre du document
Quasi-planktonic behavior of foraging top marine predators
Année de publication
2015
Type de document
Article référencé dans le Web of Science WOS:000366392300001
Auteurs
Della Penna A., De Monte S., Kestenare Elodie, Guinet C., d'Ovidio F.
Source
Scientific Reports - Nature, 2015, 5, p. art. 18063 [10 p.] ISSN 2045-2322
Monitoring marine top predators is fundamental for assessing the health and functioning of open ocean ecosystems. Although recently tracking observations have substantially increased, factors determining the horizontal exploration of the ocean by marine predators are still largely unknown, especially at the scale of behavioral switches (1-100 km, days-weeks). It is commonly assumed that the influence of water movement can be neglected for animals capable of swimming faster than the current. Here, we challenge this assumption by combining the use of biologging (GPS and accelerometry), satellite altimetry and in-situ oceanographic data (ADCP and drifting buoys) to investigate the effect of the mesoscale ocean dynamics on a marine predator, the southern elephant seal. A Lagrangian approach reveals that trajectories of elephant seals are characterized by quasi-planktonic bouts where the animals are horizontally drifting. These bouts correspond to periods of increased foraging effort, indicating that in the quasi-planktonic conditions energy is allocated to diving and chasing, rather than in horizontal search of favourable grounds. These results suggest that mesoscale features like eddies and fronts may act as a focal points for trophic interactions not only by bottom-up modulation of nutrient injection, but also by directly entraining horizontal displacements of the upper trophic levels.
Plan de classement
Ecologie, systèmes aquatiques [036]
Description Géographique
KERGUELEN ; OCEAN AUSTRAL
Localisation
Fonds IRD [F B010065663]
Identifiant IRD
fdi:010065663
Contact