Impacts of environmental parameters on the foraging behaviour and breeding success of southern elephant seals from Kerguelen Islands: influence of individual strategies and inter-annual variability
Because time-series relative to foraging ecology, environmental parameters and population trends are scarce, few studies focused on the mechanisms linking oceanographic variables with the foraging behaviour and breeding success in marine top predators. This PhD thesis aims to assess the effects of i...
| Main Author: | |
|---|---|
| Other Authors: | , , , , |
| Format: | Doctoral or Postdoctoral Thesis |
| Language: | English |
| Published: |
HAL CCSD
2020
|
| Subjects: | |
| Online Access: | https://hal.archives-ouvertes.fr/tel-03163777 https://hal.archives-ouvertes.fr/tel-03163777/document https://hal.archives-ouvertes.fr/tel-03163777/file/MESTRE_Julie.pdf |
| Summary: | Because time-series relative to foraging ecology, environmental parameters and population trends are scarce, few studies focused on the mechanisms linking oceanographic variables with the foraging behaviour and breeding success in marine top predators. This PhD thesis aims to assess the effects of inter-annual environmental conditions and individual strategies on the foraging ecology and breeding success of the southern elephant seal (Mirounga leonina), a key species of the Southern Ocean. The simultaneous analysis of stable isotopes and tracking-diving time-series highlighted that the foraging habitats, as well as the diving- and foraging behaviour of female seals, remained stable over the last fourteen years. This thesis also revealed a consistency in the utilization proportion of the Antarctic and sub-Antarctic foraging habitats. The body condition of female seals tend to improve less when they exploit the latter habitat, and the corresponding weaning mass of their pups, considered as a proxy of the breeding success, was globaly higher but tended to decrease over the study period. A difference in habitat quality was detected between the areas located east and west of the Kerguelen archipelago, with the area located west providing higher foraging and breeding success. Moreover, a structuration in foraging habitat and breeding success was highlighted between two colonies (i.e. breeding sites) located at Kerguelen Island. Despite consistency in the behaviour of female seals, an overall improvement in body condition was assessed over the study period. Combined with a global decrease in δ13C values, this result suggests that some modifications are occurring in the food webs of the Southern Ocean. En raison du manque de séries temporelles associant écologie en mer, paramètres océanographiques, et trajectoires démographiques, peu d’études se sont intéressées aux mécanismes reliant conditions océanographiques, succès alimentaire à l’échelle des trajets en mer, et succès reproducteur associé chez des prédateurs ... |
|---|