This is a subset of a data sets from Kernaléguen et al. (2015).
Format
furseals is an object of class data.frame composed of 1414 observations and 8 variables.
- ID_SITA
Fur seal ID used by Sturbois et al. (under review), from 1 to 47
- ID
Fur seal ID used by Kernaléguen et al. (2015) in the initial data set.
- Species
Fur seal species: the Antarctic fur seal Arctocephalus gazella or the subantarctic fur seal A. tropicalis.
- Sexe
Fur seal gender, either 'Male' or 'Female'.
- Time
Number of the whisker sections from 1 to 30.
- Place
Breeding place: Crozet, Amsterdam or Kerguelen
- d13C
delta 13C value
- d15N
delta 15N value
Details
Briefly, fur seals the Antarctic fur seal Arctocephalus gazella and subantarctic fur seal A. tropicalis whisker SI values yield unique long-term information on individual behaviour which integrates the spatial, trophic and temporal dimensions of the ecological niche. The foraging strategies of this two species of sympatric fur seals were examined in the winter 2001/2002 at Crozet, Amsterdam and Kerguelen Islands (Southern Ocean) using the stable isotope values of serially sampled whiskers. The subset of the initial data set is composed of consecutive whisker sections (3 mm-long) starting from the proximal (facial) end, with the most recently synthesized tissue remaining under the skin. Only individuals (n = 47) with whiskers totalizing at least 30 sections were selected in the initail data, and only those 30 sections were selected.