Movements and diving of bearded seal (Erignathus barbatus) mothers and pups during lactation and post-weaning

Eleven bearded seals (Erignathus barbatus) were tagged with satellite-linke d dive recorders ill Kongsfjorden, Svalbard, Norway, in May 1994. These ani mals included four mother-pup pairs and three single pups. The seals were t racked for 21-258 days. A total of similar to 207,000 dives were recorded. Bearded seal mothers showed limited movements during the nursing and moulti ng periods. After weaning, the pups moved out of the lagging area and dispe rsed coastally. One pup left Svalbard and moved far offshore to Greenland a nd Jan Mayen. Bearded seal adults displayed a bi-modal dive behaviour, with peaks of activity that were shallower than 10 m or from 50 to 70 In. Most dives for adult seals (97%) were shorter than 10 min. Young pups performed dives that were shallower and shorter in duration than their accompanying m others, but diving skills improved rapidly with age. Six of the seven pups dived deeper than 448 m by the time they were 2 months old. Analyses of mov ement data with, respect to separation of mother-pup pairs suggest a lactat ion period of about 24 days.