Ontogeny of Diving Behaviour in the Galápagos Fur Seal

  title={Ontogeny of Diving Behaviour in the Gal{\'a}pagos Fur Seal},
  author={Markus Horning and Fritz Trillmich},
We studied the ontogeny of diving behaviour in the Galapagos fur seal (Arctocephalus galapagoensis, Heller 1904). Six-month-old seals spent less than 12% of observation time at sea and were entirely dependent on maternal milk for nutrition. Maximum dive depths for this age group averaged 5.6 m, maximum durations 50 s (N = 12). Modal swim speeds averaged 0.55 m/s; maximum observed swim speeds ranged from 0.9-2 m/s (N = 5). Six-month-old seals swam distances of 2.9 km/24 hrs on average (N = 5… 
The ontogeny of diving behaviour in New Zealand fur seal pups (Arctocephalus forsteri)
In general, pups dived successively deeper between June and September, and the aver- age number of dives per day, dive frequency, and vertical distance travelled increased, and several measures of diving perfor- mance also increased.
Development of diving capacity in emperor penguins.
Monitoring of diving activity in juvenile penguins fitted with satellite-linked time/depth recorders and developmental changes in body mass, hemoglobin concentration, myoglobin content and muscle citrate synthase and lactate dehydrogenase activities suggests that the increase in diving capacity of juveniles at sea will be most dependent on changes in these factors.
Diving ontogeny and lunar responses in a highly migratory mammal, the northern fur seal Callorhinus ursinus
Findings indicate that prey accessibility, particularly for younger pups with reduced diving capacity, may prove more challenging during higher lunar illumination periods, as pups likely mim- icked the behaviour of their vertically migrating prey.
Diving behavior of immature Steller sea lions (Eumetopias jubatus)
Yearling sea lion movement and dive characteristics suggest that immature Steller sea lions are as capable of making the same types of movements as adults as adults.
Seasonal diving behaviour in lactating subantarctic fur seals on Amsterdam Island
Although dive frequency did not vary, the vertical travel distance and the time spent diving increased throughout the study period, while the post-dive interval decreased, indicating that subantarctic fur seals showed a greater diving effort in winter, compared to earlier seasons.
The physiological and behavioural development of diving in Australian fur seal (Arctocephalus pusillus doriferus) pups
While Australian fur seal pups approaching the age of weaning are able to reach similar depths as adult females, they do not have the physiological capacity to remain at these depths for sufficient durations to exploit them to the same efficiency.
Ontogeny of swimming and diving in northern fur seal (Callorhinus ursinus) pups
Time spent in the water and diving behavior of northern fur seal pups were monitored between birth and weaning at St. Paul Island, Alaska, suggesting that pups had earlier been constrained to remain on shore by their undeveloped thermoregulatory capabilities.
Ontogeny of diving behaviour in the Australian sea lion: trials of adolescence in a late bloomer.
Although benthic prey are less influenced by seasonal fluctuations and oceanographic perturbations than epipelagic prey, demersal fishery trawls may impact juvenile survival by disrupting habitat and removing larger size classes of prey.
Movements and diving behavior of weaned Weddell seal (Leptonychotes weddellii ) pups
Routes followed suggest that pups can use the pack ice habitat, but prefer to remain closer to the coastline than do adults.
Diving patterns of breeding female rockhopper penguins (Eudyptes chrysocome): Noir Island, Chile
It is confirmed that the diving behaviour of rockhopper penguins varies as a function of the physical and biological characteristics of the foraging areas and of the particular stage of the breeding season.


Diving in ringed seal (Phoca hispida) pups during the nursing period
Activity and diving performance of nursing ringed seal pups were quantified using time–depth recorders and the large proportion of time spent in the water, the development of...
Diving activity in nursing bearded seal (Erignathus barbatus) pups
The pups spent more time in the water and increased the number of long dives and the mean dive duration with age, as well as the duration of haul-out intervals where nursing could take place.
Mass transfer efficiency between harp seal (Phoca groenlandica) mothers and their pups during lactation
Consistent with the high efficiency of mass transfer, harp seal females contribute less of their total body mass to nursing (c. 28%) than most other phocids examined.
Maternal investment in otariid seals and walruses
There was a strong positive interspecific allometric relationship between mass at birth and maternal mass for otariid species and the slope of this relationship was significantly different from that for phocid species.
Diving and foraging in the Western Grebe
We recorded the duration of successive dives, and pauses on the surface between dives, of foraging Western Grebes Aechmophorus occidentalis at Duck Lake, near Creston, British Columbia. Overall, the
The Behavioral Ecology of Maternal Effort in Fur Seals and Sea Lions
The flexibility of the rearing strategy of temperate and tropical species permits mothers to adjust phenotypically to variance in food availability thus partly masking the theoretically expected trade-offs in the life history of these species.
The Influence of Weaning on Prey‐catching Behaviour in Kittens
Abstract and Summary A relationship between weaning and prey-catching in kittens was postulated on the basis of their change in diet from mother's milk to fresh meat during weaning and the possible
Maternal investment and neonatal growth in phocid seals
Although data are limited, it appears that maternal investment differs between the sexes in all species which are sexually dimorphic with respect to body size.
Haematological and rheological characteristics of blood in seven marine mammal species: physiological implications for diving behaviour
It is suggested that marine mammal species with the greatest adaptation for increased oxygen stores via increased haematocrit have the capacity for deep, long-duration dives, but a limited oxygen transport capacity, and that this compromise precludes fast sustainable swimming behaviour in these species.
Up to the age of 1 yr, age was the best predictor for blood values, thereafter mass needed to be a better predictor; female juveniles between the ages of 150 and 600 d had higher blood values than same-age males.