Hunting Behavior of a Marine Mammal Beneath the Antarctic Fast Ice

Davis, Randall W.; Fuiman, Lee A.; Williams, Terrie M.; Collier, Stuart; Hagey, William; Kanatous, Shane B.; Kohin, Suzanne; Horning, Markus

doi:10.1126/science.283.5404.993

Cited by 276 publications

(256 citation statements)

References 21 publications

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“…2a). The use of a backlighting effect to detect and capture prey has been observed in Weddell seals Leptonychotes weddellii (Davis et al 1999). Additionally, attacks on Comephorus spp.…”

Section: Discussionmentioning

confidence: 99%

Foraging tactics of Baikal seals differ between day and night

Watanabe

Baranov²,

Sato³

et al. 2004

Mar. Ecol. Prog. Ser.

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Some pinniped species appear to forage during both daylight and darkness. To determine any differences in the foraging tactics between day and night, we attached data loggers with a newly developed time-scheduled release system to 2 free-ranging female Baikal seals Phoca sibirica. The system released the loggers from the seals 24 h after deployment, and allowed us to retrieve the loggers via VHF radio signals. We obtained the first time-series diving data on Baikal seals. The seals dived almost continuously, to an average of 68.9 m, with dives deeper than this (>150 m) being concentrated around dusk and dawn. They showed distinctly different diving patterns between day and night in terms of swimming speed profile and the sequential pattern in maximum dive depth . In the daytime, dives were characterized by higher swimming speeds (mean 1.2 m s -1 ) and upward-directed acceleration events. At night, dives were shallower around midnight and characterized by lower speeds (mean 0.9 m s -1 ) and undirectional deceleration events. We suggest that these differences reflect predation on pelagic fishes by seals using visual cues during the day and predation on swarming crustaceans by seals using tactile cues at night.

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“…2a). The use of a backlighting effect to detect and capture prey has been observed in Weddell seals Leptonychotes weddellii (Davis et al 1999). Additionally, attacks on Comephorus spp.…”

Section: Discussionmentioning

confidence: 99%

Foraging tactics of Baikal seals differ between day and night

Watanabe

Baranov²,

Sato³

et al. 2004

Mar. Ecol. Prog. Ser.

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“…DSTs have also been used in conjunction with integrated video and audio systems to simultaneously examine animal-environment linkages by examining the interaction between space use patterns and animal behaviour such as locomotor effort, social interactions and hunting behaviour (Marshall, 1998 andHeithaus et al, 2001 for tiger sharks; Davis et al, 1999 and for seals). So far, such systems have only been applied to large vertebrates such as sharks, cetaceans and pinnipeds but in the future, micro-cameras with smaller batteries and longer life will no doubt provide new insights into the behavioral and physiological interactions of small-bodied animals with their environment.…”

Section: Juveniles and Adultsmentioning

confidence: 99%

Movements of Marine Fish and Decapod Crustaceans: Process, Theory and Application

Pittman

McAlpine

2003

Advances in Marine Biology

219

178

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“…Seals in general, and especially the harp seal (Pagophilus groenlandicus), are known to be very vocal (Hanggi and Schusterman, 1994;Rogers et al, 1996). Also, they are known to rely on both chemical and tactile signals as well as their vision (Kovacs, 1987;Davis et al, 1999;Dehnhardt et al, 2001).…”

mentioning

confidence: 99%

A Neurological Comparative Study of the Harp Seal (Pagophilus groenlandicus) and Harbor Porpoise (Phocoena phocoena) Brain

Walløe

Eriksen

Dabelsteen

et al. 2010

The Anatomical Record

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The cetacean brain is well studied. However, few comparisons have been done with other marine mammals. In this study, we compared the harp seal (Pagophilus groenlandicus) and the harbor porpoise brain (Phocoena phocoena). Stereological methods were applied to compare three areas of interest: the entire neocortex and two subdivisions of the neocortex, the auditory and visual cortices. The total number of neurons and glial cells in the three regions was estimated. The main results showed that the harbor porpoise have an estimated 14.9 Â 10 9 neocortical neurons and 34.8 Â 10 9 neocortical glial cells, whereas the harp seal have 6.1 Â 10 9 neocortical neurons and 17.5 Â 10 9 neocortical glial cells. The harbor porpoise have significantly more neurons and glial cells in the auditory cortex than in the visual cortex, whereas the pattern was opposite for the harp seal. These results are the first to provide estimates of the number of neurons and glial cells in the neocortex of the harp seal and harbor porpoise brain and offer new data to the comparative field of mammalian brain evolution. Anat Rec, 293:2129Rec, 293: -2135

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Hunting Behavior of a Marine Mammal Beneath the Antarctic Fast Ice

Cited by 276 publications

References 21 publications

Foraging tactics of Baikal seals differ between day and night

Foraging tactics of Baikal seals differ between day and night

Movements of Marine Fish and Decapod Crustaceans: Process, Theory and Application

A Neurological Comparative Study of the Harp Seal (Pagophilus groenlandicus) and Harbor Porpoise (Phocoena phocoena) Brain

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