Behaviour of ringed seals tagged with satellite transmitters in the North Water polynya during fast-ice formation

Teilmann, Jonas; Born, Erik W.; Acquarone, Mario

doi:10.1139/cjz-77-12-1934

Cited by 29 publications

(49 citation statements)

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“…The mean dive duration of Saimaa ringed seals found in this study is in accordance with the results obtained in an earlier study (Hyvärinen et al 1995) and quite similar to those of ringed seals in the Arctic Wartzok 1996, Teilmann et al 1999) and Baikal seals Phoca sibirica (Stewart et al 1996). Although some dives of these seals have had a maximum duration of about 40 min (Stewart et al 1996, Teilmann et al 1999). In addition, the dive duration of the Saimaa ringed seal increased with body mass, which agrees with similar findings in the arctic ringed seal Wartzok 1996, Teilmann et al 1999).…”

Section: Discussionsupporting

confidence: 82%

“…In this study, only 1.0 to 15.3% of the dives exceeded the calculated tADL. These values are similar to those of ringed seals (0.1-9.6%) in the Arctic (Teilmann et al 1999). However, in the ice-covered period, 18-53% of the dives of ringed seals were reported to exceed the tADL (Kelly and Wartzok 1996).…”

Section: Discussionsupporting

confidence: 68%

“…This nocturnal haul-out by the Saimaa ringed seal is in contrast to the diurnal haul-out pattern of adult arctic ringed seals, which haul-out in daytime during late spring and early summer (Smith and Hammill 1981, Kelly and Quakenbush 1990, Lydersen 1991. Teilmann et al (1999), however, found that arctic ringed seals spent more time on the surface at night and in the morning than in daytime. Clear nocturnal haul-out behaviour has been reported in harbor seals and grey seals (Thompson et al 1991b, Sjöberg et al 1995, 1999.…”

Section: Discussioncontrasting

confidence: 43%

“…Lydersen et al (1992) calculated the theoretical aerobic dive limit (tADL) for different-sized ringed seals, based on body oxygen stores and the assumed metabolic rate during diving. In general, most of the ringed seal's dives are aerobic and the dive times are lower than the calculated tADL (Lydersen 1991, Lydersen et al 1992, Hyvärinen et al 1995, Teilmann et al 1999. In this study, only 1.0 to 15.3% of the dives exceeded the calculated tADL.…”

Section: Discussionmentioning

confidence: 74%

“…In the Arctic, ringed seals have been recorded to occasionally dive deeper than 250 m (Teilmann et al 1999) and the recorded maximum dive depth of the pup is 89 m (Lydersen and Hammill 1993). The actual depth limit for the ringed seal is, however, still unknown.…”

Section: Discussionmentioning

confidence: 99%

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Dive types and circadian behaviour patterns of Saimaa ringed sealsPhoca hispida saimensis during the open-water season

et al. 2002

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2002. Dive types and circadian behaviour patterns of Saimaa ringed seals Phoca hispida saimensis during the open-water season. Acta Theriologica 47: 63-72.Diving and circadian behaviour patterns of 7 free-ranging Saimaa ringed seals Phoca hispida saimensis Nordquist, 1899 were examined by VHF-radiotelemetry during open-water seasons between May and November in Lake Saimaa, eastern Finland. The mean recorded dive duration ranged from 2.8 to 6.5 min, with a maximum of 21 min. The mean dive depth ranged from 9.8 to 15.7 m, with maximum of 39.6 m. The maximum dive depth of each seal was limited by water depth in the study area. The dive depths were positively correlated with dive duration and body mass of the seal. Five different dive types were defined, as based on their depth-time characteristics, each falling into one of the three functional categories: travelling, feeding, and resting. Long duration diving bouts occurred mostly at night and were presumed to be resting dives. Saimaa ringed seals exhibited a circadian pattern of haul-out behaviour that shifted seasonally. During molting (May-June) the seals hauled-out both day and night, but later in summer haul-out was more frequent at night.

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Section: Discussionsupporting

confidence: 82%

Section: Discussionsupporting

confidence: 68%

Section: Discussioncontrasting

confidence: 43%

Section: Discussionmentioning

confidence: 74%

Section: Discussionmentioning

confidence: 99%

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Dive types and circadian behaviour patterns of Saimaa ringed sealsPhoca hispida saimensis during the open-water season

et al. 2002

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From polar night to midnight sun: photoperiod, seal predation, and the diel vertical migrations of polar cod (Boreogadus saida) under landfast ice in the Arctic Ocean

et al. 2010

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The winter/spring vertical distributions of polar cod, copepods, and ringed seal were monitored at a 230-m station in ice-covered Franklin Bay. In daytime, polar cod of all sizes (7-95 g) formed a dense aggregation in the deep inverse thermocline (160-230 m,-1.0 to 0°C). From December (polar night) to April (18-h daylight), small polar cod \25 g migrated into the isothermal cold intermediate layer (90-150 m,-1.4°C) at night to avoid visual predation by shallow-diving immature seals. By contrast, large polar cod (25-95 g), with large livers, remained below 180 m at all times, presumably to minimize predation by deep-diving mature seals. The diel vertical migration (DVM) of small polar cod was precisely synchronized with the light/dark cycle and its duration tracked the seasonal lengthening of the photoperiod. The DVM stopped in May coincident with the midnight sun and increased schooling and feeding. We propose that foraging interference and a limited prey supply in the deep aggregation drove the upward redistribution of small polar cod at night. The bioluminescent copepod Metridia longa could have provided the light needed by polar cod to feed on copepods in the deep aphotic layers.

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Different habitat use strategies by subadult and adult ringed seals (Phoca hispida) in the Bering and Chukchi seas

et al. 2011

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Behaviour of ringed seals tagged with satellite transmitters in the North Water polynya during fast-ice formation

Cited by 29 publications

References 0 publications

Dive types and circadian behaviour patterns of Saimaa ringed sealsPhoca hispida saimensis during the open-water season

Dive types and circadian behaviour patterns of Saimaa ringed sealsPhoca hispida saimensis during the open-water season

From polar night to midnight sun: photoperiod, seal predation, and the diel vertical migrations of polar cod (Boreogadus saida) under landfast ice in the Arctic Ocean

Different habitat use strategies by subadult and adult ringed seals (Phoca hispida) in the Bering and Chukchi seas

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