Winter and spring diving behavior of bowhead whales relative to prey

Animal Biotelemetry

Mads Peter Heide-Jørgensen²  Kristin L Laidre³  Nynne H Nielsen²  Rikke G Hansen²  Anders Røstad¹ 

[1] Department of Biosciences, University of Oslo, PO Box 1066, Blindern N-0316, Oslo, Norway

[2] Greenland Institute of Natural Resources, Box 570, Nuuk 3900, Greenland

[3] Polar Science Center, Applied Physics Laboratory, University of Washington, 1013 NE 40th Street, Seattle, WA 98105, USA

关键词: Diving behavior;    FastLoc GPS tags;    Feeding;    Greenland;    Arctic;    Copepods;    Calanus;    Bowhead whale;   

Others  :  790990
DOI  :  10.1186/2050-3385-1-15

 received in 2013-04-16, accepted in 2013-08-13,  发布年份 2013

【 摘 要 】

Background

Little is known about bowhead whale (Balaena mysticetus) foraging behavior and what concentrations of prey are required to balance the energetic trade-offs of feeding. We used satellite telemetry, archival depth recorders, and water column echo sounding data to study bowhead whale diving behavior relative to prey depth and concentration in Disko Bay, West Greenland.

Results

Between March and May 2008 to 2011, nine bowhead whales were tagged in Disko Bay, West Greenland with instruments that collected data on location and diving over a period of 1 to 33 days. The frequency of U-dives (presumed to be foraging dives) was low during winter months but more than doubled in spring concurrent with a decrease in diving depth. The mean speed of the horizontal bottom phase of the U-dives was 0.9 ms^-1 and on average, whales spent 37% of their time at the bottom phase of the dive. In March, bowhead whales presumably fed on copepods (Calanus spp.) close to the seabed (between 100 and 400 m). In April and May, after the copepods ascended to shallower depths, bowhead whales also dove to shallower depths (approximately 30 m) more often. However, echo sounding surveys in the vicinity of feeding whales in early May indicated that patches of copepods could still be found close to the seabed.

Conclusions

There was a marked change in diving behavior from winter through spring and this was likely in response to the changes in sea ice conditions, primary production and potential copepod abundance in the upper part of the water column. Depth and duration of dives changed significantly during this period; however, other dive parameters (for example the proportion of time spent feeding on the bottom of U-dives) remained fairly constant indicating a constant feeding effort. Bowhead whales target copepods at or close to the seabed in winter months in Disko Bay and continue feeding on copepods when they migrate to the surface. However, bowhead whales leave West Greenland before peak abundance of copepods occurs at the surface.

【 授权许可】

   
2013 Heide-Jørgensen et al.; licensee BioMed Central Ltd.

【 图 表 】

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【 参考文献 】

• [1]Heide-Jørgensen MP, Laidre KL, Wiig Ø, Postma L, Dueck L, Bachmann L: Large scale sexual segregation of bowhead whales. Endang Species Res 2011, 13:73-78.
• [2]Laidre KL, Heide-Jørgensen MP, Nielsen TG: Role of bowhead whale as a predator in West Greenland. Mar Ecol Prog Ser 2007, 346:285-297.
• [3]Laidre KL, Heide-Jørgensen MP: Spring partitioning of Disko Bay, West Greenland, by Arctic and Subarctic baleen whales. ICES J Mar Sci 2012, 69:1226-1233.
• [4]Stafford KM, Moore SE, Laidre KL, Heide-Jørgensen MP: Bowhead whale springtime song off West Greenland. J Acoust Soc Am 2008, 125:3315-3323.
• [5]Wiig Ø, Heide-Jørgensen MP, Lindqvist C, Laidre KL, Postma ID, Dueck L, Palsbøll PJ, Bachmann L: Recaptures of genotyped bowhead whales Balaena mysticetusin eastern Canada and West Greenland. Endang Species Res 2011, 14:235-242.
• [6]Heide-Jørgensen MP, Garde E, Nielsen NH, Andersen ON: Biological data from the hunt of bowhead whales in West Greenland 2009 and 2010. J Cetacean Res Manage 2012, 12:329-333.
• [7]Heide-Jørgensen MP, Laidre KL, Logsdon ML, Nielsen TG: Springtime coupling between phytoplankton, sea ice, and sea surface temperature in Disko Bay, West Greenland. Prog Oceanogr 2007, 73:79-95.
• [8]Madsen SD, Nielsen TG, Hansen BW: Annual population development and production by Calanus finmarchicus, C. glacialis and C. hyperboreus in Disko Bay, western Greenland. Mar Biol 2001, 139:75-93.
• [9]Baumgartner MF, Mate BR: Summertime foraging ecology of North Atlantic right whales. Mar Ecol Prog Ser 2003, 264:123-135.
• [10]Houston AI, Carbone C: The optimal allocation of time during the diving cycle. Behav Ecol 1992, 3:255-265.
• [11]Werth AJ: Models of hydrodynamic flow in the bowhead whale filter feeding apparatus. J Exp Biol 2004, 207:3569-3580.
• [12]Kenney RD, Hyman MAM, Owen RE, Scott GP, Winn HE: Estimation of prey densities required by North Atlantic right whales. Mar Mam Sci 1986, 2:1-13.
• [13]Benoit-Bird KJ, Battaile BC, Heppell SA, Hoover B, Irons D, Jones N, Kuletz KJ, Nordstrom CA, Paredes R, Suryan RM, Waluk CM, Trites AW: Prey patch patterns predict habitat use by top marine predators with diverse foraging strategies. PloS ONE 8:e53348. 10.1371/journal.pone.0053348
• [14]Swalethorp R, Kjellerup S, Dünweber M, Nielsen TG, Møller EF, Rysgaard S, Hansen BW: Grazing, egg production, and biochemical evidence of differences in the life strategies of Calanus finmarchicus, C. glacialis and C. hyperboreus in Disko Bay, western Greenland. Mar Ecol Prog Ser 2011, 429:125-144.
• [15]Moore S, Craig George JC, Sheffield G, Bacon J, Ashjian C: Bowhead whale distribution and feeding near Barrow, Alaska, in late summer 2005–06. Arctic 2010, 63:195-205.
• [16]Le Boeuf BJ, Costa DP, Huntley AC, Feldkamp SD: Continous, deep diving in female northern elephant seals, Mirounga angustirostris. Can J Zool 1988, 66:446-458.
• [17]Nowacek DP, Johnson MP, Tyack P, Shorter KA, McLellan WA, Pabst DA: Buoyant balaenids: the ups and downs of buoyancy in right whales. Proc R Soc Lond 2001, B268:1811-1816.
• [18]Jakobsson M, Macnab R, Mayer L, Anderson R, Edwards M, Hatzky J, Schenke HW, Johnson P: An improved bathymetric portrayal of the Arctic Ocean: Implications for ocean modeling and geological, geophysical and oceanographic analyses. Geophys Res Let 2008, 35:L07602.