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  • Blackwell Publishing Ltd  (6)
Document type
Publisher
Years
  • 1
    Electronic Resource
    Electronic Resource
    REBUILDING SEAL STOCKS IN THE KATTEGAT-SKAGERRAK (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Marine mammal science 4 (1988), S. 0 
    Details
    ISSN: 1748-7692
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The harbor seal (Phoca vitulina) population in the Kattegat-Skagerrak area has been dwindling for several centuries due to excessive hunting pressure. Corrected hunting statistics during 1890–1976 are used to estimate changes in population size over the past century. After protection was introduced in the 1960s and 1970s the harbor seal population in the area increased at an exponential rate of 0.12 and exceeded 5,000 animals in 1986. The present rate of population growth is used for modelling the influence of fertility and age-specific mortality. It is found that the observed high rate of increase is only realistic if female fertility rate is very high, the range of juvenile mortality rate is 0.33–0.52 and adult mortality is less than 0.15. Commonly cited higher mortality rates are not realistic in the Kattegat-Skagerrak area.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1748-7692.1988.tb00204.x
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  • 2
    Electronic Resource
    Electronic Resource
    A NEW TECHNIQUE FOR DEPLOYING SATELLITE TRANSMITTERS ON BALEEN WHALES: TRACKING A BLUE WHALE (BALAENOPTERA MUSCULUS) IN THE NORTH ATLANTIC (2001)
    Oxford, UK : Blackwell Publishing Ltd
    Marine mammal science 17 (2001), S. 0 
    Details
    ISSN: 1748-7692
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1748-7692.2001.tb01309.x
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  • 3
    Electronic Resource
    Electronic Resource
    HARBOR SEAL TRACKING AND TELEMETRY BY SATELLITE (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Marine mammal science 5 (1989), S. 0 
    Details
    ISSN: 1748-7692
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: We tested a satellite Platform Transmitter Terminal (PTT) in the laboratory (on a float and on captive seals) and on a free-ranging harbor seal in the Southern California Bight to investigate the utility of satellite telemetry in documenting seals’at-sea behavior and movements. We used records from a microprocessor-based time-depth recorder (TDR) to interpret location and diving records from the PTT. For the free-ranging harbor seal, we obtained at least one uplink during 70% (while the seal was at sea) to 82% (while she was ashore) of satellite passes and at least one location each day. Of 62 locations determined by Service Argos for the free-ranging seal, 20 were verified from TDR records to have been at sea; these indicated that the seal may have ranged up to 48 km from the haul-out site, although most locations were within 5 km. The accuracies of locations calculated when the seal was at sea (±15 km) were substantially less than when it was ashore (±1.5 km), thus limiting at-sea tracking of seals by satellite to rather gross movements. Fewer transmissions were detected and locations calculated when the seal was actively diving than when it was swimming near the surface as it departed from or returned to the haul-out site. Consequently, average dive durations indicated by the PTT were substantially shorter than those calculated from TDR records. Documentation of foraging areas and detailed at-sea movements using satellite technology may not be possible for pinnipeds unless PTT-transmission rates are increased substantially from the 1 per 45 set maximum rate now permitted by Service Argos.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1748-7692.1989.tb00348.x
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  • 4
    Electronic Resource
    Electronic Resource
    AERIAL DIGITAL PHOTOGRAPHIC SURVEYS OF NARWHALS, MONODON MONOCEROS, IN NORTHWEST GREENLAND (2004)
    Oxford, UK : Blackwell Publishing Ltd
    Marine mammal science 20 (2004), S. 0 
    Details
    ISSN: 1748-7692
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Narwhal (Monodon monoceros) abundance in Inglefield Bredning and adjacent fjords in Northwest Greenland was estimated using aerial digital photographic techniques in August 2001 and 2002. Two digital, large-format cameras continuously downloaded images to two laptop computers together with information on position, altitude, pitch, and roll of the aircraft. In 2001 a total of 11,628 images were obtained corresponding to a swept area of 840 km2. The survey of the entire area was repeated four times and produced a count of 360 narwhals on the images or an average abundance in the surveyed area of 873 narwhals (CV = 0.35) at the surface. In 2002 the area was surveyed seven times and approximately 11,402 images were obtained. This corresponded to a swept area of 2,208 km2 with 566 narwhals counted on the images, and an average estimated abundance of 562 narwhals (CV = 0.24) at the surface. Correcting these figures for availability bias (assuming narwhals are submerged deeper than 2 m for 62% of the time) results in abundance estimates of 2,297 (95% CI: 1,472–3,122) in August 2001 and 1,478 (95% CI 1,164–1,793) in August 2002. The uncorrected estimates, when compared to the results of visual line-transect surveys conducted in 1985 and 1986 (Born et al. 1994), show a 10% decline in recent years in the abundance of whales visible at the surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1748-7692.2004.tb01154.x
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  • 5
    Electronic Resource
    Electronic Resource
    Trends and variability of sea ice in Baffin Bay and Davis Strait, 1953–2001 (2003)
    Oxford, UK : Blackwell Publishing Ltd
    Polar research 22 (2003), S. 0 
    Details
    ISSN: 1751-8369
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography , Geosciences
    Notes: The extent and duration of sea ice in Baffin Bay and Davis Strait has a major impact on the timing and strength of the marine production along West Greenland. The advance and retreat of the sea ice follows a predictable pattern, with maximum extent typically in March. We examine the area of sea ice in March in three overlapping study regions centred on Disko Bay on the west coast of Greenland. Sea ice concentration estimates derived from satellite passive microwave data are available for the years 1979-2001. We extend the record back in time by digitizing ice charts from the Danish Meteorological Institute, 1953-1981. There is reasonable agreement between the chart data and the satellite data during the three years of overlap: 1979-1981. We find a significant increasing trend in sea ice for the 49-year period (1953-2001) for the study regions that extend into Davis Strait and Baffin Bay. The cyclical nature of the wintertime ice area is also evident, with a period of about 8 to 9 years. Correlation of the winter sea ice concentration with the winter North Atlantic Oscillation (NAO) index shows moderately high values in Baffin Bay. The correlation of ice concentration with the previous winter's NAO is high in Davis Strait and suggests that next winter's ice conditions can be predicted to some extent by this winter's NAO index.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1751-8369.2003.tb00090.x
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  • 6
    Electronic Resource
    Electronic Resource
    Recent status of bowhead whales, Balaena mysticetus, in the wintering grounds off West Greenland (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Polar research 15 (1996), S. 0 
    Details
    ISSN: 1751-8369
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography , Geosciences
    Notes: Bowhead whales, Balaena mysticetus, belonging to the Davis Strait/Baffin Bay stock, have historically in Baffin Bay and Davis Strait, including waters along the west coast of Greenland in and near the entrance of Disko Bay. Aerial surveys of the Disko Bay region during late winter (1981, 1982, 1990,1991, 1993 and 1994) showed that it was still visited regularly by a few tens of whales. Commercial whaling on bowheads in Baffin Bay and Davis Strait ended in about 1915, but occasional killing continued until as recently as the 1970s. The low numbers of bowheads observed off West Greenland in recent years are consistent with the results of surveys of the summering grounds in the eastern Canadian Arctic, indicating that any recovery has been exceedingly slow. The only conclusion supported by the data is that the current stock size is a small fraction of what it was prior to commercial whaling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1751-8369.1996.tb00463.x
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