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    Depredating sperm whales in the Gulf of Alaska: local habitat use and long distance movements across putative population boundaries

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    Author
    Straley, Janice M.
    Schorr, G. S.
    Thode, A. M.
    Calambokidis, J.
    Lunsford, C. R.
    Chenoweth, Ellen M.
    O'Connell, V. M.
    Andrews, R. D.
    Keyword
    Sperm whales
    Satellite tags
    Shelf
    Slope
    Ocean basin
    Rate of horizontal movement
    Demersal longlines
    Depredation
    Metadata
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    URI
    http://hdl.handle.net/11122/11918
    Abstract
    Satellite tags were attached to 10 sperm whales Physeter macrocephalus (1 whale was tagged in 2 different years) to determine the movements of sperm whales involved in removal of sablefish from longline fishing gear in the Gulf of Alaska (GOA). Tags transmitted from 3 to 34 d (median = 22) in 2007 and 7 to 158 d (median = 45) in 2009. Seven whales stayed in the GOA; all were associating with fishing vessels along the slope. Two whales headed south in June shortly after being tagged; one reached the inner third of the Sea of Cortez; the other’s last location was offshore Mexico at 14°N. A third whale stayed in the GOA until October and then headed south, reaching central Baja, Mexico, 158 d after tagging. The whales that travelled to lower latitudes followed no pattern in timing of departure, and at least 2 had different destinations. All whales passed through the California Current without stopping and did not travel to Hawaii; both are areas with known concentrations of sperm whales. Whales travelled faster when south of 56°N than when foraging in the GOA (median rate of median horizontal movement = 5.4 [range: 4.1 to 5.5] and 1.3 [range: 0.6 to 2.5] km h−1, respectively). Tagged sperm whales primarily travelled over the slope, but one spent considerable time over the ocean basin. Information on the timing and movement patterns of sperm whales may provide a means for fishermen to avoid fishing at whale hot spots, potentially reducing interactions between whales and fishermen.
    Date
    2014-05-08
    Source
    Endangered Species Research
    Publisher
    Inter-Research Science Publisher
    Type
    Article
    Peer-Reviewed
    Yes
    Citation
    Straley, J. M., Schorr, G. S., Thode, A. M., Calambokidis, J., Lunsford, C. R., Chenoweth, E. M., ... & Andrews, R. D. (2014). Depredating sperm whales in the Gulf of Alaska: local habitat use and long distance movements across putative population boundaries. Endangered Species Research, 24(2), 125-135.
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    Straley, Janice

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