Gray whale migration patterns through the Southern California Bight from multi-year visual and acoustic monitoring

Gray whale migration patterns through the Southern California Bight from multi-year visual and acoustic monitoring

Sightings and acoustic recordings from eastern North Pacific gray whales in the Southern California Bight were analyzed for interannual changes and compared with concurrent environmental measurements during 7 migration seasons (2008−2009 to 2014−2015). Acoustic call counts recorded on an offshore hy...

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Veröffentlicht in:Marine ecology. Progress series (Halstenbek) 2019-08, Vol.625, p.181-203
Hauptverfasser: Guazzo, Regina A., Schulman-Janiger, Alisa, Smith, Michael H., Barlow, Jay, D’Spain, Gerald L., Rimington, Dennis B., Hildebrand, John A.
Format: Artikel
Sprache:eng
Schlagworte:
Acoustics
Additives
Anthropogenic factors
Aquatic mammals
Biological clocks
Environmental changes
Eschrichtiidae
Growth rate
Human influences
Hydrophones
Ice environments
Instinct
Marine mammals
Offshore
Polar environments
Population number
Sea ice
Surveys
Water temperature
Whales
Whales & whaling
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Beschreibung
Zusammenfassung:Sightings and acoustic recordings from eastern North Pacific gray whales in the Southern California Bight were analyzed for interannual changes and compared with concurrent environmental measurements during 7 migration seasons (2008−2009 to 2014−2015). Acoustic call counts recorded on an offshore hydrophone were highly variable from year to year. Assuming an average calling rate of 7.5 calls whale–1 d–1, the estimated number of whales migrating by this hydrophone would be
ISSN:0171-8630
1616-1599
DOI:10.3354/meps12989