MOVEMENTS OF NORTH PACIFIC BLUE WHALES DURING THE FEEDING SEASON OFF SOUTHERN CALIFORNIA AND THEIR SOUTHERN FALL MIGRATION1
- 1 October 1999
- journal article
- Published by Wiley in Marine Mammal Science
- Vol. 15 (4) , 1246-1257
- https://doi.org/10.1111/j.1748-7692.1999.tb00888.x
Abstract
The satellite‐acquired locations of 10 blue whales (Balaenoptera musculus) tagged off southern California with Argos radio tags were used to identify (1) their movements during the late summer feeding season; (2) the routes and rate of travel for individuals on their southern fall migration; and (3) a possible winter calving/breeding area. Whales were tracked from 5.1 to 78.1 d and from 393 to 8,668 km. While in the Southern California Bight, most of the locations for individual whales were either clumped or zigzagged in pattern, suggesting feeding or foraging (searching for prey).Average speeds ranged from 2.4 to 7.2 km/h. One whale moved north to Cape Mendocino, and four migrated south along the Baja California, Mexico coast, two passing south of Cabo San Lucas on the same day. One of the latter whales traveled an additional 2,959 km south in 30.5 d to within 450 km of the Costa Rican Dome (CRD), an upwelling feature. The timing of this migration suggests the CRD may be a calving/breeding area for North Pacific blue whales. Although blue whales have previously been sighted in the Eastern Tropical Pacific (ETP), this is the first evidence that whales from the feeding aggregation off California range that far south. The productivity of the CRD may allow blue whales to feed during their winter calving/breeding season, unlike gray whales (Eschrichtius robustus) and humpbacks (Megaptera novaeangliae) which fast during that period.Keywords
This publication has 13 references indexed in Scilit:
- Blue whale habitat and prey in the California Channel IslandsDeep Sea Research Part II: Topical Studies in Oceanography, 1998
- An integrated approch to the foraging ecology of marine birds and mammalsDeep Sea Research Part II: Topical Studies in Oceanography, 1998
- Local and migratory movements of Hawaiian humpback whales tracked by satellite telemetryCanadian Journal of Zoology, 1998
- Local and migratory movements of Hawaiian humpback whales tracked by satellite telemetryCanadian Journal of Zoology, 1998
- Satellite-Monitored Movements of the Northern Right WhaleThe Journal of Wildlife Management, 1997
- Oceanic upwelling and productivity in the eastern tropical PacificLimnology and Oceanography, 1991
- BLUE WHALE (BALAENOPTERA MUSCULUS)DISTRIBUTION IN THE EASTERN TROPICAL PACIFICMarine Mammal Science, 1990
- Distribution of cetaceans and sea-surface chlorophyll concentrations in the California CurrentMarine Biology, 1986
- Parameters relating to the distributions of planktonic organisms, especially euphausiids in the eastern tropical PacificProgress in Oceanography, 1979
- World whale stocksMammal Review, 1976