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- Estimating the adult survival rate of central North Pacific humpback whales (Megaptera novaeangliae),
- We used photo-identification records to estimate annual survival of adult humpback whales (Megaptera novaeangliae) for the central North Pacific stock using models within the software application Program MARK. The analysis is based on 10,567 photographs of 2,400 individual whales taken from 1979 to 1996. The central North Pacific stock winters in Hawai'i and migrates to discrete feeding areas in Alaska for the summer and autumn. The Cormack-Jolly-Seber (CJS) estimate of annual survival based on annual sightings in Hawai'i was 0.963 (95% confidence interval [CI]: 0.944-0.978) and the Pradel estimate was 0.963 (95% CI: 0.944-0.976), with a population rate of increase of 1.10 (95% CI: 1.03-1.16). The best survival estimate for southeastern Alaska whales, based on Barker's model, was 0.957 (95% CI: 0.943-0.967). The best survival estimate for Prince William Sound whales, also based on Barker's model, was 0.984 (95% CI: 0.954-0.995). Whales from the central North Pacific stock mix in Hawai'i; therefore, the best apparent survival estimate for the entire stock is from the pooled Hawai'i data. However, this analysis also demonstrated that we could reduce heterogeneity with Barker's model and obtain more plausible estimates of survival for the whales in discrete feeding areas using semiannual sightings in Hawai'i as opportunistic resightings. © 2004 American Society of Mammalogists., Cited By (since 1996):41, Marine Mammals, Birds & Turtles, CODEN: JOMAA, ,
- Mizroch, Herman, Straley, Glockner-Ferrari, Jurasz, Darling, Cerchio, Gabriele, Salden, Von Ziegesar
- Migratory destinations of humpback whales that feed off California, Oregon and Washington,
- The migratory destinations of humpback whales that feed off California, Oregon and Washington were determined using photo-identification. Fluke photographs of 594 individuals were taken between 1981 and 1992 and compared to collections from 9 wintering regions in the North Pacific: Ogasawara (162) and Okinawa (17) islands of Japan; the Big Island and Maui (634 for both) and Kauai (384) of Hawaii; the Revillagigedo Archipelago (450), the mainland coast (383) and Baja Peninsula (471) of Mexico; and Central America (31). A total of 160 matches were found to 6 central and eastern North Pacific wintering regions, with most from Central America, Baja, and mainland Mexico. Of whales identified off Central America, 84 % were resighted off California-Washington; this high rate of interchange suggests that whales in these tropical waters appear to be comprised entirely of animals from the California-Washington feeding aggregation. Humpback whales seen off Central America were resighted disproportionately off southern California while those from mainland Mexico tended to be seen off northern California-Washington. From 157 same-season migratory transits documented, the shortest were 29 d to Baja and 56 d to Costa Rica and the longest distance was 5322 km. Of the California-Washington whales with known sex, the proportion of males identified at a wintering region was significantly higher than females (2.2:1, p < 0.05)., Cited By (since 1996):21, CODEN: MESED, , , Downloaded from: www.int-res.com/articles/meps/192/m192p295.pdf (9 June 2014).
- Calambokidis, Steiger, Rasmussen, Urbán, Balcomb, Ladrón De Guevara, Salinas, Jacobsen, Baker, Herman, Cerchio, Darling