منابع مشابه
GRAY WHALE (Eschrichtius robustus): Eastern North Pacific Stock
STOCK DEFINITION AND GEOGRAPHIC RANGE The gray whale formerly occurred in the North Atlantic Ocean (Fraser 1970), but is currently only found in the North Pacific (Rice et al. 1984). The following information was considered in classifying stock structure of gray whales based on the Dizon et al. (1992) phylogeographic approach: 1) Distributional data: isolated geographic distribution in the Nort...
متن کاملRest and activity states in a gray whale.
The behaviour of a female gray whale (Eschrichtius robustus) that had been rescued 14 months previously was recorded continuously on a video-recorder for 9 days at 'Sea World' in San Diego. On average, during the first six recording days, active wakefulness accounted for 37.9 +/- 1.7% of each 24 h; transitional stage for 17.4 +/- 1.4% and rest for 41.2 +/- 1.7%. In the rest stage the whale was ...
متن کاملGRAY WHALE (Eschrichtius robustus): Eastern North Pacific Stock
STOCK DEFINITION AND GEOGRAPHIC RANGE The gray whale formerly occurred in the North Atlantic Ocean (Fraser 1970), but is currently only found in the North Pacific (Rice et al. 1984). The following information was cons idered in classifying stock structure of gray whales based on the Dizon et al. (1992) phylogeographic approach: 1) Distributional data: two isolated geographic distributions in th...
متن کاملResting behavior in a rehabilitating gray whale calf
We studied the behavior of a one-year old gray whale calf (Eschrichtius robustus) during its rehabilitation at SeaWorld of San Diego. Several behaviors in this whale were grouped into 3 stages: (1) active wakefulness (mean 37.9 ± 1.7% of 24 hr during 6 consecutive days) included episodes of swimming in the main pool and in the shallow channel; (2) transitional stage (mean 17.4 ±1.4%) was compos...
متن کاملMiocene whale-fall from California demonstrates that cetacean size did not determine the evolution of modern whale-fall communities.
Whale-fall communities support a deep-sea invertebrate assemblage that subsists entirely on the decaying carcasses of large cetaceans. The oldest whale-falls are Late Eocene in age, but these early whale-falls differ in faunal content and host cetacean size from Neogene and Recent whale-falls. Vesicomyid bivalves, for example, are major components of the sulphophilic stage in Miocene and Recent...
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ژورنال
عنوان ژورنال: The American Naturalist
سال: 1888
ISSN: 0003-0147,1537-5323
DOI: 10.1086/274725