Population abundance and growth rate of western gray whales Eschrichtius robustus
نویسندگان
چکیده
منابع مشابه
Population abundance and growth rate of western gray whales Eschrichtius robustus
The western population of gray whales Eschn'chtius robustus is one of the most endangered whale populations in the world. Recent studies of this population off the northeastern coast of Sakhalin Island, Russia, have produced a photographic dataset that was utilized for the first markrecapture assessment of western gray whale abundance. Given encounter histories of 129 individually identified wh...
متن کاملSurvival Estimates of Western Gray Whales Eschrichtius robustus Incorporating Individual Heterogeneity and Temporary Emigration
Gray whales Eschrichtius robustus exist as 2 geographically and genetically distinct populations in the eastern and western North Pacific. Subjected to intensive commercial whaling during the 19th and 20th centuries, the western population presently numbers approximately 100 individuals and is regarded as one of the most endangered baleen whale populations in the world. Since 1997, ongoing stud...
متن کاملMitochondrial and nuclear genetic variation across calving lagoons in Eastern North Pacific gray whales (Eschrichtius robustus).
Accurate knowledge of population structure in cetaceans is critical for preserving and managing breeding habitat, particularly when habitat is not uniformly protected. Most eastern gray whales return to their major breeding range each winter along the Pacific coast of Baja California, Mexico, concentrating in 3 major calving lagoons, but it is unknown whether genetic differences exist between l...
متن کاملChanges in the acoustic behavior of gray whales Eschrichtius robustus in response to noise
Gray whales Eschrichtius robustus, while engaged in underwater signaling, circumvented noise in their environment by altering the structure and timing of their calls. Acoustic responses of whales to both naturally occurring and artificially increased levels of noise were documented during sound playback experimentation in San Ignacio Lagoon, Baja California Sur, Mexico. Nine acoustic parameters...
متن کاملThe Effect of Climate Variability on Gray Whales (Eschrichtius robustus) within Their Wintering Areas
The environmental conditions of the breeding and feeding grounds of the gray whale (Eschrichtius robustus) fluctuates at inter-annual scales in response to regional and basin climate patterns. Thus, the goals of this study were to assess if there are any relationships between summer sea ice on their feeding ground and counts of gray whale mother-calf (MC) pairs at Ojo de Liebre Lagoon (OLL); an...
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ژورنال
عنوان ژورنال: Endangered Species Research
سال: 2008
ISSN: 1863-5407,1613-4796
DOI: 10.3354/esr00106