منابع مشابه
Harbor Porpoise and Fisheries: an Uncertainty Analysis of Incidental Mortality
The harbor porpoise (Phocoena phocoena) in the western North Atlantic is subject to mortality due to entanglement in gillnets. Such incidental mortality threatens a population if it is too large relative to the potential population growth rate. Critical values for incidental mortality have been established by the International Whaling Commission and the U.S. Marine Mammal Protection Act. As in ...
متن کاملCollateral vessels reduce mortality.
Christian Seiler, Pascal Meier, and their co-workers of the University Hospital in Bern, Switzerland, well known for their pioneering clinical work on the collateral circulation of the heart, have described a meta-analysis of 12 studies involving 6529 patients of the role played by the collateral circulation in mortality. The authors come to the conclusion that the ‘coronary collateralization h...
متن کاملUsing paired visual and passive acoustic surveys to estimate passive acoustic detection parameters for harbor porpoise abundance estimates.
Passive acoustic monitoring is a promising approach for monitoring long-term trends in harbor porpoise (Phocoena phocoena) abundance. Before passive acoustic monitoring can be implemented to estimate harbor porpoise abundance, information about the detectability of harbor porpoise is needed to convert recorded numbers of echolocation clicks to harbor porpoise densities. In the present study, pa...
متن کاملPredictions from harbor porpoise habitat association models are confirmed by long-term passive acoustic monitoring.
Survey based habitat association models provide good spatial coverage, but only a snapshot in time of a species' occurrence in a particular area. A habitat association model for harbor porpoises was created using data from five visual surveys of the Moray Firth, Scotland. Its predictions were tested over broader temporal scales using data from static passive acoustic loggers, deployed in two co...
متن کاملZigzag transect survey by towed passive acoustic method for finless porpoise in the Yangtze River
Accurate estimation of abundance is one of the most important tasks for conservation and management of the endangered species. However, the population estimation of cetaceans in riverine systems is difficult due to the limited cruise course restricted by shallow water and ship lanes. In the present study, we conducted a zigzag survey trial with towed acoustic system in the main stem of the Yang...
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ژورنال
عنوان ژورنال: Nature
سال: 1997
ISSN: 0028-0836,1476-4687
DOI: 10.1038/41451