نتایج جستجو برای: dolphin structure
تعداد نتایج: 1570259 فیلتر نتایج به سال:
Recent recordings of dolphin echolocation using a dense array of hydrophones suggest that the echolocation beam is dynamic and can at times consist of a single dominant peak, while at other times it consists of forward projected primary and secondary peaks with similar energy, partially overlapping in space and frequency bandwidth. The spatial separation of the peaks provides an area in front o...
Commerson's dolphins (Cephalorhynchus c. commersonii) and Peale's dolphins (Lagenorhynchus australis) are two of the most common species of cetaceans in the coastal waters of southwest South Atlantic Ocean. Both species are listed as Data Deficient by the IUCN, mainly due to the lack of information about population sizes and trends. The goal of this study was to build spatially explicit models ...
Bird flocks associated with dolphins in the eastern tropical Pacific are described from observations obtained during eight cruises that took place from January to March of 1976, 1977, 1979, and 1980. In the northern tropical waters between latitudes 5”N and 30”N, 43% to 53% of bird flocks co-occurred with dolphins. In equatorial and southern subtropical waters between latitudes 5”N to 12”s and ...
We give a detailed history of the exploitation of marine mammals in Barbados, which focused almost exclusively on humpback whales (Megaptera novaeangliae). We have reconstructed this history to better understand the impacts of human activities on the marine environment. Based on historical data, we demonstrate that whaling was a marginal activity financed by local elites who found it easy to tr...
The imitative ability of nonhuman animals has intrigued a number of scholars and, in doing so, has generated a considerable amount of controversy. Although it is clear that many species can learn via observational learning, there is a lack of consensus concerning both what sorts of things can be learned by watching others and what types of observational learning should count as imitation. These...
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During 2011-2013, dolphin morbillivirus was molecularly identified in 4 stranded fin whales from the Mediterranean Sea. Nucleoprotein, phosphoprotein, and hemagglutinin gene sequences of the identified strain were highly homologous with those of a morbillivirus that caused a 2006-2007 epidemic in the Mediterranean. Dolphin morbillivirus represents a serious threat for fin whales.
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