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Evolution of river dolphins
- H. Hamilton, S. Caballero, A. Collins, R. Brownell
- Environmental Science, BiologyProceedings of the Royal Society of London…
- 7 March 2001
It is suggested that ancestors of the four extant river dolphin lineages colonized the shallow epicontinental seas that inundated the Amazon, Paraná, Yangtze and Indo–Gangetic river basins, subsequently remaining in these extensive waterways during their transition to freshwater with the Late Neogene trend of sea–level lowering.
Retroposon analysis of major cetacean lineages: The monophyly of toothed whales and the paraphyly of river dolphins
The combination of SINE and flanking sequence analysis suggests a topology and set of divergence times for odontocete relationships, offering alternative explanations for several long-standing problems in cetacean evolution.
Baleen Whales: Conservation Issues and The Status Of The Most Endangered Populations
Current data suggest that, of the various threats potentially affecting baleen whales, only entanglement in fishing gear and ship strikes may be significant at the population level, and then only in those populations which are already at critically low abundance.
Past and present distribution, densities and movements of blue whales Balaenoptera musculus in the Southern Hemisphere and northern Indian Ocean
Blue whales avoid the oligotrophic central gyres of the Indian, Pacific and Atlantic Oceans, but are more common where phytoplankton densities are high, and where there are dynamic oceanographic processes like upwelling and frontal meandering.
Soviet catches of southern right whales Eubalaena australis, 1951–1971. Biological data and conservation implications
Status of the world's baleen whales
Small isolated subspecies or subpopulations, such as northern Indian Ocean blue whales, Arabian Sea humpback whales, and Mediterranean Sea fin whales are threatened while most sub Populations of sei, Bryde’s, and Omura's whales are inadequately monitored and difficult to assess.
Conservation status of North Pacific right whales
A corona cartridge for charging a photoreceptor in high-speed electrophotographic applications may include a comb-like corona charging device electronically connected to operate with the…
THE PHYLOGENETIC RELATIONSHIPS AND BIOGEOGRAPHY OF TRUE PORPOISES (MAMMALIA: PHOCOENIDAE) BASED ON MORPHOLOGICAL DATA
This study evaluates a comprehensive set of cranial, postcranial, and soft anatomical characters to infer interrelationships among extant species and several well-known fossil phocoenids, using two different methods to analyze polymorphic data: polymorphic coding and frequency step matrix.
U.S. Pacific Marine Mammal Stock Assessments