Killer controversy why orcas should no longer be kept in captivity introduction since 1964, when a killer whale or orca (orcinus orca) was first put on found in nature these seaworld statements and graphics leave the impression that collapsed fins are common when in fact erect fins – to heights of. The genetic variation within and between putative killer whale (orcinus orca) populations was examined by dna fingerprinting nuclear genomes and sequencing the d-loop region of the mitochondrial genome mitochondrial dna an introduction to population genetics theory harper & row, new york. Introduction to orcas throughout history, orcas have been inadequately considered and the lack of knowledge about them, as well as the myths that have circulated for generations, have caused them to be cataloged as sea monsters, enemies of all aquatic species and mainly, “killer” whales this belief comes from long. Introduction despite its confusing name, the killer whale is actually the largest member of the dolphin family the killer whale/orca (orcinus orca) is well known and can be identified relatively easily by its distinctive black and white markings and very tall, prominent dorsal fin they can grow up to 9 m in length, with male.
The international union for conservation of nature assesses the orca's conservation status as data deficient because of the likelihood that two or more killer whale types are separate species some local populations are considered threatened or endangered due to prey depletion, habitat loss, pollution (by pcbs) , capture. Introduction two main ecotypes of killer whales cruise the coastal waters of southeast alaska one type, called residents, feeds exclusively on fish, while the other, called transients, feeds exclusively on marine mammals a third ecotype, the offshores, is seen infrequently and feed on sharks although their ranges overlap,.
Orcas, also known as killer whales, are are the largest member of the dolphin family threats to orcas include hunting and captivity. Introductionintroduction conspecific infanticide occurs within many taxa among terrestrial mammals, it is mostly reported in primates, carnivores and rodents however, compelling evidence for infanticide in cetaceans exists in three species of dolphin patterson et al and dunn et al found that.
Notes and images of killer whales, updated from the canadian museum of nature's natural history notebooks series. Nature's killers in eden examines a remarkable and mysterious partnership between killer whales and whalers on the southeast coast of australia, the town of eden nestles along the shores of twofold bay it was once a center of australia's thriving whaling industry, in part because it lies along the.
Introduction as top marine predators, killer whales (orcinus orca) are known to consume a wide range of food items, from small fishes to the largest whales (ford 2002) although generally considered to be monotypic, in some areas such as the northeast pacific, up to three sympatric ecotypes of killer whale are recognized,.
The transnational nature of the region's killer whale pods helped spur not only ecological reflection but also transborder cooperation among activists, scientists  from the 1840s to the 1870s, english and american whaling ships hunted these species to commercial extinction in northwest waters, and the introduction of. Doug gardner visits the san juan islands to photograph southern resident killer whales and discuss some expert tips for wildlife photography. Killer whales don't vote or drink bc wine or attend town halls but, like us, they depend on our government to protect their environment under the species at risk act, the federal government has the power to help protect endangered southern residents.