killer whale predation on sea otters

An otter is “no more than a mouthful” for a killer whale, Bowlby says. Killer Whale Predation on Sea Otters Linking Oceanic and . Increased killer whale predation is the likely cause of these declines. weight sea lion taken (kg) 160 300 160 160 % Sea lion in killer whale diet 0.20 0.05 0.125 0.125 No. Sea lions and seals are now not as abundant as they once were, especially in the North Pacific, forcing the whales to turn to sea otters … Elevated sea urchin density and the consequent … Researchers have also demonstrated how killer whale predation on sea otters link oceanic and near shore ecosystems. Sea otters are the primary natural predators of sea urchins. ... – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - … Their favorite prey has always been sea lions and seals. In the Aleutian Islands, a decline in sea otter populations in the 1990s was controversially attributed by some scientists to killer whale predation, although with no direct evidence. After nearly a century of recovery from overhunting, sea otter populations are in abrupt decline over large areas of western Alaska. Another threat to the Alaskan sea otter is the killer whale. Killer Whale Predation on Sea Otters Linking Oceanic and Nearshore Ecosystems in the journal Science (1998) points to increased killer whale predation as the reason for the sharp decline in sea otter populations. The killer whale predation hypothesis is based on three lines of evidence: (i) there was an increase in the number of observed killer whale attacks on sea otters during the 1990s, coincident with a decline in sea otters, (ii) sea otter … Killer Whale Predation on Sea Otters Linking Oceanic and Nearshore Ecosystems J. I don't know about you but lately I have been seeing lots of stories about Animals being more intelligent than we give them credit for. The report “Killer whale predation on sea otters: Linking oceanic and nearshore systems” by James A. Estes et al. (1998) hypothesized that killer whale predation is responsible. This was an unusual idea, since killer whales and sea otters had been observed together in Alaska for decades with no obvious interactions occurring between them. Elevated sea urchin density and the consequent deforestation of kelp beds in the nearshore community demonstrate that the otter's … John Dornellas, 37, filmed sea otter frantically swim towards his boat for safety Killer Whales. But hungry killer whales aren’t finding enough of their preferred prey: seals and sea lions. A report by J. Estes et al. (1998) show that after nearly a century of recovery from overhunting, sea otter populations are in rapid decline over large areas of western Alaska. This crash began in the early 1990s, in the same year as one of the first confirmed sightings of a killer whale attacking a sea otter. Let's get otter here! 5. Killer whales live on, at the expense of otters Researchers say the ocean's top predators have been forced to change their diet as a direct result of human-induced ecological change. After nearly a century of recovery from overhunting, sea otter populations are in abrupt decline over large areas of western Alaska. Describe two experiments that would allow you to test the hypothesis that increased predation by killer whales was the cause of the sea otter decline. (Riedman and Estes 1990, Larson 2015) The Most widely accepted hypothesis is that increased predation by killer whales had caused the decline of the sea otters in the Aleutian archipelago. 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