3_ForagingEcology_April_8_2008

3_ForagingEcology_April_8_2008 - 4/8/2008 Foraging Behavior...

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4/8/2008 1 Foraging Ecology of Marine Mammals Foraging Behavior • Animals go where the food is • Prey concentrating mechanisms • Fronts • Convergent/Divergent Zones ddies Eddies • Bathymetry Marine Mammals as Prey • All marine mammals have natural predators • Predation risk varies- • between families/species • by age Sirenians Manatees • Very low risk, few predators • Killer whales, large sharks, crocodiles Dugongs •H igher risk g • Killer whales, large sharks, crocodiles • Tiger sharks: 20-35% had dugong in
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4/8/2008 2 Otters Terrestrial predators ow risk, not often on land Low risk, not often on land • Coyotes, brown bears, foxes Marine predators • High risk, although not preferred prey • Killer whales, sharks, birds • Bald eagles take young off water Pinnipeds Terrestrial predators • Polar bears – seals (primarily ringed), (p y g ), walrus • Jackals, wolves, mountain lions, coyotes Pinnipeds Marine predators ther pinnipeds • Other pinnipeds - Leopard seals eat phocids, fur seals - Walrus occasionally eat other seals; impale with tusks arge sea lions & fur seals occasionally - Large sea lions & fur seals occasionally eat smaller otariids Foraging Behavior of Crabeater Seals During the Antarctic Winter
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4/8/2008 3 Pinnipeds Marine predators etaceans Cetaceans - Killer whales: only MM eating individuals • Sharks hite sharks Tiger sharks - White sharks, Tiger sharks, Seven gill sharks Killer whale predation on pinnipeds ttp://www youtube com/watch?v=VyfOp keW0A
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This note was uploaded on 04/15/2008 for the course BIO 139 taught by Professor Costa during the Spring '08 term at UCSC.

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3_ForagingEcology_April_8_2008 - 4/8/2008 Foraging Behavior...

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