HC BIOL 103 - Sea Bird Behavior (4 pages)

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Sea Bird Behavior



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Sea Bird Behavior

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Pages:
4
School:
Highline College
Course:
Biol 103 - Seabirds and Marine Mammals

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Seabird Behavior Feeding o Some adaptations revisited Shorebirds Beak type and length corresponds to food preference o Methods Seabirds are adapted to the density and distribution of prey as well as the capture and handling of that prey Surface feeding while flying sometimes with pursuit plunging o Used by small and aerially agile seabirds Petrels Storm Petrels Frigatebirds and Terns o Storm Petrels Flit back and forth lowering the feet and pattering the surface of the water and dipping the head down to feed on zooplankton and small fish o Frigatebirds Skim the surface at full speeds and a downbent head plucking food from the surface layer a method facilitated by their long neck and long sharply hooked bill o Terns Pick off fish or squid that are running away from larger predators either by pattering plunging or catching flying fish in the air Surface feeding while swimming sometimes with pursuit diving o Feed by sitting on the surface or forcing themselves slightly below Albatrosses and Shearwaters o Albatrosses Feed mainly on fish squid cuttlefish crustaceans and offal but also eat jellyfish Usually feed at night by dipping their heads into the water though they sometimes plunge dive They feed at night because many fish and zooplankton surface at night Nomadism allows these birds to take advantage of rich but widely separated food sources o Shearwaters Feed while swimming at the surface but they all dive in order to catch prey Mostly feed in the dim light Plunge diving could be truly deep divers or merely surface o Deep plunge divers Tropicbirds Gannets and Boobies Gannets Heavy birds they may begin dive with either wing beats or just falling Wings held at an angle during the plunge Go at most 10 meters deep and last for less than 10 seconds Air sacs cushion against the impact and occluded nostrils prevent water up the nose o Shallow plunge divers Brown pelican The plunge looks very awkward but is expertly controlled with neck bent back over the shoulders Pouch



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