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Marine Birds

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Marine Birds Physical Adaptations for the sea: Wing Shape Long/slim = pelagic, months of flying Short wings = diving Feathers Water-repellent feathers More than land ... – PowerPoint PPT presentation

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Title: Marine Birds


1
Marine Birds
2
Physical Adaptations for the sea
  • Wing Shape
  • Long/slim pelagic, months of flying
  • Short wings diving
  • Feathers
  • Water-repellent feathers
  • More than land birds
  • Webbed feet for swimming after prey
  • Thick skull bones and air sacs around necks for
    head first dives
  • Salt glands

3
Behavioral Adaptations
  • Breed later
  • Fewer young invest a lot of time into offspring
  • Nest in colonies
  • Long migrations

4
Most Common Marine Birds in Hawaii
  • Albatrosses
  • 2. Shearwaters and Petrels
  • Frigatebirds
  • Boobies
  • Terns and Noddies

5
Albatross
  • See well at night, feed on squid
  • Distinct courtship
  • Once together, together for life separate at
    sea, but return each year
  • 2 main types Layson and black-footed
  • Largest seabirds in North Pacific
  • Leave in June/July return in October

6
Shearwater and Petrels
  • Long pointed wings
  • Slender bodies
  • See well at night
  • Remain paired for life
  • Dig burrows
  • Awkward on land, legs so far back they cannot
    walk
  • Migrate to C. America to feed

7
Frigatebirds
  • Large, black, slim wings, with forked tail
  • Males have red pouches for mating rituals
  • Feed during the day
  • Great frigatebirds most common in HI
  • Efficient in the air, known to pursue other
    seabirds and rob their food

8
Boobies
9
  • Designed for plunge diving (30 ft above)
  • Well adapted for terrestrial and marine life
  • Nest any month of the year
  • Incubate by wrapping their feet around the egg
    (balls, fish floats)
  • Common types Brown, Red footed, Masked

10
Terns and Noddies
  • Slender, graceful with long pointed wings and
    straight tapered bills
  • Swim poorly, feet are too small
  • Live aloft, sleeping during flight
  • Ceremonial fish flights

11
Why are they important?
  • IMPORTANT CONSUMER
  • over 400,000 tons of fish, squid, crustaceans
    each year!
  • Indicators for fish schools and land
  • Bird feces (guano) fertilizer

12
Threats to Marine Birds
  • Bycatch
  • 100,000 albatross hooked on long-line fishing a
    year
  • Overfishing
  • Hunting of birds and eggs
  • Introduced species
  • Kill nesting birds, destroy habitat
  • Biomagnification of toxins and pollutants

13
Hawaii Marine Bird Videos
  • http//www.youtube.com/watch?vC7cMihMeq3Y
  • http//www.hawaiianatolls.org/video/nowramp020927.
    php
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