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Marine Birds - Marine Biology - Lecture Slides, Slides of Biology

Amity University - BiharBiology

These are the lecture slides of Marine Biology. Key important points are: Marine Birds, Subphylum Vertebrata, Class Aves, Homeothermic and Endothermic, Penguins and Tubenoses, Pelagic Realm, Denser Bones, Fatty Insulation, Tube-Like Nostrils, Albatross

Typology: Slides

2012/2013

Uploaded on 01/25/2013

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akshita 🇮🇳

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Marine Birds
(Subphylum Vertebrata; Class Aves)
•Birds evolved from reptiles (dinosaurs)
approximately 150-200 million years ago
during the Jurassic period
•Modern birds are characterized by feathers,
the laying of hard shelled eggs, and a
lightweight, but strong skeleton
•Birds are warm-blooded
–Homeothermic and endothermic!
–Scaly legs and claws
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Marine Birds

(Subphylum Vertebrata; Class Aves)

  • Birds evolved from reptiles (dinosaurs) approximately 150-200 million years ago during the Jurassic period
  • Modern birds are characterized by feathers, the laying of hard shelled eggs, and a lightweight, but strong skeleton
  • Birds are warm-blooded
    • Homeothermic and endothermic!
    • Scaly legs and claws
  • Birds have light, hollow bones for efficient flight
  • Marine birds, or seabirds, are birds that spend a significant part of their lives at sea and feed on marine organisms
  • Most breed in large colonies on land
  • True seabirds have webbed feet for swimming

Marine Birds

Marine Birds

  • Of all the seabirds, penguins and tubenoses are the best adapted to the pelagic realm

Penguins

  • Penguins have completely lost the ability to fly and have modified their wings into flippers
  • Fatty insulation keeps penguins warm while denser bones allows them to maintain neutral buoyancy in the water
  • Streamlined bodies; can alternately swim and jump out of the water to reduce drag and increase swimming efficiency

Penguins

  • Dense, waterproof feathers trap air that, warmed by their body heat, protects against the cold
  • The larger penguins (such as Emperor and King) hunt for squid and fish
  • Small penguins (such as Adélie) feed primarily on krill

Tubenoses

  • The tubenoses comprise a large group of seabirds with distinctive tube-like nostrils and heavy beaks that are usually curved at the tip
  • Includes albatross, petrels, and shearwaters
  • Spend months and often years at sea
  • Salt glands empty into the nostrils to get rid of excess salts

Tubenoses

  • Tubenoses are very skillful fliers
  • Albatross have the largest wingspan of any bird (up to 11 feet from tip to tip)