Animalia-Adaptation to Land, Dinosaurs and Birds

Animalia-Adaptation to Land, Dinosaurs and Birds -...

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Dinosaurs A group of their own. One of the most successful large animal group. Primary carnivores and herbivores for 160 million years. Lived in large herds or solitary Developed many large sized species Probably endothermic
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Dinosaur/bird Connection Archaeopteryx 1. Many 2-legged walkers 2. Bird-like ankle joint 3. Massive expansion of the hip bone – moved forward along body axis 4. Hind foot arranged like birds with one rearward directed phalange 5. Holes in the vertebral column for continuation of air-sacs
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Dinosaur/bird Connection cont 6. Pubic bone facing posterior in mammals forward 1. Brooding behavior appear similar 2. Some dinosaurs have feather like structures
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Were Dinosaurs warm-blooded? Endothermic characteristics 1. Higher metabolic rates 2. Greater blood supply to long bones Haversian Canals Poikilothermic retiles have few H.C. and Endotherms have more and larger Dinosaurs have patterns similar to mammals
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Were Dinosaurs warm-blooded? Predator/prey ratios African mammals 1.0% Modern reptiles 25% Therapsids 10% Eocene mammals 5.0% Dinosaurs 3.5%
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Were Dinosaurs warm-blooded? Evidence of 16 O & 18 O in bone changes according to temperature Increase in 18 O when temperature is lower In cows no difference in 18 O: 16 O in ribs and leg bones In komodo dragon – tail reveals a higher ratio than in the ribs indicating a range of 2-9 o C colder tail In T. rex – temperature range only 4 o C
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Other dinosaur characteristics Social behavior Hypsilophodonts Bred in colonies
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This note was uploaded on 12/09/2009 for the course BIO 200 taught by Professor Herreid during the Spring '07 term at SUNY Buffalo.

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Animalia-Adaptation to Land, Dinosaurs and Birds -...

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