Share
VIDEOS 1 TO 50
Gigantothermy
Gigantothermy
Published: 2016/08/31
Channel: WikiWikiup
Gigantothermy
Gigantothermy
Published: 2015/03/21
Channel: J.P. Anderson - Topic
How to Pronounce Gigantothermy
How to Pronounce Gigantothermy
Published: 2015/03/07
Channel: Pronunciation Guide
Episode 1: SUE
Episode 1: SUE's really big butt
Published: 2016/02/25
Channel: discoverycentre1215
Poikilothermy & How it is achieved ? Cold Blooded or Warm Blooded
Poikilothermy & How it is achieved ? Cold Blooded or Warm Blooded
Published: 2017/06/17
Channel: Hussain Biology
Gibson Atherton
Gibson Atherton
Published: 2016/08/31
Channel: WikiWikiup
Baby Galápagos tortoises, Darwin Research Station, Santa Cruz Island, Galápagos Islands, Ecuador
Baby Galápagos tortoises, Darwin Research Station, Santa Cruz Island, Galápagos Islands, Ecuador
Published: 2013/05/29
Channel: Pietro Pecco
Pacific Leatherback Sea Turtles
Pacific Leatherback Sea Turtles
Published: 2014/07/14
Channel: Thankyouocean
How to Pronounce Afrosoricida
How to Pronounce Afrosoricida
Published: 2013/10/10
Channel: Emma Saying
Baby Galápagos tortoises, Darwin Research Station, Santa Cruz Island, Galápagos Islands, Ecuador
Baby Galápagos tortoises, Darwin Research Station, Santa Cruz Island, Galápagos Islands, Ecuador
Published: 2013/05/29
Channel: Pietro Pecco
Gaans Bay, South Africa
Gaans Bay, South Africa
Published: 2015/03/21
Channel: J.P. Anderson - Topic
Ferocius Man Eater?
Ferocius Man Eater?
Published: 2015/03/21
Channel: J.P. Anderson - Topic
How to Pronounce Paucituberculata
How to Pronounce Paucituberculata
Published: 2014/06/01
Channel: Emma Saying
Galápagos tortoises, Charles Darwin Research Station, Santa Cruz Island, Galápagos Islands, Ecuador
Galápagos tortoises, Charles Darwin Research Station, Santa Cruz Island, Galápagos Islands, Ecuador
Published: 2013/05/29
Channel: Pietro Pecco
Giant current ripples
Giant current ripples
Published: 2016/08/31
Channel: WikiWikiup
Galápagos tortoise, Charles Darwin Research Station, Santa Cruz Island, Galápagos Islands, Ecuador
Galápagos tortoise, Charles Darwin Research Station, Santa Cruz Island, Galápagos Islands, Ecuador
Published: 2013/05/29
Channel: Pietro Pecco
Galápagos tortoises, Charles Darwin Research Station, Santa Cruz Island, Galápagos Islands, Ecuador
Galápagos tortoises, Charles Darwin Research Station, Santa Cruz Island, Galápagos Islands, Ecuador
Published: 2013/05/29
Channel: Pietro Pecco
Tortuga laud | El visitante de todos los mares| (Animales del Mundo) |Mes playero|
Tortuga laud | El visitante de todos los mares| (Animales del Mundo) |Mes playero|
Published: 2016/07/22
Channel: Cityanimal
Galápagos tortoise, Charles Darwin Research Station, Santa Cruz Island, Galápagos Islands, Ecuador
Galápagos tortoise, Charles Darwin Research Station, Santa Cruz Island, Galápagos Islands, Ecuador
Published: 2013/05/29
Channel: Pietro Pecco
How to Pronounce afrotherian
How to Pronounce afrotherian
Published: 2015/02/26
Channel: Pronunciation Guide
Dyer Island
Dyer Island
Published: 2015/03/21
Channel: J.P. Anderson - Topic
Sea Turtles of the San Francisco Bay Area - Golden Gate Brown Bag Lunch Presentation
Sea Turtles of the San Francisco Bay Area - Golden Gate Brown Bag Lunch Presentation
Published: 2012/03/29
Channel: SFNPS Science and Learning
How to Pronounce Haematachometers
How to Pronounce Haematachometers
Published: 2015/03/07
Channel: Pronunciation Guide
How to Pronounce Heathenesses
How to Pronounce Heathenesses
Published: 2015/03/07
Channel: Pronunciation Guide
How to Pronounce Handsomes
How to Pronounce Handsomes
Published: 2015/03/07
Channel: Pronunciation Guide
How to pronounce Dasyuridae
How to pronounce Dasyuridae
Published: 2017/01/18
Channel: How to pronounce
NEXT
GO TO RESULTS [27 .. 76]

WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
Jump to: navigation, search

Gigantothermy (sometimes called ectothermic homeothermy or inertial homeothermy) is a phenomenon with significance in biology and paleontology, whereby large, bulky ectothermic animals are more easily able to maintain a constant, relatively high body temperature than smaller animals by virtue of their smaller surface area to volume ratio.[1] A bigger animal has proportionately less of its body close to the outside environment than a smaller animal of otherwise similar shape, and so it gains heat from, or loses heat to, the environment much more slowly.[2]

The phenomenon is important in the biology of ectothermic megafauna, such as large turtles, and aquatic reptiles like ichthyosaurs and mosasaurs.[citation needed] Gigantotherms, though almost always ectothermic, generally have a body temperature similar to that of endotherms.[citation needed] It has been suggested that the larger dinosaurs would have been gigantothermic, rendering them virtually homeothermic.[3]

Negative effects[edit]

Gigantothermy allows animals to maintain body temperature, but is most likely detrimental to endurance and muscle power as compared with endotherms due to decreased anaerobic efficiency.[4] Mammals' bodies have roughly four times as much surface area occupied by mitochondria as reptiles, necessitating larger energy demands, and consequently producing more heat to use in thermoregulation. An ectotherm the same size of an endotherm would not be able to remain as active as the endotherm, as heat is modulated behaviorally rather than biochemically. More time is dedicated to basking than eating.

Positive effects[edit]

Large ectotherms displaying the same body size as large endotherms have the advantage of a slow metabolic rate, meaning it takes reptiles longer to digest their food. Subsequently gigantothermic ectotherms would not have to eat as often as large endotherms that need to maintain a constant influx of food to meet energy demands. Although lions are much smaller than crocodiles, the lions must eat more often than crocodiles because of their higher metabolic output necessary to maintain the lion's heat and energy. The crocodile must only lay in the sun to digest more quickly and create ATP.

See also[edit]

References[edit]

External links[edit]

Disclaimer

None of the audio/visual content is hosted on this site. All media is embedded from other sites such as GoogleVideo, Wikipedia, YouTube etc. Therefore, this site has no control over the copyright issues of the streaming media.

All issues concerning copyright violations should be aimed at the sites hosting the material. This site does not host any of the streaming media and the owner has not uploaded any of the material to the video hosting servers. Anyone can find the same content on Google Video or YouTube by themselves.

The owner of this site cannot know which documentaries are in public domain, which has been uploaded to e.g. YouTube by the owner and which has been uploaded without permission. The copyright owner must contact the source if he wants his material off the Internet completely.

Powered by YouTube
Wikipedia content is licensed under the GFDL and (CC) license