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Warm-Blooded vs. Cold-Blooded: What’s The Difference?
Warm-Blooded vs. Cold-Blooded: What’s The Difference?
Published: 2015/05/12
Channel: Seeker
Rob & Jonny Show Episode 2: Endotherms & Ectotherms
Rob & Jonny Show Episode 2: Endotherms & Ectotherms
Published: 2012/09/03
Channel: Brevard Zoo
Rune Bagge in TweakFM (Ectotherm)
Rune Bagge in TweakFM (Ectotherm)
Published: 2016/09/18
Channel: tweakitbaby
Thermoregulation: Endotherms and Ectotherms
Thermoregulation: Endotherms and Ectotherms
Published: 2015/04/21
Channel: Kinsey Biggs
Mama Snake in TweakFM (Ectotherm, Apeiron Crew)
Mama Snake in TweakFM (Ectotherm, Apeiron Crew)
Published: 2016/05/25
Channel: tweakitbaby
√ Physiological and Structural adaptations of ectotherms and endotherms | iitutor
√ Physiological and Structural adaptations of ectotherms and endotherms | iitutor
Published: 2015/12/28
Channel: iitutor.com
DJ Seinfeld - Flyin
DJ Seinfeld - Flyin' Thru Sunrise (ENDOS001)
Published: 2017/01/26
Channel: Ectotherm Recordings
Ectotherms & Endotherms [HSC Biology[
Ectotherms & Endotherms [HSC Biology[
Published: 2016/06/08
Channel: HSC Hero
MB.1.10. Endotherms and Ecotherms (HSC biology)
MB.1.10. Endotherms and Ecotherms (HSC biology)
Published: 2012/01/10
Channel: Letslearnscience
Biology Organisms & Population part 14 (Homeotherms, Poikilotherms, Ectotherms) class 12 XII
Biology Organisms & Population part 14 (Homeotherms, Poikilotherms, Ectotherms) class 12 XII
Published: 2016/02/29
Channel: ExamFear Education
Thermoregulation
Thermoregulation
Published: 2012/03/17
Channel: Bozeman Science
IBON - No Cry [Ectotherm]
IBON - No Cry [Ectotherm]
Published: 2017/03/26
Channel: Machine Funk Savantage
IBON - Maur [Ectotherm]
IBON - Maur [Ectotherm]
Published: 2017/03/26
Channel: Machine Funk Savantage
Endothermic & Ectothermic Animals
Endothermic & Ectothermic Animals
Published: 2017/03/07
Channel: Kristin Mixson
IBON - Svever [Ectotherm]
IBON - Svever [Ectotherm]
Published: 2017/03/26
Channel: Machine Funk Savantage
ANIMAL FACT: What is an Ectotherm? | Minecraft-The Pack
ANIMAL FACT: What is an Ectotherm? | Minecraft-The Pack
Published: 2014/02/08
Channel: Jesse Callaghan
Ectotherms to Endotherms Development of the 4 Chambered Heart
Ectotherms to Endotherms Development of the 4 Chambered Heart
Published: 2013/03/14
Channel: Dave Hardt
Rune Bagge - Secret Solutions
Rune Bagge - Secret Solutions
Published: 2016/11/15
Channel: 7296272962
How do cold blooded animals stay warm?
How do cold blooded animals stay warm?
Published: 2015/02/07
Channel: World of Warmth
Endotherm vs Ectotherm: Of Mice and Frogs + Scientific Research Paper
Endotherm vs Ectotherm: Of Mice and Frogs + Scientific Research Paper
Published: 2015/07/15
Channel: Garrett Weeks
ENDOTHERMIC/ECTOTHERMIC ANIMALS
ENDOTHERMIC/ECTOTHERMIC ANIMALS
Published: 2015/03/08
Channel: Mary Massey
Thermoregulation: Endotherms and Ectotherms | A-level Biology | OCR, AQA, Edexcel
Thermoregulation: Endotherms and Ectotherms | A-level Biology | OCR, AQA, Edexcel
Published: 2016/08/31
Channel: SnapRevise
Ectotherm vs. Endotherm
Ectotherm vs. Endotherm
Published: 2008/11/03
Channel: m0nst3rfr0mth3p1t
Texas Wild: Ectotherms Montage
Texas Wild: Ectotherms Montage
Published: 2012/05/24
Channel: Texas Wild
Endotherms and Ectotherms - A Level Biology
Endotherms and Ectotherms - A Level Biology
Published: 2012/11/23
Channel: ocrbiologya2
Schacke - Nightclub Warrior (ECTOS001)
Schacke - Nightclub Warrior (ECTOS001)
Published: 2017/01/26
Channel: Ectotherm Recordings
Schacke - Nightclub Warrior [Ectotherm]
Schacke - Nightclub Warrior [Ectotherm]
Published: 2016/05/17
Channel: Moskalus
Ectothermic
Ectothermic
Published: 2015/09/04
Channel: Tanner Wiley
Endotherms and Ectotherms
Endotherms and Ectotherms
Published: 2016/03/27
Channel: Revisify
The Difference of Metabolic Responses between Ectotherm and Endotherm at Variant Ambient Temperature
The Difference of Metabolic Responses between Ectotherm and Endotherm at Variant Ambient Temperature
Published: 2017/06/18
Channel: Fatihah Zaidi
Extraordinary Ectotherms Part 1.
Extraordinary Ectotherms Part 1.
Published: 2008/03/15
Channel: Will Bird
Zoo Tales - Excellent ectotherms at Auckland Zoo
Zoo Tales - Excellent ectotherms at Auckland Zoo
Published: 2016/02/11
Channel: Auckland Zoo
Physiology 2012: How cool are ectotherm hearts?: Holly Shiels
Physiology 2012: How cool are ectotherm hearts?: Holly Shiels
Published: 2012/09/21
Channel: The Physiological Society
Ectotherm Meaning
Ectotherm Meaning
Published: 2015/04/26
Channel: ADictionary
Ectotherms
Ectotherms
Published: 2016/09/06
Channel: RICARDO DUTRA
Rune Bagge - Secret Solutions (ECTOS002)
Rune Bagge - Secret Solutions (ECTOS002)
Published: 2017/01/26
Channel: Ectotherm Recordings
Captive Ectotherm Slideshow
Captive Ectotherm Slideshow
Published: 2011/04/10
Channel: CobraKeeper93
How to Graph: Endotherm vs Ectotherm Report
How to Graph: Endotherm vs Ectotherm Report
Published: 2015/06/04
Channel: Garrett Weeks
Ectotherm Respiration under Temperature Variation
Ectotherm Respiration under Temperature Variation
Published: 2012/10/24
Channel: TheStudyingScientist
Ectothermic Experiment
Ectothermic Experiment
Published: 2008/08/30
Channel: pro3128
ENDO vs ECTOTHERMS
ENDO vs ECTOTHERMS
Published: 2015/11/19
Channel: Jenny Roberts
Ectothermic Meaning
Ectothermic Meaning
Published: 2015/04/26
Channel: ADictionary
Video #3:endothermic reaction vs ectothermic reaction
Video #3:endothermic reaction vs ectothermic reaction
Published: 2016/02/29
Channel: Cheybear0325
How to Pronounce Ectotherm
How to Pronounce Ectotherm
Published: 2013/05/03
Channel: Emma Saying
How to Pronounce Ectotherm
How to Pronounce Ectotherm
Published: 2015/03/03
Channel: Pronunciation Guide
KATARRHAKTES - Ectotherm
KATARRHAKTES - Ectotherm
Published: 2010/02/03
Channel: katarrhaktes
Spiders, Snakes, Insects, and Other Ectotherms in the Winter
Spiders, Snakes, Insects, and Other Ectotherms in the Winter
Published: 2014/02/18
Channel: LittleSolarSystem
ectotherms
ectotherms
Published: 2016/05/22
Channel: mat matington
VSVS - Endothermic and Ectothermic Reactions
VSVS - Endothermic and Ectothermic Reactions
Published: 2016/09/27
Channel: VSVS VSVS
Ectotherms Part 2.
Ectotherms Part 2.
Published: 2008/03/15
Channel: Will Bird
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WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
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Pseudemys turtles (shown here basking for warmth) are ectothermic.
The red line represents the air temperature. The purple line represents the body temperature of the lizard. The green line represents the base temperature of the burrow. Lizards are ectotherms and use behavioral adaptations to control their temperature. They regulate their behavior based on the temperature outside, if it is warm they will go outside up to a point and return to their burrow as necessary.
Junonia lemonias is basking under the sun.

An ectotherm (from the Greek ἐκτός (ektós) "outside" and θερμός (thermós) "hot"), is an organism in which internal physiological sources of heat are of relatively small or quite negligible importance in controlling body temperature.[1] Such organisms (for example frogs) rely on environmental heat sources,[2] which permit them to operate at very economical metabolic rates.[3] Colloquially, some refer to these organisms as "cold blooded" though such a term is not technically correct, as the blood temperature of the organism varies with ambient environmental temperature. Some of these animals live in environments where temperatures are practically constant, as is typical of regions of the abyssal ocean. In contrast, in places where temperature varies so widely as to limit the physiological activities of other kinds of ectotherms, many species habitually seek out external sources of heat or shelter from heat; for example, many reptiles regulate their body temperature by basking in the sun, or seeking shade when necessary in addition to a whole host of other behavioral thermoregulation mechanisms. In contrast to ectotherms, endotherms rely largely, even predominantly, on heat from internal metabolic processes.

In ectotherms, fluctuating ambient temperatures may affect the body temperature. Such variation in body temperature is called poikilothermy, though the concept is not widely satisfactory and the use of the term is declining. In small aquatic creatures such as Rotifera, the poikilothermy is practically absolute, but other creatures (like crabs) have wider physiological options at their disposal, and they can move to preferred temperatures, avoid ambient temperature changes, or moderate their effects.[1][4] Ectotherms can also display the features of homeothermy, especially within aquatic organisms. Normally their range of ambient environmental temperatures are relatively constant, and there are few in number that attempt to maintain a higher internal temperature due to the high associated costs.[5]

Adaptations[edit]

Various patterns of behavior enable certain ectotherms to regulate body temperature to a useful extent. To warm up, reptiles and many insects find sunny places and adopt positions that maximise their exposure; at harmfully high temperatures they seek shade or cooler water. In cold weather, honey bees huddle together to retain heat. Butterflies and moths may orient their wings to maximize exposure to solar radiation in order to build up heat before take-off.[1] Gregarious caterpillars, such as the Forest Tent caterpillar, benefit from basking in large groups for thermoregulation.[6] Many flying insects, such as honey bees and bumble bees, also raise their internal temperatures endothermally prior to flight, by vibrating their flight muscles without violent movement of the wings (see insect thermoregulation). Such endothermal activity is an example of the difficulty of consistent application of terms such as poikilothermy and homiothermy.[1]

In addition to behavioral adaptations, physiological adaptations help ectotherms regulate temperature. Diving reptiles conserve heat by heat exchange mechanisms, whereby cold blood from the skin picks up heat from blood moving outward from the body core, re-using and thereby conserving some of the heat that otherwise would have been wasted. The skin of bullfrogs secretes more mucus when it is hot, allowing more cooling by evaporation.[citation needed]

During periods of cold, some ectotherms enter a state of torpor, in which their metabolism slows or, in some cases, such as the wood frog, effectively stops. The torpor might last overnight or last for a season, or even for years, depending on the species and circumstances.

Advantages and disadvantages[edit]

A 1.8m long black snake basking in the Inverness, Florida sunshine on a cool morning.

Ectotherms rely largely on external heat sources such as sunlight to achieve their optimal body temperature for various bodily activities. Accordingly, they depend on ambient conditions to reach operational body temperatures. In contrast, endothermic animals, as a rule, maintain nearly constant high operational body temperatures largely by reliance on internal heat produced by metabolically active organs (liver, kidney, heart, brain, muscle) or even by specialized heat producing organs like brown adipose tissue (BAT). Also, as a rule, ectotherms have lower metabolic rates than endotherms at a given body mass. As a consequence, endotherms generally rely on higher food consumption, and commonly on food of higher energy content. Such requirements may limit the carrying capacity of a given environment for endotherms as compared to its carrying capacity for ectotherms.

Because ectotherms depend on environmental conditions for body temperature regulation, as a rule, they are more sluggish at night and in early mornings. When they emerge from shelter, many diurnal ectotherms need to heat up in the early sunlight before they can begin their daily activities. In cool weather the foraging activity of such species is therefore restricted to the day time in most vertebrate ectotherms, and in cold climates most cannot survive at all. In lizards, for instance, most nocturnal species are geckos specialising in "sit and wait" foraging strategies. Such strategies do not require as much energy as active foraging and do not, as a rule, require hunting activity of the same intensity. From another point of view, sit-and-wait predation may require very long periods of unproductive waiting. Endotherms cannot, in general, afford such long periods without food, but suitably adapted ectotherms can wait without expending much energy. Endothermic vertebrate species are therefore less dependent on the environmental conditions and have developed a higher variability (both within and between species) in their daily patterns of activity.[7]

Contrast between thermodynamics and biological terminology[edit]

Note that because of historical accident, students encounter a source of possible confusion between the terminology of physics and biology. Whereas the thermodynamic terms "exothermic" and "endothermic" respectively refer to processes that give out heat energy and processes that absorb heat energy, in biology the sense is effectively inverted. The metabolic terms "ectotherm" and "endotherm" respectively refer to organisms that rely largely on external heat to achieve a full working temperature, and to organisms that produce heat from within as a major factor in controlling their bodily temperature.

References[edit]

Notes

  1. ^ a b c d Davenport, John. Animal Life at Low Temperature. Publisher: Springer 1991. ISBN 978-0412403507
  2. ^ Jay M. Savage; with photographs by Michael Fogden and Patricia Fogden. (2002). The Amphibians and Reptiles of Costa Rica: a Herpetofauna Between Two Continents, Between Two Seas. Chicago, Ill.: University of Chicago Press. p. 409. ISBN 0-226-73538-9. 
  3. ^ Milton Hildebrand; G. E. Goslow, Jr. Principal ill. Viola Hildebrand. (2001). Analysis of vertebrate structure. New York: Wiley. p. 429. ISBN 0-471-29505-1. 
  4. ^ Lewis, L; Ayers, J (2014). "Temperature Preference and Acclimation in the Jonah Crab, Cancer borealis". Journal of Experimental Marine Biology and Ecology. 455: 7–13. doi:10.1016/j.jembe.2014.02.013. 
  5. ^ Willmer, Pat; Stone, Graham; Johnston, Ian. Environmental Physiology of Animals. Hoboken: Wiley, 2009. Ebook Library. Web. 01 Apr. 2016.
  6. ^ McClure, Melanie; Cannel, Elizabeth; Despland, Emma (June 2011). "Thermal ecology and behaviour of the nomadic social forager Malacosoma disstria". Physiological Entomology. 36 (2): 120–127. doi:10.1111/j.1365-3032.2010.00770.x. 
  7. ^ Hut RA, Kronfeld-Schor N, van der Vinne V, De la Iglesia H (2012). "In search of a temporal niche: environmental factors.". Progress in brain research. 199: 281–304. PMID 22877672. doi:10.1016/B978-0-444-59427-3.00017-4. 

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