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Topic: Poikilotherms

Related Topics

Coldblooded

Thermal regulation

Body temperature

Endothermy

Venom

Exothermic

Animal

Fish

Snake

Invertebrate

Frog

Metamorphosis (biology)

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	Poikilotherms (Site not responding. Last check: 2007-10-13)
		Poikilotherms, or cold-blooded animals, include such diverse groups as mollusks, crustaceans, insects, starfish, worms - in fact, all marine and aquatic invertebrates, as well as fish.
		Poikilotherms comprise >95% of animal biodiversity and their physiology dramatically differs from homeotherms such as birds and mammals.
		Body temperature of poikilotherms directly varies with the ambient temperature.
	www.bioweb.uncc.edu /Faculty/Sokolova/poikilotherms.htm (76 words)

	Poikilothermic
		Poikilothermic organisms, commonly referred to as 'cold-blooded' organisms, are animals that have no internal mechanism for regulating the body temperatures.
		Because their metabolism is so variable, poikilothermic animals do not easily support complex, high-energy organ systems such as brains or wings.
		In general, poikilothermic animals do not use their metabolisms to heat or cool themselves.
	www.ebroadcast.com.au /lookup/encyclopedia/po/Poikilothermic.html (372 words)

	Homeostatic Control Systems (Site not responding. Last check: 2007-10-13)
		The others -- cold-blooded animals or poikilotherms -- differ from homeotherms in lacking the central autonomic thermal controls (the hypothalamus in mammals, and the spinal cord in birds), the continuously high body temperatures, and the emphasis on thermoregulation as a balance between metabolic heat and insulation (in the form of feathers or fur).
		Both homeotherms and poikilotherms have biological stabilisation in the face of changing external temperature by homeostatic feed-back control mechanisms: in homeotherms it is the temperatures of particular parts of the body which are the controlled variables, whereas in poikilotherms the controlled variable might be, for example, metabolic rate [6, Chap.
		For example, adaptive responses in the thermal resistance of tissue in several poikilotherms have been found to be regulated by photoperiod (not by heat), indicating involvement of photoreceptors and the neuroendocrine system even in this compensatory adaptation [1].
	www.cogs.susx.ac.uk /users/adrianth/ecal97/node12.html (1061 words)

	Re: do scientists believe all dinosaurs were cold-blooded?
		Modern reptiles are poikilotherms (meaning they cannot regulate their body temperature by altering their metabolism) and so it had been assumed that all ancient reptiles were poikilotherms as well.
		Poikilotherms CAN regulate their body temperature using behavior, which is why reptiles sun themselves on cool sunny days - they are warming up.
		However, dinosaurs were different from modern reptiles, and similar to modern mammals and birds, in ways that suggested they might have been homeotherms, or animals that use metabolism as well as behavior to regulate body temperature.
	www.madsci.org /posts/archives/2001-02/983395292.Ev.r.html (461 words)

	Inna Sokolova's Home Page
		Understanding of the physiological mechanisms and limitations of stress tolerance is crucial for the understanding of the fate of populations of poikilotherms, which comprise >95% of marine animal biodiversity, in the face of the global environmental change.
		They are common organisms in marine coastal ecosystems, and their physiology and genetics is fairly well known to make them useful model objects; in fact, they are quickly becoming aquatic counterparts of the fruit fly.
		This project is focused on understanding of the effects of environmental temperature (such as expected in case of the global climate change) and heavy metals on bioenergetics of marine poikilotherms.
	www.bioweb.uncc.edu /Faculty/Sokolova (1253 words)

	Margaret Judge (Site not responding. Last check: 2007-10-13)
		The internal body temperature of poikilotherms changes in response to their surrounding temperatures.
		To record respirations rates, a gas sensor probe was used to measure the amount of Carbon Dioxide (CO), which is an output of respiration, in a gas chamber.
		Twenty house crickets (Acheta domestica) were used to represent poikilotherms, and two dwarf hamsters (Phodopus cambelli,) were used to represent homeotherms.
	spot.colorado.edu /~basey/judge.html (470 words)

	Scaling Effects on Metabolism (Site not responding. Last check: 2007-10-13)
		(measured in Watts) of homeotherms, poikilotherms and unicells respectively.
		The proportionality coefficient in homeotherms is 29 times larger than that in poikilotherms, itself 8 times larger than that in unicells.
		What proportion of the energy reserves of a 20 g poikilotherm would be spent in the time it takes a 20 g mouse to turn over its tissues?
	musr.physics.ubc.ca /~jess/sci1/biol/Allometry (348 words)

	Straight Dope Staff Report: What makes some animals cold-blooded and others warm- blooded?
		(At night, when no sunlight is available, they are poikilotherms, their body temperature conforming to the environment.) Conversely, hummingbirds are endotherms that, in order to conserve energy, may go into torpor at night and allow their body temperature to drop.
		They are then poikilothermic endotherms (although during the day they are homeothermic).
		For example, although bees and butterflies are poikilothermic, they can generate quite a bit of heat in their flight muscles.
	www.straightdope.com /mailbag/mwarmblood.html (656 words)

	Food Web Magnification of Persistent Organic Pollutants in Poikilotherms and Homeotherms from the Barents Sea
		The food web investigated comprised zooplankton, ice fauna and fish (poikilotherms, TL 1.7-3.3), and seabirds and seals (homeotherms, TL 3.3-4.2), with zooplankton representing the lowest and glaucous gull the highest trophic level.
		Concentrations of lipophilic and persistent organochlorines were orders of magnitude higher in homeotherms than in poikilotherms.
		It is preferable to calculate FWMFs with regard to thermal groups, because the different energy requirements and biotransformation abilities between poikilotherms and homeotherms may give different rates of contaminant increase with trophic level.
	pubs.acs.org /cgi-bin/jtext?esthag/36/i12/abs/es010231l (305 words)

	Physiological Ecology (Site not responding. Last check: 2007-10-13)
		They may not regulate at all, in which case they are poikilotherms, or they may use behavioral thermoregulation -- behave in ways that modify heat input/output through radiation, conduction, convection, and evaporative water loss so that they maintain constant body temperatures.
		We will look at examples of how poikilotherms, homeothermic ectotherms, and homeothermic endotherms respond and are adapted to dealing with environmental temperatures.
		Some poikilotherms can adjust the enzymes produced under different conditions to adjust to seasonal change in conditions.
	www.utm.edu /departments/cens/biology/rirwin/441_442/441PhysEc.htm (1878 words)

	Spartanburg SC \| GoUpstate.com \| Spartanburg Herald-Journal (Site not responding. Last check: 2007-10-13)
		One example is the swimming muscles of Tuna, which are warmed by a heat exchanger.
		For the same body weight poikilotherms need â“ to 1/10 of the energy of homeotherms.
		Warm-blooded for organisms that fall in between both categories.
	www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=Cold-blooded (893 words)

	Wildlife Habitats and Management Home Page
		An underlying issue in the environmental relations of both homeotherms and poikilotherms is how well they can adjust to threats from extreme ambient temperatures through use of external objects.
		It is this latter response that most interests us here, because in dealing with habitat issues we define these functional structures as a form cover, namely thermal cover.
		Energy required is much higher; hence food is correspondingly greater than in poikilotherms whose body temperature is maintained primarily by inputs from the ambient temperature.
	fwcb.cfans.umn.edu /courses/fw5603/lect9_thermal.htm (2502 words)

	Warm and cold blooded animals
		Poikilotherms are very often called cold-blooded animals but this is not really very accurate: the first time they pick up a snake most people are surprised how warm it feels, they expect it to be cold and slimy.
		For example, when a fish is swimming its muscles may become slightly warmer, and to minimise the heat loss to the water flowing through the gills some fishes have developed heat exchangers to take the heat out of the warmer blood entering the gills and putting it back into the colder blood leaving them.
		Poikilotherms do not become ill if their body temperature rises or falls, as homoiotherms would, they just become more or less active.
	www.barrygray.pwp.blueyonder.co.uk /Tutoring/Wmbl.html (1256 words)

	100lw-LabExB1a4 (Site not responding. Last check: 2007-10-13)
		Original: The process of acclimation takes place in many organisms, but it is crucial for poikilotherms.
		Poikilotherms are organisms that obtain their body heat from their immediate surroundings.
		Revision: The process of acclimation takes place in many organisms, but it is crucial for poikilotherms, organisms that obtain their body heat from their immediate surroundings.
	www.larc.uci.edu /lewc/100lw-LabExB1a4.html (90 words)

	Talk:Cold-blooded - Wikipedia, the free encyclopedia
		The subtle etymological difference being that the former refers to a variable body temperature and the latter to an organism dependant on external sources of heat.
		The paragraph that mentions large poikilotherms needs more information because not all members of the groups you have mentioned are poikilotherms.
		For example, a large dinosaur would be a homeotherm and the sea turtle a poikilotherm (some sea turtles may be homeotherms).
	en.wikipedia.org /wiki/Talk:Cold-blooded (650 words)

	Storing live lobsters (Site not responding. Last check: 2007-10-13)
		Low temperature is a critical factor in this scenario because lobsters (and lobster pathogens) are poikilotherms — meaning that they are unable to regulate their body temperatures through metabolism.
		The body temperature of poikilotherms is instead determined by the surroundings.
		(Aside: poikilotherms used to be called "cold-blooded," but this term is inaccurate because even though the blood is cold if the surroundings are cold, the body is warm if the surroundings are warm.)
	www.lobsters.org /ldoc/ldocpage.php?did=428 (302 words)

	EDCI 5724
		poikilotherms; they are cold-blooded organisms whose internal body temperatures are regulated by the outside temperature.
		poikilotherms) use the surrounding environment to heat up their internal body temperature, while warm-blooded organisms (
		SWBAT explain the difference between poikilotherms and homeotherms by explaining and giving examples of each.
	www.tandl.vt.edu /scied/lessons/probe_ware/probeware_Chris_Anna.htm (679 words)

	Amazon.com: "aquatic poikilotherms": Key Phrase page (Site not responding. Last check: 2007-10-13)
		Respiration is very intense in the squids; even without pigment cells, they are, for temperature and size, the aquatic poikilotherms with the highest rate of oxygen consumption.
		Aquatic poikilotherms typically have body temperatures that are essentially the same as water temperature.
		Thermal perturbation of function is particularly acute for aquatic poikilotherms such as fish, for the high heat capacity and relatively low oxygen content of aquatic environments combine to ensure that,...
	www.amazon.com /phrase/aquatic-poikilotherms (579 words)

	Homeotherms and Poikilotherms
		Another group of organisms known as poikilotherms have not developed mechanisms for regulating the temperature of their internal environment.
		Did you notice that the kookaburra could catch the lizard on a cold day when it was less active?
		When poikilotherms such as lizards are exposed to a cold environment their internal temperature also falls.
	www3.fhs.usyd.edu.au /bio/homeostasis/Htherms_and_Ptherms.htm (175 words)

	Cold-induced changes in thyroid function in a poikilothermic mammal, the naked mole-rat -- Buffenstein et al. 280 (1): ...
		Cold-induced changes in thyroid function in a poikilothermic mammal, the naked mole-rat -- Buffenstein et al.
		In conclusion, thyroid hormone concentrations are of a similar order of magnitude to those reported for other poikilotherms.
		Woodley, R. Cold-Acclimation in an Endothermic Poikilotherm, the Naked Mole-Rat (Heterocephalus glaber); Effects on Thermoregulation and Reproduction.
	ajpregu.physiology.org /cgi/content/full/280/1/R149 (3380 words)

	Lecture notes of Chapter 1
		Their blood must keep warm in order to perform biochemical reaction 1.2.
		Fish, amphibians, and reptiles are poikilotherms, their body temperature is the same as the temperature of their environment 1.3.
		Heat gain: through metabolism Metabolism: utilization of stored food in the body releases heat, so all living tissues produce heat Carbohydrates per gram produce 4 Kilocalories Protein..
	www.humboldt.edu /~sh4/p321notech10.htm (1970 words)

	Hibernation: Poikilotherms (ResearchIndex)
		Abstract: Introduction For cold-blooded or poikilothermic animals, winter presents challenges to survival.
		Since the body temperature (Tb) of poikilotherms is usually very close to that of their surrounding environment, the risk of death from freezing is very real when temperatures drop below 0C.
		Food is also scare during the winter and some animals also have limited mobility because the cold can make muscle movements slow or even induce a cold coma.
	citeseer.ist.psu.edu /storey01hibernation.html (193 words)

	1. Define and describe the difference between neutral, quasi neutral and lethal mutations
		Why can poikilotherms exist at smaller body sizes than homeotherms.
		Would you expect bioaccumulation to be greater through poikilotherms or homeotherms?
		How would you predict the rate of evolution (change in gene frequency) to be affected in a population reduced from 500 to 250 individuals by a deterministic event?
	www.uwf.edu /rsnyder/courses/ecology/essaall.html (2790 words)

	Drugs Approved for Use in Aquaculture (Poikilothermic Food Species)
		Drugs Approved for Use in Aquaculture (Poikilothermic Food Species)
		Total dose not to exceed 25,000 IU in fish intended for human consumption
		Approval applies only to use of the drug for the indications and manner specified on the label.
	www.fda.gov /cvm/4401.htm (382 words)

	Clastherm (Site not responding. Last check: 2007-10-13)
		Radiation - heat transfer through waves that release energy when they are absorbed by an object
		Poikilotherms - body temperature varies with ambient temperature
		Homeotherms - maintain constant body temperature regardless of ambient temperature
	people.eku.edu /sumithrans/eco/clastherm.html (106 words)

	Summary ecol1-
		Organisms can be divided into two major categories based on their response to variation in temperature
		How do homeotherms and poikilotherms respond to variation in temperature?
		Where do homeotherms and poikilotherms get heat to regulate body temperature?
	www.bio.georgiasouthern.edu /Bio-home/George-Sophie/Summary-ecol.html (539 words)

	Effects of acclimation temperature and cadmium exposure on cellular energy budgets in the marine mollusk Crassostrea ...
		poikilotherms are not well understood and it is not known whether
		Oysters are exposed to varying Cd concentrations in their habitats
		Sokolova, I. Cadmium effects on mitochondrial function are enhanced by elevated temperatures in a marine poikilotherm, Crassostrea virginica Gmelin (Bivalvia: Ostreidae).
	jeb.biologists.org /cgi/content/full/209/7/1274 (5571 words)

	Poikilotherms as reservoirs of Q-fever (Coxiella burnetii) in Uttar Pradesh -- Yadav and Sethi 15 (1): 15 -- Journal of ...
		Poikilotherms as reservoirs of Q-fever (Coxiella burnetii) in Uttar Pradesh -- Yadav and Sethi 15 (1): 15 -- Journal of Wildlife Diseases
		Poikilotherms as reservoirs of Q-fever (Coxiella burnetii) in Uttar Pradesh
		Sero-reactors were observed among water and rat snakes, pythons and tortoises.
	www.jwildlifedis.org /cgi/content/abstract/15/1/15 (98 words)

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