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| | Margaret Judge |
 | | The internal body temperature of poikilotherms changes in response to their surrounding temperatures. | | | poikilotherms = organisms whose internal body temperature changes with temperature changes in the external environment | | | The purpose of this experiment was to determine how the respiration rates of poikilotherms |
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http://spot.colorado.edu/~basey/judge.html
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| | Straight Dope Staff Report: What makes some animals cold-blooded and others warm- blooded? |
| | For example, some desert lizards, although ectotherms (receiving most of their heat from sunlight) are behavioral homeotherms. | | | (Don't things seem clearer already?) Basically, a homeotherm is an organism that maintains its body temperature at a nearly constant level, while a poikilotherm experiences much larger fluctuations. | | | The latter terms refer to the source of the body's heat. |
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http://www.straightdope.com/mailbag/mwarmblood.html
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| | Homeostatic Control Systems |
| | Mammals (derived from ancient poikilothermic reptiles) are often considered the most highly developed animals, breaking shackles of innate habits, and being able to adapt behaviour to changing circumstances. | | | 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). | | | They model response close to the set-points: further away, less-finely controlled emergency responses (such as massive shivering independent of skin temperature) come into play. |
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http://www.cogs.susx.ac.uk/users/adrianth/ecal97/node12.html
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| | 1993 Report of the AVMA Panel on Euthanasia |
| | Severing the spinal cord behind the head by pithing is an effective method of killing some poikilotherms. | | | These carcasses should be disposed of in a manner that will prevent them from being consumed by human beings or animals. | | | Inasmuch as death may not be immediate unless both the brain and spinal cord are pithed, double pithing is recommended. |
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http://www.nal.usda.gov/awic/pubs/noawicpubs/avmaeuth93.htm
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| | LectureM3 |
| | Importance of behavior to both homeotherms and poikilotherms |
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http://faculty.virginia.edu/bio202/lectures/LectureM3.htm
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| | Wildlife Habitats and Management Home Page |
| | Since our focus is on quadrupeds, we are concerned with both homeotherms and poikilotherms. | | | 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. | | | While water is an essential nutrient in terms of metabolic processes, we look at here with special emphasis on its role in preventing hyperthermia through evaporative cooling. |
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http://www.fw.umn.edu/fw5603/lect9_thermal.htm
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| | Re: do scientists believe all dinosaurs were cold-blooded? |
| | Third, poikilotherms live at a slower pace than homeotherms; they don't use as much energy. | | | Second, mammals and birds have a different kind of bone than modern reptiles; they have spongy areas in their bones where blood cells were made, but modern reptile bone is denser. | | | 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. |
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http://www.madsci.org/posts/archives/2001-02/983395292.Ev.r.html
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| | Shark Anatomy - Enchanted Learning Software |
| | Cold-blooded animals (poikilotherms) have a body temperature that changes with external conditions. | | | A related term is endothermy, meaning that an organism generates their own heat to maintain body temperatures. | | | Examples include reptiles, who need to sun themselves in the morning to warm up, and then protect themselves in the midday heat. |
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http://www.enchantedlearning.com/subjects/sharks/anatomy/Blood.shtml
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| | Food Web Magnification of Persistent Organic Pollutants in Poikilotherms and Homeotherms from the Barents Sea |
| | This study identified four organochlorine categories with different behavior with respect to rate of increase with trophic level in the food web. | | | Our study supports the significantly positive relationships between stable isotopes, as measures of trophic positions, and organochlorine concentrations previously established for the Canadian Arctic (e.g., refs 4, 44, and 45). | | | This is supported by our FWMFs for, for example, PCB-153, which were lower and higher for poikilotherms and homeotherms, respectively, than the previously determined values for this congener. |
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http://0-pubs.acs.org.darius.uleth.ca/cgi-bin/article.cgi/esthag/2002/36/i12/html/es010231l.html
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| | IX |
| | Poikilotherms match environmental temp through change in metabolic process or change in body temp, no internal mechanism, use of behavioral mechanism. | | | Metabolism – energy released as heat to tissues |
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http://www.umes.edu/natsciences/Envs/biol402/chap3.htm
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| | [No title] |
| | Many ectothermic lizards actually regulate their body temperatures fairly precisely during periods of activity by appropriate behavioural means, thus achieving homeothermy. | | | Thermoregulation has been the focus of attention in lizard ecology and natural history since the classic paper of Cowles and Bogert (1944). | | | Animals that maintain relatively constant internal body temperatures are homeotherms, whereas those whose body temperatures vary widely from time to time, often approximating the temperature of their immediate environment, are called poikilotherms. |
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http://uts.cc.utexas.edu/~varanus/lacertids.html
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| | thermoregulation -- Encyclopædia Britannica |
| | Warm-blooded animals (homoiotherms) have additional means by which they can heat and cool their bodies. | | | Cetaceans, like all mammals, have a four-chambered heart with paired ventricles and auricles. | | | Cold-blooded animals (poikilotherms) pick up or lose heat by way of the environment, moving from one place to another as necessary. |
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http://www.britannica.com/eb/article?eu=73969
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| | Cold-blooded - Wikipedia, the free encyclopedia |
| | For the same body weight poikilotherms need 1/3 to 1/10 of the energy of homeotherms. | | | This energy difference also means that a given niche of a given ecology can support three to ten times the number of poikilothermic animals as homeothermic animals. | | | Because their metabolism is so variable, poikilothermic animals do not easily support complex, high-energy organ systems such as brains or wings. |
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http://en.wikipedia.org/wiki/Poikilothermic
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| | Untitled Document |
| | Our next stop was Angela Farronato’s classroom at Mount Carmel Area High School for the Respiration Rate of Poikilotherms lab (our Experiment of the Month!). | | | You’ll enjoy a week of stimulating collaboration with some really wonderful teachers from the area, lots of hands-on experience with our equipment, ideas for labs that fit your curriculum, loads of Act 48 hours as well as a generous stipend for your time. | | | Angela’s students had been patiently waiting since February to complete this lab, since they got “snowed out” of their scheduled lab day. |
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http://www.susqu.edu/sim/mar/simnewsletter10may03.htm
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| | Forum 28799 |
| | Thermoregulation is any physiological or behavioral mechanism that acts to retain or generate body heat in environments colder than body temperature in order to prevent hypothermia, or that acts to remove body heat in environments warmer that body temperature in order to prevent hyperthermia. | | | Poikilotherms are organisms whose body temperatures are relatively variable, and change with the changing environmental temperature. | | | Homeotherms are organisms that maintain their body temperature within a very narrow range through a variety of thermoregulatory structural and physiological devices in widely varying environmental temperatures. |
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http://www.network54.com/Forum/message?forumid=28799&messageid=1033693009
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| | ECOCLUB.com Ecotourism News, Issue 42, November 2002 |
| | The difference between poikilotherms and humans here is that our bodies are designed to keep our body temperature at a constant level, in other words we're homeotherms. | | | "Poikilotherm organisms body temperature is affected by their surrounding environment. | | | Reptiles (which are poikilotherms) often sit in the sun to warm their bodies, and move to cooler areas to cool down. |
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http://www.ecoclub.com/news/42/quiz.html
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| | Dinosaurs: Warm or Cold Blooded |
| | Poikilotherms have a fluctuating internal body temperature that is dependent on surrounding environmental conditions. | | | There body temperature can range form very high to very low. | | | Ectothermy has contributed to the ongoing success of the arthropods, fish, reptiles, and all modern animals with the exception of mammals and birds. |
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http://www.priweb.org/ed/ICTHOL/ICTHOL04papers/72.htm
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| | Temperature and Blood Types |
| | Actually, the terms homeothermic (maintain a constant body temperature) and poikilothermic (get their body heat from their surroundings) is more descriptive. | | | Poikilotherms use the heat from the environment, so they don't need to eat as often. | | | Homeotherms use some of the energy they get from burning food to keep their bodies at the same temperature all the time. |
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http://www.newton.dep.anl.gov/askasci/zoo00/zoo00641.htm
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| | [No title] |
| | Poikilotherms can rely on behavior and microhabitat selection to help regulate body temperature. | | | Endotherms — animals that generate "internal heat" through metabolic processes. | | | Ectotherm — do not have the physiological capabilities to generate "internal heat" while resting. |
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http://webserve.govst.edu/science/faculty/yunger/EcoNotes/EcoNotes2.html
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| | Hibernation |
| | The reliance of these animals upon warmth from their environments for their body heat necessitates that they anticipate the onset of cold conditions and not be caught out of their hibernaculae by potentially lethal cold temperatures. | | | The disadvantage of consequential dormancy is that the organism is exposed to potentially damaging environmental conditions (poikilotherms in particular are especially vulnerable to the stresses of consequential dormancy). | | | Other animals enter their hibernative state only after being exposed to adversely cold conditions. |
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http://www.nk.psu.edu/naturetrail/Winter/hibernation.htm
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| | Freezin' Frogs |
| | Physiologists categorize frogs and other amphibians as ectothermic, poikilotherms (i.e., cold blooded) which means that their body temperatures fluctuate in response to that of their external surroundings. | | | This is well and good for the eggs, but what about the frogs that laid them? | | | As environmental temperatures drop, frogs exhibit a corresponding decline in body temperature as well as metabolic rate. |
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http://www.towson.edu/users/forester/freezin'frogs.html
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| | Thermal Physiology |
| | REGULATION of body core temperature in vertebrates relies strongly on a region of the brain comprised of the preoptic area and anterior hypothalamus (POAH). | | | HETEROTHERMS are animals that sometimes function as homeotherms and sometimes function as poikilotherms (for instance, hibernators). | | | HOMEOTHERMS (also known as warm-blooded animals) are able to maintain their body core temperature relatively constant in the range of 35 to 40°C (or 95 to 104°F) despite large variations in the temperature of their environment. |
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http://www.circadian.org/thermal.html
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| | pooreddlemen |
| | Only this extreme condition in homoiotherms is correctly recognized as true hibernation. | | | Some poikilotherms survive the winter by lapsing into a dormant state in which all of their metabolic activities decrease to the point at which a frequent input of food is not required, and the body temperature drops to that of the environment. | | | Most animals have to depend on the absorption of heat from a suitable environmental temperature to activate their physiological functions. |
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http://www.jaeger.ws/poorwill/poor_deddleman.html
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| | New Page 1 |
| | However, contrary to what is usually observed in most poikilotherms (i.e. | | | Heterocephalus glaber), unlike other mammals, are unable to effectively employ endothermy with the net result that these mammals are operatively poikilotherms. | | | Cold-induced changes in thyroid function in a poikilothermic mammal, the naked mole-rat ( |
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http://www.interaction.nu.ac.za/Genetics2003/new_page_1.htm
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| | Crnokrak abstract |
| | Levels of inbreeding depression this high will be biologically important under natural conditions. | | | Mean inbreeding depression ±SE for homeotherms was 0.509±0.081; for poikilotherms, 0.201±0.039; and for plants, 0.331±0.038. | | | In this review we have gathered estimates of inbreeding depression from the literature for wild species monitored in the field. |
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http://conbio.net/SCB/activities/Meetings/2001/Website/abstracts/Crnokrak.htm
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| | Warm and cold blooded animals |
| | But although ectotherms cannot raise their body temperature to any significant extent by producing heat internally, many have developed ways of heating themselves up in other ways. | | | 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. |
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http://www.barrygray.pwp.blueyonder.co.uk/Tutoring/Wmbl.html
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| | AllRefer.com - body temperature : Cold-blooded Animals (Poikilotherms) (Anatomy And Physiology) - Encyclopedia |
| | You are here : AllRefer.com > Reference > Encyclopedia > Anatomy And Physiology > body temperature | | | AllRefer.com - body temperature : Cold-blooded Animals (Poikilotherms) (Anatomy And Physiology) - Encyclopedia | | | The body temperature of fishes must remain close to that of the surrounding water, because heat is lost directly into the water during respiration; however, in some fishes, such as the bluefin tuna, a special network of fine veins and arteries called the rete mirabile provides a thermal barrier against loss of metabolic heat. |
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http://reference.allrefer.com/encyclopedia/B/bodytemp-cold-blooded-animals-(poikilotherms).html
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| | Content and binding characteristics of the mitochondrial ATPase inhibitor, IF1, in the tissues of several slow and fast ... |
| | These experiments suggest that, while pig and rabbit heart mitochondria contain a full complement of higher-affinity IF1, pigeon, guinea pig, turtle, and frog heart mitochondria cell contain essentially a full complement of a lower-affinity form of IF1. | | | The IF1 binding experiments were run at both species-endogenous IF1 levels and at an IF1 level normalized to that present in rabbit heart mitochondria. | | | Content and binding characteristics of the mitochondrial ATPase inhibitor, IF1, in the tissues of several slow and fast heart-rate homeothermic species and in two poikilotherms. |
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http://www.pdg.cnb.uam.es/UniPub/iHOP/gp/306051.html
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| | 100lw-LabExB1a4 |
| | 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. | | | Original: The process of acclimation takes place in many organisms, but it is crucial for poikilotherms. |
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http://www.larc.uci.edu/lewc/100lw-LabExB1a4.html
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| | poikilothermy |
| | Poikilotherms are often referred to as ‘cold-blooded animals’, but this is not correct: their internal temperatures, regulated by behavioural means, are often as high as those of birds and mammals during the times they need to be active for feeding and reproductive purposes, and may be higher, for example in very hot climates. | | | The main difference is that their body temperatures fluctuate more than those of homeotherms. | | | It is characteristic of all animals except birds and mammals, which maintain their body temperatures by homeothermy (they are ‘warm-blooded’). |
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http://www.tiscali.co.uk/reference/encyclopaedia/hutchinson/m0008092.html
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| | Bio 183 Unit 9 Textbook Answers |
| | Poikilotherms are organisms that have a body temperature that varies with that of the environment. | | | Ectotherms are organisms that lose metabolic heat to the environment without it affecting their body temperatures. | | | Organisms that are poikilotherms and ectotherms commonly are called “cold-blooded.” |
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http://dtc.pima.edu/~biology/183/09_183/09_183answers.html
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| | Homeostasis and Temperature Control |
| | Poikilotherms used to be referred to as cold-blooded. | | | Poikilotherms cannot maintain a body temperature above that of their environment. | | | Because of this, small animals lose body heat very easily while large animals may have problems keeping cool. |
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http://www.coweshigh.org.uk/subjects/science/year10/biology/homeostasis_and_temperature_cont.htm
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| | Temperature and Allometry |
| | Environmental temperatures greatly affect the rates of all of the physiological processes of poikilotherms. | | | Other animals may be homeostatic in regards to oxygen, ion concentration etc. but let their body temperature fluctuate with that of the environment. | | | In addition, constant and fluctuating are relative terms and some mammals such as sloths are homeotherms but sloppy homeotherms, letting their body temperature wander a few degrees here and there. |
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http://facweb.furman.edu/~dhaney/35metab.htm
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| | [No title] |
| | Poikilotherms - Animals whose body temperature is labile, it moves with the temperature of their environment. | | | Homeotherms - are at the other end of the spectrum, these animals have a variety of structural and physiological adaptations which maintain their body temperature at a very stable value in spite of wide fluctuations in their environmental temperature. | | | At the extremes in the animal world are what in the popular language are referred to as warm-blooded and cold-blooded animals. |
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http://www.science-aquinas.co.uk/biology/body_temp.htm
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| | Re: [Re: [Re: Insulation does not = "Warm-blooded"]] |
| | > > If they have no "choice" but to be poikilotherms and bradymetabolic, > they aren't great examples, then. | | | Besides, I already mentioned the arthropods, which are terrestrial, bradymetabolic poikilotherms, though I'm sure you were hoping for something that was at least within vertebrata, in which case, I'll see what I can do. | | | __________________________________________ > > But there are no examples of terrestrial, insulated (by fat or > integument, which are not as comparable, I think, as you say), > bradymetabolic, poikilotherms. |
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http://dml.cmnh.org/2001Apr/msg00363.html
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| | Inna Sokolova's Home Page |
| | of my research is a study of physiological mechanisms of environmental adaptation and stress tolerance in marine poikilotherms. | | | We use marine mollusks (oysters and snails) as models for our research. | | | 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. |
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http://www.bioweb.uncc.edu/Faculty/Sokolova
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| | [No title] |
| | Like other poikilotherms, an insect's body temperature fluctuates with the environment. | | | Poikiotherms derive their heat from external sources, thus their body temperature fluctuates with the temperature of their environment. | | | Crickets are insects, the most numerous class of organisms. |
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http://www.accessexcellence.org/LC/TE/PW/EXP/TI-K/tikintro.html
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| | Homeotherms and Poikilotherms |
| | Another group of organisms known as poikilotherms have not developed mechanisms for regulating the temperature of their internal environment. | | | When poikilotherms such as lizards are exposed to a cold environment their internal temperature also falls. | | | This makes the enzymes less efficient and so the animals become less active. |
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http://www3.fhs.usyd.edu.au/bio/homeostasis/Htherms_and_Ptherms.htm
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| | For Your Survival, You Need To Know . . . |
| | Poikilotherms have higher energy transfer rates because they rely on ambient temperature to regulate their body temperature. | | | Homeotherms have low energy transfer rates because they use a large portion of the energy they ingest to maintain their body temperature. | | | Cold-blooded animals (poikilotherms): often higher than 10%, usually in the range of 5% - 15%. |
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http://www.ccet.ua.edu/hhmi/pages/energytransfer.html
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| | SFB_618 - Temperature dependence of temporal resolution in an insect nervous system. |
| | The vast majority of animals are poikilotherms, and thus face the problem that the temperature of their nervous systems rather smoothly follows the temperature changes imposed by their environment. | | | Since basic properties of nerve cells, e.g., the time constants of ion channels, strongly depend on temperature, a temperature shift likely affects the processing of the temporal structure of sensory stimuli. |
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http://biologie.hu-berlin.de/forschung/SFB_618_new/Members/admin/Franz2002
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| | Slide 1 |
| | • - poikilotherms expend little or no energy maintaining body temp...... | | | • problem 2: slope of 0.75 applies to poikilotherms as well! |
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http://instruct.uwo.ca/zoology/441a-notes/272b_lecture_4_files/slide0036.htm
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| | Shark Glossary: P - EnchantedLearning.com |
| | Poikilotherms are animals whose internal temperature changes depending on the environment. | | | A polyphyletic group consists of organisms but not their common ancestors. | | | The toothed whales travel in large, sometimes stable pods; they frequently hunt their prey in groups, migrate together, and share care of their young. |
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http://www.enchantedlearning.com/subjects/sharks/glossary/indexp.shtml
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| | Research |
| | For example, the hearts of active teleosts such as the salmonids contract robustly under hypothermic conditions which are cardioplegic to mammals. | | | Fish, being poikilotherms, are exposed to and must function under a wide range of environmental temperatures and pH. |
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http://www.sfu.ca/%7Etibbits/research/research.htm
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| | Scand-LAS Symposium 1998: Rolf Nordmo |
| | Defined and fully controlled aquatic environments are extremely difficult to manage, due to the variability of the many water parameters that may influence the research outcome. | | | This is largely due to essential differences between the aquatic test systems required to study fish or other aquatic poikilotherms, and test systems designed for the study of homeothermic terrestrial animals. | | | The repeatability of experiments involving fish can often be predicted to be low. |
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http://oslovet.veths.no/scandlas/abstracts/nordmoeng.html
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| | paf |
| | Poikilotherms: Poison arrow frogs are Poikilothermic which means the temperature of their body is affected by the temperature of their surroundings. | | | Sometimes people refer to this as being " cold blooded ".If the temperature falls, the frogs become sluggish; if it gets warm, they become very active. | | | At present, there are no species of poison arrow frog that are threatened with extinction, but as with all tropical animals, their habitats are endangered. |
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http://www.thewildones.org/Animals/paf.html
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| | Diseases of Special Pet Animals and Poikilotherms, with Clinical Training -- index |
| | To provide a thorough theoretical and practical knowledge on the diagnosis and treatment of disease conditions in special pet animals such as companion birds, rodents, furred animals and poikilotherms. | | | Diseases of Special Pet Animals and Poikilotherms, with Clinical Training | | | This course focusses on various aspects of diseases in special pet animals. |
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http://aivwww.rug.ac.be/Studentenadministratie/Studiegids/2004/EN/FACULTY/DI/COURSE/GPARTS/03O00019/INDEX.HTM
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| | Holohil Systems Ltd. - SB-2, SI-2 & AI-2 |
| | When fitted with a temperature sensor, the pulse rate is adjusted to accommodate the wide body temperature range of poikilotherms. | | | For other applications the pulse rate can be set to measure narrower temperature ranges. |
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http://www.holohil.com/snake.htm
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| | [No title] |
| | 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.) |
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http://www.lobsters.org/ldoc/f2000/ldoc0002.html
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