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All amphibians are poikilotherms, that is, they are totally dependent upon their environment to regulate body temperature and metabolic activity.
With regard to fish, one would not expect that metabolic body size as predicted by Kleiber's (1932) formula would apply because fish muscles are not working against gravity and because fish are poikilotherms.
Food web magnification of persistent organic pollutants in poikilotherms and homeotherms from the Barents Sea, Environ.
Plants are poikilotherms and most do not produce sufficient heat to raise the temperature of bulk tissue.
Temperature-induced shift in foraging ability in two fish species, roach (Rutilus rutilus) and perch (Perca fluviatilis): implications for coexistence between poikilotherms.
Today, the three main groups of amphibians--salamanders, frogs, and toads--are found worldwide but, as is true of other poikilotherms (animals with variable body temperature), the majority dwell in tropical and temperate regions.
Like other poikilotherms, development of PFB is dependent on the ambient temperature, thus completion of pupation period and emergence of adults is likely to vary with the outside temperatures.
The growth performance in poikilotherms is generally optimized at the lower range of the organism's thermal tolerance under low-food situations (Jobling, 1997), but there is a lack of such studies at life stages when organisms are dependent on endogenous resources.
In an insightful review of growth rate variation in plants, homoiotherms, and poikilotherms, Arendt (1997) concludes that high maximum growth rates are selected under conditions of low environmental stress, but this ability trades off with efficient use of resources (or tissue differentiation).