If this relatively narrow range in annual concentration extremes of both fish and turtles is typical of contaminant behavior in ectotherms
, this may simplify the prediction of concentration levels and assessments of ecological risk in these animals.
Adult size in ectotherms
: temperature effects on growth and differentiation.
For several species of ectotherm
, fat content is increased when culture temperature is reduced (e.g., Lang 1963; Gilbert and O'Connor 1970; Collatz 1973).
We discuss the results of our experiment in terms of the ways in which terrestrial ectotherms
acquire and store energy in seasonal environments, and how the allocation of resources to reproduction may be modified by morphological and physiological constraints on reproductive output and trade-offs with other life history traits.
There is a second line of evidence that refutes the applicability of Bergmann's Rule to ectotherms
, that also points to the developmental mechanism underlying geographic variation in body size.
But Chinsamy also found evidence that this small predatory dinosaur stopped growing when it reached adulthood - a pattern typical of endotherms and not of ectotherms
. What's more, the structure of the Syntarsus bone indicated that the animal grew rapidly, another characteristic of endotherms.
It has been suggested that insularity could affect life history and body size in ectotherms
(Novosolov et al.
Impacts of climate warming on terrestrial ectotherms
There is evidence that Bergmann's rule applies to not only endotherms but also ectotherms
. Ray (1960) found that 13 of 17 poikilotherms followed Bergmann's rule.
The researchers used red flour beetles to test sensitivity to temperature in coldblooded ectotherms
, species that don't regulate their own body temperature, in contrast to endotherms, such as humans.
Thermal tolerance of many aquatic ectotherms
has been calculated through the critical thermal limits, consisting of exposing the fish to a constant increase or decrease rate of water temperature until a non-lethal endpoint is reached.