Our sampling sites were part of two broad-scale biodiversity monitoring programs on farming properties, travelling stock reserves and roadside verges . It could get faster as the Y becomes more unstable, or it could stabilize as the Y is stripped to essential genes. We explored the relationship between morphology and phylogenetic structure before modeling candidate variables from four broad domains: 1 geography latitude, longitude and elevation2 climate temperature and rainfall3 habitat vegetation type, number of logs and ground cover attributesand 4 management land use and grazing history.
This rule, which is independent of gender, was originally reserved to explain interspecific differences in body size, although modern interpretations often extend the rule to include intraspecific investigations. Integr Zool 8: —
Pieau, Claude. It is used in reference to species with temperature-dependent sex determination, such as crocodilians and turtles. Hormones and temperature show signs of acting in the same pathway, in that less hormone is required to produce a sexual shift as the incubation conditions near the pivotal temperature.
They did so to test the predictions of the Charnov-Bull model. Sign in. Namespaces Article Talk.
The Am Nat: — Biol J Linn Soc 39— Maximum-likelihood phylogenetic tree. Individuals with low levels of aromatase during the thermosensitive period will develop male characteristics. Clearly further research is required to test the mechanisms that drive body size evolution in reptiles, including whether observed patterns are consistent over different spatial scales .
Sex chromosome change has occurred very rarely in mammals, so it seems significant that each change corresponds to a major divergence. So has the human Y finally stabilised? Perhaps this has already happened in some small isolated population, where genetic accidents are much more likely to take hold.
However, studies on ectothermic vertebrates remain controversial  — . Environmental factors play an important role in influencing growth rate and body condition in reptiles .