The simple rationale behind these studies was that changing climate should lead to changes in body size as predicted by Bergmann's Rule.
Changes in body size have important repercussions for our understanding of ecosystems over the long-term, so any change in fish and other vertebrates at this time would have important ecological consequences.
Furthermore, time seems to play a role, as the more pronounced changes in body size in the fossil record result from a longer time span, as species simply had more time to evolve.
Studies based on large data sets of insular mammals found that island area is indeed a large factor in the gigantism of small mammals, but for everything larger than a rat, the absence of predators and decreased competition with competitors are the main drivers behind these changes in body size.
"Instead we concentrated on large-scale changes in body size.
A placebo-control design was used to examine the effect of alcohol on changes in body size discrepancy and self-awareness among female participants (N = 57).
She explains selective sweeps with the example of earwax and presents in nice detail two examples of very recent human evolution: evidence for changes in body size and physiology from the Framingham Heart Study and adaptation to high altitude.
The models explore the effects of both changes in body size (which affect the time scale over which organisms integrate operative body temperatures) and increases in the mean and variance of temperature on the thermal landscape.
These changes are caused by the many physiologic changes that occur during pregnancy (eg, altered hormone levels, increased urination at night, changes in body size) and post partum, especially with a newborn to tend.
This study sought to determine how dietary patterns, self-esteem, depressive symptoms, and intention to lose weight were associated with body size among adolescent African-American mothers 1 year after delivery and with changes in body size over the next year.
Changes in body size (weight z score, crude weight and height) between birth and the follow up visits were calculated.
