"Detection and understanding of the impacts of marine pollutants, eggshell thinning from DDT, and anthropogenic body size shifts in widespread species, are examples of the power of natural history collections".
Both islands separated from the mainland approximately 8.3 kya, indicating that body size shifts can occur rapidly.
Apparent discrepancies in the observed patterns may partly reflect clade-specific responses to underlying ecological factors, adding an additional level of complexity to interpretations of insular body size shifts [14].
Body size shifts are also common in island snake populations, and have been explained by changes in available prey, decreased intensity of interspecific competition, and relaxed predation pressures [23], [24].
In a large-scale study that included C. mitchellii, Boback [24] concluded that island area was not supported as a determinant of body size shifts in island snakes; however, it is likely that the scale of his analysis precluded an adequate evaluation of intraspecific patterns.
Selection on body size shifted from exponential to linear to disruptive with increasing breeding density.
(1) Animals of various sizes, including sexually mature medusae were present at all sampling times; (2) while large and sexually mature animals prevailed in the population in the beginning of the sampling period, body sizes shifted from large to medium through time and sexual maturity decreased accordingly.
One thing nearly everyone agrees on is that the cultural conversation around food and body size must shift, along with media messages promoting images of waiflike models and an estimated $61 billion a year weight loss industry, in which the vast majority of dieters regain their weight within five years.
We simulated 58 matings among the 141 males of the natural population with the 101 females whose body sizes were shifted towards larger body by 0.25 mm.
"It's pretty clear that the shift in ocean dynamics is at 3 million years ago, and what we estimate for the shift in body size is definitely no older than 4.5 million years ago and could be as recent as a few hundred thousand years ago," Slater said.
