On being the right size: food-limited feedback on optimal body size.
An insular population of white-tailed deer Odocoileus virginianus introduced in 1896 to predator-free Anticosti Island, Quebec, has caused long-term changes in the plant community. Food quality declined as did body weight. Although different parameters of reproduction changed, overall reproductive rates remained similar, thus maintaining deer density and promoting further change in habitat. These results show (i) long-term feedbacks on carrying capacity, (ii) the mechanism for reduction of body mass, and (iii) the lack of strong reduction in reproductive rates to regulate the population at high density, a feature of Eutherians. They are relevant to mechanisms determining the evolution of vertebrate body sizes.
Anthony R E
Sinclair
S
Centre for Biodiversity Research, 6270 University Boulevard University of British Columbia, Vancouver V6T 1Z4, Canada. sinclair@zoology.ubc.ca
John P
Parkes
P
D000818:Animals; D049628:Body Size / Q000502:physiology; D001835:Body Weight / Q000502:physiology*; D003670:Deer / Q000033:anatomy & histology* / Q000502:physiology*; D017753:Ecosystem; D005260:Female; D005523:Food Supply; D008297:Male; D011156:Population Density; D011157:Population Dynamics; D011158:Population Growth; D012098:Reproduction / Q000502:physiology*