Results 1 -
6 of
6
anadromous
, 2014
"... Diverse juvenile life-history behaviours contribute to the spawning stock of an ..."
Abstract
- Add to MetaCart
(Show Context)
Diverse juvenile life-history behaviours contribute to the spawning stock of an
Diet Quality Limits Summer Growth of Field Vole Populations
"... Marked variation occurs in both seasonal and multiannual population density peaks of northern European small mammal species, including voles. The availability of dietary proteins is a key factor limiting the population growth of herbivore species. The objective of this study is to investigate the de ..."
Abstract
- Add to MetaCart
(Show Context)
Marked variation occurs in both seasonal and multiannual population density peaks of northern European small mammal species, including voles. The availability of dietary proteins is a key factor limiting the population growth of herbivore species. The objective of this study is to investigate the degree to which protein availability influences the growth of increasing vole populations. We hypothesise that the summer growth of folivorous vole populations is positively associated with dietary protein availability. A field experiment was conducted over a summer reproductive period in 18 vegetated enclosures. Populations of field voles (Microtus agrestis) were randomised amongst three treatment groups: 1) food supplementation with ad libitum high protein (30 % dry weight) pellets, 2) food supplementation with ad libitum low protein (1 % dry weight; both supplemented foods had equivalent energy content) pellets, and 3) control (no food supplementation), n = 6 per treatment. Vole density, survival, demographic attributes and condition indicators were monitored with live-trapping and blood sampling. Highest final vole densities were attained in populations that received high protein supplementation and lowest in low protein populations. Control populations displayed intermediate densities. The survival rate of voles was similar in all treatment groups. The proportion of females, and of those that were pregnant or lactating, was highest in the high protein supplemented populations. This suggests that variation in reproductive, rather than survival rates of voles, accounted for density differences between the treatment groups. We found no clear association
rspb.royalsocietypublishing.org Review
, 2014
"... parental effects, developmental plasticity, Author for correspondence: Can environmental conditions experienced in early life influence future generations? an individual can ‘acquire ’ any number of phenotypes, often with long-termTim Burton ..."
Abstract
- Add to MetaCart
(Show Context)
parental effects, developmental plasticity, Author for correspondence: Can environmental conditions experienced in early life influence future generations? an individual can ‘acquire ’ any number of phenotypes, often with long-termTim Burton
BIOLOGY by
, 2012
"... This thesis, written by Robin N. Abbey-Lee, and entitled, Relative Role of Dispersal Dynamics and Competition in Niche Breadth having been approved in respect to style and intellectual content, is referred to you for judgment. We have read this thesis and recommend that it be approved. ..."
Abstract
- Add to MetaCart
This thesis, written by Robin N. Abbey-Lee, and entitled, Relative Role of Dispersal Dynamics and Competition in Niche Breadth having been approved in respect to style and intellectual content, is referred to you for judgment. We have read this thesis and recommend that it be approved.
