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Density dependence in roe deer population dynamics

Kjellander, Petter (2000). Density dependence in roe deer population dynamics. Diss. (sammanfattning/summary) Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae. Silvestria, 1401-6230
ISBN 91-576-5888-9
[Doctoral thesis]

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Abstract

Density dependence on individual and cohort level was investigated experimentally in a twelve-year study on free living roe deer (Capreolus capreolus) population in Sweden. The deer were protected for 4 years, which caused density to increase from 9 to 36 deer/km2. Then density was reduced to 8 deer/km2by two seasons of intensive culling. After this the population has been allowed to recover. The study was based on radio telemetry with 382 marked deer. Food availability and browsing pressure was monitored by an exclosure study.
Density dependence was demonstrated in important components of demography, i.e. body weight, growth, fecundity and survival. I also found that negative effects of high density experienced during the first two years of life will affect the deer for the rest of their lives (cohort effects). Fecundity (ovulation), fawn/marked doe in fall and body weight were found to decrease in all age classes after the density increase. Likewise, body size decreased in age classes raised during the period with high density. Long-term consequences of early development on lifetime reproduction and survival were significant. Survival decreased in all age classes, also in the prime age animals. Lowest survival and strongest density effects were found in juveniles. The negative effect on survival persisted in all age classes at least for three years after peak density. I hypothesize that much of this time lag was a cohort effect coupled to lasting effects on body mass.
Male summer territory size decreased significantly with increasing population density, as did winter range size in both sexes. I suggest that much of the effect of deer density on winter home range size was coupled to the solitary behavior and social system of roe deer, with possible effects of dominance rank also outside the mating season. Further, no relationship was found between population density and the main winter food, standing bilberry (Vaccinium myrtillus) biomass, but a significant effect on the twig abundance was observed. Finally, I found indications of food limitation that might be both dampened and fortified by density independent changes in the environment.

Authors/Creators:Kjellander, Petter
Title:Density dependence in roe deer population dynamics
Year of publishing :2000
Number:154
Number of Pages:32
Publisher:Swedish University of Agricultural Sciences
ISBN for printed version:91-576-5888-9
ISSN:1401-6230
Language:English
Publication Type:Doctoral thesis
Article category:Other scientific
Version:Published version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Keywords:cohort effect, demography, density dependence, lifetime reproduction, population limitation, predation, roe deer, survival, social system
URN:NBN:urn:nbn:se:slu:epsilon-p-107958
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-107958
ID Code:17691
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Institutionen för naturvårdsbiologi (fr.o.m. 970101)
Deposited By: SLUpub Connector
Deposited On:05 Oct 2020 12:29
Metadata Last Modified:15 Oct 2020 12:47

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