Estimating the growth of a newly established moose population using reproductive value

Sæther, Bernt‐Erik; Engen, Steinar; Solberg, Erling Johan; Heim, Morten

doi:10.1111/j.0906-7590.2007.05006.x

Cited by 30 publications

(32 citation statements)

References 40 publications

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“…Our results largely confirm such habitat specialization (Fig. 3), which we also expected given that our study population does not show signs of density dependence in any life history trait (Saether et al 2007). However, we did not find support for sex differences in functional responses per se (habitat selection as a function of relative habitat availability, Mysterud and Ims 1998).…”

Section: Discussionsupporting

confidence: 89%

Use, selection, and home range properties: complex patterns of individual habitat utilization

et al. 2019

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Individual patterns of habitat use emerge from behavioral decisions driven by interactions between landscape characteristics and individual traits. Individual traits, such as age and sex, influence the net gain of using habitats and associated resources, and thus the relationship between size and composition of the home range. However, the pathways from individual variation in home range size and composition to habitat selection are rarely fully explored. We investigated how habitat selection in moose (Alces alces) was a result of individual traits and home range characteristics, that is, we described the pathway from home range to habitat selection. The study was conducted at two spatial scales during two contrasting seasons. Home range size and composition varied with sex, with season, and to some extent with age. Males had larger home range size, and the composition of their home ranges changed more with home range size than for females. The general trend was that moose used habitats according to availability more in winter than in summer, that is, a weaker habitat selection in winter than in summer. Sex and age explained little of the variation in habitat selection, but sex had a pronounced effect on the relationship between home range size and composition. Because habitat availability (i.e., home range composition) is a component of habitat selection, it suggests that varying habitat use partly compensates for sex‐specific differences in home range composition, which in turn results from home range settlement. Hence, although males and females showed similar habitat selection, they differed in the underlying mechanisms generating the pattern of habitat selection. These complex interactions between individual traits and environmental variation have consequences for how we understand the relationships between landscape characteristics, individual behavior, and fitness.

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Section: Discussionsupporting

confidence: 89%

Use, selection, and home range properties: complex patterns of individual habitat utilization

et al. 2019

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“…3,4) also suggest that weather during spring or early summer influences the rate of fetus loss and/or the proportion of calves surviving to the autumn. Given the very high survival rates of moose calves previously reported from Norway (Stubsjøen et al 2000;Saether et al 2007c), we believe that this effect is mainly operating as fetus loss and/ or calf mortality just after birth.…”

Section: Discussionmentioning

confidence: 81%

Geographical variation in the influence of density dependence and climate on the recruitment of Norwegian moose

et al. 2009

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The effects of variation in climate on population dynamics are likely to differ within the distributional range of a species, yet the consequences of such regional variation on demography and population dynamics are rarely considered. Here we examine how density dependence and different climate variables affect spatio-temporal variation in recruitment rates of Norwegian moose using data collected over a large geographical area during the hunting season. After accounting for observation error by a Bayesian Markov chain Monte Carlo technique, temporal variation in recruitment rates was relatively independent of fluctuations in local population size. In fact, a positive relationship was as common as a density-dependent decrease in fecundity rates. In general, high recruitment rates were found during autumn 1 year after years with a warm February, and after a warm May or cold June in year t - 1 or in year t. Large regional variation was also found in the effects of some of the weather variables, especially during spring. These patterns demonstrate both direct and delayed effects of weather on the recruitment of moose that possibly operate through an effect of body mass on the proportion of the females that sexually mature as 1.5 or 2.5 years old.

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“…The long-run population growth rate from time step 1 to T (Tuljapurkar and Orzack 1980;Tuljapurkar et al 2003) can, according to Saether et al (2007), be written as…”

Section: The Modelmentioning

confidence: 99%

How Life History Influences Population Dynamics in Fluctuating Environments

Sæther

Coulson

Grøtan

et al. 2013

The American Naturalist

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A major question in ecology is how age-specific variation in demographic parameters influences population dynamics. Based on long-term studies of growing populations of birds and mammals, we analyze population dynamics by using fluctuations in the total reproductive value of the population. This enables us to account for random fluctuations in age distribution. The influence of demographic and environmental stochasticity on the population dynamics of a species decreased with generation time. Variation in age-specific contributions to total reproductive value and to stochastic components of population dynamics was correlated with the position of the species along the slow-fast continuum of life-history variation. Younger age classes relative to the generation time accounted for larger contributions to the total reproductive value and to demographic stochasticity in "slow" than in "fast" species, in which many age classes contributed more equally. In contrast, fluctuations in population growth rate attributable to stochastic environmental variation involved a larger proportion of all age classes independent of life history. Thus, changes in population growth rates can be surprisingly well explained by basic species-specific life-history characteristics. JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org. Submitted December 17, 2012; Accepted June 19, 2013; Electronically published October 25, 2013 abstract: A major question in ecology is how age-specific variation in demographic parameters influences population dynamics. Based on long-term studies of growing populations of birds and mammals, we analyze population dynamics by using fluctuations in the total reproductive value of the population. This enables us to account for random fluctuations in age distribution. The influence of demographic and environmental stochasticity on the population dynamics of a species decreased with generation time. Variation in age-specific contributions to total reproductive value and to stochastic components of population dynamics was correlated with the position of the species along the slow-fast continuum of life-history variation. Younger age classes relative to the generation time accounted for larger contributions to the total reproductive value and to demographic stochasticity in "slow" than in "fast" species, in which many age classes contributed more equally. In contrast, fluctuations in population growth rate attributable to stochastic environmental variation involved a larger proportion of all age classes independent of * Corresponding author; e-mail: bernt.erik.sather@bio.ntnu.no.Am. Nat. 2013. Vol. 182, pp. 743-759. ᭧ 2013 by The University of Chicago. 0003-0147/2013/18206-54347$15.00. All rights reserved. DOI: 10.1086/67349...

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Estimating the growth of a newly established moose population using reproductive value

Cited by 30 publications

References 40 publications

Use, selection, and home range properties: complex patterns of individual habitat utilization

Use, selection, and home range properties: complex patterns of individual habitat utilization

Geographical variation in the influence of density dependence and climate on the recruitment of Norwegian moose

How Life History Influences Population Dynamics in Fluctuating Environments

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