Journal ArticleDOI
Decomposing the variation in population growth into contributions from multiple demographic rates
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TLDR
The retrospective matrix method provides a good approximation of the demographic rate associated most strongly with variation in population growth, however, failure to incorporate the contribution of covariation between demographic rates when decomposing variation inpopulation growth can lead to spurious conclusions.Abstract:
Summary
1
The decomposition of variation in population growth into the relative contributions from different demographic rates has multiple uses in population, conservation and evolutionary biology Recent research has favoured methods based on matrix models termed ‘life-table-response experiments’ or more generally ‘the retrospective matrix method’, which provide an approximation of a complete demographic decomposition The performance of the approximation has not been assessed
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We compare the performance of the retrospective matrix method to a complete decomposition for two bighorn sheep populations and one red deer population
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Different demographic rates make markedly different contributions to variation in growth rate between populations, because each population is subject to different types of environmental variation
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The most influential demographic rates identified from decomposing observed variation in population growth are often not those showing the highest elasticity Consequently, those demographic rates most strongly associated with deterministic population growth are not necessarily strongly associated with temporal variation in population growth
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The retrospective matrix method provides a good approximation of the demographic rate associated most strongly with variation in population growth However, failure to incorporate the contribution of covariation between demographic rates when decomposing variation in population growth can lead to spurious conclusionsread more
Citations
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Perceived Predation Risk Reduces the Number of Offspring Songbirds Produce per Year
TL;DR: The results suggest that the perception of predation risk is itself powerful enough to affect wildlife population dynamics, and should thus be given greater consideration in vertebrate conservation and management.
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Global declines of caribou and reindeer
Liv Solveig Vors,Mark S. Boyce +1 more
TL;DR: The authors examined the mechanisms by which climate warming and anthropogenic landscape change influence caribou and reindeer population dynamics, namely changes in phenology, spatiotemporal changes in species overlap, and increased frequency of extreme weather events.
Journal ArticleDOI
Demography in an increasingly variable world.
TL;DR: This work discusses how understanding the demographic consequences of environmental variation will have applications for anticipating changes in populations resulting from anthropogenic activities that affect the variance in vital rates and highlights new tools for anticipating the magnitude and temporal patterning of environmental variability.
Journal ArticleDOI
Red Deer: Behaviour and Ecology of Two Sexes, T.H. Clutton-Brock, F.E. Guinness, S.D. Albon. Edinburgh University Press, Edinburgh (1982), xxii, + 378 Price £20.10 hardback, £9.75 paperback
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Conservation of caribou (Rangifer tarandus) in Canada: an uncertain future11This review is part of the virtual symposium “Flagship Species – Flagship Problems” that deals with ecology, biodiversity and management issues, and climate impacts on species at risk and of Canadian importance, including the polar bear (Ursus maritimus), Atlantic cod (Gadus morhua), Piping Plover (Charadrius melodus), and caribou (Rangifer tarandus).
TL;DR: Caribou (Rangifer tarandus (L., 1758)) play a central role in the ecology and culture of much of Canada, where they were once the most abundant cervid as mentioned in this paper.
References
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Book
Matrix population models : construction, analysis, and interpretation
TL;DR: In this article, the age-classified matrix model was used to analyze the life-cycle graph sensitivity analysis and evolutionary demography statistical inference time-varying and stochastic models.
Book
Matrix Population Models
TL;DR: Matrix population models are discrete-time structured population models in which individuals are classified into discrete stages (age classes, size classes, developmental stages, spatial locations, etc.) as discussed by the authors.
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Red Deer: Behavior and Ecology of Two Sexes
TL;DR: Red Deer: Behavior and Ecology of Two Sexes is the most extensive study yet available of reproduction in wild vertebrate and reveals the extent of sex differences in behavior, reproduction, and ecology.
Journal ArticleDOI
Temporal Variation in Fitness Components and Population Dynamics of Large Herbivores
TL;DR: In large-herbivore populations, environmental variation and density dependence co-occur and have similar effects on various fitness components and how that variability affects changes in population growth rates is examined.
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