NDLI: Effects of spatial structure of population size on the population dynamics of barnacles across their elevational range.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Fukaya, Keiichi Okuda, Takehiro Nakaoka, Masahiro Noda, Takashi
Spatial Coverage	Japan
Description	Country affiliation: Japan Author Affiliation: Fukaya K ( The Institute of Statistical Mathematics, 10-3 Midoricho, Tachikawa, Tokyo, 190-8562, Japan.); Okuda T ( National Research Institute of Far Seas Fisheries, Fisheries Research Agency, 2-12-4, Fukuura, Kanazawa-ku, Yokohama, Kanagawa, 236-8648, Japan.); Nakaoka M ( Akkeshi Marine Station, Field Science Center for Northern Biosphere, Hokkaido University, Aikappu, Akkeshi, Hokkaido, 088-1113, Japan.); Noda T ( Faculty of Environmental Science, Hokkaido University, N10W5, Kita-ku, Sapporo, Hokkaido, 060-0810, Japan.)
Abstract	Explanations for why population dynamics vary across the range of a species reflect two contrasting hypotheses: (i) temporal variability of populations is larger in the centre of the range compared to the margins because overcompensatory density dependence destabilizes population dynamics and (ii) population variability is larger near the margins, where populations are more susceptible to environmental fluctuations. In both of these hypotheses, positions within the range are assumed to affect population variability. In contrast, the fact that population variability is often related to mean population size implies that the spatial structure of the population size within the range of a species may also be a useful predictor of the spatial variation in temporal variability of population size over the range of the species. To explore how population temporal variability varies spatially and the underlying processes responsible for the spatial variation, we focused on the intertidal barnacle Chthamalus dalli and examined differences in its population dynamics along the tidal levels it inhabits. Changes in coverage of barnacle populations were monitored for 10.5 years at 25 plots spanning the elevational range of this species. Data were analysed by fitting a population dynamics model to estimate the effects of density-dependent and density-independent processes on population growth. We also examined the temporal mean-variance relationship of population size with parameters estimated from the population dynamics model. We found that the relative variability of populations tended to increase from the centre of the elevational range towards the margins because of an increase in the magnitude of stochastic fluctuations of growth rates. Thus, our results supported hypothesis (2). We also found that spatial variations in temporal population variability were well characterized by Taylor's power law, the relative population variability being inversely related to the mean population size. Results suggest that understanding the population dynamics of a species over its range may be facilitated by taking the spatial structure of population size into account as well as by considering changes in population processes as a function of position within the range of the species.
File Format	HTM / HTML
ISSN	00218790
e-ISSN	13652656
Journal	Journal of Animal Ecology
Issue Number	6
Volume Number	83
Language	English
Publisher	Wiley-Blackwell
Publisher Date	2014-11-01
Publisher Place	Great Britain (UK)
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Environmental Health Discipline Zoology Ecosystem Thoracica Physiology Animals Bayes Theorem Models, Biological Population Density Population Dynamics Seasons Spatial Analysis Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Animal Science and Zoology Ecology, Evolution, Behavior and Systematics

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Data from: Effects of spatial structure of population size on the population dynamics of barnacles across their elevational range (Dataset)

Optimal population prediction of sandhill crane recruitment based on climate-mediated habitat limitations.

Spatial scaling of mountain pine beetle infestations.

Australian barnacles (Cirripedia: Thoracica), distributions and biogeographical affinities.

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Effects of spatial structure of population size on the population dynamics of barnacles across their elevational range.