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Patterns and processes of population dynamics with fluctuating habitat size: a case study of a marine copepod inhabiting tide pools

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Title: Patterns and processes of population dynamics with fluctuating habitat size: a case study of a marine copepod inhabiting tide pools
Authors: Fukaya, Keiichi Browse this author
Shirotori, Wakako Browse this author
Kawai, Momoka Browse this author
Noda, Takashi Browse this author →KAKEN DB
Issue Date: Feb-2013
Publisher: Blackwell Publishing
Journal Title: Oikos
Volume: 122
Issue: 2
Start Page: 235
End Page: 246
Publisher DOI: 10.1111/j.1600-0706.2012.20515.x
Abstract: The logistic model is a fundamental population model often used as the basis for analyzing wildlife population dynamics. In the classic logistic model, however, population dynamics may be difficult to characterize if habitat size is temporally variable because population density can vary at a constant abundance, which results in variable strength of density-dependent feedback for a given population size. To incorporate habitat size variability, we developed a general population model in which changes in population abundance, density, and habitat size are taken into account. From this model, we deduced several predictions for patterns and processes of population dynamics: (1) patterns of fluctuation in population abundance and density can diverge, with respect of their correlation and relative variability; and (2) along with density dependence, habitat size fluctuation can affect population growth with a time lag because changes in habitat size result in changes in population density. In order to test these predictions, we applied our model to population dynamics data of 36 populations of Tigriopus japonicus, a marine copepod inhabiting tide pools of variable sizes caused by weather processes. As expected, we found a significant difference in the fluctuation patterns of population abundance and density of T. japonicus populations with respect to the correlation between abundance and density and their relative variability, which correlates positively with the variability of habitat size. In addition, we found direct and lagged-indirect effects of weather processes on population growth, which were associated with density dependence and impose regulatory forces on local and regional population dynamics. These results illustrate how changes in habitat size can have an impact on patterns and processes of wildlife population dynamics. We suggest that without knowledge of habitat size fluctuation, measures of population size and its variability as well as inferences about the processes of population dynamics may be misleading.
Rights: The definitive version is available at www.onlinelibrary.wiley.com
Type: article (author version)
URI: http://hdl.handle.net/2115/54590
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 深谷 肇一

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