open access

https://hdl.handle.net/2115/82129

Effects of environmental synchrony and density-dependent dispersal on temporal and spatial slopes of Taylor's law

英語

Taylor's law

2020-06-02

John Wiley & Sons

Population ecology

62(3)

300-316

Taylor's law (TL) is an empirical rule that describes an approximate relationship between the variance and mean of population density: log(10)(variance) approximate to log(10)(a) + b x log(10)(mean). Population synchrony is another prevailing feature observed in empirical populations. This study investigated the effects of environmental synchrony and density-dependent dispersal on the temporal (b( T)) and spatial (b( S)) slopes of TL, using an empirical dataset of gray-sided vole populations and simulation analyses based on the second-order autoregressive (AR) model. Eighty-five empirical populations satisfied the temporal and spatial TLs with b( T) = 1.943 (+/- SE 0.143) and b( S) = 1.579 (+/- SE 0.136). The pairwise synchrony of population was 0.377 +/- 0.199 (mean +/- SD). Most simulated populations that obeyed the AR model satisfied the form of the temporal and spatial TLs without being affected by the environmental synchrony and density-dependent dispersal; however, those simulated slopes were too steep. The incorporation of environmental synchrony resulted in reduced simulated slopes, but those slopes, too, were still unrealistically steep. By incorporating density-dependent dispersal, simulated slopes decreased and fell within a realistic range. However, the simulated populations without environmental synchrony did not exhibit an adequate degree of density synchrony. In simulations that included both environmental synchrony and density-dependent dispersal, 92.7% of the simulated datasets provided realistic values for b( T), b( S) and population synchrony. Because the two slopes were more sensitive to the variation of density-dependent dispersal than that of environmental synchrony, density-dependent dispersal may be the key to the determination of b( T) and b( S).

学術雑誌論文

Accepted Manuscript

This is the peer reviewed version of the following article: https://esj-journals.onlinelibrary.wiley.com/doi/full/10.1002/1438-390X.12051, which has been published in final form at https://doi.org/10.1002/1438-390X.12051 This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.

1438-3896