全球智库信息集成服务系统(G2TT): Timing and propagule size of invasion determine its success by a time-varying threshold of demographic regime shift.

G2TT

来源类型	Article
规范类型	其他
DOI	10.1890/13-1527.1
	Timing and propagule size of invasion determine its success by a time-varying threshold of demographic regime shift.
	Yamamichi M; Yoshida T; Sasaki A
发表日期	2014
出处	Ecology 95 (8): 2303-2315
出版年	2014
语种	英语
摘要	Theory of invasion ecology indicates that the number of invading individuals (propagule size) and the timing of invasion are important for invasion success. Propagule size affects establishment success due to an Allee effect and the effect of demographic stochasticity, whereas the timing of invasion does so via niche opportunity produced by fluctuating predation pressure and resource abundance. We propose a synthesis of these two mechanisms by a time-varying dose-response curve where the dose is propagule size and the response is establishment probability. We show an example of the synthesis in a simple predator-prey model where successful invasion occurs as a demographic regime shift because of the bistability of the system. The two mechanisms are not independent, but simultaneously determine invasion success in our model. We found that positive growth rate of an invading species does not ensure its establishment, especially when its propagule size is small or when its growth rate is in a decreasing trend. We suggest the difficulty of understanding invasion process based on a dose-response curve of propagule size as no unique curve can be determined due to the effects of invasion timing (i.e., the threshold of demographic regime shift is time varied). The results of our model analysis also have an implication on the phase relationship between population cycles of predators and prey.
主题	Evolution and Ecology (EEP)
关键词	Allee effect Alternative stable states Antiphase cycles Bistability Eco-evolutionary dynamics Evolutionary cycles Fluctuating resource Invasibility Limit cycles Niche opportunity Propagule pressure Rapid evolution
URL	http://pure.iiasa.ac.at/id/eprint/10873/
来源智库	International Institute for Applied Systems Analysis (Austria)
引用统计
资源类型	智库出版物
条目标识符	http://119.78.100.153/handle/2XGU8XDN/130009
推荐引用方式 GB/T 7714	Yamamichi M,Yoshida T,Sasaki A. Timing and propagule size of invasion determine its success by a time-varying threshold of demographic regime shift.. 2014.