全球智库信息集成服务系统(G2TT): The evolution of conditional dispersal and reproductive isolation along environmental gradients.

G2TT

来源类型	Article
规范类型	其他
DOI	10.1016/j.jtbi.2010.12.036
	The evolution of conditional dispersal and reproductive isolation along environmental gradients.
	Payne JL; Mazzucco R; Dieckmann U
发表日期	2011
出处	Journal of Theoretical Biology 273 (1): 147-155
出版年	2011
语种	英语
摘要	Dispersal modulates gene flow throughout a population's spatial range. Gene flow affects adaptation at local spatial scales, and consequently impacts the evolution of reproductive isolation. A recent theoretical investigation has demonstrated that local adaptation along an environmental gradient, facilitated by the evolution of limited dispersal, can lead to parapatric speciation even in the absence of assortative mating. This and other studies assumed unconditional dispersal, so individuals start dispersing without regard to local environmental conditions. However, many species disperse conditionally; their propensity to disperse is contingent upon environmental cues, such as the degree of local crowding or the availability of suitable mates. Here, we use an individual-based model in continuous space to investigate by numerical simulation the relationship between the evolution of threshold-based conditional dispersal and parapatric speciation driven by frequency-dependent competition along environmental gradients. We find that, as with unconditional dispersal, parapatric speciation occurs under a broad range of conditions when reproduction is asexual, and under a more restricted range of conditions when reproduction is sexual. In both the asexual and sexual cases, the evolution of conditional dispersal is strongly influenced by the slope of the environmental gradient: shallow environmental gradients result in low dispersal thresholds and high dispersal distances, while steep environmental gradients result in high dispersal thresholds and low dispersal distances. The latter, however, remain higher than under unconditional dispersal, thus undermining isolation by distance, and hindering speciation in sexual populations. Consequently, the speciation of sexual populations under conditional dispersal is triggered by a steeper gradient than under unconditional dispersal. Enhancing the disruptiveness of frequency-dependent selection, more box-shaped competition kernels dramatically lower the speciation-enabling slope of the environmental gradient.
主题	Evolution and Ecology (EEP)
关键词	Frequency-dependent selection Sexual reproduction Speciation Evolutionary branching Competition kernels
URL	http://pure.iiasa.ac.at/id/eprint/9632/
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/129342
推荐引用方式 GB/T 7714	Payne JL,Mazzucco R,Dieckmann U. The evolution of conditional dispersal and reproductive isolation along environmental gradients.. 2011.