DNA barcoding will often fail to discover new animal species over broad parameter space

被引:328
作者
Hickerson, Michael J. [1 ]
Meyer, Christopher P.
Moritz, Craig
机构
[1] Univ Calif Berkeley, Museum Vertabrate Zool, Berkeley, CA 94720 USA
[2] Univ Florida, Florida Museum Nat Hist, Gainesville, FL 32611 USA
基金
美国国家科学基金会;
关键词
D O I
10.1080/10635150600969898
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
With increasing force, genetic divergence of mitochondrial DNA (mtDNA) is being argued as the primary tool for discovery of animal species. two thresholds of single-gene divergence have been proposed: reciprocal monophyly, and 10 times greater genetic divergence between than within species (the "10 x rule"). To explore quantitiatively the utility of each approach, we couple neutral coalescent theory and the classical Bateson-dobzhansky-Muller (BDM) model of speciation. The joint stochastic dynamics of these two processes demonstrate that both thresholds fail to "discover" many reproductively isolated lineages under a single incompatibility BDM model, especially when BDM loci have been subject to divergent selection. Only when populations have been isolated for > 4 million generations did these thresholds achieve error rates of < 10% under our model that incorporates variable population sizes. The high error rate evident in simulations is corroborated with six empirical data sets. These properties suggest that single-gene, high-throughput approaches to discovering new animal species will bias large-scale biodiversity surveys, particularly toward missing reproductively isolated lineages that have emerged by divergent selection or other mechanisms that accelerate reproductive isolation. Because single-gene thresholds for species discovery can result in substantial error at recent divergences times, they will misrepresent the correspondence between recently isolated populations and reproductively isolated lineages (= species).
引用
收藏
页码:729 / 739
页数:11
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