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• W2023870183 abstract "The degree of phenotypic divergence and reproductive isolation between taxon pairs can vary quantitatively, and often increases as evolutionary divergence proceeds through various stages, from polymorphism to population differentiation, ecotype and race formation, speciation, and post-speciational divergence. Although divergent natural selection promotes divergence, it does not always result in strong differentiation. For example, divergent selection can fail to complete speciation, and distinct species pairs sometimes collapse ('speciation in reverse'). Widely-discussed explanations for this variability concern genetic architecture, and the geographic arrangement of populations. A less-explored possibility is that the degree of phenotypic and reproductive divergence between taxon pairs is positively related to the number of ecological niche dimensions (i.e., traits) subject to divergent selection. Some data supporting this idea stem from laboratory experimental evolution studies using Drosophila, but tests from nature are lacking. Here we report results from manipulative field experiments in natural populations of herbivorous Timema stick insects that are consistent with this 'niche dimensionality' hypothesis. In such insects, divergent selection between host plants might occur for cryptic colouration (camouflage to evade visual predation), physiology (to detoxify plant chemicals), or both of these niche dimensions. We show that divergent selection on the single niche dimension of cryptic colouration can result in ecotype formation and intermediate levels of phenotypic and reproductive divergence between populations feeding on different hosts. However, greater divergence between a species pair involved divergent selection on both niche dimensions. Although further replication of the trends reported here is required, the results suggest that dimensionality of selection may complement genetic and geographic explanations for the degree of diversification in nature." @default.
• W2023870183 created "2016-06-24" @default.
• W2023870183 creator A5030592051 @default.
• W2023870183 creator A5032107832 @default.
• W2023870183 date "2008-04-02" @default.
• W2023870183 modified "2023-10-01" @default.
• W2023870183 title "Ecological Niche Dimensionality and the Evolutionary Diversification of Stick Insects" @default.
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• W2023870183 doi "https://doi.org/10.1371/journal.pone.0001907" @default.
• W2023870183 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2270911" @default.
• W2023870183 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18382680" @default.
• W2023870183 hasPublicationYear "2008" @default.
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