A Combinatorial View on Speciation and Adaptive Radiation

Marques, David Alexander; Meier, Joana I.; Seehausen, Ole

doi:10.1016/j.tree.2019.02.008

Cited by 398 publications

(416 citation statements)

References 121 publications

Supporting

Mentioning

393

Contrasting

Order By: Relevance

“…Hybridization between different species is an important evolutionary process that can provide fundamental insights into the molecular mechanisms of reproductive isolation and adaptation. The outcomes of interspecific gene flow can be seen as a continuum of two extremes: erosion of species barriers through merging of gene pools (Allendorf, Leary, Spruell, & Wenburg, ) or evolution of new species through novel adaptive trait combinations in hybrids (Gompert, Fordyce, Forister, Shapiro, & Nice, ; Marques, Meier, & Seehausen, ; Seehausen, , ). Recent studies have emphasized the importance of symbiotic microbes in animal speciation, with particular focus on their roles in hybrid incompatibility and reinforcement of existing species boundaries (Brucker & Bordenstein, ).…”

Section: Discussionmentioning

confidence: 99%

Host hybridization as a potential mechanism of lateral symbiont transfer in deep‐sea vesicomyid clams

et al. 2019

View full text Add to dashboard Cite

Deep‐sea vesicomyid clams live in mutualistic symbiosis with chemosynthetic bacteria that are inherited through the maternal germ line. On evolutionary timescales, strictly vertical transmission should lead to cospeciation of host mitochondrial and symbiont lineages; nonetheless, examples of incongruent phylogenies have been reported, suggesting that symbionts are occasionally horizontally transmitted between host species. The current paradigm for vesicomyid clams holds that direct transfers cause host shifts or mixtures of symbionts. An alternative hypothesis suggests that hybridization between host species might explain symbiont transfers. Two clam species, Archivesica gigas and Phreagena soyoae, frequently co‐occur at deep‐sea hydrocarbon seeps in the eastern Pacific Ocean. Although the two species typically host gammaproteobacterial symbiont lineages marked by divergent 16S rRNA phylotypes, we identified a number of clams with the A. gigas mitotype that hosted symbionts with the P. soyoae phylotype. Demographic inference models based on genome‐wide SNP data and three Sanger sequenced gene markers provided evidence that A. gigas and P. soyoae hybridized in the past, supporting the hypothesis that hybridization might be a viable mechanism of interspecific symbiont transfer. These findings provide new perspectives on the evolution of vertically transmitted symbionts and their hosts in deep‐sea chemosynthetic environments.

show abstract

Section: Discussionmentioning

confidence: 99%

Host hybridization as a potential mechanism of lateral symbiont transfer in deep‐sea vesicomyid clams

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Hybridization is increasingly recognized as an important evolutionary phenomenon in plants (Mallet 2005;Arnold 2006;Whitney et al 2010), animals (Mallet 2005;Schwenk et al 2008), and fungi (reviewed in Albertin and Marullo 2012). Hybridization has been linked to important processes such as evolution and diversification (Anderson and Stebbins 1954;Seehausen 2004), adaptive radiation (Anderson and Stebbins 1954;Stebbins 1959;Barton 2001;Seehausen 2004;Yakimowski and Rieseberg 2014;Marques et al 2019), and speciation (Rieseberg 2003;Mallet 2007;Rieseberg et al 2007;Soltis and Soltis 2009;Abbott et al 2013). Hybridization has enabled plant breeders to transfer desirable traits among species for both agricultural and horticultural purposes (Allard 1999).…”

Section: Impact Summarymentioning

confidence: 99%

Correlates of hybridization in plants

et al. 2019

View full text Add to dashboard Cite

Hybridization is a biological phenomenon increasingly recognized as an important evolutionary process in both plants and animals, as it is linked to speciation, radiation, extinction, range expansion and invasion, and allows for increased trait diversity in agricultural and horticultural systems. Estimates of hybridization frequency vary across taxonomic groups, but causes of this variation are unknown. Here, we ask on a global scale whether hybridization is linked to any of 11 traits related to plant life history, reproduction, genetic predisposition, and environment or opportunity. Given that hybridization is not evenly distributed across the plant tree of life, we use phylogenetic generalized least squares regression models and phylogenetic path analysis to detect statistical associations between hybridization and plant traits at both the family and genus levels. We find that perenniality and woodiness are each weakly associated with an increased frequency of hybridization in univariate analyses, but path analysis suggests that the direct linkage is between perenniality and increased hybridization (with woodiness having only an indirect relationship with hybridization via perenniality). Weak associations between higher rates of hybridization and higher outcrossing rates, abiotic pollination syndromes, vegetative reproductive modes, larger genomes, and less variable genome sizes are detectable in some cases but not others. We argue that correlational evidence at the global scale, such as that presented here, provides a robust framework for forming hypotheses to examine and test drivers of hybridization at a more mechanistic level.

show abstract

“…; Marques et al. ). The absence of an allopatric phase in the past (criterion 4) is also generally difficult to demonstrate because it requires concrete information on the geological history of the relevant region and/or on the demographic history of the species themselves.…”

mentioning

confidence: 98%

Evidence for sympatric speciation in a Wallacean ancient lake

et al. 2019

View full text Add to dashboard Cite

Sympatric speciation has been demonstrated in few empirical case studies, despite intense searches, because of difficulties in testing the criteria for this mode of speciation. Here, we report a possible case of sympatric speciation in ricefishes of the genus Oryzias on Sulawesi, an island of Wallacea. Three species of Oryzias are known to be endemic to Lake Poso, an ancient tectonic lake in central Sulawesi. Phylogenetic analyses using RAD‐seq‐derived single nucleotide polymorphisms (SNPs) revealed that these species are monophyletic. We also found that the three species are morphologically distinguishable and clearly separated by population‐structure analyses based on the SNPs, suggesting that they are reproductively isolated from each other. A mitochondrial DNA chronogram suggested that their speciation events occurred after formation of the tectonic lake, and existence of a historical allopatric phase was not supported by coalescent‐based demographic inference. Demographic inference also suggested introgressive hybridization from an outgroup population. However, differential admixture among the sympatric species was not supported by any statistical tests. These results all concur with criteria necessary to demonstrate sympatric speciation. Ricefishes in this Wallacean lake provide a promising new model system for the study of sympatric speciation.

show abstract

A Combinatorial View on Speciation and Adaptive Radiation

Cited by 398 publications

References 121 publications

Host hybridization as a potential mechanism of lateral symbiont transfer in deep‐sea vesicomyid clams

Host hybridization as a potential mechanism of lateral symbiont transfer in deep‐sea vesicomyid clams

Correlates of hybridization in plants

Evidence for sympatric speciation in a Wallacean ancient lake

Contact Info

Product

Resources

About