Hybridization and adaptive radiation.

By Ole Seehausen. Trends in Ecology & Evolution, 2004

1,781 citations recorded by the source corpus.

Whether interspecific hybridization is important as a mechanism that generates biological diversity is a matter of controversy. Whereas some authors focus on the potential of hybridization as a source of genetic variation, functional novelty and new species, others argue against any important role, because reduced fitness would typically render hybrids an evolutionary dead end. By drawing on recent developments in the genetics and ecology of hybridization and on principles of ecological speciation theory, I develop a concept that reconciles these views and adds a new twist to this debate. Because hybridization is common when populations invade new environments and potentially elevates rates of response to selection, it predisposes colonizing populations to rapid adaptive diversification under disruptive or divergent selection. I discuss predictions and suggest tests of this hybrid swarm theory of adaptive radiation and review published molecular phylogenies of adaptive radiations in light of the theory.

Subfields: Ecology, Genetics

View Paper: https://www.semanticscholar.org/paper/75724669ebd6f8a34edc00222acc52932414e3ae

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Citations in the corpus

Patterns of hybridization in plants (2010, background): “Alternately, it may be that hybridization is itself a key ingredient triggering adaptive radiation in such habitats, via the generation of large amounts of genetic and phenotypic novelty (Seehausen, 2004).”
A molecular approach to detect hybridisation between crucian carp (Carassius carassius) and non-indigenous carp species (Carassius spp. and Cyprinus carpio) (2005, background): “However, it should also be emphasised that natural hybridisation is now increasingly seen as an important evolutionary factor to initiate speciation and adaptive radiations (Alves, Coelho & CollaresPereira, 1997; Dowling & Secor, 1997; Seehausen, 2004 ).”
Redefining the Role of Admixture and Genomics in Species Conservation (2018, background): “Evolutionary relationships constructed with markers that are predominantly inherited from one parent as a single non-recombining locus cannot accurately distinguish between species that originate from true bifurcation events and those that arise from hybridization with subsequent introgression (Seeh”
Geographical Parthenogenesis: Opportunities for Asexuality (2009, background): “Rieseberg et al. 2003; Seehausen 2004; Rieseberg and Willis 2007; Mallet 2007).”
Ancient Lake Ohrid: biodiversity and evolution (2008, background): “…et al., 2007), sexual selection (e.g., Seehausen, 2006), adaptive radiation (e.g., von Rintelen et al., 2004; Herder et al., 2006), hybridization (e.g., Seehausen, 2004), and punctuated equilibrium (e.g., Williamson, 1981; Gould, 1992) are, at least partly, based on studies of ancient lake taxa.”
Hybridisation with introduced chukars (Alectoris chukar) threatens the gene pool integrity of native rock (A. graeca) and red-legged (A. rufa) partridge populations (2007, background): “Consequently, hybrid zones are sometimes regarded to as evolutionary dead ends, or, in contrast, as genetic melting pots that can potentially foster the emergence of evolutionary novelties ( Seehausen, 2004 ).”
Hybridization and speciation (2013, background): “There is likely to be a positive feedback between hybridization and speciation (Seehausen, 2004): hybridization may increase the rate of speciation, and the resulting diversity of closely related species may then provide more opportunities for hybridization.”
Cichlid fishes as models of ecological diversification: patterns, mechanisms, and consequences (2015, background): “, 2007), where adaptive radiations may have arisen from hybrid swarms (Seehausen, 2004).”
Ecology and Evolution of the African Great Lakes and Their Faunas (2014, background): “F or p er so na l u se o nl y. ES45CH23-Salzburger ARI 28 October 2014 13:26 radiation (and ecological speciation), as it enhances genetic diversity and produces new (transgressive) phenotypes, thereby facilitating the potential for adaptive diversification (Seehausen 2004).”
Natural hybridization and conservation (2009, background): “Thus, natural hybridization may be an important process in shaping the evolutionary trajectories of many plants and animals (Eckenwalder 1984; Grant and Grant 1992; Dowling and DeMarais 1993; Arnold 1997; Rieseberg et al. 2003; Seehausen 2004 ).”
Adaptive introgression in animals: examples and comparison to new mutation and standing variation as sources of adaptive variation (2013, background): “In addition, adaptive introgression might be important in providing the genetic variation for the high rate of diversification documented in some adaptive radiations (Seehausen 2004; The Heliconius Genome Consortium 2012).”
Understanding the establishment success of non-indigenous fishes: lessons from population genetics (2007, background): “Invasions are often linked to habitat disturbance and associated changes in environmental conditions which could provide favourable conditions for novel adaptations (Seehausen, 2004).”
The monophyly of island radiations: an evaluation of niche pre‐emption and some alternative explanations (2005, background): “SG suggest that hybrid swarms (Seehausen 2004) might stimulate radiation and offer the example of the Hawaiian silversword alliance, although the hybrid event in the history of this group occurred before its solitary colonization of Hawai’i.”
Ecology of plant speciation (2010, background): “Seehausen (2004) has advanced the “hybrid swarm” hypothesis for adaptive radiations, noting that (1) recent hybrid ization and introgression greatly increases genetic variation at large numbers of loci; (2) greater genetic variation can lead to more rapid response to ecological selection for…”
Marine invasion genetics: from spatio-temporal patterns to evolutionary outcomes (2014, background): “Similarly to interspecific hybridisation (Ellstrand and Schierenbeck 2000; Seehausen 2004; de Carvalho et al. 2013), genetic admixture may create novel allelic combinations that enhance the fitness of introduced individuals.”
Ancient hybridization fuels rapid cichlid fish adaptive radiations (2017, neutral): “LV alleles found in the Congolese taxa (polymorphic in LVRS even without Upper Nile hybridization), (3) only one allele found in Congolese but both alleles”
Allopatric speciation with little niche divergence is common among alpine Primulaceae (2016, background): “Whether or not these groups are of hybrid origins and whether or not this influenced diversification rates, as suggested by Seehausen (2004), remains to be explored.”
Evolving coral reef conservation with genetic information (2014, background): “…populations because of their unique genetic make-up? should we protect contact zones where distinct lineages mix to preserve hybrid areas as potential adaptive zones (seehausen 2004, Moritz et al. 2009), or should we focus on protecting the core ranges of these lineages and ignore hybrid zones?”