scholarly journals A model of sympatric speciation through assortative mating

2005 ◽  
Vol 347 ◽  
pp. 534-574 ◽  
Author(s):  
Franco Bagnoli ◽  
Carlo Guardiani
Keyword(s):  
Assortative Mating ◽  
Sympatric Speciation

scholarly journals Sympatric Speciation in Threespine Stickleback: Why Not?

2011 ◽  
Vol 2011 ◽  
pp. 1-15 ◽  
Author(s):  
Daniel I. Bolnick
Keyword(s):  
Sexual Dimorphism ◽  
Assortative Mating ◽  
Intraspecific Competition ◽  
Gasterosteus Aculeatus ◽  
Theoretical Models ◽  
Sympatric Speciation ◽  
Threespine Stickleback ◽  
Disruptive Selection ◽  
Evolutionary Diversification ◽  
Trait Variance

Numerous theoretical models suggest that sympatric speciation is possible when frequency-dependent interactions such as intraspecific competition drive disruptive selection on a trait that is also subject to assortative mating. Here, I review recent evidence that both conditions are met in lake populations of threespine stickleback (Gasterosteus aculeatus). Nonetheless, sympatric speciation appears to be rare or absent in stickleback. If stickleback qualitatively fit the theoretical requirements for sympatric speciation, why do they not undergo sympatric speciation? I present simulations showing that disruptive selection and assortative mating in stickleback, though present, are too weak to drive speciation. Furthermore, I summarize empirical evidence that disruptive selection in stickleback drives other forms of evolutionary diversification (plasticity, increased trait variance, and sexual dimorphism) instead of speciation. In conclusion, core assumptions of sympatric speciation theory seem to be qualitatively reasonable for stickleback, but speciation may nevertheless fail because of (i) quantitative mismatches with theory and (ii) alternative evolutionary outcomes.

Emergence and loss of assortative mating in sympatric speciation

2009 ◽  
Vol 258 (3) ◽  
pp. 465-477 ◽  
Author(s):  
Fabiano Ribeiro ◽  
Nestor Caticha
Keyword(s):  
Assortative Mating ◽  
Sympatric Speciation

Conditions for sympatric speciation: A diploid model incorporating habitat fidelity and non-habitat assortative mating

1996 ◽  
Vol 10 (2) ◽  
pp. 187-205 ◽  
Author(s):  
Paul A. Johnson ◽  
F. C. Hoppensteadt ◽  
James J. Smith ◽  
Guy L. Bush
Keyword(s):  
Assortative Mating ◽  
Sympatric Speciation ◽  
Habitat Fidelity ◽  
Diploid Model

scholarly journals Positive assortative mating between recently described sympatric morphs of Icelandic sticklebacks

2006 ◽  
Vol 2 (2) ◽  
pp. 250-252 ◽  
Author(s):  
Gudbjörg Á Ólafsdóttir ◽  
Michael G Ritchie ◽  
Sigurdur S Snorrason
Keyword(s):  
Mate Choice ◽  
Reproductive Isolation ◽  
Assortative Mating ◽  
Gasterosteus Aculeatus ◽  
Sympatric Speciation ◽  
Threespine Stickleback ◽  
Positive Assortative Mating ◽  
Important Character ◽  
Nest Type ◽  
Sympatric Morphs

Recently, models of sympatric speciation have suggested that assortative mating can develop between sympatric morphs due to divergence in an ecologically important character. For example, in sympatric pairs of threespine stickleback ( Gasterosteus aculeatus L.) size-assortative mating seems to be instrumental in reproductive isolation. Here, we examine courtship behaviour and assortative mating of newly described sympatric stickleback morphs in Lake Thingvallavatn, Iceland. We find that the two morphs show strong positive assortative mating. However, the mechanism involved in mate choice does not seem to be as straightforward as in other similar systems of sympatric stickleback morphs and may involve variation in nest type.

scholarly journals Experimental Swap of Anopheles gambiae's Assortative Mating Preferences Demonstrates Key Role of X-Chromosome Divergence Island in Incipient Sympatric Speciation

PLoS Genetics ◽  
2015 ◽  
Vol 11 (4) ◽  
pp. e1005141 ◽  
Author(s):  
Fred Aboagye-Antwi ◽  
Nahla Alhafez ◽  
Gareth D. Weedall ◽  
Jessica Brothwood ◽  
Sharanjit Kandola ◽  
...  
Keyword(s):  
Assortative Mating ◽  
X Chromosome ◽  
Sympatric Speciation ◽  
Mating Preferences

scholarly journals Sympatric speciation based on pure assortative mating

2020 ◽  
Vol 53 (15) ◽  
pp. 155601
Author(s):  
R A Caetano ◽  
Sergio Sanchéz ◽  
Carolina L N Costa ◽  
Marcus Aloizio Martinez de Aguiar
Keyword(s):  
Assortative Mating ◽  
Sympatric Speciation

scholarly journals Sympatric ecological divergence with coevolution of niche preference

2019 ◽  
Author(s):  
Pavel Payne ◽  
Jitka Polechová
Keyword(s):  
Genetic Variation ◽  
Gene Flow ◽  
Assortative Mating ◽  
Parameter Space ◽  
Sympatric Speciation ◽  
Secondary Contact ◽  
Disruptive Selection ◽  
Ecological Divergence ◽  
Trade Off ◽  
Speciation Process

AbstractReinforcement, the increase of assortative mating driven by selection against unfit hybrids, is conditional on pre-existing divergence. Yet, for ecological divergence to precede the evolution of assortment, strict symmetries between fitnesses in niches must hold, and/or there must be low gene flow between the nascent species. It has thus been argued that conditions favouring sympatric speciation are rarely met in nature. Indeed, we show that under disruptive selection, violating symmetries in niche sizes and increasing strength of the trade-off in selection between the niches quickly leads to loss of genetic variation, instead of evolution of specialists. The region of the parameter space where polymorphism is maintained further narrows with increasing number of loci encoding the diverging trait and the rate of recombination between them. Yet, evolvable assortment and pre-existing assortment both substantially broaden the parameter space within which polymorphism is maintained. Notably, pre-existing niche preference speeds up further increase of assortment, thus facilitating reinforcement in the later phases of speciation. We conclude that in order for sympatric ecological divergence to occur, niche preference must co-evolve throughout the divergence process. Even if populations come into secondary contact, having diverged in isolation, niche preference substantially broadens the conditions for coexistence in sympatry and completion of the speciation process.

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