Assortative Mating in Drosophila Adapted to a Microsite Ecological Gradient

Singh, Shree Ram; Rashkovetsky, Eugenia; Iliadi, Konstantin G.; Nevo, Eviatar; Korol, Abraham B.

doi:10.1007/s10519-005-6119-2

Cited by 27 publications

(34 citation statements)

References 63 publications

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“…The most exciting findings on EC flies come from sexual behavior experiments indicating that the EC population cannot be considered panmictic. These findings include positive assortative mating (22,43), interslope differences in mating propensity, sexual discrimination and reproductive behavior (39), and slope specificity in the courtship song pattern (K.I., unpublished data). Some discrepant and controversial data on nonrandom mating in EC flies were also obtained (see below) inspiring further investigations.…”

Section: Resultsmentioning

confidence: 98%

“…Some peculiarities in the procedure that could affect the results should be noted. In our tests (22,39,43,45), flies were observed until Ϸ50-60% of the maximal number of couples were formed to avoid a nonchoice situation, unlike the protocol of T. Panhuis et al (44) where mating pairs were aspirated until a maximum of 50 pairs were collected (more than 78% of the maximal couples number), or 1 hr had passed from the beginning of test. Recent experiments for premating isolation in flies from EC, conducted in two laboratories (Simon Fraser University, Burnaby, Canada, and University of Haifa, Haifa, Israel), under a variety of protocols, detected significant assortative mating in three of six single choice tests in Burnaby, suggesting that the populations are behaviorally differentiated in some manner (45).…”

Section: Resultsmentioning

confidence: 99%

“…Further experiments were undertaken with fresh collections of D. melanogaster and D. simulans (43). Significant deviation from random mating was found in both female-choice and malechoice tests in the majority of crosses of lines from both slopes and in both spring and fall collections.…”

Section: Resultsmentioning

confidence: 99%

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Drosophila flies in “Evolution Canyon” as a model for incipient sympatric speciation

Korol

Rashkovetsky

Iliadi

et al. 2006

Proc. Natl. Acad. Sci. U.S.A.

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The genetic basis of population divergence leading to adaptive radiation and speciation is a major unresolved problem of evolutionary biology. Molecular elucidation of ''speciation genes'' advanced recently, yet it remains without clear identification of the gene complexes participating in reproductive isolation between natural populations, particularly, in sympatry. Genetic divergence was discovered between Drosophila melanogaster populations inhabiting ecologically contrasting, opposite slopes in ''Evolution Canyon'' (EC), Mt. Carmel, Israel. Interslope migration of flies is easy and verified. Nevertheless, significant interslope D. melanogaster population divergence was established at EC involving habitat choice, mate choice, thermal and drought tolerances, adaptive genes, and mobile elements. Parallel patterns of stress tolerance, habitat choice, and mate choice were demonstrated in Drosophila simulans at EC, although on a smaller scale. However, some tests for interslope genetic differentiation in Drosophila, derived from the opposite EC slopes, gave somewhat controversial results. Here we present new empirical data on interslope genetic divergence of Drosophila at EC, and summarize previous supporting and controversial results. We suggest that Drosophila populations at EC represent a rare example, demonstrating how selection overrides migration, and propose an ad hoc ecological model of incipient sympatric divergence.genetic divergence ͉ incipient differentiation ͉ natural populations ͉ sympatric evolution

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

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Drosophila flies in “Evolution Canyon” as a model for incipient sympatric speciation

Korol

Rashkovetsky

Iliadi

et al. 2006

Proc. Natl. Acad. Sci. U.S.A.

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“…If a colonizing species such as Z. tuberculatus succeeded to evolve significant interslope allozymic diversity in about 30 or more years, it could also evolve mate choice, which is directly dependent on habitat and resource choice, as was the case with D. melanogaster. In the latter, peculiarities in courtship song patterns and nonrandom mating (i.e., mate choice) were observed at EC, despite a very small interslope distance of 200 m (39,40). Single-and multiple-mate choice tests with Drosophila melanogaster from the opposite slopes displayed highly significant assortative mating, with a preference for slope-specific sexual partners, based on variation in courtship songs (40).…”

Section: Discussionmentioning

confidence: 96%

Sympatric incipient speciation of spiny miceAcomysat “Evolution Canyon,” Israel

Hadid

Pavlı́ček

Beiles

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

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Does the paucity of empirical evidence of sympatric speciation in nature reflect reality, despite theoretical support? Or is it due to inappropriate searches in nature with overly restrictive assumptions and an incorrect null hypothesis? Spiny mice, Acomys, described here at Evolution Canyon (EC) incipiently and sympatrically speciate owing to microclimatic interslope divergence. The opposite slopes at EC vary dramatically, physically and biotically, representing the dry and hot south-facing slope savannoid-African continent ["African" slope (AS)], abutting with the north-facing slope forested south-European continent ["European" slope (ES)]. African-originated spiny mice, of the Acomys cahirinus complex, colonized Israel 30,000 y ago based on fossils. Genotypically, we showed significantly higher genetic diversity of mtDNA and amplified fragment length polymorphism of Acomys on the AS compared with the ES. This is also true regionally across Israel. In complete mtDNA, 25% of the haplotypes at EC were slope-biased. Phenotypically, the opposite slope's populations also showed adaptive morphology, physiology, and behavior divergence paralleling regional populations across Israel. Preliminary tests indicate slope-specific mate choices. Colonization of Acomys at the EC first occurred on the AS and then moved to the ES. Strong slopespecific natural selection (both positive and negative) overrules low interslope gene flow. Both habitat slope selection and mate choices suggest ongoing incipient sympatric speciation. We conclude that Acomys at the EC is ecologically and genetically adaptively, incipiently, sympatrically speciating on the ES owing to adaptive microclimatic natural selection.ecological-speciation | adaptation | microscale | rodents C an mammals speciate sympatrically (i.e., the origin of a new species within a freely interbreeding population) without geographic isolation (1)? We have recently argued that blind subterranean mole rats, Spalax, possibly display incipient sympatric ecological speciation within the range of Spalax galili (2n = 52) in

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“…A final possible explanation of the discrepancy in the results could be that differential selection initiates the creation of alternative gene complexes (haplotypes) for loci affecting the selected traits on the two slopes, and that their maintenance in the face of gene flow/ recombination is due to selection facilitated by certain habitat choice (Nevo et al, 1998) and assortative mating Iliadi et al, 2001;Singh et al, 2005). In this scenario, adaptive differentiation can withstand the disruptive effects of migration and recombination.…”

Section: Discussionmentioning

confidence: 99%

Adaptive differentiation of thermotolerance in Drosophila along a microclimatic gradient

et al. 2006

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We examined whether a remarkable occurrence -the physiological evolution of two Drosophila melanogaster populations, despite a spatial separation of only 100-400 m, was idiosyncratic and temporary, or persisted over multiple years. We ascertained the high-temperature tolerance of Drosophila descended from populations on the north-facing slope (NFS) and south-facing slope (SFS) of 'Evolution Canyon' (Lower Nahal Oren, Mt Carmel, Israel), which were collected in 1997, 1999, and 2000. Results for these Drosophila uniformly resembled other studies in many respects: an inverse relationship between survival and heat-shock temperature, male-female differences in thermotolerance, and inducible thermotolerance. Importantly, for all years of collection, SFS flies consistently exceeded NFS flies in basal and inducible thermotolerance after diverse heat shocks, with and without thermal pretreatment, and whether isofemale lines, synthetic populations, or inbred lines were compared. Inbred lines, however, had lower thermotolerance than outbred lines. Several nonexclusive processes may explain the evolution of such physiological differentiation.

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Assortative Mating in Drosophila Adapted to a Microsite Ecological Gradient

Cited by 27 publications

References 63 publications

Drosophila flies in “Evolution Canyon” as a model for incipient sympatric speciation

Drosophila flies in “Evolution Canyon” as a model for incipient sympatric speciation

Sympatric incipient speciation of spiny miceAcomysat “Evolution Canyon,” Israel

Adaptive differentiation of thermotolerance in Drosophila along a microclimatic gradient

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