Is premating isolation inDrosophila overestimated due to uncontrolled factors?

Casares, P.; Piñeiro, R.; Carracedo, Maria C.

doi:10.1007/bf02715796

Cited by 5 publications

(3 citation statements)

References 37 publications

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“…They noted a problem when multiple-choice experiments continue so long that flies of all genotypes are not available for mating. They recommend that observations be discontinued when either 50% of potential matings have occurred, or after 30 min (see also Casares et al 2005). Many of the matings between the subspecies in our experiment occurred after the first half of matings, but before 30 min, so we chose to base statistical analyzes on data for 30 min of observation.…”

Section: Observations Of Matingsmentioning

confidence: 98%

Sexual isolation between North American and Bogota strains of Drosophila pseudoobscura

et al. 2011

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Sexual isolation, the reduced ability of organisms of different species to successfully mate, is one of the reproductive barriers that prevent gene flow between different taxa. Various species-specific signals during courtship are attributed to the sexual isolation between them. Drosophila pseudoobscura has been widely used to study the behavioral and genetic mechanisms underlying selection for sexual isolation, as a model system for speciation. D. pseudoobscura and its sibling species, D. persmilis, live together in many locations but are reproductively isolated from one another. North American geographic strains of D. pseudoobscura from the American West mate at random. Several decades ago, D. pseudoobscura was collected in the vicinity of Bogota, Colombia, and later named the subspecies D. pseudoobscura bogotana. Nearly 5,000 matings were observed in this study. We analyzed mating behavior and cuticular hydrocarbon profiles as well as courtship within and between North American and Bogota strains of D. pseudoobscura. Here we report for the first time that Bogota strains of D. pseudoobscura do show statistically significant sexual isolation from North American strains. In addition, there are quantitative variations in cuticular hydrocarbons as well as in courtship behavior between Bogota and North American strains, and females of both North American and Bogota strains show strong preference for North American strain males having high mating propensities, suggesting that the Bogota strains are at an early stage that could lead to a separate species.

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Section: Observations Of Matingsmentioning

confidence: 98%

Sexual isolation between North American and Bogota strains of Drosophila pseudoobscura

et al. 2011

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“…Ryan & Rand 1993;Gupta & Sundaran 1994;Wade et al 1995;Coyne et al 2005). The respective advantages and disadvantages of choice versus no-choice mating experiments are still a matter of debate (see Casares et al 2005;Noor & Ortiz-Barrientos 2006). While it has been argued that the design of choice experiments is more realistic than that of no-choice experiments (Spieth & Ringo 1983;Alipaz et al 2005a, b), Coyne et al (2005) suggested that when Drosophila of different strains or species congregate, the flies could evaluate potential mates individually and sequentially reject unfavourable partners.…”

Section: Discussion Male Ability To Use Pheromones To Discriminate Pomentioning

confidence: 99%

Is mate choice in Drosophila males guided by olfactory or gustatory pheromones?

2010

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Drosophila melanogaster flies use both olfactory and taste systems to detect sex pheromones and select the most suitable mate for reproduction. In nature, flies often face multiple potential partners and should have an acute sensory ability to discriminate between different pheromonal bouquets. We investigated both the pheromones and the chemosensory neurons influencing Drosophila mate choice. We measured various courtship traits in single tester males simultaneously presented with two target male and/or female flies carrying different pheromonal bouquets (pairs of control flies of the same or different sex, same-sex target pairs of pheromonal variant strains). The courtship traits reflected the perception of either olfactory cues perceived before or gustatory cues perceived after the first physical taste contact. Our results suggest that male mate choice exists in D. melanogaster and that male discrimination between potential mates could be a two-step process involving chemical cues perceived before and after the first gustatory contact. In addition, when a male was simultaneously presented with two potential sexual partners, the olfactory and gustatory cues he used depended on the pheromonal patterns of both flies, but his response could also depend on additional effects resulting from the simultaneous perception of the two flies, leading to a nonlinear choice of a sexual partner. Moreover, some tester males with genetically altered gustatory receptor neurons strongly changed their partner preference, indicating that the fly's peripheral nervous system is essential for pheromonal detection and mate choice

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“…Females mated only once during our observations, and copulations lasted~25 min. Following the established protocol (Casares et al 1998(Casares et al , 2005, we limited statistical analyses to the first 12 matings if more than 12 matings occurred within 1 h because matings would be underestimated if flies become less available after 50% individuals of the population had already mated (Casares et al 1998).…”

Section: Observations Of Matingsmentioning

confidence: 99%

Evidence for no sexual isolation between Drosophila albomicans and D. nasuta

Kim¹,

Phillips

Tao

2013

Ecology and Evolution

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Sexual isolation, the reduced tendency to mate, is one of the reproductive barriers that prevent gene flow between different species. Various species-specific signals during courtship contribute to sexual isolation between species. Drosophila albomicans and D. nasuta are closely related species of the nasuta subgroup within the Drosophila immigrans group and are distributed in allopatry. We analyzed mating behavior and courtship as well as cuticular hydrocarbon profiles within and between species. Here, we report that these two species randomly mated with each other. We did not observe any sexual isolation between species or between strains within species by multiple-choice tests. Significant difference in the courtship index was detected between these two species, but males and females of both species showed no discrimination against heterospecific partners. Significant quantitative variations in cuticular hydrocarbons between these two species were also found, but the cuticular hydrocarbons appear to play a negligible role in both courtship and sexual isolation between these two species. In contrast to the evident postzygotic isolation, the lack of sexual isolation between these two species suggests that the evolution of premating isolation may lag behind that of the intergenomic incompatibility, which might be driven by intragenomic conflicts.

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Is premating isolation inDrosophila overestimated due to uncontrolled factors?

Cited by 5 publications

References 37 publications

Sexual isolation between North American and Bogota strains of Drosophila pseudoobscura

Sexual isolation between North American and Bogota strains of Drosophila pseudoobscura

Is mate choice in Drosophila males guided by olfactory or gustatory pheromones?

Evidence for no sexual isolation between Drosophila albomicans and D. nasuta

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