Interspecific Laboratory Competition of the Recently Sympatric Species Drosophila subobscura and Drosophila pseudoobscura

Pascual, Marta; Serra, Luı́s; Ayala, Francisco J.

doi:10.2307/2410944

Cited by 15 publications

(27 citation statements)

References 13 publications

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“…Similar observations have been interpreted as adaptations that evolved as a consequence of specialization in host use in other species (Bonner & Horn, 1982;Sevenster & van Alphen, 1993;Breitmeyer & Markov, 1998;Pascual et al, 1998;Morris, 1999). A shorter DT may represent an adaptive advantage because a decrease in generation time (Sevenster & van Alphen, 1993) enhances the optimal use of an ephemeral resource like a rapidly decomposing substrate as prickly pear (Fanara et al, 1999); it also reduces larval mortality by the avoidance of long periods of larval competition (Pimm et al, 1985;Krebs & Barker, 1991;Pascual et al, 1998;Morris, 1999). According to our results, only D. buzzatii satisfies this prediction as LV and fast development were maximized and accompanied by a larger wing size in its natural preferred host (O. sulphurea).…”

Section: Discussionmentioning

confidence: 54%

“…Moreover, it has been proposed that O. sulphurea and T. terschekii also differ, as breeding sites for the flies, in other features that may be ecologically relevant such as spatial and temporal predictability (Fanara et al, 1999). Similar observations have been interpreted as adaptations that evolved as a consequence of specialization in host use in other species (Bonner & Horn, 1982;Sevenster & van Alphen, 1993;Breitmeyer & Markov, 1998;Pascual et al, 1998;Morris, 1999). Similar observations have been interpreted as adaptations that evolved as a consequence of specialization in host use in other species (Bonner & Horn, 1982;Sevenster & van Alphen, 1993;Breitmeyer & Markov, 1998;Pascual et al, 1998;Morris, 1999).…”

Section: Discussionmentioning

confidence: 97%

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Host‐related life history traits in interspecific hybrids of cactophilicDrosophila

Soto¹,

Soto

Carreira

et al. 2007

Entomologia Exp Applicata

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In the genus Drosophila (Diptera: Drosophilidae), interspecific hybridization is a rare phenomenon. However, recent evidence suggests a certain degree of introgression between the cactophilic siblings Drosophila buzzatii Patterson & Wheeler and Drosophila koepferae Fontdevila & Wasserman. In this article, we analyzed larval viability and developmental time of hybrids between males of D. buzzatii and females of D. koepferae , raised in media prepared with fermenting tissues of natural host plants that these species utilize in nature as breeding sites. In all cases, developmental time and larval viability in hybrids was not significantly different from parental lines and, depending on the cross, hybrids developed faster than both parental species or than the slowest species. When data of wing length were included in a discriminant function analysis, we observed that both species can be clearly differentiated, while hybrids fell in two categories, one intermediate between parental species and the other consisting of extreme phenotypes. Thus, our results point out that hybrid fitness, as measured by developmental time and viability, is not lower than in the parental species.

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Section: Discussionmentioning

confidence: 54%

Section: Discussionmentioning

confidence: 97%

Host‐related life history traits in interspecific hybrids of cactophilicDrosophila

Soto¹,

Soto

Carreira

et al. 2007

Entomologia Exp Applicata

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“…On the other hand, other species of the obscura group are present in North America. Laboratory experiments demonstrated that these species could act as competitors (Pascual et al . 1998), and therefore could slow down the rate of expansion as well as affect the evolution of adaptive traits (Gilchrist et al .…”

Section: Discussionmentioning

confidence: 99%

Introduction history of Drosophila subobscura in the New World: a microsatellite‐based survey using ABC methods

Pascual¹,

Chapuis²,

Mestres³

et al. 2007

Molecular Ecology

148

187

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Drosophila subobscura is a Palearctic species that was first observed in South and North America in the early 1980s, and that rapidly invaded broad latitudinal ranges on both continents. To trace the source and history of this invasion, we obtained genotypic data on nine microsatellite loci from two South American, two North American and five European populations of D. subobscura. We analysed these data with traditional statistics as well as with an approximate Bayesian computation (ABC) framework. ABC methods yielded the strongest support for the scenario involving a serial introduction with founder events from Europe into South America, and then from South America into North America. Stable effective population size of the source population was very large (around one million individuals), and the propagule size was notably smaller for the introduction into South America (i.e. high bottleneck severity index with only a few effective founders) but considerably larger for the subsequent introduction into North America (i.e. low bottleneck severity index with around 100-150 effective founders). Finally, the Mediterranean region of Europe (and most likely Barcelona from the localities so far analysed) is proposed as the source of the New World flies, based on mean individual assignment statistics.

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“…Thus, the present results suggest that interspecific interaction of drosophilid larvae is basically competitive, but could be weak because significant effects were observed only when individuals of co‐introduced species were numerous. There have also been several studies that detect interspecific competition of drosophilid larvae (Miller 1964, Orengo and Prevosti 1994, Pascual et al 1998, 2000, Krijger et al 2001, Fanara et al 2004). Hodges et al (1999) observed indirect facilitation between D. melanogaster and D. hydei through a reduction of the surface cover of mold on a resource patch.…”

Section: Discussionmentioning

confidence: 99%

“…Interaction of drosophilid larvae, whether intraspecific or interspecific, has usually been reported to be competitive, leading to reduction of survivorship, growth and/or reproduction of competing individuals in a density dependent manner (Bakker 1961, Miller 1964, Worthen et al 1993, Orengo and Prevosti 1994, Shorrocks and Bingley 1994, Joshi and Mueller 1996, Jones et al 1996, Pascual et al 1998, 2000, Krijger et al 2001, Hoffmeister and Rohlfs 2001, Wertheim et al 2002, Fanara et al 2004). However, Rohlfs and Hoffmeister (2003) observed a hump‐shaped relationship between egg density and individual survival probability (i.e.…”

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confidence: 99%

Intraspecific and interspecific larval interaction in Drosophila assessed by integrated fitness measure

Takahashi

Kimura

2005

Oikos

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Intraspecific density effect was investigated for D. simulans, D. suzukii, D. auraria, D. rufa and D. immigrans, and interspecific density effect was examined for combinations of D. simulans, D. rufa and D. immigrans. Different numbers of their eggs were introduced to artificial substrates, and intra‐ and interspecific interaction were evaluated on the basis of per capita egg production of individuals (eggs) introduced. If individuals died before pupation, their per capita egg production was zero; if individuals survived to pupae, their per capita egg production was estimated from their size based on the relation between the pupal size and lifetime egg production. Per capita egg production thus estimated generally decreased with the increase of the density of conspecific larvae, although a slight increase was detected at high densities in some cases. When two species were introduced, per capita egg production of a species was reduced only when the larval density of co‐introduced species was very high, suggesting weak interspecific competition. Interspecific interaction was asymmetric; the effect of D. simulans on D. rufa and D. immigrans was often significantly negative, but the effect of D. rufa or D. immigrans on D. simulans was not significant.

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Interspecific Laboratory Competition of the Recently Sympatric Species Drosophila subobscura and Drosophila pseudoobscura

Abstract: Genetics of reproductive isolation in the Drosophila simulans clade: DNA marker-assisted mapping and characterization of a hybrid-male sterility gene, Odysseus (Ods). Genetics 133:261-275.

Cited by 15 publications

References 13 publications

Host‐related life history traits in interspecific hybrids of cactophilicDrosophila

Host‐related life history traits in interspecific hybrids of cactophilicDrosophila

Introduction history of Drosophila subobscura in the New World: a microsatellite‐based survey using ABC methods

Intraspecific and interspecific larval interaction in Drosophila assessed by integrated fitness measure

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