Alternative Routes to the Evolution of Competitive Ability in Two Competing Species of Drosophila

Joshi, Amitabh; Thompson, John N.

doi:10.2307/2410315

Cited by 28 publications

(46 citation statements)

References 29 publications

(41 reference statements)

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“…In our experiment, there were significant interactions involving population only for interspecific competition and the magnitudes of competitive effect and response were uncorrelated among A. albopictus populations. Competitive effect and response are at least partially independent for plants and invertebrates (e.g., Goldberg and Fleetwood 1987, Joshi and Thompson 1995, Byers 2000). Thus, independent evolution of enhanced effect or response among populations of a wide ranging species, such as A. albopictus , seems possible.…”

Section: Discussionmentioning

confidence: 99%

Interpopulation divergence in competitive interactions of the mosquitoAedes albopictus

Leisnham

Lounibos

O'Meara

et al. 2009

Ecology

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Geographic variation in species interactions can have major effects on distributions. Effects of such variation can be particularly evident for invasive species, in which variation in competitive ability can influence invasive success and impacts. We tested the hypothesis that coexistence or exclusion of the resident mosquito Aedes aegypti results from variation among local populations of the invasive Aedes albopictus in competitive interactions with A. aegypti. We also examined the role of variation in fecundity-size relationship in these competitive interactions. We compared competitive abilities of nine North American populations of A. albopictus, three populations from each of three site types: extinction of A. aegypti following A. albopictus invasion, coexistence following A. albopictus invasion, and A. albopictus allopatric to A. aegypti. Competition among larvae from each A. albopictus population and a single A. aegypti population was tested in laboratory microcosms in a response-surface design. We found interpopulation differences in competitive ability of A. albopictus, but no strong patterns among site types. Extinction sites had steeper average fecundity-size relationships than coexistence sites and allopatric sites, but this did not translate into superior population performance. Certain individual A. albopictus populations had exceptionally large competitive effects on A. aegypti or poor competitive responses to competition from A. aegypti, but competitive effect and response were not correlated. These results suggest that interpopulation variation in the competitive ability of A. albopictus may only partly explain geographic pattern of coexistence with or extinction of A. aegypti. Environmental differences among regions may affect the competitive ability of A. albopictus and influence its invasion success and impact.

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Section: Discussionmentioning

confidence: 99%

Interpopulation divergence in competitive interactions of the mosquitoAedes albopictus

Leisnham

Lounibos

O'Meara

et al. 2009

Ecology

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“…Perhaps, even more intriguing is the possibility of different morphological, physiological, or behavioral pathways leading to the same selection response. Examples in this category include selection on competitive ability in Drosophila (Joshi and Thompson 1995), growth rate patterns in mice (Rhees and Atchley 2000), wheel running in mice (Garland et al 2002), and adaptive evolution to growth media in Escherichia coli (Fong et al 2005). Different pathways to the same phenotype have also been found in natural populations of D. subobscura.…”

Section: What Is the Importance To Quantitative Genetics Of Identifyimentioning

confidence: 99%

A Centennial Celebration for Quantitative Genetics

2007

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“…Furthermore, within‐species variation in exploitative abilities or in investment in interference mechanisms may shift the outcome of competition between two competing species (Park et al 1964). If these abilities trade‐off, or if resistance to the negative impacts of competition evolves, then competitive interactions themselves may maintain variation within each species and facilitate species coexistence (Joshi and Thompson 1995; Lankau and Strauss 2007; Lankau 2008).…”

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confidence: 99%

Alternative Paths to Success in a Parasite Community: Within-Host Competition Can Favor Higher Virulence or Direct Interference

2012

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Selection imposed by coinfection may vary with the mechanism of within-host competition between parasites. Exploitative competition is predicted to favor more virulent parasites, whereas interference competition may result in lower virulence. Here, we examine whether exploitative or interference competition determines the outcome of competition between two nematode species (Steinernema spp.), which in combination with their bacterial symbionts (Xenorhabdus spp.), infect and kill insect hosts.Multiple isolates of each nematode species, carrying their naturally associated bacteria, were characterized by (1) the rate at which they killed insect hosts, and by (2) the ability of their bacteria to interfere with each other's growth via bacteriocidal toxins called "bacteriocins." We found that both exploitative and interference abilities were important in predicting which species had a selective advantage in pairwise competition experiments. When nematodes carried bacteria that did not interact via bacteriocins, the faster killing isolate had a competitive advantage. Alternatively, nematodes could gain a competitive advantage when they carried bacteria able to inhibit the bacteria of their competitor. Thus, the combination of nematode/bacterial traits that led to competitive success depended on which isolates were paired, suggesting that variation in competitive interactions may be important for maintaining species diversity in this community.

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Alternative Routes to the Evolution of Competitive Ability in Two Competing Species of Drosophila

Cited by 28 publications

References 29 publications

Interpopulation divergence in competitive interactions of the mosquitoAedes albopictus

Interpopulation divergence in competitive interactions of the mosquitoAedes albopictus

A Centennial Celebration for Quantitative Genetics

Alternative Paths to Success in a Parasite Community: Within-Host Competition Can Favor Higher Virulence or Direct Interference

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