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Widespread genomic divergence during sympatric speciation
- A. Michel, S. Sim, T. Powell, Michael S. Taylor, P. Nosil, J. Feder
- BiologyProceedings of the National Academy of Sciences
- 10 May 2010
Results highlight how the individual genes driving speciation can be embedded within an actively diverging genome, and illustrate how these continents can exhibit variable topography, depending on selection strength, availability of preexisting genetic variation, linkage relationships, and genomic features that reduce recombination.
Sequential Sympatric Speciation Across Trophic Levels
It is reported that the parasitic wasp Diachasma alloeum has formed new incipient species as a result of specializing on diversifying fly hosts, including the recently derived apple-infesting race of R. pomonella.
Experimental evidence of genome‐wide impact of ecological selection during early stages of speciation‐with‐gene‐flow
A striking genome‐wide similarity between experimental and natural populations of R. pomonella underscores the importance of ecological selection at early stages of divergence and calls for further integration of studies of eco‐evolutionary dynamics and genome divergence.
Sequential divergence and the multiplicative origin of community diversity
Host-related ecological selection pressures that differentially adapt and reproductively isolate Rhagoletis to their respective host plants cascade through the ecosystem and induce host-associated genetic divergence for each of the three members of the parasitoid community.
ADAPTIVE CHROMOSOMAL DIVERGENCE DRIVEN BY MIXED GEOGRAPHIC MODE OF EVOLUTION
- J. Feder, Richard Gejji, T. Powell, P. Nosil
- BiologyEvolution; international journal of organic…
- 1 August 2011
This model can account for several classic patterns in the geographic distribution of inversions and highlights how selection on standing genetic variation allows rapid chromosomal evolution without the waiting time for new mutations.
GENETIC DIVERGENCE ALONG THE SPECIATION CONTINUUM: THE TRANSITION FROM HOST RACE TO SPECIES IN RHAGOLETIS (DIPTERA: TEPHRITIDAE)
The results imply that Rhagoletis sibling species such as the flowering dogwood fly represent host races writ large, with the transition to species status primarily resulting from increased divergence of the same regions separating apple and hawthorn flies.
Insights from community ecology into the role of enemy release in causing invasion success: the importance of native enemy effects
It is suggested that species that are subject to strong enemy effects in their native range will have a high potential for enemy release, and it was found that native enemy effects were stronger in aquatic systems than in terrestrial systems.
Ecological adaptation and reproductive isolation in sympatry: genetic and phenotypic evidence for native host races of Rhagoletis pomonella
Evidence is reported from microsatellite population surveys and eclosion studies supporting the existence of genetically differentiated and partially reproductively isolated host races of southern hawthorn flies that imply that speciation with gene flow may be commonly initiated in Rhagoletis when ecological opportunity presents itself.
Hybridization and the spread of the apple maggot fly, Rhagoletis pomonella (Diptera: Tephritidae), in the northwestern United States
Whether hybridization between the native snowberry‐infesting fruit fly Rhagoletis zephyria (Snow) and the introduced quarantine pest R. pomonella (Walsh) is occurring and may aid the spread of the latter into more arid commercial apple‐growing regions of central Washington state, USA is examined.
The diapause response of Rhagoletis pomonella to varying environmental conditions and its significance for geographic and host plant‐related adaptation
A hypothesis that involves physiological factors related to stored energy reserves in pupae that influences the depth and duration of Rhagoletis diapause is presented and can account for the findings and help clarify the role host plant‐related life history adaptation plays in phytophage biodiversity.