Premating Isolation Is Determined by Larval Rearing Substrates in Cactophilic Drosophila mojavensis. IV. Correlated Responses in Behavioral Isolation to Artificial Selection on a Life‐History Trait

@article{Etges1998PrematingII,
  title={Premating Isolation Is Determined by Larval Rearing Substrates in Cactophilic Drosophila mojavensis. IV. Correlated Responses in Behavioral Isolation to Artificial Selection on a Life‐History Trait},
  author={William J. Etges},
  journal={The American Naturalist},
  year={1998},
  volume={152},
  pages={129 - 144}
}
  • W. Etges
  • Published 1 July 1998
  • Biology
  • The American Naturalist
Studies of behavioral isolation among geographically isolated populations of Drosophila mojavensis have provided an understanding of incipient speciation wherein phylogeny and ecology play a prominent role. Populations of D. mojavensis in mainland Mexico and southern Arizona exhibit low but significant premating isolation from Baja California populations in laboratory mate choice tests. These same populations have undergone considerable life‐history evolution in response to use of different… 

GENETICS OF INCIPIENT SPECIATION IN DROSOPHILA MOJAVENSIS. III. LIFE‐HISTORY DIVERGENCE IN ALLOPATRY AND REPRODUCTIVE ISOLATION

The regional shifts in life histories that evolved once D. mojavensis invaded mainland Mexico from Baja California by shifting host plants were genetically correlated with variation in cuticular hydrocarbon‐based mate preferences.

Premating Isolation Is Determined by Larval‐Rearing Substrates in Cactophilic Drosophila mojavensis. V. Deep Geographic Variation in Epicuticular Hydrocarbons among Isolated Populations*

Regional variation in epicuticular hydrocarbon profiles suggests that these hydrocarbon differences have also evolved in D. mojavensis since this species invaded mainland Sonora and Sinaloa from Baja California by switching host plants, in addition to a number of key genetic, behavioral, and life‐history characters.

Premating isolation is determined by larval rearing substrates in cactophilic Drosophila mojavensis. X. Age-specific dynamics of adult epicuticular hydrocarbon expression in response to different host plants

Assessment of expression of contact pheromones comprised of epicuticular hydrocarbons from eclosion to 28 days of age in adults from two populations reared on fermenting tissues of two host cacti over the entire life cycle found variations in CHC composition required information about population and host plant differences.

GENETICS OF INCIPIENT SPECIATION IN DROSOPHILA MOJAVENSIS. I. MALE COURTSHIP SONG, MATING SUCCESS, AND GENOTYPE X ENVIRONMENT INTERACTIONS

Analysis of courtship song revealed consistent effects linked with the same fourth chromosome markers that influenced time to copulation, a number of GxE interactions, and few possible cases of epistasis, so signal evolution and reproductive isolation may be slowed in diverging populations.

SPECIES HYBRIDS IN THE LABORATORY BUT NOT IN NATURE: A REANALYSIS OF PREMATING ISOLATION BETWEEN DROSOPHILA ARIZONAE AND D. MOJAVENSIS

Sympatric populations were more sexually isolated than allopatric ones, consistent with past studies, and all experimental variables tested (chamber size, host plant presence and rearing substrates) had significant effects on levels of premating isolation between these species.

Premating isolation is determined by larval rearing substrates in cactophilic Drosophila mojavensis. VIII. Mating success mediated by epicuticular hydrocarbons within and between isolated populations

Sexual isolation among populations was much stronger than sexual selection within these populations of D. mojavensis, and was mediated by epicuticular hydrocarbons (EHCs), contact pheromones in this system.

Premating isolation is determined by larval rearing substrates in cactophilic Drosophila mojavensis. IX. Host plant and population specific epicuticular hydrocarbon expression influences mate choice and sexual selection

Different groups of cuticular hydrocarbons mediated female choice‐based sexual selection in each population suggesting that geographical and ecological divergence has the potential to promote divergence in mate communication systems.

TRANSCRIPTOME‐WIDE EXPRESSION VARIATION ASSOCIATED WITH ENVIRONMENTAL PLASTICITY AND MATING SUCCESS IN CACTOPHILIC DROSOPHILA MOJAVENSIS

The results suggest that the influence of environmental variation on mating success via regulation of gene expression might be an important aspect of ecological speciation.

Host Preference Among Populations of Drosophila mojavensis (Diptera: Drosophilidae) that Use Different Host Cacti

Five geographically isolated populations of D. mojavensis from nature were sampled to assess host choice within and between populations, and each showed significant preference for agria volatiles with one exception: a mainland Sonora population that uses organ pipe cactus in nature exhibited preference for organ pipe volatile, suggesting a possible shift in host preference.

Sexual Isolation Between Drosophila mojavensis and Drosophila arizonae

Strong evidence for reproductive isolation between two strains of D. arizonae is found and the majority of the observed behavioral isolation seems to be the result of intraspecific, interpopulation encounters between females from Southeastern Mexico and males derived from the Northern population.
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