Population differences in olfaction accompany host shift in
            <i>Drosophila mojavensis</i>

Crowley-Gall, Amber; Date, Priya; Han, Clair; Rhodes, Nicole; Andolfatto, Peter; Layne, John E.; Rollmann, Stephanie M.

doi:10.1098/rspb.2016.1562

Cited by 43 publications

(52 citation statements)

References 46 publications

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“…Second, Mojave population females, in particular, had marked preferences for their own host plant, barrel cactus, when given a choice of it versus an alternative. This result is consistent with past research, suggesting that the Mojave population diverged with host shift in its genetic structure, olfactory electrophysiological and behavioral responses to cactus volatiles (Ross & Markow, ; Date et al., ; Crowley‐Gall et al., ). Finally, it is interesting that the mainland Sonoran population prefers its host, organ pipe cactus, but only when paired with barrel.…”

Section: Discussionsupporting

confidence: 92%

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Population differences in host plant preference and the importance of yeast and plant substrate to volatile composition

Date

Crowley-Gall

Diefendorf

et al. 2017

Ecology and Evolution

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Divergent selection between environments can result in changes to the behavior of an organism. In many insects, volatile compounds are a primary means by which host plants are recognized and shifts in plant availability can result in changes to host preference. Both the plant substrate and microorganisms can influence this behavior, and host plant choice can have an impact on the performance of the organism. In Drosophila mojavensis, four geographically isolated populations each use different cacti as feeding and oviposition substrates and identify those cacti by the composition of the volatile odorants emitted. Behavioral tests revealed D. mojavensis populations vary in their degree of preference for their natural host plant. Females from the Mojave population show a marked preference for their host plant, barrel cactus, relative to other cactus choices. When flies were given a choice between cacti that were not their host plant, the preference for barrel and organ pipe cactus relative to agria and prickly pear cactus was overall lower for all populations. Volatile headspace composition is influenced by the cactus substrate, microbial community, and substrate‐by‐microorganism interactions. Differences in viability, developmental time, thorax length, and dry body weight exist among populations and depend on cactus substrate and population‐by‐cactus interactions. However, no clear association between behavioral preference and performance was observed. This study highlights a complex interplay between the insect, host plant, and microbial community and the factors mediating insect host plant preference behavior.

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Section: Discussionsupporting

confidence: 92%

“…Additionally, a synthetic mixture of barrel volatiles was shown to preferentially attract flies from the Mojave population (Date et al, 2013). Population differences in olfactory sensory neuron number, sensitivity, and specificity have also been observed in this system (Crowley-Gall et al, 2016).…”

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confidence: 85%

Population differences in host plant preference and the importance of yeast and plant substrate to volatile composition

Date

Crowley-Gall

Diefendorf

et al. 2017

Ecology and Evolution

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“…For example, a comparison of D. melanogaster and Drosophila sechellia , a specialist that oviposits only on morinda fruit, revealed that D. sechellia shows enhanced attraction to a subset of morinda-derived odorants and increased abundance of the antennal neurons that respond to these odorants (Dekker et al 2006). Similar changes have been observed for other Drosophila species, mosquitos, and bees (Burger et al 2013; Crowley-Gall et al 2016; Linz et al 2013; Syed and Leal 2009). In addition to showing enhanced responses to odorants emitted by their food sources or oviposition substrates, some specialists also show reduced responses to odorants emitted by other sources.…”

Section: Discussionsupporting

confidence: 84%

Olfactory Preferences of the Parasitic Nematode Howardula aoronymphium and its Insect Host Drosophila falleni

et al. 2017

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Many parasitic nematodes have an environmental infective stage that searches for hosts. Olfaction plays an important role in this process, with nematodes navigating their environment using host-emitted and environmental olfactory cues. The interactions between parasitic nematodes and their hosts are also influenced by the olfactory behaviors of the host, since host olfactory preferences drive behaviors that may facilitate or impede parasitic infection. However, how olfaction shapes parasite-host interactions is poorly understood. Here we investigated this question using the insect-parasitic nematode Howardula aoronymphium and its host, the mushroom fly Drosophila falleni. We found that both H. aoronymphium and D. falleni are attracted to mushroom odor and a subset of mushroom-derived odorants, but they have divergent olfactory preferences that are tuned to different mushroom odorants despite their shared mushroom environment. H. aoronymphium and D. falleni respond more narrowly to odorants than Caenorhabditis elegans and Drosophila melanogaster, consistent with their more specialized niches. Infection of D. falleni with H. aoronymphium alters its olfactory preferences, rendering it more narrowly tuned to mushroom odor. Our results establish H. aoronymphium-D. falleni as a model system for studying olfaction in the context of parasite-host interactions.

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“…; Crowley‐Gall et al. ) despite much shorter divergence times than between H. melpomene and H. cydno (approximately 2.1 million years ago; Arias et al. ; Kozak et al.…”

Section: Discussionmentioning

confidence: 99%

A major locus controls a biologically active pheromone component inHeliconius melpomene

et al. 2020

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Understanding the production, response, and genetics of signals used in mate choice can inform our understanding of the evolution of both intraspecific mate choice and reproductive isolation. Sex pheromones are important for courtship and mate choice in many insects, but we know relatively little of their role in butterflies. The butterfly Heliconius melpomene uses a complex blend of wing androconial compounds during courtship. Electroantennography in H. melpomene and its close relative Heliconius cydno showed that responses to androconial extracts were not species specific. Females of both species responded equally strongly to extracts of both species, suggesting conservation of peripheral nervous system elements across the two species. Individual blend components provoked little to no response, with the exception of octadecanal, a major component of the H. melpomene blend. Supplementing octadecanal on the wings of octadecanal‐rich H. melpomene males led to an increase in the time until mating, demonstrating the bioactivity of octadecanal in Heliconius. Using quantitative trait locus (QTL) mapping, we identified a single locus on chromosome 20 responsible for 41% of the parental species’ difference in octadecanal production. This QTL does not overlap with any of the major wing color or mate choice loci, nor does it overlap with known regions of elevated or reduced FST. A set of 16 candidate fatty acid biosynthesis genes lies underneath the QTL. Pheromones in Heliconius carry information relevant for mate choice and are under simple genetic control, suggesting they could be important during speciation.

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Population differences in olfaction accompany host shift in Drosophila mojavensis

Cited by 43 publications

References 46 publications

Population differences in host plant preference and the importance of yeast and plant substrate to volatile composition

Population differences in host plant preference and the importance of yeast and plant substrate to volatile composition

Olfactory Preferences of the Parasitic Nematode Howardula aoronymphium and its Insect Host Drosophila falleni

A major locus controls a biologically active pheromone component inHeliconius melpomene

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