Marked interspecific differences in the neuroanatomy of the male olfactory system of honey bees (genus <i>Apis</i>)

Bastin, Florian; Couto, Antoine; Larcher, Virginie; Phiancharoen, Mananya; Koeniger, Gudrun; Kœniger, N.; Sandoz, Jean‐Christophe

doi:10.1002/cne.24513

Cited by 11 publications

(14 citation statements)

References 108 publications

(167 reference statements)

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“…MGs are therefore classic examples of how neuropil size reflects functional performance, as variation in their volume is generally associated with variation in sensitivity to their corresponding odour (Gronenberg and Hölldobler, 1999; El Jundi et al 2009b; Warner et al 2007; Miura et al 2009). Furthermore, MGC structure and composition is variable across closely related species, suggesting they may co-evolve adaptively with species specific ecological and behavioural traits (Kondoh et al 2003; Namiki et al 2014; Bastin et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Re-emergence and diversification of a specialised antennal lobe morphology in ithomiine butterflies

Morris

Couto

Aldin³

et al. 2020

Preprint

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How an organisms sensory system functions is central to how it navigates its environment and meets the behavioural challenges associated with survival and reproduction. Comparing sensory systems across species can reveal how facets of behaviour and ecology promote adaptive shifts in the relative importance of certain environmental cues. The insect olfactory system is prominent model for investigating how ecological factors impact sensory reception and processing. Notably work in Lepidoptera led to the discovery of vastly expanded structures, termed a macroglomerular complex (MGC), within the primary olfactory processing centre. These structures typically process pheromonal cues and provide a classic example of how variation in size can influence the functional processing of sensory cues. Though prevalent across moths, the MGC was lost during the early evolution of butterflies, consistent with evidence that courtship initiation in butterflies is primarily reliant upon visual cues, rather than long distance olfactory signals like pheromones. However, a MGC has recently been reported to be present in a species of ithomiine, Godryis zavaleta, suggesting this once lost neural adaptation has re-emerged in this clade. Here, we show that MGCs, or MGC-like morphologies, are indeed widely distributed across the ithomiine tribe, and vary in both structure and the prevalence of sexual dimorphism. Based on patterns of variation across species with different chemical ecologies, we suggest that this structure is involved in the processing of both plant and pheromonal cues, of interlinked chemical constitution, and has evolved in conjunction with the increased importance and diversification of plant derived chemicals cues in ithomiines.

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Section: Introductionmentioning

confidence: 99%

Re-emergence and diversification of a specialised antennal lobe morphology in ithomiine butterflies

Morris

Couto

Aldin³

et al. 2020

Preprint

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“…In addition, Tamura et al [38] reported that (E)-3-decenol and (Z)-3-decenol are separated by 6 and 25 KI units on an non-polar and polar column, respectively. The (Z)-3-decenol standard had a KI (semi polar: 1255, polar: 1788) and mass spectrum (55 (100), 67 (73), 68 (83), 81 (57), 82 (35), 95 (23), 96 (21)) that was similar to the large second chromatographic peak found in male samples (KI semi polar 1257 ±1; polar 1792 ± 1; mass spectrum: 55 (100), 67 (73), 68 (85), 81 (57), 82 (34), 95 (22), 96 (17)).…”

Section: Plos Onementioning

confidence: 99%

“…Different antennal response amplitudes were shown to be linked to glomeruli size, and are typically linked to specific olfactory receptors [72]. Sexually dimorphic enlarged glomeruli are typically linked to pheromone processing [73][74][75]. For example, the processing of the queen pheromone in the honeybee was linked to enlarged glomeruli in males [73].…”

Section: Plos Onementioning

confidence: 99%

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Biology of a putative male aggregation-sex pheromone in Sirex noctilio (Hymenoptera: Siricidae)

et al. 2020

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A putative male-produced pheromone has recently been described for the global pest of pines, Sirex noctilio, but field-activity has not been demonstrated. This study aimed to investigate the pheromone biology of S. noctilio in more detail. Specifically, we i) analysed effluvia and extracts for additional compounds by gas chromatography coupled with electro-antennographic detection (GC-EAD), mass spectrometry (GC-MS) and two dimensional time of flight mass spectrometry (GC X GC TOF MS), ii) conducted dose-response experiments for putative pheromone components, iii) determined the site of synthesis/ storage of the putative pheromone and iv) determined the release rate of the putative pheromone from males and three types of lures. A blend of four compounds was identified, including the previously described (Z)-3-decenol and (Z)-4-decenol, and two new compounds (Z)-3-octenol and (Z)-3-dodecenol. All compounds elicited a response from both male and female antennae, but the strength of the response varied according to sex, compound and dose tested. (Z)-3-Decenol and (Z)-3-octenol at lower and higher doses, respectively, elicited larger responses in males and females than the other two compounds. (Z)-3-Octenol and (Z)-4-decenol generally elicited larger female than male antennal responses. The site of synthesis and/or storage in males was determined to be the hind legs, likely in the leg-tendon gland. The relative release rate of the major compound by male wasps was shown to be 90 ± 12.4 ng/min, which is between 4 and 15 times greater than that observed from typical lures used previously. These observations are consistent with the hypothesis that these compounds may mediate lek formation in S. noctilio males and lek location in females.

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“…This structure is made of morphological and functional units called glomeruli, which individually gather inputs from a given type of OSN 28 – 30 . Recently, an increased effort has been made to describe and compare antennal lobe organization across species in Diptera 31 – 34 , Coleoptera 35 – 38 , Lepidoptera 39 – 44 and Hymenoptera 45 – 51 . The AL of social Hymenoptera stands out as particularly complex as it contains a high number of glomeruli, compartmentalized in clusters formed by distinct bundles of OSN axons 52 – 56 .…”

Section: Introductionmentioning

confidence: 99%

Interspecific variation of antennal lobe composition among four hornet species

Couto

Arnold

et al. 2021

Sci Rep

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Olfaction is a crucial sensory modality underlying foraging, social and mating behaviors in many insects. Since the olfactory system is at the interface between the animal and its environment, it receives strong evolutionary pressures that promote neuronal adaptations and phenotypic variations across species. Hornets are large eusocial predatory wasps with a highly developed olfactory system, critical for foraging and intra-specific communication. In their natural range, hornet species display contrasting ecologies and olfactory-based behaviors, which might match to adaptive shifts in their olfactory system. The first olfactory processing center of the insect brain, the antennal lobe, is made of morphological and functional units called glomeruli. Using fluorescent staining, confocal microscopy and 3D reconstructions, we compared antennal lobe structure, glomerular numbers and volumes in four hornet species (Vespa crabro, Vespa velutina, Vespa mandarinia and Vespa orientalis) with marked differences in nesting site preferences and predatory behaviors. Despite a conserved organization of their antennal lobe compartments, glomeruli numbers varied strongly between species, including in a subsystem thought to process intraspecific cuticular signals. Moreover, specific adaptations involving enlarged glomeruli appeared in two species, V. crabro and V. mandarinia, but not in the others. We discuss the possible function of these adaptations based on species-specific behavioral differences.

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Marked interspecific differences in the neuroanatomy of the male olfactory system of honey bees (genus Apis)

Cited by 11 publications

References 108 publications

Re-emergence and diversification of a specialised antennal lobe morphology in ithomiine butterflies

Re-emergence and diversification of a specialised antennal lobe morphology in ithomiine butterflies

Biology of a putative male aggregation-sex pheromone in Sirex noctilio (Hymenoptera: Siricidae)

Interspecific variation of antennal lobe composition among four hornet species

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