Coccinellids and Semiochemicals

Pettersson, Jan

doi:10.1002/9781118223208.ch9

Cited by 12 publications

(8 citation statements)

References 105 publications

(124 reference statements)

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“…Ladybirds (Coleoptera: Coccinellidae) are a textbook example of aposematic insects. Most species possess chemical substances (alkaloids and pyrazines) providing protection against avian as well as invertebrate predators (Marples et al, ; Nedvěd et al, ; Pettersson, ). Adults, mainly in the tribes Coccinellini and Chilocorini, are brightly coloured often with contrasting red/black or yellow/black patterns (Escalona et al, ).…”

Section: Introductionmentioning

confidence: 99%

Attacks by predators on artificial cryptic and aposematic insect larvae

Aslam

Nedvěd

Sam

2020

Entomologia Exp Applicata

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Colour and colour patterns seem to be especially important visual warning signals for predators, which might have innate or learned ability to avoid aposematic prey. To test the importance of larval colour pattern of the aposematic ladybird Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae), an invasive alien species in Europe, we presented the plasticine models of aposematic larvae to wild and naïve birds. We studied the attacks on aposematic larvae of various patterns and colours in nature and in an outdoor aviary. The larvae were cryptic (green), aposematic (resembling those of the H. axyridis larvae), and semi‐aposematic (i.e., black but missing the typical orange patches of H. axyridis larvae). We detected attacks on 71 larvae out of 450 (i.e., 2.6% daily predation). Twenty‐nine attacks were made by birds, 37 by arthropods, and five by gastropods. Wild birds attacked green and black larvae significantly more often than aposematic larvae. Colour did not have an effect on attacks by arthropods. The experiment with naïve birds was conducted in an outdoor aviary, where naïve great tits, Parus major L., were offered the same artificial larvae as in the first experiment. In total, 57 of 90 exposed larvae were attacked by birds (i.e., 28% daily predation), and green larvae were attacked significantly more than the aposematic larvae (but not more than black larvae). Our results imply that aposematic larvae of H. axyridis are more than 12× less likely to be predated by birds than green larvae in nature. The aposematic pattern represented a more effective signal than the semi‐aposematic signal. The ability to reject aposematic prey seemed to be innate in our birds.

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Section: Introductionmentioning

confidence: 99%

Attacks by predators on artificial cryptic and aposematic insect larvae

Aslam

Nedvěd

Sam

2020

Entomologia Exp Applicata

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“…For many species, including H. axyridis, aposematic colouration and intense smell of pyrazines provide additional protection from predation (Daloze et al 1995;Pasteels 2007;Ceryngier et al 2012;Pettersson 2012). Nevertheless, some animals can eat ladybirds, and these are usually generalist predators.…”

Section: Predators Of Harmonia Axyridismentioning

confidence: 99%

Predators and parasitoids of the harlequin ladybird, Harmonia axyridis, in its native range and invaded areas

et al. 2017

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“…Chemosensory reception is important in insects, including predacious ladybirds (Coleoptera: Coccinellidae), for food and mate location, and for finding a suitable habitat for oviposition [1–3]. Volatile molecules are typically detected by insects through neurons housed in chemosensory sensilla mainly located on antennae.…”

Section: Introductionmentioning

confidence: 99%

Antennal transcriptome analysis and identification of candidate chemosensory genes of the harlequin ladybird beetle,Harmonia axyridis(Pallas) (Coleoptera: Coccinellidae)

Rondoni

Roman

Meslin

et al. 2021

Preprint

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In predatory ladybirds (Coleoptera: Coccinellidae), antennae are important for chemosensory reception used during food and mate location, and for finding a suitable oviposition habitat. Based on NextSeq 550 Illumina sequencing, we assembled the antennal transcriptome of mated Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae) males and females and described the first chemosensory gene repertoire expressed in this species. We annotated candidate chemosensory sequences encoding 26 odorant receptors (including the coreceptor, Orco), 17 gustatory receptors, 27 ionotropic receptors, 31 odorant-binding proteins, 12 chemosensory proteins and 4 sensory neuron membrane proteins. Maximum-likelihood phylogenetic analyses allowed to assign can-didate H. axyridis chemosensory genes to previously described groups in each of these families. Differential expression analysis between males and females revealed low variability between sexes, possibly reflecting the known absence of relevant sexual dimorphism in the structure of the antennae and in the distribution and abundance of the sensilla. However, we revealed significant differences in expression of three chemosensory genes, namely 2 male-biased odorant-binding proteins and 1 male-biased odorant receptor, suggesting their possible involvement in pheromone detection. Our data pave the way for improving the understanding of the molecular basis of chemosensory reception in Coccinellidae.

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Coccinellids and Semiochemicals

Cited by 12 publications

References 105 publications

Attacks by predators on artificial cryptic and aposematic insect larvae

Attacks by predators on artificial cryptic and aposematic insect larvae

Predators and parasitoids of the harlequin ladybird, Harmonia axyridis, in its native range and invaded areas

Antennal transcriptome analysis and identification of candidate chemosensory genes of the harlequin ladybird beetle,Harmonia axyridis(Pallas) (Coleoptera: Coccinellidae)

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