Sexual dimorphism in the attachment ability of the Colorado potato beetle Leptinotarsa decemlineata (Coleoptera: Chrysomelidae) to rough substrates

Voigt, Dagmar; Schuppert, Jan; Dattinger, S.; Gorb, Stanislav N.

doi:10.1016/j.jinsphys.2008.02.006

Cited by 177 publications

(217 citation statements)

References 44 publications

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“…reduced on average by 88 per cent and in comparison to the reference substrate glass even by 96 per cent. Our findings support the roughness hypothesis ( proposed in [7,8,14,22,23]), assuming that a critical roughness reducing the real contact area between the insect's attachment devices and the substrate is a crucial parameter to minimize its attachment ability. According to the dimensions of the single setae of the Colorado potato beetle, the tip of a seta may come to lie on several folds.…”

Section: K a K Isupporting

confidence: 90%

“…The tarsus consists of five tarsomeres, with the fourth tarsomere being hidden, and a pair of curved claws on the pretarsus [22]. The diameter of the claw tips is 8 -10 mm.…”

Section: Morphologymentioning

confidence: 99%

“…The diameter of the claw tips is 8 -10 mm. Tarsi are of the hairy type, with tarsomeres 1 -3 being covered with setae of four different types (according to Voigt et al [22]). …”

Section: Morphologymentioning

confidence: 99%

“…Setae are termed according to Voigt et al [22], with setae of the filamentous and lanceolate type being grouped as tapered setae. M, setae of discoidal type; S, spatula-shaped setae; T, tapered setae.…”

Section: Traction Experimentsmentioning

confidence: 99%

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Plant surfaces with cuticular folds are slippery for beetles

Prüm

Seidel

Bohn

et al. 2011

J. R. Soc. Interface.

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Plant surfaces covered with three-dimensional (3D) waxes are known to strongly reduce insect adhesion, leading to slippery surfaces. Besides 3D epicuticular waxes, cuticular folds are a common microstructure found on plant surfaces, which have not been quantitatively investigated with regard to their influence on insect adhesion. We performed traction experiments with Colorado potato beetles on five plant surfaces with cuticular folds of different magnitude. For comparison, we also tested (i) smooth plant surfaces and (ii) plant surfaces possessing 3D epicuticular waxes. Traction forces on surfaces with medium cuticular folds, of about 0.5 mm in both height and thickness and a spacing of 0.5 -1.5 mm, were reduced by an average of 88 per cent in comparison to smooth plant surfaces. Traction forces were reduced by the same order of magnitude as on plant surfaces covered with 3D epicuticular waxes. For surface characterization, we performed static contact angle measurements, which proved a strong effect of cuticular folds also on surface wettability. Surfaces possessing cuticular folds of greater magnitude showed higher contact angles up to superhydrophobicity. We hypothesize that cuticular folds reduce insect adhesion mainly due to a critical roughness, reducing the real contact area between the surface and the insect's adhesive devices.

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Section: K a K Isupporting

confidence: 90%

“…The tarsus consists of five tarsomeres, with the fourth tarsomere being hidden, and a pair of curved claws on the pretarsus [22]. The diameter of the claw tips is 8 -10 mm.…”

Section: Morphologymentioning

confidence: 99%

“…The diameter of the claw tips is 8 -10 mm. Tarsi are of the hairy type, with tarsomeres 1 -3 being covered with setae of four different types (according to Voigt et al [22]). …”

Section: Morphologymentioning

confidence: 99%

Section: Traction Experimentsmentioning

confidence: 99%

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Plant surfaces with cuticular folds are slippery for beetles

Prüm

Seidel

Bohn

et al. 2011

J. R. Soc. Interface.

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“…There are numerous studies on attachment systems of adult chrysomelids, e.g. [11,42], but almost no quantitative details are known on attachment of chrysomelid larvae [20,[22][23][24]35,36]. In this study, for the first time, we analysed the performance of attachment systems of beetle larvae, described larval gait patterns and measured larval attachment ability in different situations.…”

Section: Discussionmentioning

confidence: 99%

Locomotion and attachment of leaf beetle larvaeGastrophysa viridula(Coleoptera, Chrysomelidae)

2015

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While adult green dock leaf beetles Gastrophysa viridula use tarsal adhesive setae to attach to and walk on smooth vertical surfaces and ceilings, larvae apply different devices for similar purposes: pretarsal adhesive pads on thoracic legs and a retractable pygopod at the 10th abdominal segment. Both are soft smooth structures and capable of wet adhesion. We studied attachment ability of different larval instars, considering the relationship between body weight and real contact area between attachment devices and the substrate. Larval gait patterns were analysed using high-speed video recordings. Instead of the tripod gait of adults, larvae walked by swinging contralateral legs simultaneously while adhering by the pygopod. Attachment ability of larval instars was measured by centrifugation on a spinning drum, revealing that attachment force decreases relative to weight. Contributions of different attachment devices to total attachment ability were investigated by selective disabling of organs by covering them with melted wax. Despite their smaller overall contact area, tarsal pads contributed to a larger extent to total attachment ability, probably because of their distributed spacing. Furthermore, we observed different behaviour in adults and larvae when centrifuged: while adults gradually slipped outward on the centrifuge drum surface, larvae stayed at the initial position until sudden detachment.

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Friction Reduction Effect Caused by Microcontact and Load Dispersion on the Moth‐Eye Structure

Tsujioka,

Koda,

Hirai

et al. 2024

Adv Eng Mater

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Friction reduction is important from the viewpoint of energy problems and other issues. Frictional forces are known to vary depending on the material property, surface texture, and measurement scale. However, the effect of submicron‐sized moth‐eye structures prepared of robust plastic deformation materials on dry friction under high‐load conditions has not been investigated in detail. To investigate this, a copper moth‐eye structure is fabricated via electroforming for experimental measurements. Results from the friction tests reveal that real contact area increase is suppressed, as the friction coefficient of the moth‐eye structure decreases exponentially with increasing load. Further friction simulation demonstrates nanoscale contact between the structure's tip and indenter, indicating that the real contact area increase requires deformation of the moth‐eye structure itself (microcontact). However, the contact pressure on the surface is reduced by dispersing the load to the sides and bottom of the moth‐eye structure. Therefore, the suppression of real contact area increase can be attributed to the deformation suppression facilitated by load dispersion. These findings expand the possibilities for friction design with surface textures because they reveal the role of robustness due to submicron‐scale surface microstructure in reducing friction between plastic deformation materials.

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Sexual dimorphism in the attachment ability of the Colorado potato beetle Leptinotarsa decemlineata (Coleoptera: Chrysomelidae) to rough substrates

Cited by 177 publications

References 44 publications

Plant surfaces with cuticular folds are slippery for beetles

Plant surfaces with cuticular folds are slippery for beetles

Locomotion and attachment of leaf beetle larvaeGastrophysa viridula(Coleoptera, Chrysomelidae)

Friction Reduction Effect Caused by Microcontact and Load Dispersion on the Moth‐Eye Structure

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