Insect pupil mechanisms

Stavenga, Doekele G.; Numan, J.A.J.; Tinbergen, Joost M.; Kuiper, Jan Willem

doi:10.1007/bf00610454

Cited by 45 publications

(13 citation statements)

References 22 publications

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“…Photostable screening pigments in the eye fundamentally function as pupils, which attenuate light influx upon light adaptation [34, 35]. In some cases, colorful perirhabdomal pigments should be regarded as serving a modified function: creating a greater variety of spectrally dissimilar photoreceptors in order to improve color discrimination ability [2, 36].…”

Section: Discussionmentioning

confidence: 99%

Red-shift of spectral sensitivity due to screening pigment migration in the eyes of a moth, Adoxophyes orana

et al. 2017

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BackgroundWe have found that the spectral sensitivity of the compound eye in the summer fruit tortrix moth (Adoxophyes orana) differs in laboratory strains originating from different regions of Japan. We have investigated the mechanisms underlying this anomalous spectral sensitivity.MethodsWe applied electrophysiology, light and electron microscopy, opsin gene cloning, mathematical modeling, and behavioral analysis.ResultsThe ERG-determined spectral sensitivity of dark-adapted individuals of all strains peaks around 520 nm. When light-adapted, the spectral sensitivity of the Nagano strain narrows and its peak shifts to 580 nm, while that in other strains remains unchanged. All tested strains appear to be identical in terms of the basic structure of the eye, the pigment migration in response to light- and dark-adaptation, and the molecular structure of long-wavelength absorbing visual pigments. However, the color of the perirhabdomal pigment clearly differs; it is orange in the Nagano strain and purple in the others. The action spectrum of phototaxis appears to be shifted towards longer wavelengths in the Nagano individuals.ConclusionsThe spectral sensitivities of light-adapted eyes can be modeled under the assumption that this screening pigment plays a crucial role in determining the spectral sensitivity. The action spectrum of phototaxis indicates that the change in the eye spectral sensitivity is behaviorally relevant.

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Section: Discussionmentioning

confidence: 99%

Red-shift of spectral sensitivity due to screening pigment migration in the eyes of a moth, Adoxophyes orana

et al. 2017

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“…Since the methods based on antidromic transmission or on eyeshine are successful in only a small fraction of species that exhibit pupillary responses, it seemed promising to utilize the widely encountered pupillary scattering [5][6][7][8] as a tool for measuring the spectral sensitivities of photoreceptor cells in intact animals. Dipteran flies were chosen as first subjects because they have been well studied with other techniques.…”

Section: Omentioning

confidence: 99%

“…This study demonstrates the utility of exploiting pupillary scattering to investigate invertebrate retinular cells. Non-invasive, optical techniques have the following advantages over classical electrophysiological techniques: (1) the experimental animal is completely intact: (2) responses are stable and reproducible over very long periods of time; (3) single cell-types can be isolated; and (4) both physiological and photochemical measurements can be performed on identical photoreceptor cells [7,8,16]. [1][2][3].…”

Section: Omentioning

confidence: 99%

“…The incidence of leukemia in hairless mice is 45% at 8-10 months of age compared to 1% in haired mice (HRS/J-hr/+) [5]. Hairless mice have vastly elevated levels of ecotropic [6] and, by eight months of age, also xenotropic [7] MuLV compared with haired tittermates; in addition, polytropic or mink cell focus (MCF)-forming recombinants between these two virus classes occur in most, if not all, leukemic and preleukemic hairless mice [7]. We have found in HRS/J mice that suppression of ecotropic MuLV by passive neonatal immunization significantly decreases the development of leukemia.…”

Section: Omentioning

confidence: 99%

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Spectral sensitivities of retinular cells measured in intact, living bumblebees by an optical method

Bernard

Stavenga

1978

Naturwissenschaften

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“…4a, b). The mobile pigment granules in the photoreceptors probably function as a light-controlling pupil mechanism, similarly as in butterfly photoreceptors (Stavenga et al 1977). …”

Section: Discussionmentioning

confidence: 99%

The giant butterfly-moth Paysandisia archon has spectrally rich apposition eyes with unique light-dependent photoreceptor dynamics

et al. 2018

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The palm borer moth Paysandisia archon (Burmeister, 1880) (fam. Castniidae) is a large, diurnally active palm pest. Its compound eyes consist of ~ 20,000 ommatidia and have apposition optics with interommatidial angles below 1°. The ommatidia contain nine photoreceptor cells and appear structurally similar to those in nymphalid butterflies. Two morphological ommatidial types were identified. Using the butterfly numbering scheme, in type I ommatidia, the distal rhabdom consists exclusively of the rhabdomeres of photoreceptors R1–2; the medial rhabdom has contributions from R1–8. The rhabdom in type II ommatidia is distally split into two sub-rhabdoms, with contributions from photoreceptors R2, R3, R5, R6 and R1, R4, R7, R8, respectively; medially, only R3–8 and not R1–2 contribute to the fused rhabdom. In both types, the pigmented bilobed photoreceptors R9 contribute to the rhabdom basally. Their nuclei reside in one of the lobes. Upon light adaptation, in both ommatidial types, the rhabdoms secede from the crystalline cones and pigment granules invade the gap. Intracellular recordings identified four photoreceptor classes with peak sensitivities in the ultraviolet, blue, green and orange wavelength regions (at 360, 465, 550, 580 nm, respectively). We discuss the eye morphology and optics, the photoreceptor spectral sensitivities, and the adaptation to daytime activity from a phylogenetic perspective.Electronic supplementary materialThe online version of this article (10.1007/s00359-018-1267-z) contains supplementary material, which is available to authorized users.

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Insect pupil mechanisms

Cited by 45 publications

References 22 publications

Red-shift of spectral sensitivity due to screening pigment migration in the eyes of a moth, Adoxophyes orana

Red-shift of spectral sensitivity due to screening pigment migration in the eyes of a moth, Adoxophyes orana

Spectral sensitivities of retinular cells measured in intact, living bumblebees by an optical method

The giant butterfly-moth Paysandisia archon has spectrally rich apposition eyes with unique light-dependent photoreceptor dynamics

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