KOPS - Das Institutionelle Repositorium der Universität Konstanz

Sexual dimorphism and light/dark adaptation in the compound eyes of male and female Acentria ephemerella (Lepidoptera: Pyraloidea: Crambidae)

Sexual dimorphism and light/dark adaptation in the compound eyes of male and female Acentria ephemerella (Lepidoptera: Pyraloidea: Crambidae)

Zitieren

Dateien zu dieser Ressource

Prüfsumme: MD5:dd3c3f10c0898d9428a81920db92c2cf

LAU, Ting Fan Stanley, Elisabeth GROSS, Victor Benno MEYER-ROCHOW, 2007. Sexual dimorphism and light/dark adaptation in the compound eyes of male and female Acentria ephemerella (Lepidoptera: Pyraloidea: Crambidae). In: European Journal of Entomology. 104(3), pp. 459-470. ISSN 1210-5759. eISSN 1802-8829. Available under: doi: 10.14411/eje.2007.066

@article{Lau2007Sexua-8537, title={Sexual dimorphism and light/dark adaptation in the compound eyes of male and female Acentria ephemerella (Lepidoptera: Pyraloidea: Crambidae)}, year={2007}, doi={10.14411/eje.2007.066}, number={3}, volume={104}, issn={1210-5759}, journal={European Journal of Entomology}, pages={459--470}, author={Lau, Ting Fan Stanley and Gross, Elisabeth and Meyer-Rochow, Victor Benno} }

In the highly sexual-dimorphic nocturnal moth, Acentria ephemerella Denis & Schiffermüller 1775, the aquatic and wingless female possesses a refracting superposition eye, whose gross structural organization agrees with that of the fully-winged male. The possession of an extensive corneal nipple array, a wide clear-zone in combination with a voluminous rhabdom and a reflecting tracheal sheath are proof that the eyes of both sexes are adapted to function in a dimly lit environment. However, the ommatidium of the male eye has statistically significantly longer dioptric structures (i.e., crystalline cones) and light-perceiving elements (i.e., rhabdoms), as well as a much wider clear-zone than the female. Photomechanical changes upon light/dark adaptation in both male and female eyes result in screening pigment translocations that reduce or dilate ommatidial apertures, but because of the larger number of smaller facets of the male eye in combination with the structural differences of dioptric apparatus and retina (see above) the male eye would enjoy superior absolute visual sensitivity under dim conditions and a greater resolving power and ability to detect movement during the day. The arrangement of the microvilli in the rhabdom of both genders suggests that their eyes are polarization-sensitive, an ability they would share with many aquatic insects that have to recognize water surfaces. Although sexual recognition in A. ephemerella is thought to chiefly rely on pheromones, vision must still be important for both sexes, even if the females are wingless and never leave their watery habitat. Females swim actively under water and like their male counterparts, which fly above the surface of the water, they would have to see and avoid obstacles as well as potential predators. This, together with a small incidence of winged females, we believe, could be the reason why the eyes of female A. ephemerella are less regressed than those of other sexually dimorphic moths, like for instance Orgyia antiqua. Another, but difficult to test, possibility is that male and female A. ephemerella have diverged in their behaviour and habitat preferences less long ago than other sexually dimo rphic moths. application/pdf Lau, Ting Fan Stanley Meyer-Rochow, Victor Benno Gross, Elisabeth deposit-license 2011-03-24T17:44:29Z Gross, Elisabeth eng 2011-03-24T17:44:29Z First publ. in: European Journal of Entomology 104 (2007), pp. 459-470 Meyer-Rochow, Victor Benno 2007 Sexual dimorphism and light/dark adaptation in the compound eyes of male and female Acentria ephemerella (Lepidoptera: Pyraloidea: Crambidae) Lau, Ting Fan Stanley

Dateiabrufe seit 01.10.2014 (Informationen über die Zugriffsstatistik)

Sexual_dimorphism_and_light.pdf 153

Das Dokument erscheint in:

deposit-license Solange nicht anders angezeigt, wird die Lizenz wie folgt beschrieben: deposit-license

KOPS Suche


Stöbern

Mein Benutzerkonto