Specializations in the compound eye of Talitrus saltator (Crustacea, Amphipoda)

Year: 2020

Authors: Ciofini A., Yamahama Y., Mercatelli L., Hariyama T., Ugolini A.

Autors Affiliation: Univ Florence, Dept Biol, Via Romana 17, I-50125 Florence, Italy; Hamamatsu Univ, Sch Med, Dept Biol, Higashi Ku, 1-20-1 Handayama, Hamamatsu, Shizuoka 4313192, Japan; CNR, Natl Inst Opt, Largo Fermi 6, I-50125 Florence, Italy; Hamamatsu Univ, Inst NanoSuit Res, Sch Med, Preeminent Med Photon Educ & Res Ctr, 1-20-1 Handayama, Hamamatsu, Shizuoka 4313192, Japan.

Abstract: We investigated the eye regionalization in Talitrus saltator by morphological, electrophysiological and behavioural experiments. Each ommatidium possesses fve radially arranged retinular cells producing a square fused rhabdom by R1–R4 cells; the smaller R5 exists between R1 and R4. The size of R5 rhabdomere is larger in the dorsal part and becomes smaller in the median and ventral parts of the eye. Spectral-sensitivity by electroretinograms were recorded from dorsal or ventral parts of the eye. The dorsal part possesses maxima at green and UV-blue region. The main response region in the ventral part is only from UV (390 nm) to blue (430 nm) decreasing at longer wavelengths. To evaluate the sandhoppers’ celestial orientation, their eyes were painted black either in the dorsal or ventral part, under the natural sky or a blue flter with or without the vision of the sun. Sandhoppers with the dorsal region of the eyes painted and tested under the screened sun were more dispersed and their directions varied more than in other groups of individuals. Sandhoppers with this area of the eye obscured display considerable difculties to head in a specifc direction. This work suggests the existence of regional specializations
in the eye of T. saltator.

Journal/Review: JOURNAL OF COMPARATIVE PHYSIOLOGY A-NEUROETHOLOGY SENSORY NEURAL AND BEHAVIORAL PHYSIOLOGY

Volume: 206 (5)      Pages from: 711  to: 723

More Information: The research was funded by the ex-60% local funds of Firenze University assigned to A. Ugolini, by JSPS KAKENHI (JP18H01869) to T. Hariyama, and by JSPS KAKENHI (JP17K19387) to Y. Yamahama.
KeyWords: Crustaceans · Sandhoppers · Talitrus saltator · Eye regionalization · Compass orientation
DOI: 10.1007/s00359-020-01432-8

Citations: 4
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