NDLI: Systematic variations in microvilli banding patterns along fiddler crab rhabdoms

Content Provider	Springer Nature Link
Author	Alkaladi, Ali How, Martin J. Zeil, Jochen
Copyright Year	2012
Abstract	Polarisation sensitivity is based on the regular alignment of dichroic photopigment molecules within photoreceptor cells. In crustaceans, this is achieved by regularly stacking photopigment-rich microvilli in alternating orthogonal bands within fused rhabdoms. Despite being critical for the efficient detection of polarised light, very little research has focused on the detailed arrangement of these microvilli bands. We report here a number of hitherto undescribed, but functionally relevant changes in the organisation of microvilli banding patterns, both within receptors, and across the compound eye of fiddler crabs. In all ommatidia, microvilli bands increase in length from the distal to the proximal ends of the rhabdom. In equatorial rhabdoms, horizontal bands increase gradually from 3 rows of microvilli distally to 20 rows proximally. In contrast, vertical equatorial microvilli bands contain 15–20 rows of microvilli in the distal 30 µm of the rhabdom, shortening to 10 rows over the next 30 µm and then increase in length to 20 rows in parallel with horizontal bands. In the dorsal eye, horizontal microvilli occupy only half the cross-sectional area as vertical microvilli bands. Modelling absorption along the length of fiddler crab rhabdoms suggests that (1) increasing band length assures that photon absorption probability per band remains constant along the length of photoreceptors, indicating that individual bands may act as units of transduction or adaptation; (2) the different organisation of microvilli bands in equatorial and dorsal rhabdoms tune receptors to the degree and the information content of polarised light in the environment.
Starting Page	99
Ending Page	113
Page Count	15
File Format	PDF
ISSN	03407594
Journal	Journal of Comparative Physiology A
Volume Number	199
Issue Number	2
e-ISSN	14321351
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-10-30
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Microvilli banding Rhabdom Polarisation vision Dichroism Fiddler crab Animal Physiology Neurosciences Zoology
Content Type	Text
Resource Type	Article
Subject	Physiology Behavioral Neuroscience Animal Science and Zoology Ecology, Evolution, Behavior and Systematics

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