NDLI: Eye spectral sensitivity in fresh- and brackish-water populations of three glacial-relict Mysis species (Crustacea): physiology and genetics of differential tuning

Content Provider	Springer Nature Link
Author	Donner, Kristian Zak, Pavel Viljanen, Martta Lindström, Magnus Feldman, Tatiana Ostrovsky, Mikhail
Copyright Year	2016
Abstract	Absorbance spectra of single rhabdoms were studied by microspectrophotometry (MSP) and spectral sensitivities of whole eyes by electroretinography (ERG) in three glacial-relict species of opossum shrimps (Mysis). Among eight populations from Fennoscandian fresh-water lakes (L) and seven populations from the brackish-water Baltic Sea (S), L spectra were systematically red-shifted by 20–30 nm compared with S spectra, save for one L and one S population. The difference holds across species and bears no consistent adaptive relation to the current light environments. In the most extensively studied L–S pair, two populations of M. relicta (L p and S p) separated for less than 10,000 years, no differences translating into amino acid substitutions have been found in the opsin genes, and the chromophore of the visual pigments as analyzed by HPLC is pure A1. However, MSP experiments with spectrally selective bleaching show the presence of two rhodopsins (λ max ≈ 525–530 nm, MWS, and 565–570 nm, LWS) expressed in different proportions. ERG recordings of responses to “red” and “blue” light linearly polarized at orthogonal angles indicate segregation of the pigments into different cells differing in polarization sensitivity. We propose that the pattern of development of LWS and MWS photoreceptors is governed by an ontogenetic switch responsive to some environmental signal(s) other than light that generally differ(s) between lakes and sea, and that this reaction norm is conserved from a common ancestor of all three species.
Starting Page	297
Ending Page	312
Page Count	16
File Format	PDF
ISSN	03407594
Journal	Journal of Comparative Physiology A
Volume Number	202
Issue Number	4
e-ISSN	14321351
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-03-16
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Vision Rhodopsin Phenotypic plasticity Evolutionary adaptation Compound eye Polarization sensitivity 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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Eye spectral sensitivity in fresh- and brackish-water populations of three glacial-relict Mysis species (Crustacea): physiology and genetics of differential tuning

Eye spectral sensitivity in fresh- and brackish-water populations of three glacial-relict Mysis species (Crustacea): physiology and genetics of differential tuning

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Eye spectral sensitivity in fresh- and brackish-water populations of three glacial-relict Mysis species (Crustacea): physiology and genetics of differential tuning

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