The giant mottled eel, Anguilla marmorata, uses blue-shifted rod photoreceptors during upstream migration

Autor: Hong Young Yan, I-Li Wang, Wen-Chun Fu, Tzi-Yuan Wang, Feng-Yu Wang
Jazyk: angličtina
Rok vydání: 2014
Předmět:
Evolutionary Genetics
Opsin
genetic structures
Evolutionary Physiology
Vision
Visual System
Physiology
Ontogeny
Sensory Physiology
Fish Metamorphosis
lcsh:Medicine
Behavioral Ecology
Homing Behavior
Retinal Rod Photoreceptor Cells
Gene expression
lcsh:Science
Phylogeny
Multidisciplinary
Ecology
Animal Behavior
biology
Gene Expression Regulation
Developmental
Sensory Systems
Cell biology
Giant mottled eel
Spectral sensitivity
Sensory Perception
Research Article
Rhodopsin
animal structures
Fish Biology
Retinal binding
Marine Biology
Duplex retina
Species Specificity
Fish Physiology
Animals
Animal Physiology
Scotopic vision
Ecosystem
Vision
Ocular
Evolutionary Biology
Color Vision
Opsins
Metamorphosis
lcsh:R
Biology and Life Sciences
Fisheries Science
Anguilla
biology.organism_classification
Vertebrate Physiology
Animal Migration
lcsh:Q
sense organs
Zoology
Developmental Biology
Neuroscience
Zdroj: PLoS ONE, Vol 9, Iss 8, p e103953 (2014)
PLoS ONE
ISSN: 1932-6203
Popis: Catadromous fishes migrate between ocean and freshwater during particular phases of their life cycle. The dramatic environmental changes shape their physiological features, e.g. visual sensitivity, olfactory ability, and salinity tolerance. Anguilla marmorata, a catadromous eel, migrates upstream on dark nights, following the lunar cycle. Such behavior may be correlated with ontogenetic changes in sensory systems. Therefore, this study was designed to identify changes in spectral sensitivity and opsin gene expression of A. marmorata during upstream migration. Microspectrophotometry analysis revealed that the tropical eel possesses a duplex retina with rod and cone photoreceptors. The λmax of rod cells are 493, 489, and 489 nm in glass, yellow, and wild eels, while those of cone cells are 508, and 517 nm in yellow, and wild eels, respectively. Unlike European and American eels, Asian eels exhibited a blue-shifted pattern of rod photoreceptors during upstream migration. Quantitative gene expression analyses of four cloned opsin genes (Rh1f, Rh1d, Rh2, and SWS2) revealed that Rh1f expression is dominant at all three stages, while Rh1d is expressed only in older yellow eel. Furthermore, sequence comparison and protein modeling studies implied that a blue shift in Rh1d opsin may be induced by two known (N83, S292) and four putative (S124, V189, V286, I290) tuning sites adjacent to the retinal binding sites. Finally, expression of blue-shifted Rh1d opsin resulted in a spectral shift in rod photoreceptors. Our observations indicate that the giant mottled eel is color-blind, and its blue-shifted scotopic vision may influence its upstream migration behavior and habitat choice.
Databáze: OpenAIRE
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