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Titolo:
The ontogeny of ultraviolet sensitivity, cone disappearance and regeneration in the sockeye salmon Oncorhynchus nerka
Autore:
Flamarique, IN;
Indirizzi:
Univ Victoria, Dept Biol, Victoria, BC V8W 3N5, Canada Univ Victoria Victoria BC Canada V8W 3N5 ol, Victoria, BC V8W 3N5, Canada
Titolo Testata:
JOURNAL OF EXPERIMENTAL BIOLOGY
fascicolo: 7, volume: 203, anno: 2000,
pagine: 1161 - 1172
SICI:
0022-0949(200004)203:7<1161:TOOUSC>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUCKER CATOSTOMUS-COMMERSONI; VISUAL PIGMENT CONTENT; JUVENILE YELLOW PERCH; RAINBOW-TROUT; RETINOIC ACID; THYROID-HORMONES; POLARIZATION SENSITIVITY; PHOTORECEPTOR MORPHOLOGY; ATLANTIC SALMON; FRESH-WATER;
Keywords:
vision; retina; photoreceptor mechanism; ultraviolet-A light; ganglion cell; sockeye salmon; Oncorhynchus nerka;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
56
Recensione:
Indirizzi per estratti:
Indirizzo: Flamarique, IN Inst Marine Res, Austevoll Aquaculture Res Stn, N-5392 Storebo, Norway Inst Marine Res Storebo Norway N-5392 392 Storebo, Norway
Citazione:
I.N. Flamarique, "The ontogeny of ultraviolet sensitivity, cone disappearance and regeneration in the sockeye salmon Oncorhynchus nerka", J EXP BIOL, 203(7), 2000, pp. 1161-1172

Abstract

This study examines the spectral sensitivity and cone topography of the sockeye salmon Oncorhynchus nerka throughout its life history with special emphasis on ultraviolet sensitivity. Electrophysiological recordings from theoptic nerve show that ultraviolet sensitivity is greatly diminished at thesmolt stage but reappears in adult fish weighing about 201 g. Concomitantly, light microscopy observations of the retina show that ultraviolet cones disappear from the dorsal and temporal retina at the smolt stage but reappear at the adult stage. These changes occur for sockeye salmon raised in fresh water or salt water after smoltification. In contrast to this ultraviolet cycle, the other cone mechanisms (short-, middle- and long-wavelength-sensitive) and the rod mechanism remain present throughout ontogeny. The natural appearance and disappearance of ultraviolet cones in salmonid retinas follows surges in blood thyroxine at critical developmental periods. Their presence coincides with times of prominent feeding on zooplankton and/or small fish that may be more visible under ultraviolet light. It is proposed that the primary function of ultraviolet cones in salmonids is to improve preycontrast.

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Documento generato il 31/03/20 alle ore 17:12:16