"Accessory corner cones" as putative UV-sensitive photoreceptors in the retinas of seven adult nototheniid fishes

Miyazaki, Taeko; Iwami, Tetsuo; Yamauchi, Masatake; Somiya, Hiroaki

doi:10.1007/s003000100278

Cited by 8 publications

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“…The retina of this species is organised into a typical square mosaic in which the double cones form the sides of a square, each orientated 90°to its closest neighbours. In contrast to the previous study by Miyazaki et al (2001), there appears to be only a single morphologically distinct class of central single cones, with corner cones absent, which may explain the failure to identify UV cones by MSP. Two distinct retinal arrangements are therefore present in two related species within the same family.…”

Section: Discussioncontrasting

confidence: 99%

“…In a number of species of Trematomus, there is a typical square cone mosaic with both central and corner single cones (Meyer-Rochow and Klyne, 1982;Miyazaki et al, 2002;Miyazaki et al, 2001). Miyazaki et al have assumed that because the corner cones in many teleosts are UV sensitive, this will also be the case in the notothenioids.…”

Section: Discussionmentioning

confidence: 99%

“…Single and double cones have been reported in a number of species (Eastman and Lannoo, 2003;Meyer-Rochow and Klyne, 1982;Miyazaki et al, 2002), and Miyazaki et al (2001) identified a square mosaic that is formed with double cones at the sides and single cones in the centre and at each of the four corners. Cones in corner positions have been shown to contain a UV-sensitive visual pigment in the retinae of a number of teleost species (Avery et al, 1983;Bowmaker et al, 1991b;Hárosi and Hashimoto, 1983;Hisatomi et al, 1996Hisatomi et al, , 1997Whitmore and Bowmaker, 1989), so it is possible that UV sensitivity is also present in notothenioid fishes.…”

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Adaptations to an extreme environment: retinal organisation and spectral properties of photoreceptors in Antarctic notothenioid fish

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Cheng

Bowmaker

et al. 2005

Journal of Experimental Biology

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The Notothenioid suborder of teleosts comprises a number of species that live below the sea ice of the Antarctic. The presence of 'antifreeze' glycoproteins in these fish as an adaptation to freezing temperature has been well documented but little is known about the adaptations of the visual system of these fish to a light environment in which both the quantity and spectral composition of downwelling sunlight has been reduced by passage through ice and snow. In this study, we show that the red/long-wave sensitive (LWS) opsin gene is not present in these fish but a UV-sensitive short-wave sensitive (SWS1) pigment is expressed along with bluesensitive (SWS2) and green/middle-wave sensitive (Rh2) pigments. The identity and spectral location of maximal absorbance of the SWS1 and Rh2 pigments was confirmed by in vitro expression of the recombinant opsins followed by regeneration with 11-cis retinal. Only the SWS2 pigment showed interspecific variations in peak absorbance. Expression of the Rh2 opsin is localised to double cone receptors in both the central and peripheral retina, whereas SWS2 opsin expression is present only in the peripheral retina. SWS1 cones could not be identified by either microspectrophotometry or in situ hybridisation, presumably reflecting their low number and/or uneven distribution across the retina. A study of photoreceptor organisation in the retina of two species, the shallower dwelling Trematomus hansoni and the deeper dwelling Dissostichus mawsoni, identified a square mosaic in the former, and a row mosaic in the latter species; the row mosaic in Dissostichus mawsoni with less tightly packed cone photoreceptors allows for a higher rod photoreceptor density.

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Section: Discussionmentioning

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Adaptations to an extreme environment: retinal organisation and spectral properties of photoreceptors in Antarctic notothenioid fish

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Cheng

Bowmaker

et al. 2005

Journal of Experimental Biology

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“…Although several specific visual tasks for UV-vision have been proposed (foraging, navigation, and/or communication) and we have very few direct observations on visual feeding in Antarctic fishes, we suggested that Antarctic fishes could increase their feeding efficiency and stock energy by making use of UV-vision during the summer month (Miyazaki et al ., 2001).…”

Section: Introductionmentioning

confidence: 99%

“…Recently, we reported the presence of ACCs histologically from the eyes of adults of seven Antarctic nototheniid species as follows: Trematomus bernacchii, Trematomus newnesi, Trematomus hansoni, Trematomus pennellii, Trematomus scotti, Pagothenia borchgrevinki, Lepidonotothen squamifrons (= kempi ) (Miyazaki et al ., 2001). Although several specific visual tasks for UV-vision have been proposed (foraging, navigation, and/or communication) and we have very few direct observations on visual feeding in Antarctic fishes, we suggested that Antarctic fishes could increase their feeding efficiency and stock energy by making use of UV-vision during the summer month (Miyazaki et al ., 2001).…”

Section: Introductionmentioning

confidence: 99%

Retinal Topography of Ganglion Cells and Putative UV-Sensitive Cones in Two Antarctic Fishes: Pagothenia borchgrevinki and Trematomus bernacchii (Nototheniidae)

Miyazaki¹,

Iwami

Somiya

et al. 2002

Zoological Science

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Divergence of brain and retinal anatomy and histology in pelagic antarctic notothenioid fishes of the sister taxa Dissostichus and Pleuragramma

Eastman

Lannoo

2011

Journal of Morphology

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The neutrally buoyant Antarctic fishes of the sister taxa Dissostichus (D. eleginoides and D. mawsoni) and Pleuragramma antarcticum diverged early in the notothenioid radiation and filled different niches in the pelagic realm of the developing Southern Ocean. To assess the influence of phylogenetic and ecological factors in shaping neural morphology in these taxa, we studied the anatomy and histology of the brains and retinae, and determined the proportional weights of brain regions. With the brain of the non-Antarctic sister taxon Eleginops maclovinus as plesiomorphic, statistically significant departures in the brains of the two Antarctic taxa include reduction of the corpus cerebelli and expansion of the mesencephalon and medulla. Compared to Eleginops, both species also have a relatively smaller telencephalon, although this is significant only in Dissostichus. There are a number of apomorphic features in the brain of Pleuragramma including reduced olfactory nerves and bulbs, an extremely small corpus cerebelli and an expanded mesencephalon. Although there is not a significant difference in the relative weights of the medulla in the two taxa, the prominence of the eminentia granularis and bulging cap-like appearance of the crista cerebellaris are distinctive in Pleuragramma. Brain histology of Dissostichus and Pleuragramma reflects typical perciform patterns and the two species of Dissostichus are histologically identical. Lateral compression in Pleuragramma and notable lobation in Dissostichus also contribute to differences between the taxa. Compression in Pleuragramma is attributable to convergence on an anchovy/herring body shape and to the relatively large brain in this small fish. The less prominent pattern of lobation of the telencephalon, inferior lobes and corpus cerebelli in Pleuragramma probably reflects underlying histology, specifically a reduction in cellularity of the neuropil in the nuclei and lobes. The retinal histology of Dissostichus and Pleuragramma encompasses the extremes seen in Antarctic notothenioids. Dissostichus has a thin scotopic retina with few cones and a high degree of summation. The retina of Pleuragramma is thick and cellular with many small single cones and rods and resembles that of Eleginops. Pedomorphy has not influenced brain morphology in these species but Pleuragramma has superficial neuromasts that are pedomorphic. Although Dissostichus and Pleuragramma are sympatric in the water column, their brains and retinae are highly divergent and reflect the influences of both phylogeny and ecological partitioning of the pelagic realm. Compared to Eleginops, the relatively smaller corpus cerebelli but relatively larger medulla probably indicates, respectively, reduced activity levels of notothenioids in subzero temperatures and expansion of the mechanosensory lateral line system as a supplement to vision under conditions of reduced light. Compared to Dissostichus, Pleuragramma has reduced olfactory bulbs and corpus cerebelli and an expanded mesencephalon. The reduction of the co...

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"Accessory corner cones" as putative UV-sensitive photoreceptors in the retinas of seven adult nototheniid fishes

Cited by 8 publications

References 0 publications

Adaptations to an extreme environment: retinal organisation and spectral properties of photoreceptors in Antarctic notothenioid fish

Adaptations to an extreme environment: retinal organisation and spectral properties of photoreceptors in Antarctic notothenioid fish

Retinal Topography of Ganglion Cells and Putative UV-Sensitive Cones in Two Antarctic Fishes: Pagothenia borchgrevinki and Trematomus bernacchii (Nototheniidae)

Divergence of brain and retinal anatomy and histology in pelagic antarctic notothenioid fishes of the sister taxa Dissostichus and Pleuragramma

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