Trichromacy in Australian Marsupials

  title={Trichromacy in Australian Marsupials},
  author={Catherine A. Arrese and Nathan S. Hart and N. Thomas and Lyn Beazley and Julia Shand},
  journal={Current Biology},
Vertebrate color vision is best developed in fish, reptiles, and birds with four distinct cone receptor visual pigments. These pigments, providing sensitivity from ultraviolet to infrared light, are thought to have been present in ancestral vertebrates. When placental mammals adopted nocturnality, they lost two visual pigments, reducing them to dichromacy; primates subsequently reevolved trichromacy. Studies of mammalian color vision have largely overlooked marsupials despite the wide variety… Expand
Cone visual pigments in two species of South American marsupials.
Analysis of the Monodelphis genome confirms the absence of other classes of cone visual pigment genes, and reports the cone opsin sequences from two nocturnal South American marsupial species, the gray short-tailed opossums and the big-eared opossum, Didelphis aurita. Expand
Diversity of Color Vision: Not All Australian Marsupials Are Trichromatic
This study is the first comprehensive and quantitative account of color vision in Australian marsupials where it is known that an unexpected diversity of different color vision systems appears to have evolved. Expand
Visual Pigments and Colour Vision in Marsupials and Monotremes
The gene structure and expression of monotreme cone opsin genes bridge the phylogenetic gap between reptiles and other mammals. Expand
Cone pigments in a North American marsupial, the opossum (Didelphis virginiana)
The Virginia opossum (Didelphis virginiana), a profoundly nocturnal animal, is the only marsupial species found in North America and a series of additional experiments that employed various chromatic adaptation paradigms were conducted in a search for possible contributions from a second (short-wavelength sensitive) cone pigment, but it was found no evidence that such a mechanism contributes to the ERG. Expand
The ecology of visual pigment tuning in an Australian marsupial: the honey possum Tarsipes rostratus
It is found that overall the honey possum's long-wave tuning is more adaptive than that of the other marsupial species, and a possible ecological pressure may be provided by the third task - the difficult and potentially critical discrimination of the maturity of the animal's major food supply, the flowers of Banksia attenuata. Expand
Photoreceptor topography and spectral sensitivity in the common brushtail possum (Trichosurus vulpecula)
It is hypothesized that brushtail possums are so strongly nocturnal that their acuity is set by the scotopic visual system, and have minimized the number of cones necessary to serve the ganglion cells for photopic vision. Expand
Molecular evolution of bat color vision genes.
Surprisingly, the S opsin in these bats may be sensitive to UV light, which is relatively more abundant at dawn and at dusk, which may provide insights into the effect of nocturnal life on the evolution of opsin genes in mammals and the Evolution of the life history traits of bats in general. Expand
The cone visual pigments of an Australian marsupial, the tammar wallaby (Macropus eugenii): sequence, spectral tuning, and evolution.
This study is the first to determine the mRNA sequence, infer the amino acid sequence, and determine, by in vitro expression, the spectra of the cone opsins of a marsupial, the tammar wallaby (Macropus eugenii), which yielded some information on mechanisms and evolution of spectral tuning of these pigments. Expand
Comparative retinal morphology of the platypus
Evaluation of opsins indicates that red and blue immunoreactive cone opsins, but not rhodopsin, are present in the most basal of the extant species examined, the Pacific hagfish, establishing emergence of this pigment in an extant relative of tetrapods. Expand
Topographies of retinal cone photoreceptors in two Australian marsupials
Microspectrophotometry indicates the presence of at least three cone visual pigments in two Australian marsupials, the fat-tailed dunnart and honey possum, and the distribution of cone types using antisera that recognize short-wavelength-sensitive (SWS) and medium-to-long-wa wavelength- sensitive (M/LWS) cone opsins is examined. Expand


Evolution of colour vision in vertebrates
The expression of five major families of visual pigments occurred early in vertebrae evolution, probably about 350-400 million years ago, before the separation of the major vertebrate classes.Expand
Photoreceptors in a primitive mammal, the South American opossum, Didelphis marsupialis aurita: characterization with anti-opsin immunolabeling.
The photoreceptor layer of a South American marsupial is studied by peanut agglutinin labeling of the cone sheath and by labeling of cone outer segments with monoclonal anti-visual pigment antibodies that have been proven to consistently label middle-to-long wavelength (COS-1) and short-wavelength (OS-2) cone subpopulations in placental mammals. Expand
Distribution of photoreceptor types in the retina of a marsupial, the tammar wallaby (Macropus eugenii).
Mammalian retinae generally contain low numbers of short-wavelength-sensitive cones (S-cones) and higher numbers of middle- to long-wavelength-sensitive cones (M-cones). Some recent studies foundExpand
Retinal development of West Australian dhufish, Glaucosoma hebraicum
The results imply that the larvae and juveniles of larval and juvenile dhufish are adapted for survival in coastal waters and may be active in relatively low light levels from early stages of development. Expand
The Visual Ecology of Avian Photoreceptors
  • N. Hart
  • Medicine, Biology
  • Progress in Retinal and Eye Research
  • 2001
The primary influence on avian retinal design appears to be the range of wavelengths available for vision, regardless of whether that range is determined by the spectral distribution of the natural illumination or the spectral transmittance of the ocular media. Expand
Spectral sensitivity of photoreceptors in an Australian marsupial, the tammar wallaby (Macropus eugenii)
Microspectrophotometric measurements on the rod photoreceptors of the tammar wallaby showed that they have a peak absorbance at 501 nm, indicating that macropod marsupials have a typical mammalian rhodopsin, and the electroretinogram did not reveal the presence of a short-wavelength-sensitive cone pigment as was expected from behavioural and anatomical data. Expand
Retinal Structure and Visual Acuity in a Polyprotodont Marsupial, the Fat-Tailed Dunnart (Sminthopsis crassicaudata)
The visual system of the fat-tailed dunnart (Sminthopsis crassicaudata), a small polyprotodont marsupial, has been examined both anatomically and behaviourally and visual acuity, estimated from counts of peak ganglion cell density and measurements of posterior nodal distance, was found to be 2.30 cycles per degree. Expand
Visual pigments and oil droplets in the retina of a passerine bird, the canary Serinus canaria: microspectrophotometry and opsin sequences
The visual receptors of the passeriform bird Serinus canaria, the canary, have been examined microspectrophotometrically and the sequences of the opsins determined and mechanisms of spectral tuning within each opsin class are discussed. Expand
The mammalian photoreceptor mosaic-adaptive design
It is attempted to demonstrate that, building on the limits of an ancient rod dominant (probably dichromatic) model, mammalian retinas have developed considerable radiation. Expand
  • G. H. Jacobs
  • Biology, Medicine
  • Biological reviews of the Cambridge Philosophical Society
  • 1993
This review has evaluated the proposition that relatively few mammalian species have a capacity for colour vision in mammals in the light of recent research on colour vision and its mechanisms in mammals and concluded that the baseline mammalian colour vision is argued to be dichromacy. Expand