scholarly journals Rhodopsin population genetics and local adaptation: variable dim-light vision in sand gobies is illuminated

2009 ◽  
Vol 18 (20) ◽  
pp. 4140-4142 ◽  
Author(s):  
DANIEL EBERT ◽  
ROSE L. ANDREW
Keyword(s):  
Population Genetics ◽  
Local Adaptation ◽  
Dim Light ◽  
Adaptation Variable ◽  
Dim Light Vision

Dim light vision of Squilla mantis L

1963 ◽  
Vol 205 (5) ◽  
pp. 927-940 ◽  
Author(s):  
H. Schiff
Keyword(s):  
Light Intensity ◽  
Mediterranean Sea ◽  
Environmental Conditions ◽  
Green Fluorescence ◽  
Fiber Analysis ◽  
Near Ultraviolet ◽  
Intensity Changes ◽  
Dim Light ◽  
Dim Light Vision ◽  
Shape And Size

The anatomy of the eye of Squilla mantis and the geometrical optics derived from it are briefly described. The shape and size of the electroretinogram (ERG) are dependent on a) position where it is picked up, b) the light intensity, and c) the change of intensity. Single-fiber analysis confirms the results obtained by the anatomy and the ERG of the eye. Frequency of response of a single secondary fiber to intensity changes of light is proportional to the derivate dI/dt ( I = intensity; t = time). The Squilla sees a moving object as the sum of the intensity changes caused by that object, varied in time and space. The eyes have a maximum of sensitivity for light of 535–555 mµ wavelength, and a second maximum in the near ultraviolet light, the latter partly seen as green fluorescence due to an eye pigment. Anatomy, physiology, and the environmental conditions have been combined to explain the vision of this animal, adapted to his life in the blue-violet twilight of the deeper Mediterranean sea.

The molecular origin and evolution of dim-light vision in mammals

Evolution ◽  
2015 ◽  
Vol 69 (11) ◽  
pp. 2995-3003 ◽  
Author(s):  
Constanze Bickelmann ◽  
James M. Morrow ◽  
Jing Du ◽  
Ryan K. Schott ◽  
Ilke van Hazel ◽  
...  
Keyword(s):  
Origin And Evolution ◽  
Molecular Origin ◽  
Dim Light ◽  
Dim Light Vision

scholarly journals A Cambrian origin for vertebrate rods

eLife ◽  
2015 ◽  
Vol 4 ◽  
Author(s):  
Sabrina Asteriti ◽  
Sten Grillner ◽  
Lorenzo Cangiano
Keyword(s):  
Common Ancestor ◽  
Selective Pressure ◽  
Single Photons ◽  
Last Common Ancestor ◽  
Rod Photoreceptor ◽  
Multiple Parameters ◽  
Retinal Photoreceptors ◽  
Functional Features ◽  
Dim Light ◽  
Dim Light Vision

Vertebrates acquired dim-light vision when an ancestral cone evolved into the rod photoreceptor at an unknown stage preceding the last common ancestor of extant jawed vertebrates (∼420 million years ago Ma). The jawless lampreys provide a unique opportunity to constrain the timing of this advance, as their line diverged ∼505 Ma and later displayed high-morphological stability. We recorded with patch electrodes the inner segment photovoltages and with suction electrodes the outer segment photocurrents of Lampetra fluviatilis retinal photoreceptors. Several key functional features of jawed vertebrate rods are present in their phylogenetically homologous photoreceptors in lamprey: crucially, the efficient amplification of the effect of single photons, measured by multiple parameters, and the flow of rod signals into cones. These results make convergent evolution in the jawless and jawed vertebrate lines unlikely and indicate an early origin of rods, implying strong selective pressure toward dim-light vision in Cambrian ecosystems.

scholarly journals Advances and limits of using population genetics to understand local adaptation

2014 ◽  
Author(s):  
Peter Tiffin ◽  
Jeffrey Ross-Ibarra
Keyword(s):  
Population Genetics ◽  
Local Adaptation ◽  
Population Genetic ◽  
Genetic Basis ◽  
Quality Data ◽  
Important Process ◽  
High Quality Data ◽  
Genetic Analyses ◽  
Population Genetic Analyses ◽  
Key Questions

Local adaptation is an important process shaping within species diversity. In recent years, population genetic analyses, which complement organismal approaches in advancing our understanding of local adaptation have become widespread. Here we focus on using population genetics to address some key questions in local adaptation: What traits are involved? What environmental variables are most important? Does local adaptation target the same genes in related species? Do loci responsible for local adaptation exhibit tradeoffs across environments? After discussing these questions we highlight important limitations to population genetic analyses including challenges with obtaining high quality data, deciding which loci are targets of selection, and limits to identifying the genetic basis of local adaptation.

Retinal adaptation to dim light vision in spectacled caimans ( Caiman crocodilus fuscus ): Analysis of retinal ultrastructure

2018 ◽  
Vol 173 ◽  
pp. 160-178 ◽  
Author(s):  
Anett Karl ◽  
Silke Agte ◽  
Astrid Zayas-Santiago ◽  
Felix N. Makarov ◽  
Yomarie Rivera ◽  
...  
Keyword(s):  
Caiman Crocodilus ◽  
Retinal Adaptation ◽  
Dim Light ◽  
Dim Light Vision

scholarly journals Molecular evidence for dim-light vision in the last common ancestor of the vertebrates

2006 ◽  
Vol 16 (9) ◽  
pp. R318-R319 ◽  
Author(s):  
Davide Pisani ◽  
Samantha M. Mohun ◽  
Simon R. Harris ◽  
James O. McInerney ◽  
Mark Wilkinson
Keyword(s):  
Common Ancestor ◽  
Molecular Evidence ◽  
Last Common Ancestor ◽  
Dim Light ◽  
Dim Light Vision
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