Navigation Links
Behavioral studies show UV contributes to marsupial color vision

Work reported this week provides new evidence that marsupials, like primates, have functional color vision based on three different types of color photoreceptor cones--but unlike primates, a component of marsupial color vision includes sensitivity to ultraviolet wavelengths.

In the study, researchers employed behavioral tests to show that at least one type of marsupial uses its detection of UV light as part of its ability to discriminate between colors. The new work is reported by a group including Dr. Catherine Arrese of the University of Western Australia and appears in the March 21st issue of Current Biology.

The most prevalent system of color vision in mammals is known as dichromacy, which is a color-detection system based on two types of cone photoreceptors--those sensitive to short (SWS) and medium-to-long (M/LWS) wavelengths. Trichromacy, which is used by humans, was thought to be unique to primates that have re-evolved a third cone type from the duplication of the MWS/LWS gene, which enables the discrimination of green-red colors. But the researchers' previous physiological studies in Australian marsupials provided original evidence for the potential of trichromatic color vision in mammals other than primates. The findings were consistent in several distantly related marsupial species, indicating that the presence of three spectrally distinct cone types, sensitive to short (SWS), medium (MWS), and long (LWS) wavelengths, is a common feature of Australian marsupials. However, since evidence of color vision cannot be derived from physiological studies alone, marsupial trichromacy remained to be established with an unequivocal behavioural approach.

In the new study, the researchers therefore investigated the contribution of the distinct cone types to color vision in the fat-tailed dunnart (Sminthopsis crassicaudata), using additive color mixture experiments in which choice between a colored light (training wavelength) and an additive mi xture of two different colored lights (primary wavelengths) is based exclusively on differences in chromatic content. The results revealed that the fat-tailed dunnart possesses functional trichromacy, but that its version of trichromatic vision differs from that of primates in that it includes sensitivity to UV wavelengths. In addition to furthering our knowledge of how mammalian color vision functions, the findings provide an opportunity to re-examine theories on the evolution of this key sensory capacity.


'"/>

Source:Cell Press


Related biology news :

1. New studies suggest airborne SARS transmission is possible
2. Two studies document rise of superbugs in the environment
3. UI researcher studies deafness in fruit flies, humans
4. Biased reporting found in cancer prognostic studies
5. Fruit fly studies open new window on cancer research
6. Why do aneurysms form? New studies suggest leading role for white blood cells
7. Bare metal stents deliver gene therapy to heart vessels with less inflammation in animal studies
8. Diabetes researchers pioneer islet cell xenotransplantation in primate studies
9. Pair of studies offer new clues to combat antibiotic resistance
10. New RNAi tools enable systematic studies of gene function
11. Ernst Mayrs theory illustrated in genetic epidemiology studies
Post Your Comments:
*Name:
*Comment:
*Email:


(Date:4/19/2016)... , UAE, April 20, 2016 ... implemented as a compact web-based "all-in-one" system solution for ... biometric fingerprint reader or the door interface with integration ... modern access control systems. The minimal dimensions of the ... readers into the building installations offer considerable freedom of ...
(Date:3/31/2016)...   LegacyXChange, Inc. ... LegacyXChange is excited to release its first ... be launched online site for trading 100% guaranteed authentic ... also provide potential shareholders a sense of the value ... industry that is notorious for fraud. The video is ...
(Date:3/22/2016)... PROVO and SANDY, ... Screening Ontario (NSO), which operates the highest sample volume ... testing, and Tute Genomics and UNIConnect, leaders in clinical ... today announced the launch of a project to establish ... testing panel. NSO has been contracted ...
Breaking Biology News(10 mins):
(Date:4/28/2016)... , ... April 28, 2016 , ... ... will deliver a talk on its first-in-class technologies for tissue stem cell ... Meeting on RNAiMicroRNA Biology to Reprogramming & CRISPR-based Genome Engineering in Burlington, ...
(Date:4/27/2016)... ... 2016 , ... Cambridge Semantics, the leading provider of Smart Data ... has been named to The Silicon Review’s “20 Fastest Growing Big Data Companies of ... serves the needs of end users facing some of the most complex data challenges ...
(Date:4/27/2016)... ... April 27, 2016 , ... Most consumers ... with fingerprint recognition for secure access, voice recognition for hands-free communication, and facial ... are interacting with biometrics technology today. But if they asked Joey Pritikin, ...
(Date:4/27/2016)... British Virgin Islands (PRWEB) , ... April 27, ... ... Holding Company Ltd. (d/b/a Biohaven) is pleased to announce the appointment of John Tilton ... he was an Executive Director and one of the founding commercial leaders responsible ...
Breaking Biology Technology: