Navigation Links
Ecologists get fish eye view of sexual signals

Carotenoid pigments are the source of many of the animal kingdom's most vivid colours; flamingos' pink feathers come from eating carotenoid-containing shrimps and algae, and carotenoid colours can be seen among garden birds in blackbirds' orange beaks and blue tits' yellow breast feathers.

These pigments play a crucial role in sexual signals. According to the study's lead author Dr Tom Pike of the University of Exeter: "Females typically use carotenoid colours to assess the quality of a potential mate, with more colourful males generally being regarded as the most attractive."

This long-held assumption is, however, hard to study because we see colour very differently to fish and previous studies have not taken such differences into account, instead comparing only the colours perceived by humans.

"The major difference between stickleback vision and our own is that they can see ultraviolet light, which is invisible to humans. This may be important because carotenoids reflect ultraviolet light as well as the red, oranges and yellows that we can see," Dr Pike explains.

The model developed by Dr Pike and colleagues from the University of Glasgow and Nofima Marine in Norway mimics the stickleback's visual system, allowing the researchers to determine what 'colours' the fish see. "The model tells us how much of the light reflected from a carotenoid signal is actually detected by a female and how this information might be processed by her brain, and so gives us exciting new insights into how females may use colour to choose the best mates," says Dr Pike.

Male sticklebacks can fine tune the colours they display to females by varying both the overall amount of carotenoids and the relative amount of the two constituent carotenoids, the red-coloured astaxanthin and the yellow tunaxanthin. The model reveals that sticklebacks' visual system and coloration are extremely well co-adapted, and that females are surprisingly good at assessing the quantity of carotenoids a male is able to put in his signal which previous studies by the authors have shown is linked to his parenting ability.

The results will help ecologists get a better understanding of why carotenoid-based signals evolved in the first place, and provides insights into why males use the specific carotenoids they do. According to Dr Pike: "There are many carotenoids in the sticklebacks' diet, but males use only two of them for signalling; because the visual system evolved long before male coloration in this species, it suggests that males 'chose' to use those two carotenoids to make the most of what the female fish sees."


Contact: Dr. Tom Pike

Related biology news :

1. Ecologists find new clues on climate change in 150-year-old pressed plants
2. Ecologists to discuss impacts of mountaintop mining at special ESA symposium
3. Ecologists receive mixed news from fossil record
4. Nations largest organization of ecologists offers expert database
5. Ecologists discover forests are growing faster
6. Ecologists sound out new solution for monitoring cryptic species
7. The value of variation: Ecologists consider the causes and consequences
8. Ecologists question effects of climate change on infectious diseases
9. Ecologists report quantifiable measures of natures services to humans
10. Ecologists use oceanographic data to predict future climate change
11. Ecologists say metabolism accounts for why natural selection favors only some species
Post Your Comments:
(Date:10/29/2015)... 29, 2015 Daon, a global leader in ... released a new version of its IdentityX Platform ... North America have already installed IdentityX v4.0 ... a FIDO UAF certified server component as ... activate FIDO features. These customers include some of the ...
(Date:10/29/2015)... , Oct. 29, 2015  Connected health pioneer, ... the explosion of technology-enabled health and wellness, and the ... book, The Internet of Healthy Things ... or smartphones even existed, Dr. Kvedar, vice president, Connected ... health care delivery, moving care from the hospital or ...
(Date:10/29/2015)... , Oct. 29, 2015 Today, ... a partnership with 2XU, a global leader in ... a smart hat with advanced bio-sensing technology. The ... athletes to monitor key biometrics to improve overall ... partnership, the two companies will bring together the most ...
Breaking Biology News(10 mins):
(Date:11/24/2015)... ... November 24, 2015 , ... The United States Golf ... the 2016 USGA Green Section Award. Presented annually since 1961, the USGA Green Section ... her work with turfgrass. , Clarke, of Iselin, N.J., is an extension ...
(Date:11/24/2015)... ... November 24, 2015 , ... International Society for Pharmaceutical Engineering ... premier annual events for pharmaceutical manufacturing: 2015 Annual Meeting. The conference took place ... the largest number of attendees in more than a decade. , “The ...
(Date:11/24/2015)... ... 2015 , ... The Academy of Model Aeronautics (AMA), led by its Executive ... Multirotor Grand Prix, to represent the First–Person View (FPV) racing community. , FPV racing ... this type of racing and several new model aviation pilots have joined the community ...
(Date:11/24/2015)... SAN FRANCISCO , Nov. 24, 2015 /PRNewswire/ ... today announced that Emily Leproust, Ph.D., Twist Bioscience ... Piper Jaffray Healthcare Conference on December 1, 2015 ... Palace Hotel in New York City. ... . Twist Bioscience is on ...
Breaking Biology Technology: