Navigation Links
Giant squids' giant eyes: The better to see hungry whales with
Date:3/17/2012

It's no surprise that giant and colossal squid are big, but it's their eyes that are the real standouts when it comes to size, with diameters measuring two or three times that of any other animal. Now, researchers reporting online on March 15 in Current Biology, a Cell Press publication, have used complex computations to explain those massive peepers. Giant squids' 10-inch eyes allow them to see very large and hungry sperm whales from a distance in the pitch darkness of their deep-sea home.

According to the researchers' calculations, animals living underwater would have no use for such large eyes if the goal were to see an average object, such as prey smaller than themselves. That's why even the eyes of large whales aren't much more than 3.5 inches across.

"For seeing in dim light, a large eye is better than a small eye, simply because it picks up more light," said Dan-Eric Nilsson of Lund University. "But for animals that live in the sea or in lakes, the optical properties of water will severely restrict how far away things can be seen.

"Through complex computations we have found that for animals living in water, it does not pay to make eyes much bigger than an orange. Making eyes larger than that will only marginally improve vision, but eyes are expensive to build and maintain."

For Nilsson's team, that begged the question of why giant squid bother with their giant eyes. Using a mathematical model of underwater vision, they tested the benefits of very large eyes for a broad range of tasks under various light conditions. Those efforts showed that very large eyes aren't much better than smaller ones unless one wants to see something that is itself very big, like a whale.

Giant squid may also be unique in that they are powerful enough to escape a sperm whale once they've spotted one, Nilsson says. But how can giant squid see a sperm whale at depths beyond daylight's reach?

"The answer is bioluminescencelight produced by small gelatinous animals when they are disturbed by the whale moving through the water," Nilsson says. "It is well known that bioluminescence can reveal submarines at night, and diving sperm whales will become visible for the same reason."

The findings may also explain the large eyes of prehistoric ichthyosaurs, giant marine reptiles that looked something like dolphins, the researchers say. Although ichthyosaurs lived long before whales came along, they would have had to contend with giant predatory pliosaurs.

The new model can also be used to predict how far other animals can see underwater. "It is a powerful tool for understanding vision," Nilsson says.


'/>"/>
Contact: Elisabeth (Lisa) Lyons
elyons@cell.com
617-386-2121
Cell Press
Source:Eurekalert  

Related biology news :

1. 1,000 tags reveal mysteries of giant bluefin tuna
2. Conservation International gets support from Dreamworks Animation to protect giant pandas
3. Discovery of giant roaming deep sea protist provides new perspective on animal evolution
4. Doubling a gene in corn results in giant biomass
5. Tall tale of giant stingray circles the globe
6. Doubling a gene in corn results in giant biomass
7. Scientists rebuild giant moa using ancient DNA
8. Report documents the risks of giant invasive snakes in the US
9. Canopy giants and miniature fungi among 250 new species discovered in Kews 250th anniversary year
10. Microorganism may provide key to combating giant salvinia throughout Louisiana
11. Giant panda genome reveals new insights into the bears bamboo diet
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Giant squids' giant eyes: The better to see hungry whales with
(Date:2/10/2017)... DUBLIN , Feb 10, 2017 ... PharmaBiotech,s new report "Personalized Medicine - Scientific and Commercial ... ... in personalized medicine. Diagnosis is integrated with therapy for selection ... emphasis on early detection and prevention of disease in modern ...
(Date:2/8/2017)... Feb. 7, 2017 The biometrics market ... the confluence of organizations, desires to better authenticate ... systems (password and challenge questions), biometrics is quickly ... systems. The market is driven by use cases, ... consumer and enterprise uses cases, with consumer-facing use ...
(Date:2/6/2017)... 2017 According to Acuity Market Intelligence, ... authorities to continue to embrace biometric and digital ... Automated Border Control (ABC) eGates and 1436 Automated ... than 163 ports of entry across the globe. ... a combined CAGR of 37%. APC Kiosks reached ...
Breaking Biology News(10 mins):
(Date:2/23/2017)... Financial Highlights (in ... Months Ended December 31,Twelve Months Ended December 31,20162015% ... $           300$     ... Revenue 3539(10)%9498(4)%Kuvan Net Product Revenue ... 756025%297303(2)%Vimizim Net Product Revenue ...
(Date:2/23/2017)... 23, 2017 /PRNewswire/ - The Fight Against Cancer Innovation ... (OICR) are pleased to report that Fusion Pharmaceuticals Inc. ... Johnson & Johnson Innovation – JJDC, Inc. (JJDC) as ... HealthCap, TPG Biotechnology Partners, and Genesys Capital, as well ... ...
(Date:2/23/2017)... -- In Atlanta, it seems everyone has a chance to express ... an expressive and dynamic community unlike any other. The businesses ... it. With their newest salon in ... carry on that tradition with a unique, fresh approach to ... is the newest of 13 nationwide locations, each of them ...
(Date:2/23/2017)... , Feb. 23, 2017  Imanis Life ... product line of oncolytic vaccinia viruses for virotherapy ... as part of Genelux,s proprietary, vaccinia virus-based technology ... excited to enter into a partnership with Genelux ... oncolytic vaccinia viruses for use in research," said ...
Breaking Biology Technology: