Featured Research

from universities, journals, and other organizations

Best possible night light: Researchers study how light cycles impact zoo animals

Date:
March 15, 2011
Source:
Case Western Reserve University
Summary:
A doctoral student reaches across a Cleveland Metroparks Zoo exhibit with a long pole tipped with a synthetic swab soaked in honey water. A pygmy slow loris, a big-eyed nocturnal primate, climbs down a branch and begins licking and chewing the swab. Something as seemingly innocuous as incorrect lighting may negatively impact the health and reproduction of lorises, pottos and their kin, researchers say.

Grace Fuller, a doctoral student at Case Western Reserve University, reaches across a Cleveland Metroparks Zoo exhibit with a long pole tipped with a synthetic swab soaked in honey water.

A pygmy slow loris, a big-eyed nocturnal primate, climbs down a branch and begins licking and chewing the swab.

"These primates can navigate through a complicated jungle and avoid predators in the dark," said Fuller standing in the loris exhibit at Cleveland Metroparks Zoo. But in captivity, something as seemingly innocuous as incorrect lighting may negatively impact the health and reproduction of lorises, pottos and their kin.

This is crucial in zoos where their days and nights are switched so that the animals are up and moving when patrons come to see them, not after dark when the zoo is closed. Fuller is interested in whether the swap of light cycle negatively impacts these primates.

That kind of switch is rough on other primates: humans.

"Shift workers have higher rates of cancer, heart problems and reproductive problems than the rest of the population," Fuller said.

To examine the question in another light, Fuller is pulling another switch.

"Animals have long been used as models for human research," said Chris Kuhar, curator of Primates and Small Mammals at Cleveland Metroparks Zoo and chair of Nocturnal Prosimian Species Survival Planฎ. "Grace is flipping that, using human research to help animals."

Studies have shown night-shift nurses produce dramatically lower levels of the hormone melatonin, leaving them more susceptible to certain cancers, among other health issues.

Melatonin is an antioxidant and involved in the reproductive cycle and immune system of animals. Called the "hormone of darkness," the chemical is secreted by the pineal gland at night but secretion is suppressed in sunlight.

Human health researchers have used the tiny amount of melatonin in spit as a gauge to determine levels of the hormone present in the body, measuring levels nurses produce while working .

For the lorises and pottos, their daily shift at the zoo is not as dark as nights in the wild, but is gently lighted to enable patrons to see them.

To determine the effect, Fuller's team has developed the first assay to gauge the melatonin level in the spit of zoo primates.

She's also begun trying to gauge the effects of light of different wavelengths and intensities on the animals. Fuller is observing how active the animals are under red, blue and white light and measuring their melatonin levels in each. The least impactful wavelength can be used to illuminate animals for future zoo visitors.

"This is cutting edge research," said Kristen Lukas, an adjunct assistant professor of biology at Case Western Reserve and the curator of Conservation and Science at Cleveland Metropaks Zoo. "No other program is doing this kind of work, linking animal behavior and health to improve animals' lives in zoos."

Video of the research can be seen at: http://www.youtube.com/case#p/a/u/0/7yPiHEmFud0.

Back in its exhibit, the loris finished licking the sweetness away from the swab, leaving its spit behind.

Fuller carries the swab back to the zoo's lab where she uses a centrifuge to separate melatonin from spit and begins her analysis.


Story Source:

The above story is based on materials provided by Case Western Reserve University. Note: Materials may be edited for content and length.


Cite This Page:

Case Western Reserve University. "Best possible night light: Researchers study how light cycles impact zoo animals." ScienceDaily. ScienceDaily, 15 March 2011. <www.sciencedaily.com/releases/2011/03/110310205940.htm>.
Case Western Reserve University. (2011, March 15). Best possible night light: Researchers study how light cycles impact zoo animals. ScienceDaily. Retrieved April 21, 2014 from www.sciencedaily.com/releases/2011/03/110310205940.htm
Case Western Reserve University. "Best possible night light: Researchers study how light cycles impact zoo animals." ScienceDaily. www.sciencedaily.com/releases/2011/03/110310205940.htm (accessed April 21, 2014).

Share This



More Plants & Animals News

Monday, April 21, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Mich. Boy Unearths 10,000-Year-Old Mastodon Tooth

Mich. Boy Unearths 10,000-Year-Old Mastodon Tooth

Newsy (Apr. 20, 2014) — A 9-year-old Michigan boy was exploring a creek when he came across a 10,000-year-old tooth from a prehistoric mastodon. Video provided by Newsy
Powered by NewsLook.com
Vermont Goat Meat Gives Refugees Taste of Home

Vermont Goat Meat Gives Refugees Taste of Home

AP (Apr. 18, 2014) — Dairy farmers and ethnic groups in Vermont are both benefiting from a unique collaborative effort that's feeding a growing need for fresh and affordable goat meat. (April 18) Video provided by AP
Powered by NewsLook.com
Man Claims He Found Loch Ness Monster With... Apple Maps?

Man Claims He Found Loch Ness Monster With... Apple Maps?

Newsy (Apr. 18, 2014) — Andy Dixon showed the Daily Mail a screenshot of what he believes to be the mythical beast swimming just below the lake's surface. Video provided by Newsy
Powered by NewsLook.com
First Ever 'Female Penis' Discovered In Animal Kingdom

First Ever 'Female Penis' Discovered In Animal Kingdom

Newsy (Apr. 18, 2014) — Not only are these newly discovered bugs' sex organs reversed, but they also mate for up to 70 hours. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins