Featured Research

from universities, journals, and other organizations

Cages and emetics rescue wading birds: Decoy eggs injected with a drug to induce vomiting in predators

Date:
May 13, 2010
Source:
University of Gothenburg
Summary:
The number of waders (shorebirds) in Sweden is falling rapidly. Scientists have tested drastic new methods to protect species such as the Northern lapwing and redshank from predators, including protective cages over their nests and decoy eggs injected with a drug to induce vomiting.

Lapwing in cage to to reduce nest-robbing.
Credit: Image courtesy of University of Gothenburg

The number of waders (shorebirds) in Sweden is falling rapidly. Scientists at the University of Gothenburg have tested drastic new methods to protect species such as the Northern lapwing and redshank from predators, including protective cages over their nests and decoy eggs injected with a drug to induce vomiting.

Populations of shore-breeding wading birds have fallen dramatically in Sweden. One reason is that ground-nesting birds' nests are being robbed by other species. Researcher Daniel Isaksson from the Department of Zoology at the University of Gothenburg has been studying colonies of lapwing and redshank nesting in the coastal meadows of Halland in south-western Sweden for several years.

To reduce nest-robbing, he has tested a number of non-lethal methods to stop the predators. One is to protect the nests by enclosing them in a protective cage, which has had good results.

"Both lapwing and redshank hatched more eggs when their nests were inside the cages," he says. "But this technique works only for species that leave the nest early when a predator is in the vicinity, as species that stay longer risk being trapped and themselves becoming the prey."

Another method tested was to put out artificial nests containing ordinary hens' eggs painted to resemble waders' eggs and injected with an emetic -- a drug that induces vomiting. The idea was to "teach" the predators that waders' eggs are inedible.

"We found that predation of the real waders' eggs immediately decreased during the first three weeks in areas with the decoy eggs, which suggests that the method had an effect."

Isaksson's studies also show that nest-robbing and the positioning of waders' nests are to a great extent governed by the surrounding environment.

"For example, crows like elevated perches such as fences where they can keep watch and avoid attacks by lapwings," he says. "In two out of three years, the lapwings therefore positioned their nests further and further away from such sites. This limits the lapwing's breeding area and probably impacts on the size of the local population."


Story Source:

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


Cite This Page:

University of Gothenburg. "Cages and emetics rescue wading birds: Decoy eggs injected with a drug to induce vomiting in predators." ScienceDaily. ScienceDaily, 13 May 2010. <www.sciencedaily.com/releases/2010/05/100509202650.htm>.
University of Gothenburg. (2010, May 13). Cages and emetics rescue wading birds: Decoy eggs injected with a drug to induce vomiting in predators. ScienceDaily. Retrieved October 22, 2014 from www.sciencedaily.com/releases/2010/05/100509202650.htm
University of Gothenburg. "Cages and emetics rescue wading birds: Decoy eggs injected with a drug to induce vomiting in predators." ScienceDaily. www.sciencedaily.com/releases/2010/05/100509202650.htm (accessed October 22, 2014).

Share This



More Plants & Animals News

Wednesday, October 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Cadaver Dogs Aid Search for More Victims of Suspected Indiana Serial Killer

Cadaver Dogs Aid Search for More Victims of Suspected Indiana Serial Killer

Reuters - US Online Video (Oct. 21, 2014) Police in Gary, Indiana are using cadaver dogs to search for more victims after a suspected serial killer confessed to killing at least seven women. Linda So reports. Video provided by Reuters
Powered by NewsLook.com
White Lion Cubs Unveiled to the Public

White Lion Cubs Unveiled to the Public

Reuters - Light News Video Online (Oct. 21, 2014) Visitors to Belgrade zoo meet a pair of three-week-old lion cubs for the first time. Tara Cleary reports. Video provided by Reuters
Powered by NewsLook.com
'Cadaver Dog' Sniffs out Human Remains

'Cadaver Dog' Sniffs out Human Remains

AP (Oct. 21, 2014) Where's a body buried? Buster's nose can often tell you. He's a cadaver dog, specially trained to find human remains and increasingly being used by law enforcement and accepted in courts. These dogs are helping solve even decades-old mysteries. (Oct. 21) Video provided by AP
Powered by NewsLook.com
White Lion Cubs Born in Belgrade Zoo

White Lion Cubs Born in Belgrade Zoo

AFP (Oct. 20, 2014) Two white lion cubs, an extremely rare subspecies of the African lion, were recently born at Belgrade Zoo. They are being bottle fed by zoo keepers after they were rejected by their mother after birth. Duration: 00:42 Video provided by AFP
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:

Strange & Offbeat Stories


Plants & Animals

Earth & Climate

Fossils & Ruins

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