Featured Research

from universities, journals, and other organizations

Restoring grasslands: Ant diversity indicates restored grasslands

Date:
June 9, 2014
Source:
South Dakota State University
Summary:
When it comes to restoring grasslands, ecologists may have another way to evaluate their progress -— ants. The more diverse the ant population, the closer a restored section of grassland is to its original state, according to one expert. When it comes to native grasslands, ants are “ecosystem engineers.”

South Dakota State University graduate student Laura Winkler collects specimens to determine the diversity of ant populations in restored grasslands in eastern South Dakota. Her research will help scientists track the progress of U.S. Fish and Wildlife Services restoration efforts.
Credit: Image courtesy of South Dakota State University

When it comes to restoring grasslands, ecologists may have another way to evaluate their progress -- ants.

The more diverse the ant population, the closer a restored section of grassland is to its original state, according to Laura Winkler, who recently completed her master's degree in plant science, specializing in entomology, at South Dakota State University. When it comes to native grasslands, ants are "ecosystem engineers."

Ecological role of ants

Ants play many ecological roles, Winkler explained. "They aerate the soil, cycle nutrients and play a role in plant defense and seed dispersal. Ants move more soil than earthworms, plus they are food for lots of reptiles and birds."

Some ant species support colonies of plant-feeding insects, such as aphids or plant hoppers, even protecting them from predators. "It's like having dairy cattle," Winkler said. Through this technique, the ants consume the sugar-rich honey dew the aphids secrete, much as humans use cow's milk. When the ants are in need of protein, they simply eat the aphids.

Ants also distribute organic matter by moving dead insects into the colonies and their dead nest mates away from the colonies, Winkler added.

Comparing restored, undisturbed grasslands

Winkler compared tracts of restored grasslands to undisturbed ones at three sites in eastern South Dakota--Sioux Prairie in Minnehaha County, Oak Lake Field Station in Brookings County, and Spirit Mound in Clay County. The U.S. Fish and Wildlife Service manages the restored areas, while the undisturbed area at Sioux Prairie is managed by the Nature Conservancy, Oak Lake by SDSU and Spirit Mound by the S.D. Game, Fish and Parks Department.

Originally from Des Moines, Iowa, she began working with ants as an undergraduate at Iowa State University focusing on how burning and grazing affect species diversity. Her SDSU graduate research assistantship on ant biodiversity and natural history was funded through the Meierhenry Fellowship. Her research adviser was entomologist Paul J. Johnson, professor of plant science.

Variation with age

The U.S. Fish and Wildlife Service sites that had once been crop or pasture land were restored anywhere from one to four years ago, according to Winkler. This involved taking the areas down to the bare ground and then seeding native grasses. Winkler used data from multiple sites taken over a one-year period.

As expected, the younger sites had fewer ant species, with the numbers and diversity increasing over time. The restoration areas at age 1 had seven different species, while at age 2, the number had increased to nine and by age 3 to 10 species, Winkler reported. She expected the fourth year restorations to be even closer to the 17 species present in the undisturbed remnants, but what she saw was a slight decrease to eight species.

"The drought last year and then a wet spring also affects that vegetation, what's going to survive and how many of the ants are out foraging," Winkler pointed out.

She suspects that management techniques may also have played a role. "Some sites may have been burned more frequently," she noted, to control weeds.

"We've got a sneak peek of what can happen," Winkler said, but more long-term research is needed. Based on other research, she anticipates that the restored areas should peak in terms of species diversity within seven to eight years.

Increased specialization

Winkler also looked at how these ant species function. The younger restorations areas tend to have ants that are generalists who can go anywhere, but the older restorations tend to have more specialists, such as soil-dwelling ants, who are more particular about where they live, Winkler explained. The more dominant specialists push out some of the generalists.

"You'll have ants everywhere," she pointed out, but the greater the diversity, the more niches are being filled, and the more successful the restoration effort.


Story Source:

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


Cite This Page:

South Dakota State University. "Restoring grasslands: Ant diversity indicates restored grasslands." ScienceDaily. ScienceDaily, 9 June 2014. <www.sciencedaily.com/releases/2014/06/140609140500.htm>.
South Dakota State University. (2014, June 9). Restoring grasslands: Ant diversity indicates restored grasslands. ScienceDaily. Retrieved September 18, 2014 from www.sciencedaily.com/releases/2014/06/140609140500.htm
South Dakota State University. "Restoring grasslands: Ant diversity indicates restored grasslands." ScienceDaily. www.sciencedaily.com/releases/2014/06/140609140500.htm (accessed September 18, 2014).

Share This



More Plants & Animals News

Thursday, September 18, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Chimp Violence Study Renews Debate On Why They Kill

Chimp Violence Study Renews Debate On Why They Kill

Newsy (Sep. 17, 2014) The study weighs in on a debate over whether chimps are naturally violent or become that way due to human interference in the environment. Video provided by Newsy
Powered by NewsLook.com
Some Tobacco Farmers Thrive Amid Challenges

Some Tobacco Farmers Thrive Amid Challenges

AP (Sep. 16, 2014) The South's tobacco country is surviving, and even thriving in some cases, as demand overseas keeps growers in the fields of one of America's oldest cash crops. (Sept. 16) Video provided by AP
Powered by NewsLook.com
Scientists Given Rare Glimpse of 350-Kilo Colossal Squid

Scientists Given Rare Glimpse of 350-Kilo Colossal Squid

AFP (Sep. 16, 2014) Scientists say a female colossal squid weighing an estimated 350 kilograms (770 lbs) and thought to be only the second intact specimen ever found was carrying eggs when discovered in the Antarctic. Duration: 00:47 Video provided by AFP
Powered by NewsLook.com
Raw: Scientists Examine Colossal Squid

Raw: Scientists Examine Colossal Squid

AP (Sep. 16, 2014) Squid experts in New Zealand thawed and examined an unusual catch on Tuesday: a colossal squid. It was captured in Antarctica's remote Ross Sea in December last year and has been frozen for eight months. (Sept. 16) Video provided by AP
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