Beetle may pack a big punch in curbing salt cedar


March 31, 2011

Non-native vegetation’s infiltration to the greater Southwest has caused its share of ecosystem concerns over the years. Now Heather Bateman is looking at the effectiveness of some of the methods employed to help control invasive species, especially salt cedar, along the Virgin River.

Salt cedar or Tamarisk, a non-native tree of Eurasian/African origin, is a deciduous shrub or small tree that was first brought to the western United States in the early 1800s. The Virgin River, which flows from Zion National Park in Utah through the northwest corner of Arizona into northeastern Nevada where it empties into Lake Mead, is overwhelmed with salt cedar where it can have detrimental effects on native plants and habitat quality.

“A healthy riparian ecosystem will have a diverse range of vegetation,” says Bateman, assistant professor in the Department of Applied Sciences and Mathematics in the College of Technology and Innovation at ASU’s Polytechnic campus. “Salt cedar is a concern because it can grow in dense single species plant populations, displacing native plants and altering wildlife habitat.” Download Full Image

Bateman studies riparian ecosystems, the vegetated area along rivers and streams where land meets water. She studies how wildlife populations respond to habitat alteration, with a particular interest in amphibians, reptiles, small mammals and birds.

Though riparian ecosystems take up a small part of the landscape, they are important because many wildlife species will use these zones at some point in their life cycle for foraging, nesting and commuting.

To combat the salt cedar invasion along the Virgin River, natural resource managers opted to use a form of biocontrol in 2006 rather than chemical, mechanical or burning methods. So what is the biocontrol method? A leaf beetle, which is a specialist herbivore or native enemy, has been introduced as biological control of salt cedar.

“The beetle forages along the stems of the tree and causes it to drop its leaves, thus controlling the salt cedar population,” Bateman says.

Although some biologists feel that biocontrol is a better control option than the use of chemicals or prescribed burning, it still could have consequences. Despite the widespread application of the leaf beetle, only limited research has described the benefits or cost to native riparian communities. It is these consequences Bateman plans to study in collaboration with other scientists from the U.S. Geological Survey, University of California-Santa Barbara and Northern Arizona University. 

The beetles are slowly making their way down the river, and Bateman sees this as an excellent opportunity to get a before-and-after look at the riparian ecosystem.

Because Bateman and her colleagues were able to establish study sites prior to leaf beetle establishment, she will be able to collect data along the river prior to the beetles’ arrival and after their departure. She uses capture-mark-release methods to track amphibian, reptile and small mammal populations.

This before-and-after study will allow her to make observations about the effects the beetles have on the riparian ecosystem, which will be helpful to natural resource managers to balance the need to conserve native habitats and species with weed control.

“I want my results to be meaningful to natural resource managers and to provide them with information that allows them to make the best land management decisions they can,” Bateman says.

Although some researchers are focused specifically on bird populations, this project is likely the first attempt to document the impacts of beetle biocontrol on small wildlife communities. Depending upon funding, Bateman and her colleagues hope to collect data along the Virgin River for many years.

Media Contact(s):
Christine Lambrakis, 480/727-1173, 602/316-5616, lambrakis">mailto:lambrakis@asu.edu">lambrakis@asu.edu

Former track and field student-athlete awarded NCAA Postgraduate Scholarship


March 31, 2011

Former Arizona State University track and field student-athlete Lawrence">http://thesundevils.cstv.com/sports/c-track/mtt/trice_lawrence00.html">L... Trice has been awarded a $6,000 scholarship from the NCAA, the Association announced today. Trice was among 26 recipients who won the award as part of the NCAA's Ethnic Minority and Women's Enhancement Postgraduate Scholarship for Careers in Athletics Program.

The goal of the program is to increase opportunities for minority and female candidates in intercollegiate athletics. Scholarships are awarded to 13 ethnic minorities and 13 women who must be seeking admission or who have been accepted into a program that will help them obtain a career in the field. Download Full Image

Trice graduated from ASU in 2010 as a Mountain Pacific Sports Federation All-Academic honoree. After transferring from Cal State Fullerton in 2009, Trice found his feet as a Sun Devil. He competed in all three sprints on the year and placed 12th in the 100m and 200m events at the Pac-10 Championships. Trice ran on both relay teams at the NCAA Championships.

In his first race of the 2010 indoor season, Trice recorded a time of 6.66 in the 60m dash to take home first place. The time ranked as the fourth-best all-time in ASU history and ranked him for seventh-best in the nation for the 2010 indoor season.

Currently, Trice attends graduate school at ASU and competes for the AAG Sports Academy post-collegiate track and field club in Tempe.