KSU study examines decline in prairie chicken numbers

21-04-2011 | |

The greater prairie chicken is a declining species across the United States of America, but studies by researchers at Kansas State University may help boost its numbers.

“Kansas has national importance as a stronghold for some of the largest remaining populations of prairie chickens in the United States,” said Brett Sandercock, an associate professor of biology who studies the behavior of the birds.

Sandercock and his research team are especially busy with field work in the spring. It’s mating season for the prairie chickens, which usually arrive at their breeding or booming grounds, also called leks, shortly before dawn and stay only a few hours.

“Right now this means we have to get up at 5 a.m. to arrive at the leks by 6 a.m., with the birds coming in between 6:15 and 6:30 am,” he said. “Prairie chickens will come into the leks in the evenings too, but are usually less active.”

Low egg viability
Prairie chickens have been declining for the past 30 years. Low populations in other states have been linked to inbreeding and low egg viability. “High testosterone levels can increase the chance that a male mates with a female but also may reduce survival through effects on immune function,” Sandercock said.

The researchers will travel long distances in the sometimes harsh spring weather to collect data on the birds.
“The breeding season is a relatively short one-month period and we have to work a lot to capture birds and to record behavioral data,” Sandercock said. “The genetic analyses have required careful attention to detail and optimization of different molecular markers by Samantha Wisely and her students.”

Unusual mating system
Prairie chickens have an unusual mating system, Sandercock said. The males form groups at the leks, which females then visit to select mates. Their selection is based on the males’ behavior in aggressive interactions with other males.
Understanding patterns of mating helps with repopulation management of prairie chickens around the nation.

“Translocations of birds from Kansas are currently being used to re-establish populations of prairie chickens in Missouri,” Sandercock said. “Understanding patterns of mating will help to develop translocation programs and decide how many birds should be moved.”

K-State’s prairie chicken behavioral project has been supported by two grants from the National Science Foundation.

Source: Kansas State University