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from the issue of July 17, 2008
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Southern beetle species moves into Nebraska
BY TOM SIMONS, UNIVERSITY COMMUNICATIONS
As curator of insects at the University of Nebraska State Museum, one of Brett Ratcliffe's jobs is to keep an eye on the kinds of six-legged creatures that live in Nebraska, with a particular interest in his specialty, the scarab beetles.
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| | | Pictured is Lucanis elaphus (giant stag beetle) first found in Nebraska in 2002. It can be found in Indian Cave State Park.
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And what he and his team of entomologists are finding is a changing population, with several southern species of scarabs moving into the state in the last several years. Ratcliffe and his colleague, Matt Paulsen, recently published an updated version of the NU State Museum monograph, "The Scarabaeoid Beetles of Nebraska," in which he and his team document 256 species of scarabs living in Nebraska. That's an increase of 57 species since 1991 when the previous edition of "Scarab Beetles of Nebraska" was published.
"That's quite a dramatic increase, partly because of a different sampling regimen, but also because we are noticing 10 to 12 species that we know were not here in 1991, but that are here now, and these are species that are typically more southern in their distribution," Ratcliffe said.
"We are attributing this to a northward movement of populations due to climate change - in other words, global warming. These are species that are associated with warmer climates than what we had here in, say, 1990, and now they are here."
Ratcliffe said that while similar phenomena with plants and other types of insects have been noted in Europe and in many parts of the United States, it's the first instance he's aware of where the phenomena has been documented for scarab beetles in Nebraska.
"One of the largest scarab beetles in Nebraska now is one of these new animals," Ratcliffe said. "It's a dung beetle by the scientific name of Dichotomius carolinus. It's half again as big as your thumbnail and it's a generalist feeder. It feeds in all kinds of dung, primarily in pastures."
Another example, he said, is the common green June beetle, Cotinis nitida, which is very common in the southeast United States. In 1991, Ratcliffe said there were only three or four records of it in Nebraska. Now, the beetle can be found in abundance along the Missouri River to north of Omaha.
And then there's the elephant stag beetle, the largest stag beetle in the United States at about 2 1/2 inches long. After the 1991 book came out, a teacher in Beatrice found one. Since then, Ratcliffe's team has seen active populations in Indian Cave State Park near Auburn.
"They look ferocious, but they're harmless, as are all scarabs," Ratcliffe said. "They can't physically hurt you. They don't sting or bite and some are of economic importance. Dung beetles are extremely beneficial for removing animal waste from pasturelands. Having natural recyclers like dung beetles is really important to the ecosystem."
The purpose of the new book, Ratcliffe said, is to document all scarab beetles in Nebraska, provide keys for identification (including illustrations), distribution maps and locality records, and discuss the biology and ecology of each species. It will serve as an identification manual for a large user group in the state, including scientists, educators in extension and outreach, 4-H, students studying insects, museum collections managers and a large amateur community of nature watchers. Most of the 256 species are illustrated with photographs and nearly all have distribution maps showing the counties where they occur.
The 570-page book will be available through the NU State Museum. Contact Gail Littrell at (402) 472-2643 or glittrell1@unl.edu. An order form is available online at www.museum.unl.edu/pubs/index.html.
Beetle find is a top 10 new species
| | TOP 10 BEETLE - Pictured is the new rhino beetle species, Megaceras briansaltini, next to Disney/Pixar's beetle Dim.
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Brett Ratcliffe and his team of entomologists at the University of Nebraska State Museum not only find new species of scarab beetle moving into Nebraska, they are also adept at discovering totally new species, especially in the American tropics.
One of their recent discoveries in Peru, the rhinoceros beetle Megaceras briansaltini, was named one of the top 10 new species for 2007 by the International Institute for Species Exploration at Arizona State University. Rhinoceros beetles are named for the horn-like structures on their heads, and M. briansaltini's is unique. According to Ratcliffe and his colleague, Mary Liz Jameson, it most closely resembles that of Dim, the blue rhinoceros beetle in the Disney/Pixar animated film, "A Bug's Life."
"It's a rare instance of nature imitating art," reported the institute's Web site (http://species.asu.edu/topten2008.php).
GO TO: ISSUE OF JULY 17
NEWS HEADLINES FOR JULY 17
Southern beetle species moves into Nebraska
Belashchenko honored for magnet study
Rural residents back renewable energy
Crews survey state's tree resources
Engineering begins cooperative learning with Warsaw University of Technology
Gardening on campus
Grant to promote financial literacy among Nebraska students
Proposals sought for Innovation Campus
UNL, Curtis collaborate on dairy project
Water science focus of Hohai collaboration
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