Tag Archives: UNL

 Dr. Jack Whittier is the recipient of the 2019 American Society of Animal Science Fellow Award for Extension, presented to him during the opening ceremony of the 2019 ASAS-CSAS Annual Meeting held in Austin, Texas.

Whittier, a 36-year member and 6-year board member of the ASAS, was raised on a livestock and crop farm in Utah and received B.S. and M.S. degrees from Utah State University and a Ph.D. from the University of Nebraska. He has been Director of the University of Nebraska Panhandle Research and Extension Center in Scottsbluff since 2014.

Whittier expressed appreciation for the recognition.

“I am amazed and humbled to be considered in the same classification as the icons of the profession that precede me on this list of Fellows in my profession,” he said.

Prior to UNL, for 28 years, he was an Extension Beef Cattle Specialist at the University of Missouri and later at Colorado State University, focused on beef cow nutrition and reproduction.

He has given several hundred presentations to producer audiences and initiated the Colorado Ranch Practicum, Colorado Nutrition Roundtable, Robert Taylor Memorial Beef Symposium, CSU Beef Team, and AI training schools. He also provided support and leadership for the CSU Integrated Resource Management Program, Western Beef Committee’s Cow/calf Management Guide, Colorado Animal Identification Task Force, eXtension Beef Community of Practice, and Range Beef Cow Symposium.

The ASAS Fellow Award for Extension recognizes a member of ASAS who has rendered very distinguished service to the animal industry and/or to the American Society of Animal Science and had continuous membership in the Society for a minimum of twenty-five years. This award is sponsored by the American Society of Animal Science.

LINCOLN — Whole ecosystems are shifting dramatically north in the Great Plains, a phenomenon likely linked to human influences such as climate change, says new University of Nebraska-Lincoln research that analyzed nearly 50 years’ worth of data on bird distributions.

The northernmost ecosystem boundary shifted more than 365 miles north, with the southernmost boundary moving about 160 miles from the 1970 baseline.

The findings could inform the development of an early-warning system that would give land managers decades to prepare for ecosystem shift or collapse, allowing them to accommodate or foster the change rather than simply reacting, the researchers said.

Early warning, long the siren song for extreme weather events such as tornadoes, is likewise an emerging goal in ecology. Ecologists long thought that ecosystems respond to external pressures — climate changes, invasive species — in idiosyncratic, largely unpredictable ways.

But the team’s new study, published June 24 in the journal Nature Climate Change, managed to quantify the spatial component of that change for the first time. In doing so, it suggests that ecological responses are much more ordered and predictable than previously thought.

“If we can work toward prevention (of changes), we’re going to save ourselves so much money and time,” said Caleb Roberts, lead author and postdoctoral researcher at Nebraska. “We won’t have to worry about specific endangered species, perhaps, because we will be protecting the system they require.”

To arrive at their conclusions, the researchers analyzed 46 years’ worth of avian data collected for the North American Breeding Bird Survey, a U.S. Geological Survey program designed to track bird populations. That survey included more than 400 bird species found within a 250-mile-wide transect stretching from Texas to North Dakota.

The team then separated bird species into groups based on their body masses and searched for gaps in the distribution of the groups. Those gaps effectively act like the DNA signature of an ecosystem, said co-author Craig Allen, allowing the team to identify where one ecosystem ends and another begins.

By analyzing the geographic movement of the distinct body-mass signatures over the 46-year period, the team managed to measure how much and how fast each ecosystem shifted north.

“All (these breaks) are saying is that there are a lot of animals with the small body size; then there’s a gap with nothing in this middle body size; then you have another group and another group,” said Allen, director of the university’s Center for Resilience in Working Agricultural Landscapes. “And since these reflect the domains of scale in an ecosystem, it’s like a signature — the DNA — of a given ecosystem.”

Over their study area, and over time, the researchers identified three distinct ecosystem boundaries, with a fourth — and thus a fourth ecosystem regime — appearing in the final decade.

The fact that the northernmost boundary shifted more than its southernmost counterpart reflects a well-documented phenomenon known as Arctic amplification, suggesting that climate change is at play, the researchers said. But the movement also aligns with other global change drivers that include wildfire trends; the invasion of woody plants such as eastern red cedar trees; energy development; agricultural land conversion; and urbanization.

“Like most things in ecology, (these shifts) likely have multiple causations,” Allen said. “And I think it’s fairly intractable to try to separate, say, tree invasion from climate change, because it has to do with fire but also with changing climate. All of these things are highly related.”

Grasslands are the most endangered ecosystem in the world, Roberts said, partially due to woody-plant encroachment. That encroachment, he said, is something people can work to control by increasing burning, increasing tree removal and decreasing planting.

“Those are all things we can do and use the early warning to say, ‘We’re coming to the edge of this grassland’s resilience. It’s about to collapse, especially in our area. What can we do to stop that?’ That’s the kind of power this tool would have,” he said. “You don’t have to wait until it gets to you. You can see it coming and act pre-emptively.”

When land managers do wait until the problem arrives at their backdoor, Allen said, it’s often too late to alter the outcome. Given that urgency, the researchers plan to expand the range of their ecosystem analysis both east and west — potentially picking up forestlands and mountain ranges — while further clarifying how neighboring ecosystems move in relation to one another and in relation to global drivers.

Eventually, the researchers said, they intend to develop tools usable by land managers and conservationists ranging from private industry to the military.

“We are working closely with a long list of partners to understand how to navigate these types of transitions and increase the performance of conservation investments,” said Dirac Twidwell, associate professor of agronomy and horticulture. “Large-scale transitions should not be underestimated. Restoring what has been lost has proven extraordinarily difficult when the challenge spans large geographic regions.”

The research was conducted with support from the Department of Defense Strategic Environmental Research Development Program; Nebraska Game and Parks Commission; and the University of Nebraska-Lincoln’s Institute of Agriculture and Natural Resources. David Angeler, adjunct professor with the School of Natural Resources and also of the Swedish University of Agricultural Sciences, contributed to the study.

East Central and Southeastern Nebraska Growers

On June 25, larvae suspected to be soybean gall midge were found in soybean plants at the Eastern Nebraska Research and Extension Center near Ithaca. Figure 1 shows a soybean plant with dark discoloration near the soil surface. Dissection of the plant showed orange larvae feeding within these damaged areas.

Photos were also submitted by grower Trevor Houghton showing orange larvae feeding within soybean plants near Nehawka in east central Nebraska. The discovery of these larvae already feeding within the plants closes the window on the likelihood that foliar insecticides will control soybean gall midge in this area. We suggest that growers with fields south of the Eastern Nebraska Research and Extension Center not apply an insecticide, as it is unlikely to have any effect on soybean gall midge. Low levels of emergence are still occurring at some trap locations, but numbers have declined significantly in the past few days.

Northeast Nebraska Growers

No soybean midge larvae were found in soybean plants in northeast Nebraska fields near Randolph and Belden. Insect phenological events here (e.g., corn rootworm egg hatch and adult emergence) are typically one week to 10 days behind the Eastern Nebraska Research and Extension Center (Ithaca), so it is likely that soybean gall midge adults, and possibly larvae just emerging from eggs, are vulnerable to foliar insecticides.

This is a very new pest, and we have no research-based management recommendations; however, because the midge is most frequently an issue along field edges, we have farmer cooperator studies that employ insecticide treatment around the edges of soybean fields. For example, fields receive one pass, 120-foot deep into the soybean field, with an insecticide with residual activity. The objective of such studies is to protect the field from soybean gall midge by preventing the first generation of midges from establishing along the edge of the field. Soybean fields that are adjacent to or very near fields that had high infestations of soybean gall midge in 2018 may benefit from such a foliar insecticide treatment, if application occurs within the next few days. Once most eggs hatch and larvae enter the plant, insecticide treatment will be unlikely to have an effect.

For more information on soybean gall midge in Nebraska, please see cropwatch.unl.edu/tags/soybean-gall-midge.