Natural Resources and Conservation Commons^™

Modeling Gross Primary Production Of Midwestern Us Maize And Soybean Croplands With Satellite And Gridded Weather Data, Gunnar Malek-Madani, Elizabeth A. Walter-Shea, Anthony Nguy-Robertson, Andrew E. Suyker, Timothy J. Arkebauer

School of Natural Resources: Faculty Publications

Gross primary production (GPP) is a useful metric for determining trends in the terrestrial

carbon cycle. To estimate daily GPP, the cloud-adjusted light use efficiency model (LUEc) was developed by adapting a light use efficiency (LUE, ε) model to include in situ meteorological data and biophysical parameters. The LUEc uses four scalars to quantify the impacts of temperature, water stress, and phenology on ε. This study continues the original investigation in using the LUEc, originally limited to three AmeriFlux sites (US-Ne1, US-Ne2, and US-Ne3) by applying gridded meteorological data sets and remotely sensed green leaf area index (gLAI) to estimate …

Literature Review: Global Neonicotinoid Insecticide Occurrence In Aquatic Environments, Josephus F. Borsuah, Tiffany L. Messer, Daniel D. Snow, Steve D. Comfort, Aaron R. Mittelstet

School of Natural Resources: Faculty Publications

Neonicotinoids have been the most commonly used insecticides since the early 1990s. Despite their efficacy in improving crop protection and management, these agrochemicals have gained recent attention for their negative impacts on non-target species such as honeybees and aquatic invertebrates. In recent years, neonicotinoids have been detected in rivers and streams across the world. Determining and predicting the exposure potential of neonicotinoids in surface water requires a thorough understanding of their fate and transport mechanisms. Therefore, our objective was to provide a comprehensive review of neonicotinoids with a focus on their fate and transport mechanisms to and within surface waters …

Uncovering Unique Plasticity In Life History Of An Endangered Centenarian Fish, Martin J. Hamel, Jonathan J. Spurgeon, Kirk D. Steffensen, Mark A. Pegg

School of Natural Resources: Faculty Publications

the ability to adapt to changing environments is fundamental for species persistence. Both plasticity and genetic selection are potential drivers that allow for traits to be advantageous, thus leading to increases in survival or fitness. Identifying phenotypic plasticity in life history traits of long-lived organisms can be difficult owing to high survival, long generation times, and few studies at sufficient spatial and temporal scales to elicit a plastic response within a population. to begin to understand phenotypic plasticity of a long-lived freshwater fish in response to environmental conditions, we used a long-term data set consisting of over 1,200 mark-recapture events …

Catfish Population Characteristics Among River Segments With Altered Fluvial Geomorphic Conditions In The Missouri River, Nebraska, Usa, Martin J. Hamel, Jonathan J. Spurgeon, Mark A. Pegg

School of Natural Resources: Faculty Publications

Alteration of river systems around the world has created novel environments that have been fragmented, homogenized, or transformed from their natural state, thus posing challenges for understanding how fish populations function. The Missouri River has undergone significant alteration through reservoir construction and channelization. Channel Catfish Ictalurus punctatus and Flathead Catfish Pylodictis olivaris both reside in various fragmented sections of the river, and there is a substantial gap in knowledge of how catfishes synchronously function in this modified system. From 2009 to 2018, we assessed catfishes with baited hoop nets and low-frequency electrofishing among four different areas: upper and lower unchannelized …

Panarchy: Opportunities And Challenges For Ecosystem Management, Ahjond Garmestani, Dirac Twidwell, David G. Angeler, Shana Sundstrom, Chris Barichievy, Brian C. Chaffin, Tarsha Eason, Nick Graham, Dean Granholm, Lance Gunderson, Melinda Knutson, Kirsty L. Nash, R John Nelson, Magnus Nystrom, Trisha L. Spanbauer, Craig A. Stow, Craig R. Allen

School of Natural Resources: Faculty Publications

Addressing unexpected events and uncertainty represents one of the grand challenges of the Anthropocene, yet ecosystem management is constrained by existing policy and laws that were not formulated to deal with today’s accelerating rates of environmental change. In many cases, managing for simple regulatory standards has resulted in adverse outcomes, necessitating innovative approaches for dealing with complex social–ecological problems. We highlight a project in the US Great Plains where panarchy – a conceptual framework that emerged from resilience – was implemented at project onset to address the continued inability to halt large-scale transition from grass-to-tree dominance in central North America. …

Camera Traps Detect Prey Of Northern Carnivores, David A. Keiter, Brent R. Patterson, Carol Dersch, Bob Elliott, Arthur R. Rodgers, John F. Benson

School of Natural Resources: Faculty Publications

Use of camera traps for non-invasive data collection is increasingly common in wildlife studies. This technique presents a valuable, but generally unexploited, opportunity to learn about carnivore diet through direct observations of predators with prey. To highlight this potential, we present a collection of photographic observations from Michipicoten Island, ON, Canada, that improve our knowledge of the diets of northern carnivores. These include the first documentation of Vulpes vulpes (Red Fox) consumption of a Colaptes auratus (Northern Flicker) and the first photographic evidence of wintertime consumption of a Lithobates sp. (frog) by a Mustela erminea (Short-tailed Weasel). We discuss the …

Survival And Competing Mortality Risks Of Mountain Lions In A Major Metropolitan Area, John F. Benson, Jeff A. Sikich, Seth P.D. Riley

School of Natural Resources: Faculty Publications

Understanding natural and human-caused mortality for top predators persisting in human-dominated landscapes is critical for conserving their populations. We estimated survival and cause-specific mortality rates and investigated factors influencing mortality risk of mountain lions by radio-tracking 58 individuals (33 males, 25 females) across the highly fragmented landscape in greater Los Angeles, California from 2002 to 2019. Mortality risk did not differ strongly between subadults (annual survival [ŝ]=0.68, SE=0.08) and adults (ŝ=0.81, SE=0.04). However, the different age-classes were subjected to mortality risks from different sources as subadults were more likely to be killed by conspecifics, whereas adults were more likely to …

Cigarette Butt Disposal Behavior: A Case Study Of A Public Beach On Jekyll Island, Georgia, Usa, Maranda R. Miller, Mark E. Burbach

School of Natural Resources: Faculty Publications

Improperly discarded cigarette butts are a substantial environmental problem. This study explored factors influencing cigarette butt discarding behavior on a public beach on Jekyll Island, Georgia, USA. A mixed-mode design utilized quantitative and qualitative data to study improper cigarette butt disposal. We surveyed smokers regarding their place attachment, environmental attitudes, environmental awareness, and habit as predictors of improper cigarette butt disposal. Environmental attitudes, environmental awareness, and habits were significant predictors of improper cigarette butt disposal behavior. A qualitative inquiry further explored the phenomenon of cigarette butt disposal from the smokers’ perspectives. Interviews illustrated that “improper disposers” experienced themes involving uncertainty …

Nutrient Cycling In Forage Production Systems, David A. Wedin, Michael P. Russelle

School of Natural Resources: Faculty Publications

In most forage production systems, the nutrients needed for plant growth are provided by the microbially-mediated breakdown and release of plant-available mineral nutrients from dead plant tissues, livestock excreta, soil organic matter, and geochemically-bound mineral forms. Even in fertilized forage systems, determining appropriate fertilizer or manure application rates requires a “systems” approach on the part of the manager (Rotz et al. 2005; Wood et al. 2012). Fertilizer additions are simply one input in the system of inputs, outputs, pools, and fluxes that characterize nutrient cycling in a particular ecosystem.

Decoding The Corn Field: Building Third-Grade Students’ Ideas About Plant Inheritance And Variation, D. Cisterna, E. Ingram, D. Bhattacharya, R. Roy, C. Forbes

School of Natural Resources: Faculty Publications

No abstract provided.

Carbon And Nitrogen Recycling During Cyanohabs In Dreissenid-Invaded And Non-Invaded Us Midwestern Lakes And Reservoirs, Trinity L. Hamilton, Jessica Corman, Jeff R. Havig

School of Natural Resources: Faculty Publications

Lakes and reservoirs play key roles in global carbon cycling, especially as a carbon sink. Enrichment of nutrients in lakes and reservoirs (eutrophication) and rising global temperatures favors the proliferation of bloom-forming cyanobacteria. Harmful blooms of cyanobacteria (cyanoHABs) alter carbon and nutrient cycling in freshwater ecosystems. Some evidence suggests the introduction or establishment of invasive mussel species (i.e., Dreissena spp.) also favor cyanoHAB formation through selective filter feeding, a process through which they may also impact biogeochemical processes including carbon cycling and sequestration. However, few studies have considered the combined effects of invasive mussels and cyanoHABs on carbon and nitrogen …

Whose Ground Truth Is It? Harvesting Lessons From Missouri’S 2018 Bumper Crop Of Drought Observations, Kelly Helm Smith, Mark E. Burbach, Michael J. Hayes, A. Tyre, Patrick E. Guinan, Brian Fuchs, Tonya Haigh, Mark D. Svoboda

School of Natural Resources: Faculty Publications

No abstract provided.

Lessons Learned From The 2017 Flash Drought Across The U.S. Northern Great Plains And Canadian Prairies, A. Hoell, B. Fuchs, D. Kluck, L. Edwards, J. Perlwitz, J. Eischeid, V. Deheza, R. Pulwarty, K. Bevington

School of Natural Resources: Faculty Publications

No abstract provided.

Patterns Of Inquiry-Based Science Instruction And Student Science Achievement In Pisa 2015, Cory Forbes, Knut Neumann, Anja Schiepe-Tiska

School of Natural Resources: Faculty Publications

Scientific literacy is a central aim of science education. The Programme for International Student Assessment (PISA) provides a measure of secondary students’ scientific literacy and reported science instruction in 72 countries. Researchers have analyzed PISA data to identify important relationships between science instruction and students’ science achievement. The purpose of this study is to further explore these relationships by using PISA 2015 data from a sample of 13 participating countries representing a range of mean science achievement. We use Latent Profile Analysis (LPA) to explore how students from highest- and lowest-performing profiles characterize the inquiry-based science instruction they experience. We …

Transient Streambed Hydraulic Conductivity In Channel And Bar Environments, Loup River, Nebraska, J. Korus, W.P. Fraundorfer, T. Gilmore, K. Karnik

School of Natural Resources: Faculty Publications

No abstract provided.

Drought Management Norms: Is The Middle East And North Africa (Mena) Region Managing Risks Or Crises?, T. Jedd, C. Knutson, M. Hayes, M. Svoboda, S. Fragaszy, M. Belhaj Fraj, R. Mcdonnell

School of Natural Resources: Faculty Publications

No abstract provided.

Czech Drought Monitor System For Monitoring And Forecasting Of Agricultural Drought And Drought Impacts, Miroslav Trnka, Petr Hlavinka, Martin Možný, Daniela Semerádová, Petr Štěpánek, Jan Balek, Lenka Bartošová, Pavel Zahradníček, Monika Bláhová, Petr Skalák, Aleš Farda, Michael Hayes, Mark D. Svoboda, Wolfgang Wagner, Josef Eitzinger, Milan Fischer, Zdeněk Zalud

School of Natural Resources: Faculty Publications

The awareness of drought and its impacts on Central Europe increased after the significant drought episodes in 2000, 2003, 2012 and 2015, which were all estimated to have caused over 500 million Euro in damage in the Czech Republic alone. These events indicated the need for timely and highresolution monitoring tools that would enable analysing, monitoring and forecasting of drought events. Monitoring soil water availability in near real time and at high-resolution (up to 0.5 × 0.5 km for some products) helps farmers and water managers to mitigate impacts of these extreme events. The Czech Drought Monitor was developed between …

Ecotour Guide Training Program Characteristics And Methods: A Case Study From The African Bush, N.Q. Lackey, L. Pennisi

School of Natural Resources: Faculty Publications

No abstract provided.

Peregrine Falcon Survival Rates Derived From A Long-Term Study At A Migratory And Overwintering Area In Coastal Washington, D.E. Varland, L.A. Powell, J.B. Buchanan, T.L. Fleming, C. Vanier

School of Natural Resources: Faculty Publications

No abstract provided.

Effects Of Liberalizing Harvest Regulations On Canada Goose (Branta Canadensis) Demography In Nebraska, T. Lyons, L. Powell, M. Vrtiska

School of Natural Resources: Faculty Publications

No abstract provided.