Cooperative Research Units
Programs L2 Landing Page
Evaluating outcomes of management targeting the recovery of a migratory songbird of conservation concern
Assessing outcomes of habitat management is critical for informing and adapting conservation plans. From 2013 – 2019, a multi-stage management initiative aims to create >25,000 ha of shrubland and early-successional vegetation to benefit Golden-winged Warblers (Vermivora chrysoptera) in managed forested landscapes of the western Great Lakes...Streby, Henry M.; Kramer, Gunnar R.; Peterson, Sean M.; Andersen, David
Are waterfowl food resources limited during spring migration? A bioenergetic assessment of playas in Nebraska's rainwater basin
Accurate bioenergetic carrying capacity estimates of wetlands on public and private lands, as well as those managed for crop production are important for managing waterfowl populations and habitats. Given the importance of wetlands in the Rainwater Basin region of Nebraska for spring migrating waterfowl, we quantified and compared seed and...Schepker, Travis J.; LaGrange, Ted; Webb, Elisabeth B.
Avian response to shade‐layer restoration in coffee plantations in Puerto Rico
Documenting the evolving processes associated with habitat restoration and how long it takes to detect avian demographic responses is crucial to evaluate the success of restoration initiatives and to identify ways to improve their effectiveness. The importance of this endeavor prompted the U.S. Fish and Wildlife Service and the USDA Natural...Irizarry, Amarilys D.; Collazo, Jaime A.; Pacifici, Krishna; Reich, Brian J.; Battle, Kathryn E.
Chasing a changing climate: Reproductive and dispersal traits predict how sessile species respond to global warming
AimStudies of species' range shifts have become increasingly relevant for understanding ecology and biogeography in the face of accelerated global change. The combination of limited mobility and imperilled status places some species at a potentially greater risk of range loss, extirpation or extinction due to climate change. To assess the ability...Archambault, Jennifer M.; Cope, W. Gregory; Kwak, Thomas J.
Genetic population structure of Shoal Bass within their native range
Endemic to the Apalachicola River basin of the southeastern USA, the Shoal Bass Micropterus cataractae is a fluvial‐specialist sport fish that is imperiled because of anthropogenic habitat alteration. To counter population declines, restorative stocking efforts are becoming an increasingly relevant management strategy. However,...Taylor, Andrew T.; Tringali, Michael D.; Sammons, Steven M.; Ingram, Travis R.; O'Rouke, Patrick M.; Peterson, Douglas L.; Long, James M.
Groundwater flux estimation in streams: A thermal equilibrium approach
Stream and groundwater interactions play an essential role in regulating flow, temperature, and water quality for stream ecosystems. Temperature gradients have been used to quantify vertical water movement in the streambed since the 1960s, but advancements in thermal methods are still possible. Seepage runs are a method commonly used to quantify...Zhou, Yan; Fox, Garey A.; Miller, Ron B.; Mollenhauer, Robert; Brewer, Shannon K.
Limited hatchery introgression into wild brook trout (Salvelinus fontinalis) populations despite reoccurring stocking
Due to increased anthropogenic pressures on many fish populations, supplementing wild populations with captive‐raised individuals has become an increasingly common management practice. Stocking programs can be controversial due to uncertainty about the long‐term fitness effects of genetic introgression on wild populations. In particular,...White, Shannon L.; Miller, William L.; Dowell, Stephanie A.; Bartron, Meredith L.; Wagner, Tyler
Neonicotinoid insecticides negatively affect performance measures of non‐target terrestrial arthropods: a meta‐analysis
Neonicotinoid insecticides are currently the fastest‐growing and most widely used insecticide class worldwide. Valued for their versatility in application, these insecticides may cause deleterious effects in a range of non‐target (beneficial) arthropods. However, it remains unclear whether strong patterns exist in terms of their major effects, if...Main, Anson; Webb, Elisabeth B.; Goyne, Keith W.; Mengel, Doreen C.
Small values in big data: The continuing need for appropriate metadata
Compiling data from disparate sources to address pressing ecological issues is increasingly common. Many ecological datasets contain left-censored data – observations below an analytical detection limit. Studies from single and typically small datasets show that common approaches for handling censored data — e.g., deletion or substituting fixed...Stow, Craig A.; Webster, Katherine E.; Wagner, Tyler; Lottig, Noah R.; Soranno, Patricia A.; Cha, YoonKyung
Spatial variability and macro‐scale drivers of growth for native and introduced Flathead Catfish populations
Quantifying spatial variability in fish growth and identifying large‐scale drivers of growth are fundamental to many conservation and management decisions. Although fish growth studies often focus on a single population, it is becoming increasingly clear that large‐scale studies are likely needed for addressing transboundary management needs. This...Massie, Danielle L.; Smith, Geoffrey; Bonvechio, Timothy F.; Bunch, Aaron J.; Lucchesi, David O.; Wagner, Tyler
Factors affecting nesting ecology of Apalone spinifera in a northwestern Great Plains river of the United States
The nesting ecology of Apalone spinifera in large North American rivers is largely unknown despite the wide distribution of the species in these naturally dynamic ecosystems. We describe the nesting locations, timing, behavior, and habitat of A. spinifera in relation to natural and anthropogenic factors in the Missouri River....Tornabene, Brian J.; Bramblett, Robert G.; Zale, Alexander V.; Leathe, Stephen A.
Spatial and temporal patterns in population trends and burrow usage of burrowing owls in North America
Many researchers have suggested that abundance of Burrowing Owls (Athene cunicularia) has declined in many portions of their breeding range, but a thorough review of their population trends over time is lacking. Published population trends from the North American Breeding Bird Survey program suggested that Burrowing Owl populations in the US have...Conway, Courtney J.