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- Adaptive management (2)
- Nebraska (2)
- Uncertainty (2)
- Agro-forested landscape (1)
- Bayesian hierarchical model (1)
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- Body mass (1)
- Brood (1)
- Cervus elaphus (1)
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- Conservation Reserve Program (1)
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- False-negative errors (1)
- Gap rarity index (1)
- Generalized additive models (GAM) (1)
- Generalized linear models (GLM) (1)
- Grassland habitat (1)
- Indeterminism (1)
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- Info-gap (1)
- Information-gap analysis (1)
- Information-gap decision theory (1)
- Logistic exposure (1)
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Articles 1 - 14 of 14
Full-Text Articles in Physical Sciences and Mathematics
Turning Students Into Problem Solvers, Larkin Powell, Andrew Tyre, Michael Conroy, James Peterson, B. Williams
Turning Students Into Problem Solvers, Larkin Powell, Andrew Tyre, Michael Conroy, James Peterson, B. Williams
Andrew J Tyre
In the popular movie Apollo 13, based on the actual NASA mission, three astronauts are stranded in space, their craft’s electrical system broken, their oxygen quickly running out. To help them fix the problem and return home safely, mission controllers summon a group of engineers, dump a pile of equipment onto a desk—the tools available to the astronauts—and tell them to find a solution, or more specifically, “a way to put a square peg in a round hole. Rapidly.” Eventually, the engineers’ plan saves the day, and the astronauts make it home. State and federal agency biologists generally do not …
Finding The Smoothest Path To Success: Model Complexity And The Consideration Of Nonlinear Patterns In Nest-Survival Data, Max Post Van Der Burg, Larkin A. Powell, Andrew J. Tyre
Finding The Smoothest Path To Success: Model Complexity And The Consideration Of Nonlinear Patterns In Nest-Survival Data, Max Post Van Der Burg, Larkin A. Powell, Andrew J. Tyre
Andrew J Tyre
Quantifying patterns of nest survival is a first step toward understanding why birds decide when and where to breed. Most studies of nest survival have relied on generalized linear models (GLM) to explore these patterns. However, GLMs require assumptions about the models’ structure that might preclude finding nonlinear patterns in survival data. Generalized additive models (GAM) provide a flexible alternative to GLMs for estimating linear and nonlinear patterns in data. Here we present a comparison of GLMs and GAMs for explaining variation in nest-survival data. We used two different model-selection criteria, the Bayes (BIC) and Akaike (AIC) information criteria, to …
Resource Selection By Elk In An Agro-Forested Landscape Of Northwestern Nebraska, David M. Baasch, Justin W. Fischer, Scott E. Hygnstrom, Kurt C. Vercauteren, Andrew J. Tyre, Joshua J. Millspaugh, James W. Merchant, Jerry D. Volesky
Resource Selection By Elk In An Agro-Forested Landscape Of Northwestern Nebraska, David M. Baasch, Justin W. Fischer, Scott E. Hygnstrom, Kurt C. Vercauteren, Andrew J. Tyre, Joshua J. Millspaugh, James W. Merchant, Jerry D. Volesky
Andrew J Tyre
In recent years, elk have begun recolonizing areas east of the Rocky Mountains that are largely agroforested ecosystems composed of privately owned land where management of elk is an increasing concern due to crop and forage depredation and interspecific disease transmission. We used a Geographic Information System, elk use locations (n = 5013), random locations (n = 25,065), discrete-choice models, and information-theoretic methods to test hypotheses about elk resource selection in an agro-forested landscape located in the Pine Ridge region of northwestern Nebraska, USA. Our objectives were to determine landscape characteristics selected by female elk and identify publicly owned land …
Indirect Evidence Of Density-Dependent Population Regulation In Aponomma Hydrosauri (Acari: Ixodidae), An Ectoparasite Of Reptiles, Andrew J. Tyre, C. Michael Bull, Brigitte Tenhumberg, Neil Chilton
Indirect Evidence Of Density-Dependent Population Regulation In Aponomma Hydrosauri (Acari: Ixodidae), An Ectoparasite Of Reptiles, Andrew J. Tyre, C. Michael Bull, Brigitte Tenhumberg, Neil Chilton
Andrew J Tyre
The extent to which density-dependent processes regulate natural populations is the subject of an ongoing debate. We contribute evidence to this debate showing that density-dependent processes influence the population dynamics of the ectoparasite Aponomma hydrosauri (Acari: Ixodidae), a tick species that infests reptiles in Australia. The first piece of evidence comes from an unusually long-term dataset on the distribution of ticks among individual hosts. If density-dependent processes are influencing either host mortality or vital rates of the parasite population, and those distributions can be approximated with negative binomial distributions, then general host– parasite models predict that the aggregation coefficient of …
Confronting Socially Generated Uncertainty In Adaptive Management, Andrew J. Tyre, Sarah Michaels
Confronting Socially Generated Uncertainty In Adaptive Management, Andrew J. Tyre, Sarah Michaels
Andrew J Tyre
As more and more organizations with responsibility for natural resource management adopt adaptive management as the rubric in which they wish to operate, it becomes increasingly important to consider the sources of uncertainty inherent in their endeavors. Without recognizing that uncertainty originates both in the natural world and in human undertakings, efforts to manage adaptively at the least will prove frustrating and at the worst will prove damaging to the very natural resources that are the management targets. There will be more surprises and those surprises potentially may prove at the very least unwanted and at the worst devastating. We …
A Test Of The Cross-Scale Resilience Model: Functional Richness In Mediterranean-Climate Ecosystems, Donald A. Wardwell, Craig R. Allen, Garry D. Peterson, Andrew J. Tyre
A Test Of The Cross-Scale Resilience Model: Functional Richness In Mediterranean-Climate Ecosystems, Donald A. Wardwell, Craig R. Allen, Garry D. Peterson, Andrew J. Tyre
Andrew J Tyre
Ecological resilience has been proposed to be generated, in part, in the discontinuous structure of complex systems. Environmental discontinuities are reflected in discontinuous, aggregated animal body mass distributions. Diversity of functional groups within body mass aggregations (scales) and redundancy of functional groups across body mass aggregations (scales) has been proposed to increase resilience. We evaluate that proposition by analyzing mammalian and avian communities of Mediterranean-climate ecosystems. We first determined that body mass distributions for each animal community were discontinuous. We then calculated the variance in richness of function across aggregations in each community, and compared observed values with distributions created …
Estimating Nest Density When Detectability Is Incomplete: Variation In Nest Attendance And Response To Disturbance By Western Meadowlarks, Matthew Giovanni, Max Post Van Der Burg, Lars Anderson, Larkin Powell, Walter H. Schacht, Andrew Tyre
Estimating Nest Density When Detectability Is Incomplete: Variation In Nest Attendance And Response To Disturbance By Western Meadowlarks, Matthew Giovanni, Max Post Van Der Burg, Lars Anderson, Larkin Powell, Walter H. Schacht, Andrew Tyre
Andrew J Tyre
Researchers commonly model nest density as a function of ecological variables, but nests, like birds, can be undetected while present. In the Nebraska Sandhills in 2007, we used the rope-drag method on previously located Western Meadowlark (Sturnella neglecta) nests to model nest-detection error and nest density. Detecting nests by rope dragging (commonly used for nests of grassland birds) is conditional on two primary sources of nest availability, adults attending nests and adults flushing from nests in response to disturbance from the rope, the behavioral cue necessary for nest detection. On the basis of our trials with rope dragging, the probability …
Planning For Robust Reserve Networks Using Uncertainty Analysis, Atte Moilanen, Michael C. Runge, Jane Elith, Andrew Tyre, Yohay Carmel, Eric Fegraus, Brendan A. Wintle, Mark Burgman, Yakov Ben-Haim
Planning For Robust Reserve Networks Using Uncertainty Analysis, Atte Moilanen, Michael C. Runge, Jane Elith, Andrew Tyre, Yohay Carmel, Eric Fegraus, Brendan A. Wintle, Mark Burgman, Yakov Ben-Haim
Andrew J Tyre
Planning land-use for biodiversity conservation frequently involves computer-assisted reserve selection algorithms. Typically such algorithms operate on matrices of species presence–absence in sites, or on species-specific distributions ofmodel predicted probabilities of occurrence in grid cells. There are practically always errors in input data—erroneous species presence–absence data, structural and parametric uncertainty in predictive habitat models, and lack of correspondence between temporal presence and long-run persistence. Despite these uncertainties, typical reserve selection methods proceed as if there is no uncertainty in the data or models. Having two conservation options of apparently equal biological value, one would prefer the option whose value is relatively …
Probabilistic Movement Model With Emigration Simulates Movements Of Deer In Nebraska, 1990–2006, Charles J. Frost, Scott E. Hygnstrom, Andrew J. Tyre, Kent M. Eskridge, David M. Baasch, Justin R. Boner, Gregory M. Clements, Jason M. Gilsdorf, Travis C. Kinsell, Kurt C. Vercauteren
Probabilistic Movement Model With Emigration Simulates Movements Of Deer In Nebraska, 1990–2006, Charles J. Frost, Scott E. Hygnstrom, Andrew J. Tyre, Kent M. Eskridge, David M. Baasch, Justin R. Boner, Gregory M. Clements, Jason M. Gilsdorf, Travis C. Kinsell, Kurt C. Vercauteren
Andrew J Tyre
Movements of deer can affect population dynamics, spatial redistribution, and transmission and spread of diseases. Our goal was to model the movement of deer in Nebraska in an attempt to predict the potential for spread of chronic wasting disease (CWD) into eastern Nebraska. We collared and radio-tracked >600 white-tailed deer (Odocoileus virginianus) and mule deer (Odocoileus hemionus) in Nebraska during 1990–2006.We observed large displacements (>10 km) for both species and sexes of deer, including migrations up to 100 km and dispersals up to 50 km. Average distance traveled between successive daily locations was 166m for …
Evaluating The Efficacy Of Adaptive Management Approaches: Is There A Formula For Success?, Jamie E. Mcfadden, Tim L. Hiller, Andrew J. Tyre
Evaluating The Efficacy Of Adaptive Management Approaches: Is There A Formula For Success?, Jamie E. Mcfadden, Tim L. Hiller, Andrew J. Tyre
Andrew J Tyre
Within the field of natural-resources management, the application of adaptive management is appropriate for complex problems high in uncertainty. Adaptive management is becoming an increasingly popular management-decision tool within the scientific community and has developed into two primary schools of thought: the Resilience-Experimentalist School (with high emphasis on stakeholder involvement, resilience, and highly complex models) and the Decision-Theoretic School (which results in relatively simple models through emphasizing stakeholder involvement for identifying management objectives). Because of these differences, adaptive management plans implemented under each of these schools may yield varying levels of success. We evaluated peer-reviewed literature focused on incorporation of …
Nest And Brood Survival And Habitat Selection Of Ring-Necked Pheasants And Greater Prairie-Chickens In Nebraska, Ty Matthews
Nest And Brood Survival And Habitat Selection Of Ring-Necked Pheasants And Greater Prairie-Chickens In Nebraska, Ty Matthews
Andrew J Tyre
Ring-Necked Pheasant (Phasianus colchicus) and Greater Prairie-chicken (Tympanuchus cupido pinnatus) populations have declined in the Midwest since the 1960’s. Research has suggested decreased nest and brood survival are the major causes of this decline due to the lack of suitable habitat. Habitat degradation has been attributed to the shift to larger crop fields, lower diversity of crops, and more intensive pesticide and herbicide use. A primary goal of the Conservation Reserve Program (CRP) is to mitigate the loss of wildlife habitat. Early research found that CRP increased the amount of suitable nesting and brood rearing cover for both species but …
Wilderness Serendipity: Planning And Assessing Learning During An Experiential Field Course, Larkin A. Powell, Andrew J. Tyre, Scott E. Hygnstrom, David A. Wedin, P.R. Hanson, Mark S. Kuzila, James B. Swinehart
Wilderness Serendipity: Planning And Assessing Learning During An Experiential Field Course, Larkin A. Powell, Andrew J. Tyre, Scott E. Hygnstrom, David A. Wedin, P.R. Hanson, Mark S. Kuzila, James B. Swinehart
Andrew J Tyre
Experiential learning opportunities promote skill in problem-solving and critical thinking, but they require unique assessment methods because traditional approaches are difficult to implement in the field. We have conducted a study tour course involving a canoe trip in a wilderness area in northern Minnesota since 2004. Here, we describe how we developed our course's learning experiences, ensured the learning experiences materialized, and assessed the student learning objectives. Proper planning can result in valuable, spontaneous learning experiences. We used a student journal, field-based quiz, and participation grade to effectively assess the breadth of student learning that was inherent in our course. …
Chapter Thirteen- Habitat Selection And Brood Survival Of Greater Prairie-Chickens, Ty W. Matthews, Andrew J. Tyre, J. Scott Taylor, Jeffery J. Lusk, Larkin A. Powell
Chapter Thirteen- Habitat Selection And Brood Survival Of Greater Prairie-Chickens, Ty W. Matthews, Andrew J. Tyre, J. Scott Taylor, Jeffery J. Lusk, Larkin A. Powell
Andrew J Tyre
The Greater Prairie-Chicken (Tympanuchus cupido pinnatus) is a species that may benefit from conversion of crop ground to grassland through the Conservation Reserve Program (CRP). CRP grasslands could provide nesting and brood-rearing habitat, an important component of population persistence. Managers and policymakers currently lack evidence of CRP’s relative contribution to populations of Greater Prairie-Chicken. We used radiotelemetry to mark females (n =100) in southeast Nebraska, in a landscape which had >15% of land area enrolled in CRP. We examined macrohabitat and microhabitat selection of brood-rearing females (n=36) using discrete choice models, and examined the variability in brood survival using logistic …
Integrating Info-Gap Decision Theory With Robust Population Management: A Case Study Using The Mountain Plover, Max Post Van Der Burg, Andrew J. Tyre
Integrating Info-Gap Decision Theory With Robust Population Management: A Case Study Using The Mountain Plover, Max Post Van Der Burg, Andrew J. Tyre
Andrew J Tyre
Wildlife managers often make decisions under considerable uncertainty. In the most extreme case, a complete lack of data leads to uncertainty that is unquantifiable.Information-gap decision theory deals with assessing management decisions under extreme uncertainty, but it is not widely used in wildlife management. So too, robust population management methods were developed to deal with uncertainties in multiple-model parameters.However, the two methods have not, as yet, been used in tandem to assess population management decisions. We provide a novel combination of the robust population management approach for matrix models with the information-gap decision theory framework for making conservation decisions under extreme …