Charles B Yackulic, Ph.D.
Charles Yackulic is a research statistician with the Southwest Biological Science Center.
Dr. Yackulic's research primarily focuses on developing and fitting statistical models that integrate multiple data sources, link environmental drivers and management actions to population and ecosystem processes, and can be used to make near and long-term forecasting of system dynamics under different management alternatives. Areas of particular interest include species distribution dynamics, population dynamics, interspecific interactions, animal movement, food web dynamics and river metabolism.
Professional Experience
2011-present: Research Statistician, USGS Southwest Biological Science Center, Flagstaff, AZ
2010-2011: National Science Foundation (NSF) postdoc in Bioinformatics, USGS Patuxent Wildlife Research Center, MD
2009-2010: Postdoctoral Researcher, Columbia University, NY
Education and Certifications
2009 - Ph.D. in Ecology and Evolutionary Biology, Columbia University, NY
2003 - MSc. in Environmental Change and Management, Oxford University, UK
2001 - B.A. in Biology (major) and Math (minor), Columbia University, NY
Science and Products
Future soil moisture and temperature extremes imply expanding suitability for rainfed agriculture in temperate drylands
Taxonomic and compositional differences of ground-dwelling arthropods in riparian habitats in Glen Canyon, Arizona, USA
Does bioelectrical impedance analysis accurately estimate the condition of threatened and endangered desert fish species?
Integrating count and detection–nondetection data to model population dynamics
The evolution of different maternal investment strategies in two closely related desert vertebrates
The effects of drought and fire in the extirpation of an abundant semi-aquatic turtle from a lacustrine environment in the southwestern USA
Benefits of the destinations, not costs of the journeys, shape partial migration patterns
Ecosystem implications of conserving endemic versus eradicating introduced large herbivores in the Galapagos Archipelago
Scientific monitoring plan in support of the selected alternative of the Glen Canyon Dam Long-Term Experimental and Management Plan
Animal movement in the absence of predation: environmental drivers of movement strategies in a partial migration system
Competitive exclusion over broad spatial extents is a slow process: Evidence and implications for species distribution modeling
Incorporating temporal heterogeneity in environmental conditions into a somatic growth model
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Future soil moisture and temperature extremes imply expanding suitability for rainfed agriculture in temperate drylands
The distribution of rainfed agriculture is expected to respond to climate change and human population growth. However, conditions that support rainfed agriculture are driven by interactions among climate, including climate extremes, and soil moisture availability that have not been well defined. In the temperate regions that support much of the world’s agriculture, these interactions are complicAuthorsJohn B. Bradford, Daniel R. Schlaepfer, William K. Lauenroth, Charles B. Yackulic, Michael C. Duniway, Sonia A. Hall, Gensuo Jia, Khishigbayar Jamiyansharav, Seth M. Munson, Scott D. Wilson, Britta TietjenTaxonomic and compositional differences of ground-dwelling arthropods in riparian habitats in Glen Canyon, Arizona, USA
The disturbance history, plant species composition, productivity, and structural complexity of a site can exert bottom-up controls on arthropod diversity, abundance, and trophic structure. Regulation alters the hydrology and disturbance regimes of rivers and affects riparian habitats by changing plant quality parameters. Fifty years of regulation along the Colorado River downstream of Glen CanyonAuthorsBarbara Ralston, Neil S. Cobb, Sandra L. Brantley, Jacob Higgins, Charles B. YackulicDoes bioelectrical impedance analysis accurately estimate the condition of threatened and endangered desert fish species?
Bioelectrical impedance analysis (BIA) is a nonlethal tool with which to estimate the physiological condition of animals that has potential value in research on endangered species. However, the effectiveness of BIA varies by species, the methodology continues to be refined, and incidental mortality rates are unknown. Under laboratory conditions we tested the value of using BIA in addition to morphAuthorsKimberly L. Dibble, Micheal D. Yard, David L. Ward, Charles B. YackulicIntegrating count and detection–nondetection data to model population dynamics
There is increasing need for methods that integrate multiple data types into a single analytical framework as the spatial and temporal scale of ecological research expands. Current work on this topic primarily focuses on combining capture–recapture data from marked individuals with other data types into integrated population models. Yet, studies of species distributions and trends often rely on daAuthorsElise F. Zipkin, Sam Rossman, Charles B. Yackulic, David Wiens, James T. Thorson, Raymond J. Davis, Evan H. Campbell GrantThe evolution of different maternal investment strategies in two closely related desert vertebrates
We compared egg size phenotypes and tested several predictions from the optimal egg size (OES) and bet-hedging theories in two North American desert-dwelling sister tortoise taxa, Gopherus agassizii and G. morafkai, that inhabit different climate spaces: relatively unpredictable and more predictable climate spaces, respectively. Observed patterns in both species differed from the predictions of OEAuthorsJoshua R. Ennen, Jeffrey E. Lovich, Roy C. Averill-Murray, Charles B. Yackulic, Mickey Agha, Caleb Loughran, Laura A. Tennant, Barry SinervoThe effects of drought and fire in the extirpation of an abundant semi-aquatic turtle from a lacustrine environment in the southwestern USA
We documented a significant mortality event affecting a southwestern pond turtle (Actinemys pallida) population living in a lake in southern California, USA. The area around the lake was impacted by a large wildland fire in 2013 that occurred during a protracted drought. As the mortality event was still unfolding, we collected data in 2014 on water quality, demographic structure, and short-term suAuthorsJeffrey E. Lovich, Mari Quillman, Brian Zitt, Adam Schroeder, David E. Green, Charles B. Yackulic, Paul Gibbons, Eric GoodeBenefits of the destinations, not costs of the journeys, shape partial migration patterns
1. The reasons that lead some animals to seasonally migrate, and others to remain in the same area year-round, are poorly understood. Associations between traits, such as body size, and migration provide clues. For example, larger species and individuals are more likely to migrate.2. One explanation for this size bias in migration is that larger animals are capable of moving faster (movement hypotAuthorsCharles B. Yackulic, Stephen Blake, Guillaume Bastille-RousseauEcosystem implications of conserving endemic versus eradicating introduced large herbivores in the Galapagos Archipelago
Restoration of damaged ecosystems through invasive species removal and native species conservation is an increasingly common practice in biodiversity conservation. Estimating the degree of ecosystem response attributable specifically to eradication of exotic herbivores versus restoration of native herbivores is often difficult and is complicated by concurrent temporal changes in other factors, espAuthorsGuillaume Bastille-Rousseau, James P. Gibbs, Karl Campbell, Charles B. Yackulic, Stephen BlakeScientific monitoring plan in support of the selected alternative of the Glen Canyon Dam Long-Term Experimental and Management Plan
IntroductionThe purpose of this document is to describe a strategy by which monitoring and research data in the natural and social sciences will be collected, analyzed, and provided to the U.S. Department of the Interior (DOI), its bureaus, and to the Glen Canyon Dam Adaptive Management Program (GCDAMP) in support of implementation of the Glen Canyon Dam Long-Term Experimental and Management PlanAuthorsScott P. Vanderkooi, Theodore A. Kennedy, David J. Topping, Paul E. Grams, David L. Ward, Helen C. Fairley, Lucas S. Bair, Joel B. Sankey, Charles B. Yackulic, John C. SchmidtAnimal movement in the absence of predation: environmental drivers of movement strategies in a partial migration system
Animal movement strategies including migration, dispersal, nomadism, and residency are shaped by broad-scale spatial-temporal structuring of the environment, including factors such as the degrees of spatial variation, seasonality and inter-annual predictability. Animal movement strategies, in turn, interact with the characteristics of individuals and the local distribution of resources to determinAuthorsGuillaume Bastille-Rousseau, James P. Gibbs, Charles B. Yackulic, Jacqueline L. Frair, Fredy Cabrera, Louis-Philippe RousseauCompetitive exclusion over broad spatial extents is a slow process: Evidence and implications for species distribution modeling
There is considerable debate about the role of competition in shaping species distributions over broad spatial extents. This debate has practical implications because predicting changes in species' geographic ranges in response to ongoing environmental change would be simpler if competition could be ignored. While this debate has been the subject of many reviews, recent literature has not addresseAuthorsCharles B. YackulicIncorporating temporal heterogeneity in environmental conditions into a somatic growth model
Evaluating environmental effects on fish growth can be challenging because environmental conditions may vary at relatively fine temporal scales compared to sampling occasions. Here we develop a Bayesian state-space growth model to evaluate effects of monthly environmental data on growth of fish that are observed less frequently (e.g., from mark-recapture data where time between captures can rangeAuthorsMaria C. Dzul, Charles B. Yackulic, Josh Korman, Michael D. Yard, Jeffrey D. Muehlbauer - Web Tools
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