Resco de Dios, V., J.F. Weltzin, W. Sun, T.E. Huxman and D.G. Williams. 2014. Transitions from grassland to savanna under drought via passive facilitation by grasses. Journal of Vegetation Science 25:937–946. DOI: 10.1111/jvs.12164
Jake F Weltzin
Jake joined the US Geological Survey in 2007 to design and implement the USA National Phenology Network. Since 2015 he has also served as the Program Manager for the Status & Trends Program in the Ecosystems Mission Area.
Biography
Jake’s interest in natural history developed as he grew up in Alaska and served as an exchange student in the Australian outback. His interests range broadly -- from natural resource management to ecological- and ecosystem-level research -- across a variety of systems ranging from deserts to grasslands, savannas to forests, and even to wetlands.
Career History and Highlights
Post-doctoral Fellowship at University of Notre Dame
Associate Professor, University of Tennessee
Program Director, National Science Foundation
Executive Director, USA National Phenology Network
Program Manager, Status & Trends Program, US Geological Survey
Education
B.S., Colorado State University
M.S., Texas A&M University
Ph.D., University of Arizona
Research Interests
Jake is interested in how the structure and function of plant and animal populations, communities and ecosystems respond to global environmental change, including atmospheric chemistry, climate change, and biological invasions. He also studies how scientists understand and describe changes in ecosystems over space and time, from monitoring, to data management and analysis, to delivery of ecological knowledge and information to stakeholders. Current interests include citizen science, enterprise tools for monitoring, data visualization and delivery, and ecological forecasting.
Science and Products
Date published: October 1, 2017
Status: Active Developing APIs to support enterprise level monitoring using existing tools
In this age of rapidly developing technology, scientific information is constantly being gathered across large spatial scales. Yet, our ability to coordinate large-scale monitoring efforts depends on development of tools that leverage and integrate multiple sources of data. North American bats are experiencing unparalleled population declines. The North American Bat Monitoring Program (NABat...
Attribution: Community for Data Integration (CDI)
Date published: May 24, 2016
Pollinators and Monarchs
Pollinators are crucial contributors to our environment and society by enhancing plant diversity in wild lands and providing food for humans in agricultural settings. Some three-fourths of all native plants in the world require pollination by an animal, most often an insect, and most often a native bee.
Attribution: Ecosystems, Status and Trends Program
Date published: May 24, 2016
NABat: North American Bat Monitoring Program
North American bats face unprecedented threats including habitat loss and fragmentation, white-nose syndrome, wind energy development, and climate change. NABat is an international interagency program designed to monitor bat distributions and abundances on public and private lands, and provide trend data at the state, provincial, tribal, regional, and range-wide scales.
Attribution: Ecosystems, Status and Trends Program
Date published: May 24, 2016
WLCI: Wyoming Landscape Conservation Initiative
WLCI is a long-term, science-based program focused on assessing, conserving, and enhancing fish and wildlife habitats while facilitating responsible energy development through local collaboration and partnerships. We provide multidisciplinary scientific and technical information to WLCI partners and work to advance the overall scientific understanding of ecosystems in southwestern Wyoming.
Attribution: Ecosystems, Status and Trends Program
Date published: May 24, 2016
NPN: The USA National Phenology Network
The USA National Phenology Network is a national-scale science and monitoring initiative focused on phenology, which is the study of seasonal life-cycle events such as leafing, flowering, reproduction and migration, as a tool to understand how plants, animals and landscapes respond to environmental variation and change.
Attribution: Ecosystems, Status and Trends Program
Date published: May 24, 2016
BBS: North American Breeding Bird Survey
With 2015 marking its 50th anniversary, the BBS continues to provide critical science-based estimates of population change on more than 600 continental bird species annually to improve our understanding of how these federally entrusted species respond to environmental variation and ecosystem change.
Attribution: Ecosystems, Status and Trends Program
Date published: March 3, 2016
Status: Active Integration of Phenological Forecast Maps for Assessment of Biodiversity: An Enterprise Workflow
Recent open data policies of the Office of Science and Technology Policy (OSTP) and Office of Management and Budget (OMB), which were fully enforceable on October 1, 2016, require that federally funded information products (publications, etc.) be made freely available to the public, and that the underlying data on which the conclusions are based must be released. A key and relevant aspect of...
Contacts: Jake F Weltzin
Attribution: Community for Data Integration (CDI)
Date published: January 1, 2016
Status: Active Incorporating USGS Web Cameras into the Phenocam Network to Enhance Scientific Understanding of Phenological Trends and Variability
The USA National Phenology Network (USA-NPN) and the North Central Climate Science Center (NC CSC) seek to enhance scientific understanding of how climate trends and variability are linked to phenology across spatial scales, with the ultimate goal of being able to understand and predict climate impacts on natural resources. A key step towards achieving this long-term goal is connecting local...
Contacts: Jake F Weltzin
Attribution: Climate Adaptation Science Centers
Date published: April 7, 2015
Status: Active Geocaching Natural Features - Applying Game Mechanics to Citizen Science Data Collection
ScienceCache is a scientific geocaching mobile application framework that targets two user groups for citizen science data collection: youth and geocachers. By melding training and games into the hunt for place-based data collection sites and incorporating photo uploads as data and authentication, new volunteers can collaborate in robust data collection. Scientists build a project on the...
Attribution: Community for Data Integration (CDI)
Date published: January 28, 2014
Status: Active Webinar: The USA National Phenology Network: Informing Science, Conservation and Resource Management
View this webinar to learn more about the USA National Phenology Network.
Contacts: Jake F Weltzin
Attribution: Climate Adaptation Science Centers
Year Published: 2020
Climate change effects on biodiversity, ecosystems, ecosystem services, and natural resource management in the United States
Climate change is a pervasive and growing global threat to biodiversity and ecosystems. Here, we present the most up-to-date assessment of climate change impacts on biodiversity, ecosystems, and ecosystem services in the U.S. and implications for natural resource management. We draw from the 4th National Climate Assessment to summarize observed...
Weiskopf, Sarah R.; Rubenstein, Madeleine A.; Crozier, Lisa; Gaichas, Sarah; Griffis, Roger; Halofsky, Jessica E.; Hyde, Kimberly J. W.; Morelli, Toni Lyn; Morisette, Jeffrey T.; Muñoz, Roldan C.; Pershing, Andrew J.; Peterson, David L.; Poudel, Rajendra; Staudinger, Michelle D.; Sutton-Grier, Ariana E.; Thompson, Laura; Vose, James; Weltzin, Jake F.; Whyte, Kyle Powys
Year Published: 2020
Short-term forecasts of insect phenology inform pest management
Insect pests cost billions of dollars per year globally, negatively impacting food crops and infrastructure, and contributing to the spread of disease. Timely information regarding developmental stages of pests can facilitate early detection and control, increasing efficiency and effectiveness. In 2018, the U.S. National Phenology Network (USA-NPN...
Crimmins, Theresa M.; Gerst, Katharine L.; Huerta, Diego; Marsh, R. Lee; Posthumus, Erin E.; Rosemartin, Alyssa H.; Switzer, Jeff R.; Weltzin, Jake F.; Coop, Len; Dietschler, Nicholas; Herms, Daniel A.; Limbu, Samita; Trotter III, R. Talbot; Whitmore, MarkAttribution: Wildlife Program
Year Published: 2019
2018 USA National Phenology Annual Report
This report provides a very high-level summary of some of the USA-NPN’s accomplishments over the past year. The purpose is to share with USA-NPN funders, partners, and the general public the value of the organization.
Weltzin, Jake F.; Crimmins, Theresa M.Attribution: Wildlife Program
Year Published: 2019
Pheno forecasts predict seasonal activity of pest and invasive species to support decision making
The USA National Phenology Network’s Pheno Forecast maps indicate the status of insect pest or invasive plant life cycle stages in real time across the contiguous United States. This information can guide when to monitor or to undertake management activities. These maps, available at 2.5 km spatial resolution, are updated daily and are available...
Crimmins, Theresa M.; Gerst, Katharine L.; Posthumus, Erin E.; Rosemartin, Alyssa; Weltzin, Jake F.Attribution: Ecosystems, Wildlife Program
Year Published: 2018
Ecosystems, Ecosystem Services, and Biodiversity
Biodiversity—the variety of life on Earth—provides vital services that support and improve human health and well-being. Ecosystems, which are composed of living things that interact with the physical environment, provide numerous essential benefits to people. These benefits, termed ecosystem services, encompass four primary functions: provisioning...
Reidmiller, David; Avery, C. W.; Easterling, D. R.; Kunkel, K. E.; Lewis, K. L. M.; Maycock, T. K.; Stewart, B. C.; Lipton, Douglas; Rubenstein, Madeleine A.; Weiskopf, Sarah R.; Carter, Shawn L.; Peterson, Jay; Crozier, Lisa; Fogarty, Michael; Gaichas, Sarah; Hyde, Kimberly J. W.; Morelli, Toni Lyn; Morisette, Jeffrey; Moustahfid, Hassan; Munoz, Roldan; Poudel, Rajendra; Staudinger, Michelle D.; Stock, Charles; Thompson, Laura; Waples, Robin S.; Weltzin, Jake F.Attribution: Office of Science Quality and Integrity
Year Published: 2018
Differential changes in the onset of spring across US National Wildlife Refuges and North American migratory bird flyways
Warming temperatures associated with climate change can have indirect effects on migratory birds that rely on seasonally available food resources and habitats that vary across spatial and temporal scales. We used two heat-based indices of spring onset, the First Leaf Index (FLI) and the First Bloom Index (FBI), as proxies of habitat change for the...
Waller, Eric K.; Crimmins, Theresa M.; Walker, Jessica J.; Posthumus, Erin E.; Weltzin, Jake F.Attribution: Wildlife Program
View Citation
Waller, Eric K. , Theresa M. Crimmins, Jessica J. Walker, Erin E. Posthumus, and Jake F. Weltzin. 2018. Differential changes in the onset of spring across US National Wildlife Refuges and North American migratory bird flywayshttps://doi.org/10.1371/journal.pone.0202495
Year Published: 2018
National Park Service and the USA National Phenology Network
Understanding the seasonal cycles of plants and animals, how they are changing, and how they can inform management, operations, and interpretation is critical to the mission of the National Park Service (NPS): to preserve unimpaired the natural and cultural resources and values of the National Park System for the enjoyment, education, and...
Weltzin, Jake F.; Crimmins, Theresa M.; Posthumus, Erin E.; Rosemartin, AlyssaAttribution: Wildlife Program
View Citation
USA-NPN, 2018. National Park Service and the USA National Phenology Network. USA-NPN Information Sheet. https://usanpn.org/files/shared/nps-2018.pdf
Year Published: 2018
USA National Phenology Network supports decision making
The USA National Phenology Network is a federally-funded, nationalscale science and monitoring initiative focused on phenology as a tool to understand how plants, animals, and landscapes respond to environmental variation and change.
Weltzin, Jake F.; Crimmins, Theresa M.; Posthumus, Erin E.; Rosemartin, AlyssaAttribution: Wildlife Program
View Citation
USA-NPN, 2018. USA National Phenology Network supports decision making. USA-NPN Information Sheet. https://www.usanpn.org/files/npn/reports/USA-NPN-decision-making.pdf
Year Published: 2018
Phenology forecasts predict pest seasonal activity to support decision making
The USA National Phenology Network (USANPN) produces and distributes daily national phenology maps – or Pheno Forecasts – indicating when key pest species may be most susceptible to management as part of a growing suite of phenology map products. The USA-NPN’s Pheno Forecast maps show when key pest species, including emerald ash borer (Agrilus...
Weltzin, Jake F.; Crimmins, Theresa M.; Posthumous, Erin; Rosemartin, Alyssaa; Gerst, Katharine L.Attribution: Wildlife Program
Year Published: 2018
MonitoringResources.org—Supporting coordinated and cost-effective natural resource monitoring across organizations
Natural resource managers who oversee the Nation’s resources require data to support informed decision-making at a variety of spatial and temporal scales that often cross typical jurisdictional boundaries such as states, agency regions, and watersheds. These data come from multiple agencies, programs, and sources, often with their own methods and...
Bayer, Jennifer M.; Scully, Rebecca A.; Weltzin, Jake F.Attribution: Biology and Ecosystems, Ecosystems, Status and Trends Program, Wildlife Program, United States of America
View Citation
Bayer, J.M., Scully, R.A., and Weltzin, J.F., 2018, MonitoringResources.org—Supporting coordinated and cost-effective natural resource monitoring across organizations: U.S. Geological Survey Fact Sheet 2018–3015, 2 p., https://doi.org/10.3133/fs20183015.
Year Published: 2018
USA National Phenology Network observational data documentation
The goals of the USA National Phenology Network (USA-NPN, www.usanpn.org) are to advance science, inform decisions, and communicate and connect with the public regarding phenology and species’ responses to environmental variation and climate change. The USA-NPN seeks to advance the science of phenology and facilitate ecosystem stewardship by...
Rosemartin, Alyssa H.; Denny, Ellen G.; Gerst, Katharine L.; Marsh, R. Lee; Posthumus, Erin E.; Crimmins, Theresa M.; Weltzin, Jake F.View Citation
Rosemartin, A., Denny, E.G., Gerst, K.L., Marsh, R.L., Posthumus, E.E., Crimmins, T.M., and Weltzin, J.F., 2018, USA National Phenology Network observational data documentation: U.S. Geological Survey Open-File Report 2018–1060, 24 p., https://doi.org/10.3133/ofr20181060.
Year Published: 2018
A science products inventory for citizen-science planning and evaluation
Citizen science involves a range of practices involving public participation in scientific knowledge production, but outcomes evaluation is complicated by the diversity of the goals and forms of citizen science. Publications and citations are not adequate metrics to describe citizen-science productivity. We address this gap by contributing a...
Wiggins, Andrea; Bonney, Rick; LeBuhn, Gretchen; Parrish, Julia K.; Weltzin, Jake F.Attribution: Wildlife Program
View Citation
Wiggins, Andrea, Rick Bonney, Gretchen LeBuhn, Julia K Parrish, and Jake F Weltzin; 2018. A Science Products Inventory for Citizen-Science Planning and Evaluation, BioScience, , biy028, https://doi.org/10.1093/bioscience/biy028
Pre-USGS Publications
Resco de Dios, V., J.F. Weltzin, W. Sun, T.E. Huxman, and D.G. Williams. 2012. Windows of opportunity for Prosopis velutina seedling establishment and encroachment in a semiarid grassland. Perspectives in Plant Ecology, Evolution and Systematics 14:275-282. DOI: 10.1016/j.ppees.2012.03.002
Souza, L. J.F. Weltzin, and N.J. Sanders. 2011. Differential effects of two dominant plant species on community structure and invasibility in an old-field ecosystem. Journal of Plant Ecology 4:123-131. DOI: 10.1093/jpe/rtq027
Souza, L., W.A. Bunn, J.F. Weltzin, and N.J. Sanders. 2011. Similar biotic factors affect early establishment and abundance of an invasive plant species across spatial scales. Biological Invasions 13:255-267. DOI: 10.1007/s10530-010-9805-9
Kardol, P., C.E. Campany, L. Souza, R.J. Norby, J.F. Weltzin and A.T. Classen. 2010. Climate change effects on plant biomass alter dominance patterns and community evenness in an experimental old-field ecosystem. Global Change Biology 16:2676–2687. DOI: 10.1111/j.1365-2486.2010.02162.x
Souza, L., R.T. Belote, P. Kardol, J.F. Weltzin and R.J. Norby. 2010. CO2 enrichment accelerates successional development of an understory plant community. Journal of Plant Ecology 3:33-39. DOI: 10.1093/jpe/rtp032
Classen, A.T., R.J. Norby, C.E. Campany, K.E. Sides, and J.F. Weltzin. 2010. Climate change alters seedling emergence and establishment in an old-field ecosystem. PLoS ONE 5(10): e13476. doi:10.1371/journal.pone.0013476
Engel, E.C., J.F. Weltzin, R.J. Norby, and A.T. Classen. 2009. Responses of an old-field plant community to interacting factors of elevated [CO2], warming, and soil moisture. Journal of Plant Ecology 2:1-11. DOI: 10.1093/jpe/rtn026
Resco de Dios, V., B.E. Ewers, W. Sun, T.E. Huxman, J.F. Weltzin and D.G. Williams. 2009. Drought-induced hydraulic limitations constrain leaf gas exchange recovery after precipitation pulses in the C3 woody legume, Prosopis velutina. New Phytologist 181: 672–682
Bridgham, S.D., J. Pastor, B. Dewey, J.F. Weltzin, and K. Updegraff. 2008. Rapid carbon response of peatlands to climate change. Ecology 89:3041-3048. DOI: 10.1890/08-0279.1
Cable, J.M., K. Ogle, D.G. Williams, J.F. Weltzin and T.E. Huxman. 2008. Soil texture drives responses of soil respiration to precipitation pulses in the Sonoran desert: implications for climate change. Ecosystems 11:961-979. DOI: 10.1007/s10021-008-9172-x
White, J. R., R. D. Shannon, S.D. Bridgham, J. F. Weltzin, and J. Pastor. 2008. Effects of soil warming and drying on methane cycling in a northern peatland mesocosm study. Journal of Geophysical Research 113: G00A06. DOI: 10.1029/2007JG000609
McPherson, G.R. and J.F. Weltzin. 2008. Implications of peak oil for industrialized societies. Bulletin of Science, Technology & Society 28:187-191. DOI: 10.1177/0270467608316098
Chen, J.Q., S.D. Bridgham, J. Pastor, A. Noormets, J. Keller, and J.F. Weltzin. 2008. Temperature responses to infrared-loading and water table manipulations in peatland mesocosms. Journal of Integrative Plant Biology 50:1484-1496. DOI: 10.1111/j.1744-7909.2008.00757.x
Resco de Dios, V., D.D. Ignace, W. Sun, T.E. Huxman, J.F. Weltzin and D.G. Williams. 2008. Chlorophyll fluorescence, predawn water potential and photosynthesis in precipitation pulse-driven ecosystems – implications for ecological studies. Functional Ecology 22:479-483. DOI: 10.1111/j.1365-2435.2008.01396.x
Dermody, O, J.F. Weltzin, E.C. Engel, P. Allen, and R.J. Norby. 2008. How do elevated [CO2], warming, and reduced precipitation interact to affect soil moisture and LAI in an old field ecosystem? Plant and Soil 295:217- 227. DOI: 10.1007/s11104-007-9443-x
Engel, E.C. and J.F. Weltzin. 2008. Can community composition be predicted from pairwise species interactions? Plant Ecology 195:77-85. DOI: 10.1007/s11258-007-9300-2
Wan, S., R.J. Norby, J. Ledford, and J.F. Weltzin. 2007. Responses of soil respiration to elevated CO2, air warming, and soil water availability in a model old-field grassland. Global Change Biology 13:2411–2424. DOI: 10.1111/j.1365-2486.2007.01433.x
Perkins, T.A., W.R. Holmes, and J.F. Weltzin. 2007. Multi-species interactions in competitive hierarchies: New methods and empirical test. Journal of Vegetation Science 18:685-692. Runner-up, 2007 Editors’ Award; J. Veg. Sci. (2008) 19:1-2. DOI: 10.3170/2008-8-18468
Sanders, N.J., J.F. Weltzin, G.M. Crutsinger, M.C. Fitzpatrick, M.A. Nuñez, C.M. Oswalt, and K.E. Lane. 2007. Insects mediate the effects of propagule supply and resource availability on a plant invasion. Ecology 88:2383-2391. DOI: 10.1890/06-1449.1
Fortner, A.M. and J.F. Weltzin. 2007. Competitive hierarchy for four common old-field plant species depends on resource identity and availability. Journal of the Torrey Botanical Society 134:166-176. DOI: 10.3159/1095-5674(2007)134[166:CHFFCO]2.0.CO;2
Ignace, D.D., T.E. Huxman, J.F. Weltzin and D.G. Williams. 2007. Leaf gas exchange and water status responses of a native and non-native grass to precipitation across contrasting soil surfaces in the Sonoran Desert. Oecologia. DOI: 10.1007/s00442-007-0670-x
Fitzpatrick, M.C., J.F. Weltzin, N.J. Sanders, and R.R. Dunn. 2007. The biogeography of prediction error: Why does the introduced range of the fire ant over predict its native range? Global Ecology and Biogeography 16:24-33. DOI: 10.1111/j.1466-822x.2006.00258.x
Belote, R.T. and J.F. Weltzin. 2006. Interactions between two co-dominant, invasive plants in the understory of a temperate deciduous forest. Biological Invasions 8:1629-1641. DOI: 10.1007/s10530-005-3932-8
Potts, D.L., T.E. Huxman, J.M. Cable, N.B. English, D.D. Ignace, J.A. Eilts, M.J. Mason, J.F. Weltzin and D.G. Williams. 2006. Antecedent moisture and seasonal precipitation influence response of canopy scale carbon and water exchange to rainfall pulses in semi arid grassland. New Phytologist. DOI: 10.1111/j.1469-8137.2006.01732.x
Weltzin, J.F., R. T. Belote, L.T. Williams, J.K. Keller, and E.C. Engel. 2006. Authorship in ecology: attribution, accountability, and responsibility. Frontiers in Ecology and the Environment 4:435-441. DOI: 10.1890/1540-9295(2006)4[435:AIEAAA]2.0.CO;2 [Reply to comments: Weltzin, J.F., R. T. Belote, L.T. Williams, J.K. Keller, and E.C. Engel. 2007. Ensuring that “authors” write - the authors reply. Frontiers in Ecology and the Environment 5:11].
Heisler, J.L. and J.F. Weltzin. 2006. Variability matters: towards a perspective on the influence of precipitation on terrestrial ecosystems. New Phytologist 172:189-192. DOI: 10.1111/j.1469-8137.2006.01876.x
Potts, D.L., T.E. Huxman, B.J. Enquist, J.F. Weltzin, and D.G. Williams. 2006. Resilience and resistance of ecosystem functional response to a precipitation pulse in a semi arid grassland. Journal of Ecology 94:23-30. DOI: 10.1111/j.1365 2745.2005.01060.x.
English, N.B., J.F. Weltzin, A. Fravolini, L.M. Thomas and D.G. Williams. 2005. The influence of soil texture and vegetation on soil moisture under rainout shelters in a semi-desert grassland. Journal of Arid Environments 63:324-343. DOI: 10.1016/j.jaridenv.2005.03.013
Yepez, E.A., T.E. Huxman, D.D. Ignace, N.B. English, J.F. Weltzin, A.E. Castellanos, and D.G. Williams. 2005. Dynamics of transpiration and evaporation following a moisture pulse in semiarid grassland: a chamber based isotope method for partitioning flux components. Agricultural and Forest Meteorology 132:359-376. DOI: 10.1016/j.agrformet.2005.09.006
Cole, P.G. and J.F. Weltzin. 2005. Light limitation creates patchy distribution of a non-native grass in eastern deciduous forests. Biological Invasions 7:477-488.
Weltzin1, J.F., J.K. Keller1, S.D. Bridgham, J. Pastor, P.B. Allen, and J. Chen. 2005. Litter as a control on fen plant community composition and production. Oikos 110:537-546. 1Authors contributed equally.
Fitzpatrick, M.C. and J.F. Weltzin. 2005. Ecological niche models and the geography of biological invasions: a review and a novel application. Pages 45-60 in Inderjit, editor. Ecological and Agricultural Aspects of Invasive Plants. Birkhauser Verlag/Switzerland.
Sanders, N.J., R.T. Belote and J.F. Weltzin. 2004. Multi trophic effects of elevated CO2 on understory plant and arthropod communities. Environmental Entomology 33:1609-1616.
Noormets, A., J. Chen, S.D. Bridgham, J. Pastor, J.F. Weltzin, B. Dewey, and J. LeMoine. 2004. The effects of infrared loading and water table on soil energy fluxes in northern peatlands. Ecosystems 7:573-582.
Chesson, P., R.L.E. Gebauer, S. Schwinning, N. Huntly, K. Wiegand, M.S.K. Ernest, A. Sher, A. Novoplansky, and J.F. Weltzin. 2004. Resource pulses, species interactions, and diversity maintenance in arid and semi arid environments. Oecologia 141:236-253.
Cole, P.G. and J.F. Weltzin. 2004. Environmental correlates of the distribution and abundance of Microstegium vimineum in East Tennessee, USA. Southeastern Naturalist 3:545-562.
Huxman1, T.E., M.D. Smith1, P.A. Fay, A.K. Knapp, M.R. Shaw, M.E. Loik, S.D. Smith, D.T. Tissue, J.C. Zak, J.F. Weltzin, W.T. Pockman, O.E. Sala, B. Haddad, J. Harte, G.W. Koch, S. Schwinning, E.E. Small, and D.G. Williams. 1Authors contributed equally. 2004. Convergence across biomes to a common rain-use efficiency. Nature 429:651-654.
Belote, R.T., J.F. Weltzin, and R.J. Norby. 2004. Response of an understory plant community to elevated [CO2] depends on differential responses of dominant invasive species and is mediated by soil water availability. New Phytologist 161:827-835.
Huxman, T.E., J.M. Cable, D. D. Ignace, J.A. Eilts, N.B. English, J.F. Weltzin, and D.G. Williams. 2004. Response of net ecosystem gas exchange to a simulated precipitation pulse in a semi-arid grassland: the role of native versus non-native grasses and soil texture. Oecologia 141:295 305.
English, N.B., D.G. Williams, and J.F. Weltzin. 2003. Soil temperature and moisture dynamics after experimental irrigation on two contrasting soils on the Santa Rita Experimental Range: implications for mesquite establishment. Pages 188-192 in McClaran, M.P., P.F. Ffolliott, and C.B. Edminster, tech coords. Santa Rita Experimental Range: 100 Years (1903 2003) of Accomplishments and Contributions. USDA Forest Service Proceedings RMRS-P-30.
Weltzin, J.F., M.E. Loik, S. Schwinning, D.G. Williams, P. Fay, B. Haddad, J. Harte, T.E. Huxman, A.K. Knapp, G. Lin, W.T. Pockman, M.R. Shaw, E. Small, M.D. Smith, S.D. Smith, D.T. Tissue, and J.C. Zak. 2003. Assessing the response of terrestrial ecosystems to potential changes in precipitation. BioScience 53:941-952.
Weltzin, J.F., N.Z. Muth, B. VonHolle, and P.G. Cole. 2003. Genetic diversity and invasibility: a test using a model system with a novel experimental design. Oikos 103:505-518.
Price, C.A. and J.F. Weltzin. 2003. Managing non-native plant populations through intensive plant community restoration in Cades Cove, Great Smoky Mountains National Park, USA. Restoration Ecology 11:351-358.
Drake, S.J., J.F. Weltzin, and P.D. Parr. 2003. Assessment of non-native invasive plants on the National Environmental Research Park at Oak Ridge National Laboratory. Castanea 68:15-30.
Weltzin, J.F. and P.B. Allen. 2003. Tree seedling recruitment in temperate deciduous forest: interactive effects of soil moisture, light, and slope position. Pages 217 - 226 in Hanson, P.J. and S.D. Wullschleger, eds. North American temperate deciduous forest responses to changing precipitation regimes. Ecological Studies, Volume 166. Springer Verlag, New York.
Weltzin, J.F., R.T. Belote, and N.J. Sanders. 2003. Biological invaders in a greenhouse world: will elevated CO2 fuel plant invasions? Frontiers in Ecology and the Environment 1:146-153.
Weltzin, J.F., S.D. Bridgham, J. Pastor, J. Chen, and C. Harth. 2003. Potential effects of warming and drying on peatland plant community composition. Global Change Biology 9:141-151.
Weltzin, J.F. and D.T. Tissue. 2003. Resource pulses in arid environments - patterns of rain, patterns of life. New Phytologist 157:171-173.
Weltzin, J.F. and G.R. McPherson. 2003. Assessing response of terrestrial populations, communities, and ecosystems to changes in precipitation regimes: progress to date and future directions. Pages 180-188 in Weltzin, J.F. and G.R. McPherson, eds. Changing Precipitation Regimes and Terrestrial Ecosystems: A North American Perspective. University of Arizona Press, Tucson.
Weltzin, J.F. and G.R. McPherson. 2003. Predicting the response of terrestrial ecosystems to potential changes in precipitation regimes. Pages 3-8 in Weltzin, J.F. and G.R. McPherson, eds. Changing Precipitation Regimes and Terrestrial Ecosystems: A North American Perspective. University of Arizona Press, Tucson
Weltzin, J.F. and G.R. McPherson. 2003. Response of southwestern oak savannas to potential future precipitation regimes. Pages 127-146 in Weltzin, J.F. and G.R. McPherson, eds. Changing Precipitation Regimes and Terrestrial Ecosystems: A North American Perspective. University of
Arizona Press, Tucson
Pastor, J., B. Peckman, S.D. Bridgham, J.F. Weltzin, and J. Chen. 2002. Plant community dynamics, nutrient cycling, and alternative stable equilibria in peatlands. American Naturalist 160:553-568.
R.J. Norby, P.J. Hanson, E.G. O'Neill, T.J. Tschaplinski, J.F. Weltzin, R.T. Hansen, W. Cheng, S.D. Wullschleger, C.A. Gunderson, N.T. Edwards, and D.W. Johnson. 2002. Net primary productivity of a CO2-enriched deciduous forest and the implications for carbon storage. Ecological Applications 12:1261-1266.
Weltzin, J.F., K.A. Snyder, and D.G. Williams. 2001. Experimental manipulations of precipitation seasonality: effects on oak (Quercus) seedling demography and physiology. Western North American Naturalist 61:463-472.
Weltzin, J.F., C. Harth, S.D. Bridgham, J. Pastor, and M. Vonderharr. 2001. Production and microtopography of bog bryophytes: response to warming and water-table manipulations. Oecologia 128:557-565.
McPherson, G.R. and J.F. Weltzin. 2000. Disturbance and climate change in United States/Mexico borderland plant communities: A state-of-the-knowledge review. USDA Forest Service Rocky Mountain Research Station General Technical Report RMRS-GTR-50. 20 pp
Hanson, P.J. and J.F. Weltzin. 2000. Drought and climate change as vectors of disturbance in temperate forest communities. Science of the Total Environment 262:205-220
Weltzin, J.F. and G.R. McPherson. 1999. Facilitation of conspecific seedling recruitment and shifts in temperate savanna ecotones. Ecological Monographs 69:513-534
Weltzin, J.F., J. Pastor, C. Harth, S.D. Bridgham, K. Updegraff, and C.T. Chapin. 2000. Response of bog and fen plant communities to warming and water-table manipulations. Ecology 81:3464-3478.
Weltzin, J.F. and G.R. McPherson. 2000. Implications of precipitation redistribution for shifts in temperate savanna ecotones. Ecology 81:1902-1913
Williams, D.G., G.R. McPherson, and J.F. Weltzin. 1999. Stress in wildland plants: implications for ecosystem structure and function. Pages 907 929 in M. Pessarakli, ed. Handbook of plant and crop stress, second edition. Marcel Dekker, New York, NY.
Weltzin, J.F., S.R. Archer, and R.K. Heitschmidt. 1998. Defoliation and woody plant (Prosopis glandulosa) seedling establishment: potential vs. realized herbivory tolerance. Plant Ecology 138:127-135
McPherson, G.R. and J.F. Weltzin. 1998. Herbaceous response to canopy removal in southwestern oak woodlands. Journal of Range Management 51:674-678
Weltzin, J.F., S.R. Archer, and R.K. Heitschmidt. 1997. Small mammal regulation of vegetation structure in a temperate savanna. Ecology 78:751-763
Weltzin, J.F., S.L. Dowhower, and R.K. Heitschmidt. 1997. Prairie dog effects on plant community structure in southern mixed-grass prairie. Southwestern Naturalist 42:251-258.
Weltzin, J.F. and G.R. McPherson. 1997. Spatial and temporal soil moisture resource partitioning by trees and savannas in a temperate savanna, Arizona, USA. Oecologia 112:156-164.
Germaine, H.L., G.R. McPherson, K. Rojahn, A. Nicholas, and J.F. Weltzin. 1997. Constraints on germination and emergence of Emory oak. Pages 225-230 in R.B. Standiford, technical coordinator. Proceedings of a Symposium on Oak Woodlands: Ecology, Management, and Urban Interface Issues. USDA Forest Service Pacific Southwest Experiment Station General Technical Report PSW-160, Berkeley, California
Weltzin, J.F. and G.R. McPherson. 1995. Potential effects of climate change on lower treelines in the southwestern United States. Pages 180-193 in DeBano, L.F., G.J. Gottfried, R.H. Hamre, C.B. Edminster, P.F. Ffolliott, and A. Ortega-Rubio, technical coordinators. Biodiversity and Management of the Madrean Archipelago: The Sky Islands of Southwestern United States and Northwestern Mexico. USDA Forest Service Rocky Mountain Experiment Station General Technical Report RM-264, Fort Collins, Colorado
Weltzin, J. F. and M.B. Coughenour. 1990. Savanna tree influence on understory vegetation and soil nutrients in northwestern Kenya. Journal of Vegetation Science 1:325-334.
Date published: August 13, 2018
Will the early bird still get the worm?
For migrating birds, timing is everything. Showing up at breeding grounds at the right time can ensure a great nesting spot with plenty of food. But recent changes in the conditions and foods that birds depend on makes this timing harder to get right.
Date published: February 23, 2017
Just HOW EARLY is spring arriving in your neighborhood? Find out . . .
Get your flip-flops and shorts out because spring is arriving very early this year . . . at least 2-3 weeks early across almost the entire Southeast, from San Antonio to Atlanta to Washington, D.C. This unusually early spring is likely to keep rolling north, already bringing surprising signs of spring to portions of the central Midwest and northeastern states.