* indicates post-doctoral, graduate, undergraduate advisee, or lab member

In Review

Chamberlain SD*, Ingraffea AR, and Sparks JP. Sourcing methane and carbon dioxide emissions from a small city: influence of natural gas leakage and combustion. Environmental Science and Technology.

In Press

Craig, E.*, T. King, J.P. Sparks, and P. Curtis. Seasonal interactions play a limited role in Double-crested Cormorant life history. Journal of Avian Biology.


Chamberlain S.D.*, Groffman P.M., Boughton E.H., Gomez-Casanovas N., DeLucia E.H., Bernacchi C.J., and J.P. Sparks. The impact of water management practices on subtropical pasture methane emissions and ecosystem service payments. Ecological Applications. 27(4):1199-1209.

Pierre, S., Hewson, I., Sparks, J.P., Litton, C.M., Giardina, C., Groffman, P.M., and T.J. Fahey. Ammonia oxidizer populations vary with nitrogen cycling across a tropical montane mean annual temperature gradient. Ecology. 98(7):1896-1907.

Ramirez-Valiente, J.A., Center, A., Sparks, J.P., Sparks, K.L., Etterson, J.R., Longwell, T., Pilz, G., and J. Cavender-Bares. Population-Level Differentiation in Growth Rates and Leaf Traits in Seedlings of the Neotropical Live Oak Quercus oleoides Grown under Natural and Manipulated Precipitation Regimes. Frontiers in Plant Science. 8: Article 585.

Long, M.S., Litton, C.M., Giardina, C.P., Deenik, J., Cole, R.J. and J.P. Sparks. Impact of nonnative feral pig removal on soil structure and nutrient availability in Hawaiian tropical montane wet forests. Biological Invasions. 19(3):749-763.

Soper F.M.*, McCalley C.K.*, Sparks K.L.* and J.P. Sparks. Soil carbon dioxide emissions from the Mojave desert: isotopic evidence for a carbonate source. GRL. 44(1):245-251.

Hasselquist, E.M.*, Hasselquist N.J., Sparks J.P. and C. Nilsson. Recovery of nitrogen cycling in riparian zones after stream restoration using delta N-15 along a 25-year chronosequence in northern Sweden. Plant and Soil. 410(1-2): 423-436.

Low C. and J.P. Sparks. Insect herbivory is associated with microsite quality. Journal of the Torrey Botanical Society. 144(1):26-34.


Soper F.M.* and J.P. Sparks. Estimating ecosystem nitrogen addition by a leguminous tree: A mass balance approach using a woody encroachment chronosequence. Ecosystems. DOI.

Leigh K.L.*, Sparks J.P., and W.E. Bemis. Food preferences of Atlantic hagfish, Myxine glutinosa, assessed by experimental baiting of traps. Copeia. 104(3):623-627.

Linderholm A., D. Spencer, V. Battista, L. Frantza, R. Barnetta, R. Fleischer, H.F. James, D. Duffy, J.P. Sparks, D.R. Clements, L. Andersson, K. Dobney, J. Leonard, G. Larson. A Novel MC1R allele for black coat colour reveals the Polynesian ancestry and hybridisation patterns of Hawaiian feral pigs. Royal Society Open Science. 3(9):Article number 160304.

FM Soper*, TW Boutton, PM Groffman, JP Sparks. Nitrogen trace gas fluxes from a subtropical, semi-arid savanna under woody legume encroachment. Global Biogeochemical Cycles

FM Soper*, PM Groffman, JP Sparks. Denitrification in a subtropical, semi-arid North American savanna: field measurements and intact soil core incubations. Biogeochemistry, 128:257-266

Chamberlain S.D.*, Walter M.T., Gomez-Casanovas N., Boughton E.H., Bernacchi C.J., DeLucia E.H., Groffman P.M., Keel E.W., and Sparks J.P. Influence of transient flooding on methane fluxes from subtropical pastures. JGR Biogeosciences. 121(3):965-977

Collins, S.M.*, J.P. Sparks, S.A. Thomas, S.A. Wheatley, and A.S. Flecker. Increased Light Availability Reduces the Importance of Bacterial Carbon in Headwater Stream Food Webs Ecosystems. 19(3):396-410

Coe, K.K.* and J.P. Sparks. Cyanobacteria associations in temperate forest bryophytes revealed by δ15N analysis. Journal of the Torrey Botanical Society. 143(1):50-57

Craig, E.*, T. King, J.P. Sparks, and P. Curtis. Aquaculture depredation by Double-crested Cormorants breeding in Eastern North America. Journal of Wildlife Management 80:57-62.


Craig, E.*, S. Elbin, J.P. Sparks, and P. Curtis. Identifying important foraging habitats for colonial waterbirds in an urban estuary: A stable isotope approach. Waterbirds 38:330-338.

Craig, E.*, B. Dorr, K. Hanson-Dorr, J.P. Sparks, and P. Curtis. Isotopic discrimination in the Double-crested Cormorant. PLOS ONE 10:e0140946.

Goodale, C.L.,  G. Fredriksen, M. S. Weiss, C. K. McCalley*, J. P. Sparks, and S. A. Thomas. Soil processes drive seasonal variation of 15N retention in a deciduous forested catchment. Ecology. 96(10):2653-2668.

Chamberlain, S.D.* and J.P. Sparks. Underlying ecosystem emissions exceed cattle-emitted methane from subtropical lowland pastures. Ecosystems. 18(6):933-945.

Butler, R. Marino, D. Schwede, R. W. Howarth, J. P. Sparks and K. L. Sparks*. Atmospheric ammonia measurements at low concentration sites in the northeastern USA: implications for total nitrogen deposition and comparison with CMAQ model estimates. Biogeochemistry. 122(2):191-210.

Soper F.M.*, T.W. Boutton, and J. P. Sparks. Investigating patterns of symbiotic nitrogen fixation during vegetation change from grassland to woodland using fine scale δ15N measurements. Plant, Cell and Environment. 38(1):89-100.

Lombardozzi, D.L.*, S. Levis, G. Bonan, P.G. Hess and J.P. Sparks. The influence of chronic ozone exposure on global carbon and water cycles. Journal of Climate. 28(1):292-305


K.K. Coe* and J.P. Sparks. Physiology-based prognostic modeling of the influence of changes in precipitation on a keystone dryland plant species. Oecologia 176:933-942.

L.C. Mejiaa, E.A. Herre, J.P. Sparks, K. Winter, M.N. Garcia, S.A. Van Bael, J. Stitt, Z. Shi, Y. Zhang, M.J. Guiltinan, and S.N. Maximova. Pervasive effects of a dominant foliar endophytic fungus on host genetic and phenotypic expression in a tropical tree. Frontiers in Microbiology 5:

D.R. Caulton, P.B. Shepson, R.L. Santoro, J.P. Sparks, R.W. Howarth, A. Ingraffea, M.O. Cambaliza, C. Sweeney, A. Karion, K.J. Davis, B. Stirm, S. Montzka, and B. Miller. Toward a better understanding and quantification of methane emissions from shale gas development. PNAS. 111(17): 6237-6242.


D. Lombardozzi*, J.P. Sparks, and G. Bonan. Integrating O3 influences on terrestrial processes: Photosynthetic and stomatal response data available for regional and global modeling. Biogeosciences. 10(11):6815-6831.

D.M. Vallano* and J.P. Sparks. Foliar delta 15N patterns influenced by foliar nitrogen uptake, soil delta 15N, and mycorrhizae along a regional nitrogen deposition gradient. Oecologia. 172(1): 47-58.

I. Smajlović, K. L. Sparks*J. P. Sparks, I. L. Čukalović, and S. Jović. Ethanol Isotope Method (EIM) for uncovering illegal wine. Natural Product Research.

R.C. Bell, A. Belmaker, C.S. Couch, K.M. Marchetto, J.L. Simonis, R.Q. Thomas, J.P. Sparks, J.M. Brown, K.S. Francisco and M.E. Manuel. Effectiveness of Erythrina gall wasp biocontrol and implications for the recovery of threatened Wiliwili trees (Fabaceae: Erythrina sandwicensis). The Journal of the Torrey Botanical Society. 140(2): 215-224.


D.L. Lombardozzi*, S. Levis, G. Bonan, and J.P. Sparks. Predicting photosynthesis and transpiration responses to ozone: decoupling modeled photosynthesis and stomatal conductance. Biogeosciences. 9(8): 3113-3130.

J. Hamilton, A.R. Zangerl, M.R. Berenbaum, J.P. Sparks, L. Elich, A. Eisenstein and E.H. DeLucia. Elevated atmospheric CO2 alters the arthropod community in a forest understory. Acta Oecologia. 43: 80-85.

K.K. Coe*, J. Belnap and J.P. Sparks. Precipitation-driven carbon balance controls survivorship of desert biocrust mosses. Ecology. 93(7): 1626-1636.

K.K. Coe*J.P. Sparks and J. Belnap.  Ecophysiology of soil crust mosses in dryland systems. In Advances in Photosynthesis and Respiration: Photosynthesis of Bryophytes and Early Land Plants. David Hanson & Steve Rice, Eds. Govindjee & Sharkey, Series Eds. Springer, Dordrecht.

S.C. Reed, K.K. Coe*, J.P. Sparks, D.C. Housman, T.J. Zelikova and J. Belnap. Changes to dryland rainfall result in rapid moss mortality and altered soil fertility. Nature Climate Change. 2:752-755.

D. L. Lombardozzi*, J. P. Sparks, G. Bonan and S. Levis. Ozone exposure causes a decoupling of conductance and photosynthesis: implications for the Ball-Berry stomatal conductance model. Oecologia. 169(3): 651-659.

K. K. Coe*, J. Belnap, E. E. Grote, and J. P. Sparks.  Physiological ecology of the desert biocrust moss Syntrichia caninervis following ten years exposure to elevated CO2: evidence for enhanced photosynthetic thermotolerance.  Physiologia Plantarum. 144(4): 346-356.


L.E. Nave, C.M. Gough, K. Maurer, G. Bohrer, B.S. Hardiman, J. Le Moine, A.B. Munoz, K.J. Nadelhoffer, J. P. Sparks, B.D.Strahm*, C.S. Vogel, and P.S. Curtis. Disturbance, decoupling and resilience of carbon and nitrogen cycles in a northern temperate forest: initial results from the Forest Accelerated Succession ExperimenT (FASET). JGR-Biogeosciences. 116: G04016, doi:10.1029/2011JG001758.

Baker D.M.*, K. Kim, J. Andras, J. P. Sparks. Light-mediated 15N fractionation in Caribbean gorgonian octocorals.  Coral Reefs. 30: 709-717.

McCalley C.K.*, B. D. Strahm*, K. L. Sparks*, A. S.D. Eller*, and J. P. Sparks.  The effect of long-term exposure to elevated CO2 on nitrogen gas emissions from Mojave Desert soils. JGR-Biogeosciences. 116: G03022, doi:10.1029/2011JG001667.

Sparks, J. P., S. Chandra, L. A. Derry, M. V. Parthasarathy, C. S. Daugherty, and R. Griffin*.  The distribution of silicon and germanium in tissues of annual blue grass (Poa annua L.):  Evidence for differential and active transport from SIMS ion microscopy.  Biogeochemistry. 104: 237-249.a>

Eller, A. S. D.*, K. L. McGuire and J. P. Sparks. Responses of sugar maple and hemlock seedlings to elevated carbon dioxide under altered above- and belowground nitrogen sources.  Tree Physiology. 31: 391-401.


J. T. Anderson*, J. P. Sparks and M. A. Geber. Phenotypic plasticity despite source–sink population dynamics in a long-lived perennial plant. New Phytologist. 188: 856–867.

E. E. Grote, J. Belnap, D. Hausman, and J. P. Sparks. Carbon exchange in biological soil crust communities under differential temperatures and soil water contents: implications for global change.  Global Climate Change. 16: 2763–2774.

Monson R. K., M. R. Prater, J. Hu, S. P. Burns, J. P. Sparks, K. L. Sparks*, L. E. Scott-Denton. Tree species effects on ecosystem water-use efficiency in a high-elevation, subalpine forest. Oecologia. 162(2):491-504.


McCalley, C. K.* and J. P. Sparks. Abiotic gas formation drives nitrogen loss from a desert ecosystem. Science. 326(5954):837-840.

Sparks, J.P.  Foliar incorporation of reactive nitrogen: an important ecological process?  Oecologia. 159(1):1-13.

Agrawal A. A., M. Fishbein, R. Jetter, J. Salminen, J. B. Goldstein, A. E. Freitag* and J. P. Sparks. Phylogenetic ecology of leaf surface traits in the milkweeds (Asclepias spp.): chemistry, ecophysiology, and insect behavior. New Phytologist. 183:848-867.

Barney J.N.*J. P. Sparks, J. Greenberg, T. H. Whitlow, and A. Guenther. Biogenic volatile organic compound from an invasive species: impacts on plant-plant interactions.  Plant Ecology. 203:195-205.


Miller, C. T.*, W. B. Miller, and J.P. Sparks. Comparison of total chlorophyll content with chlorophyll meter readings in Oxalis regenellii. HortScience. 43:1097.

Yi, C., D. E. Anderson, A. A. Turnipseed, S. P. Burns, J. P. Sparks, D. I. Stannard, and R. K. Monson.  The contribution of advective fluxes to net ecosystem CO2 exchange in a high-elevation, subalpine forest.  Ecological Applications.  18(6):1379-1390.

McCalley, C. K.* and J. P. Sparks. Controls over NO and NH3 emissions from Mojave Desert soils. Oecologia. 156:871-881.

Johnson E. G., J.P. Sparks, B. Dzikovski, B.R. Crane, D.M. Gibson, and R. Loria. Plant-pathogenic Streptomyces species produce nitric oxide synthase derived nitric oxide in response to host signals.  Chemistry & Biology 15(1):43-50.

Vallano, D.M.* and J.P. Sparks. Quantifying foliar uptake of gaseous nitrogen dioxide using enriched foliar d15N values. New Phytologist 177:946-955.

Sparks, J. P., A. J. Walker, A. A. Turnipseed, and A. Guenther.  Dry nitrogen deposition estimates over a forest experiencing free air CO2 enrichment.  Global Change Biology. 14(4):768-781.


Joshi, M.V., D.R.D Bignell, E.G. Johnson, J. P. Sparks, D.M. Gibson, R. Loria.  The AraC/XylS regulator TxtR modulates thaxtomin biosynthesis and virulence in Streptomyces scabies. Molecular Microbiology 66(3):633-642.

Derry, L. A., J. P. Sparks and S. Chandra. Ge/Si fractionation by higher plants: mechanisms and applications to biogeochemical cycles.  Geochemica et Cosmochimica Acta 71(15):A219-A219 Suppl. S.

Canny, M. J., J. P. Sparks, C. X. Huang, and M. L. Roderick.  Air embolisms exsolving in the transpiration water – the effect of constrictions in the xylem pipes.  Functional Plant Biology 34(2):95-111.

Sparks, J. P.  Enhancing the efficiency of nitrogen utilization in plants.  The Quarterly Review of Biology. 82(4): Page 422–422.

Vallano, D. M.* and J. P. Sparks.  Foliar 15N signatures as indicators of foliar uptake of atmospheric nitrogen pollution.  In:  Stable Isotopes as Indicators of Environmental Changes, T. E. Dawson (ed.).  pp. 93-109. Academic Press.


Eller, A. S. D.* and J. P. Sparks.  Predicting leaf-level fluxes of ozone and nitrogen dioxide:  The relative roles of diffusion and biochemical processes.  Plant, Cell, and Environment 29(9):1742 1750.

Teklemariam, T. A.* and J. P. Sparks.  Leaf fluxes of NO and NO2 in four herbaceous plant species:  The role of ascorbic acid.  Atmospheric Environment 40(12):2235 2244.

Turnipseed, A. A., L. G. Huey, E. Nemitz, R. Stickel, J. Higgs, D. J. Tanner, D. L. Slusher, J. P. Sparks, F. Flocke, and A. Guenther.  Eddy covariance fluxes of Peroxyacetyl nitrates (PANs) and NOy to a coniferous forest.  Journal of Geophysical Research-Atmospheres 111:D09304, doi:10.1029/2005JD006631.


Holland, E. A., S. B. Bertman, M. A. Carroll, A. B. Guenther, P. B. Shepson, J. P. Sparks, and J. Lee-Taylor.  U.S. nitrogen science plan focuses collaborative efforts.  EOS 86(27):253-260.

Monson, R. K., J. P. Sparks, T. N. Rosenstiel, L. E. Scott-Denton, T. E. Huxman, P. C. Harley, A. A. Turnipseed, S. P. Burns, B. Backlund, and J. Hu.  Climatic influences on net ecosystem CO2 exchange during the transition from wintertime carbon source to springtime carbon sink in a high-elevation, subalpine forest.  Oecologia 146(1):130-147.


Althoff, D. M., K. A. Segraves, and J. P. Sparks.  Characterizing the interaction between the bogus yucca moth and yuccas:  Do bogus yucca moths impact yucca reproductive success?  Oecologia 140(2):321 327.

Angeles, G., B. Bond, J. S. Boyer, T. Brodribb, J. R. Brooks, M. J. Burns, J. Cavender Bares, M. Clearwater, H. Cochard, J. Comstock, S. D. Davis, J. C. Domec, L. Donovan, F. Ewers, B. Gartner, U. Hacke, T. Hinckley, N. M. Holbrook, H. G. Jones, K. Kavanagh, B. Law, J. Lopez-Portillo, C. Lovisolo, T. Martin, J. Martinez-Vilalta, S. Mayr, F. C. Meinzer, P. Melcher, M. Mencuccini, S. Mulkey, A. Nardini, H. S. Neufeld, J. Passioura, W. T. Pockman, R. B. Pratt, S. Rambal, H. Richter, L. Sack, S. Salleo, A. Schubert, P. Schulte, J. P. Sparks, J. Sperry, R. Teskey, and M. Tyree.  The cohesion-tension theory.  New Phytologist 163(3):451 452.

Sparks, J. P.  Plant uptake of reactive nitrogen.  In:  Studying Forest Canopies from Above:  The International Canopy Crane Network, Y. Basset, V. Horlyck, and J. Wright (eds.).  UNEP & Smithsonian Institution.  ISBN 9962-614-05-8.

Sparks, J. P.  Photosynthesis and autotrophic energy flows.  In:  Encyclopedia of Energy, C. S. Cleveland (ed.).  Elsevier, Inc., New York, volume 5, pp. 9-16.

Sparks, J. P.  The herbaceous layer in forests of Eastern North America.  The Quarterly Review of Biology 79(3):324.

Teklemariam, T. A.* and J. P. Sparks.  Gaseous fluxes of peroxyacetyl nitrate (PAN) into plant leaves.  Plant, Cell, and Environment 27(9):1149-1158.


Huxman, T. E., A. A. Turnipseed, J. P. Sparks, P. C. Harley, and R. K. Monson.  Temperature as a control over ecosystem CO2 fluxes in a high-elevation, subalpine forest.  Oecologia 134(4):537-546.

Sparks, J. P., J. M. Roberts, and R. K. Monson.  The uptake of gaseous organic nitrogen by leaves:  A significant global nitrogen transfer process.  Geophysical Research Letters 30(23):2189.


Brooks, J. R., N. Buchmann, S. Phillips, B. Ehleringer, R. D. Evans, M. Lott, L. A. Martinelli, W. T. Pockman, D. R. Sandquist, J. P. Sparks, L. Sperry, D. G. Williams, and J. R. Ehleringer.  Heavy and light beer:  A carbon isotope approach to detect C4 carbon in beers of different origins, styles and prices.  Journal of Agricultural and Food Chemistry 50(22):6413-6418.

Monson, R. K., A. A. Turnipseed, J. P. Sparks, P. C. Harley, L. E. Scott-Denton, K. L. Sparks*, and T. E. Huxman.  Carbon sequestration in a high elevation, subalpine forest.  Global Change Biology 8(5):459-478.

Thornton, P. E., B. E. Law, H. L. Gholz, K. L. Clark, E. Falge, D. S. Ellsworth, A. H. Goldstein, R. K. Monson, D. Hollinger, M. Falk, J. Chen, and J. P. Sparks.  Modeling and measuring the effects of disturbance history and climate on carbon and water budgets in evergreen needleleaf forests.  Agricultural and Forest Meteorology 113(1-4):185-222.


Sparks, J. P., G. S. Campbell, and R. A. Black.  Water content, hydraulic conductivity, and ice formation in winter stems in Pinus contorta:  A TDR case study.  Oecologia 127(4):468 475.

Sparks, J. P., R. K. Monson, K. L. Sparks*, and M. Lerdau.  Leaf uptake of nitrogen dioxide (NO2) in a tropical wet forest:  Implications for tropospheric chemistry.  Oecologia 127(2):214-221.


Sparks, J. P. and R. A. Black.  Annual patterns of xylem embolism and resistance to tension-induced xylem cavitation in coniferous trees from upper and lower treeline.  Journal of Arctic, Antarctic and Alpine Research 32:101-106.

Sparks, J. P., G. S. Campbell, and R. A. Black.  Liquid water content of wood tissue at temperatures below 0 ˚C.  Canadian Journal of Forest Research 30:624-630.


Sparks, J. P. and R. A. Black.  Regulation of water loss in populations of Populus trichocarpa:  The role of stomatal control in preventing xylem cavitation.  Tree Physiology 19:453-459.


Sparks, J. P.  The consequences of xylem cavitation in several North American tree species.  Ph.D. Dissertation, Washington State University.


Sparks, J. P. and J. R. Ehleringer.  Leaf carbon isotope discrimination and nitrogen content for riparian trees along elevational transects.  Oecologia 109:362-367.