Global Change

Research Group

Steven J. Hastings

Experience

Publications

Abstracts of Meetings

Consulting Experience

E-Mail to: shasting@sunstroke.sdsu.edu

Education:

B.S., Zoology, University of Nebraska, Lincoln, Nebraska, 1974.
M.S., Marine Science (Biology) College of William and Mary, Williamsburg, Virginia, 1980,

Experience:

1985-Present

Adjunct Faculty/Research Associate, San Diego State University, College of Sciences, San Diego, California. Write proposals, scientific papers and Environmental Impact Statements. Field and laboratory research in the chaparral and arctic, productivity, nutrient and ecosystem carbon balance studies.

1992, Inter., 1990-Spring, Fall, 1989-Fall

Adjunct Faculty, University of San Diego, San Diego, California. Survey of Biology, Lecture and Lab.

1991-Spring, 1990-Spring, Fall, 1989-Spring Summer, 1989-Fall

Adjunct Faculty, San Diego City College, San Diego, California. Oceanography (Bio. 110) with emphasis in physical, geological, biological and chemical oceanography, and General Biology, Lecture and Lab.

1989-Spring

Adjunct Faculty, Grossmont Community College, San Diego, California. Oecenography 112, emphasis in physical, geological and chemical oceanography.

1985-1987

Logistics Coordinator, Systems Ecology Research Group. Facilitate multi-institutional research activities at arctic field stations. Responsibilities included personnel, laboratory and data management, experimental design, mapping, site protection, logistics and technical services.

1984-1985

Manager, Systems Ecology Resear Group. Coordinate and monitor research facilities and equipment amongst principal investigtors and technicians, forecast and monitor research budgets and equipment inventories, prepare annual technical reports.

1980-1983

Research Technician, in physiological plant ecology in California Chaparral, Systems Ecology Group, San Diego State University. Duties included field determination of plant water relations, water potentials, leaf conductances, photosynthetic rates, root biomass, laboratory determination of RUBP carboxylase/oxygenase activity and leaf carbohydrate levels in resprouts following fire.

Fall-1979

Biological Aid (Fisheries), Northeast Fisheries Center, National Marine Fisheries Service, Sandy Hook Laboratory. Duties included determination of seabed oxygen consumption using a Pamatmat multiple corer, maintenance and calibration of equipment.

1976-1979

Graduate Research Assistant, Ecology Pollution, Virginia Institute of Marine Science, Gloucester Point, Virginia. Duties included cruise preparation, lab maintenance, determination of primary productivity, heterotrophy, concentration of nutrients, chlorophyll a, oxygen and physical measurements of the water columns within the Chesapeake Bay, marshes, and seagrass beds.

Summer,1975

Laboratory Technician, University of Nebraska Soil Testing Laboratory, Lincoln, Nebraska. Duties included extraction and measurement of metals in soil and water samples using an Atomic Absorption Spectrophotometer.

Spring,1975

Laboratory Instructor, General Physiology, University of Nebraska, Lincoln, Nebraska.

1974-1975

Student Research Assistant, University of Nebraska, Lincoln, Nebraska. Duties included the extraction and purification of fatty acid synthetase from chicken livers, and livers from cold and warm acclimated trout utilizing column chromatography. Enyzyme assays included determination of pH optima, Ea, and kinetic constants.

Summer,1974

Team member on Student Originated Studies Program (National Science Foundation): A Limnology Study of Perry Reservoir With Emphasis on Primary Productivity. Benedictine College, Atchison, Kansas. Duties included biweekly field sampling, followed by the identification and enumeration of phytoplankton samples and physical measurements of the water column

• Oechel, W.C., G.L. Vourlitis, S.J. Hastings. Correlation in the spatial trends of respiration, productivity, and microclimate across an arctic tundra landscape. Soil Scoiety Science of America. (accepted).

• Harazono, Y, Roberts S.W., Vourlitis G.L., Hastings S.J., and Oechel W.C. Eddy covariance measurements of net CO₂ flux and energy balance of chaparral ecosystems along a fire-induced age gradient. (accepted by Ecology).

• Roberts, S.W., W.C. Oechel, P.J. Bryant, S. J. Hastings, J. Major and V. Nosov. A field fumigation system for elevated carbon dioxide exposure in chaparral vegetation. (accepted by Functional Ecology).

• Oechel, Walter C., George L. Vourlitis, Stevem J. Hastings Richard P. Ault, Jr., and Pablo Bryant. 1998 The effects of water and elevated temperature on the net CO₂ flux of wet sedge tundra ecosystems. Global Change Biology. 4: 77-90.

• Oechel WC, Cook AC, Hastings SJ and Vourlitis GL. 1997. 12. Effects of CO₂ and climate change on arctic ecosystems. In: Woodin, S.J. and Marquiss, M (eds.). Special Publication Number 13 of the British Ecological. Blackwell, Edinburhgh, England. pp. 286.

• Oechel, W.C., G. Vourlitis, and S.J. Hastings. 1997. Cold-season CO₂ emission from arctic soils. Global Biogeochemical Cycles. 11: 163-172.

• Waelbroeck, C., P. Monfray, W.C. Oechel, S. Hastings and G. Vourlitis. The impact of permafrost thawing on the carbon dynamics of tundra. Geophysical Research Letters, Vol. 24, No. 3, Pages 229-232, AGU, 1997.

• Oechel, W.C., S.J. Hastings, G.L. Vourlitis, M.A. Jenkins, C.L. Hinkson. 1995 Direct Effects of CO₂ in Chaparral and Mediterranean-Type Ecosystems. In: J.M. Moreno and W.C. Oechel. (eds.). Global Change and Mediterranean-Type Ecosystems. Ecological Studies 117. Springer, New York, NY, pp. 58-75.

• Reece, D.F., S.V. Krupa, H.J. Jager, S.W. Roberts, S.J. Hastings, and W.C. Oechel. 1995. Evaluating the effects of elevated levels of atmospheric trace gases on herbs and shrubs: A prototype dual array field exposure system. Environmental Pollution. 90: 25-31.

• Oechel, W.C., G.L. Vourlitis, S.J. Hastings, and S.A. Bochkarev. 1995. Change in Arctic CO₂ flux-over two decades: Effects of climate change at Barrow, Alaska. Ecol. Appl. 5: 846-855.

• Oechel, W.C., S.J. Hastings, G.L. Vourlitis, M.A. Jenkins, C.L. Hinkson. 1995 Direct Effects of CO₂ in Chaparral and Mediterranean-Type Ecosystems. In: J. Moreno and W. Oechel. (eds.). Global Change and Mediterranean-Type Ecosystems. Ecological Studies, 117: 58-75.

• Oechel, W.C., S. Cowles, N. Grulke, S.J. Hastings, B. Lawrence, T. Prudhomme, G. Riechers, B. Strain, D. Tissue, and G. Vourlitis. 1994. Transient nature of CO₂ fertilization in Arctic tundra. Nature. 371: 500-503.

• Vourlitis, G.C., Oechel, W.C., Hastings, S.J., and M.A. Jenkins. 1993. A system for measuring in situ CO₂ and CH₄ flux in unmanaged ecosystems: An arctic example. Functional Ecology 7: 369-379.

• Vourlitis, G.C., Oechel, W.C., Hastings, S.J., and M.A. Jenkins. 1993. The Effect of Soil Moisture and Thaw Depth on Methane Flux from Alaskan Wet Coastal Tundra Ecosystems. Chemosphere 26(1-4):329-338.

• Oechel, W.C., Hastings, S.J., Jenkins, M., Riechers, G., Grulke, N., and G. Vourlitis. 1993. Recent change of Arctic tundra ecosystems from a net carbon dioxide sink to a source. Nature 361:520-523.

• Oechel, W.C., Riechers, G., Lawrence, W.T., Prudhomme, T.I. Grulke, N., and Hastings, S.J. 1991. "CO2LT", A Closed, Null-balance System for Long-term in situ Ecosystem Manipulation and Measurement of CO₂ Level, CO₂ Flux, and Temerpature. Functional Ecology 6: 86-100.

• Hastings, S.J., Luchessa, S.A., Oechel, W.C. and Tenhunen, J.D. 1989. Standing biomass and production in water drainages of the foothills of the Philip Smith Mountains, Alaska. Holarctic Ecology 12: 304-311.

• Marion, G.M., S.J. Hastings, S.F. Oberbauer, and W.C. Oechel. 1989. Soil-plant nutrient relationships in a tundra ecosystem. Holarctic Ecology 12: 296-303.

• Oberbauer, S.F., S.J. Hastings, J.L. Beyers, W.C. Oechel. 1989. Impacts of variation in water and nutrient supply on nutrition, photosynthesis, and growth in Alskan tundra. Holarctic Ecology 12: 312-316.

• Hastings, S.J., W.C. Oechel and N. Sionit. 1989. Water Relations and Photosynthesis of Chaparral Resprouts and Seedlings Following Fire and Hand Clearing. In: S. Keeley (ed.) Proc. of the Symp., The California chaparral Paradigms reexamined (7-8 Nov. 1986, Los Angeles Natural History Museum, L.A.).

• Matthes-Sears, U., W.C. Matthes-Sears, S.J. Hastings and W.C. Oechel. 1988. Variation in nutrient status, biomass, vegetative characteristics, and gas exchange of two deciduous shrubs on an arctic tundra slope. Arctic and Alpine Research 20: 342-351.

• Kummerow, J., J.N. Mills, B.A. Ellis, S.J. Hastings and A. Kummerow. 1987. Downslope Fertilizer Movement In Arctic Tussock Tundra. Holarctic Ecology 10: 312-319.

• Oberbauer, S.F., N. Sionit, S.J. Hastings and W.C. Oechel. 1986 Effects of CO₂ enrichment and nutrition on growth, photosynthesis and nutrient concentration of Alaskan tundra species. Can. J. Bot. 64:2993-2998.

• Prudhomme, T.I., W.C. Oechel, S.J. Hastings, and W.T. Lawrence. 1984. Net ecosystem gas exchange at ambient and elevated carbon dioxide concentrations in tussock tundra at Toolik Lake, Alaska: An evaluation of methods and initial results, pp. 155-161. In: J.H. McBeath (ed.), The potential effects of carbon dioxide-induced climatic changes in Alaska: Proceedings of a conference. school of Agriculture and Land Resources Management, University of Alaska, Fairbanks. 208 pp.

• Oechel, W.C. and S.J. Hastings. 1983. The effects of fire on photosynthesis in chaparral resprouts. In: I.J. Kruger and W.R. Siegfried (eds.). Nutrients as determinants of the structure and functioning of mediterranean type ecosystems. Springer-Verlag, New York-Heidelberg-Berlin.

• Hastings, S.J. and W.C. Oechel. 1982. Photosynthesis and Water Relations of Mature and Resprout Chaparral Vegetation pp. 602. In: Eugence, C.C. and W.C. Oechel (eds.), Proceedings of the symposium on dynamics and management of Mediterranean-type ecosystems, June 22-26, San Diego, California. Gen. Tech. Rep. PSW-58. Berkeley, CA: Pacific Southwest Forest and Range Experiment Station, Forest Service, U.S. Department of Agriculture; 1982.

• Haas, L.W., S.J. Hastings, and K.L. Webb. 1981. Phytoplankton responses to the stratification-mixing cycle in the York Riverestuary during late summer, pp. 619-636. In: B.J. Neilson and L.E. Cronin (eds.), Estuaries and nutrients. Humana Press, Inc., Clifton, New Jersey.

• Hastings, S.J. 1980. Aspects of diel variation of 14CO₂Chlorella sp. population exposed to varying lengths of photoperiods. Master thesis, College of William and Mary, Williamsburg, Va.

• Oberbauer, S.F., W.C. Oechel, J.D. Tenhunen and S.J. Hastings. 1987. Impacts of variation in water and nutrient supply on photosynthesis and growth in Alaskan tundra. Bull. Ecol. Soc. Amer. 68(2).

• Marion, G.M., S.J. Hastings, S.F. Oberbauer and W.C. Oechel. 1987 Soil-plant nutrient relationships in a tundra ecosystem. Bull. Ecol. Soc. Amer. 68(2).

• Riechers, G.H., W.C. Oechel, and S.J. Hastings. 1985. Effects of elevated atmospheric carbon dioxide concentrations on tussock tundra at Toolik Lake, Alaska. Bull. Ecol. Soc. Amer. 66(2): 256.

• Hastings, Steven J. and Walter C. Oechel. 1984. Carbon balance of six arctic plant species grown under ambient and elevated CO₂ with high and low nutrient regimes. Bull. Ecol. Soc. 65(2).

• Evaluation of Vegetation Management and Weather Modification Plans for the Cachuma Lake Watershed, Santa Ynez River, California. Prepared for the California Department of Water Resources.

• Riparian Vegetation and Wildlife monitoring Study for Lundy (Mill Creek) Water Power Project. Prepared for Southern California Edison Company via subcontract with Advanced Sciences, Inc.