Skip Navigation

Southern Oregon University

Joint Appointment in Biology and Environmental Studies

Sciences RM 380

1250 Siskiyou Blvd.

Ashland, OR  97520

(541) 552-6868





B. S. 1977 General Studies Tulane University, cum laude, with Honors in Biology
M. S. 1981 Plant Ecology Colorado State University
Ph.D 1984 Plant Ecology Colorado State University



Principles of Biology Evolution and Diversity (Bi212)

Introductory Ecology (Bi340)

Plant Ecology (Bi454/554)


Research Interests

California Red Fir (Abies magnifica) grows throughout the Sierra Nevada. A closely related red fir, Noble Fir (Abies procera), grows in the Cascades and Coast ranges of Washington and Oregon. In the Klamath Mountains and Cascades of southern Oregon and northern California grow trees of intermediate morphology. Many botanists have suggested that these intermediates are hybrids.  I am using DNA sequencing to investigate the phylogeny of the red fir complex up and down the West Coast. I hope to use genetic markers from the nuclear, chloroplast, and mitochondrial genomes. These separate genomes are inherited biparentally, paternally, and maternally, respectively, and so potentially allow us to determine which species contributed as pollen donor, egg donor, or both.



Welden, C. W. and R. A. Hossler. 2003..Evolution in the lab: Biocide resistance in E. coli. The American Biology Teacher 65:56-61.


Donovan, T. M. and Welden, C. W. 2001..Spreadsheet Exercises in Ecology and Evolution. 556 pp. Sinauer Assoc. Welden, C. W. 1999.. Using spreadsheets to teach ecological modeling. Bulletin of the Ecological Society of America 80:65-67.


Welden, C. W.,. S. W. Hewett, S. P. Hubbell, and R. B. Foster. 1991. Sapling survival, growth, and recruitment in relationship to canopy height in a neotropical forest. Ecology 72:35-50.



Welden, C. W., W. L. Slauson, and R. T. Ward. 1990.. Spatial pattern and interference in pinon-juniper woodlands of northwest Colorado. Great Basin Naturalist 50:313-319.



Welden, C. W., W. L. Slauson, and R. T. Ward. 1988.. Competition and abiotic stress among trees and shrubs in northwest Colorado. Ecology 69:1566-1577.


Sciences RM 226

1250 Sisikiyou Blvd.

Ashland, OR  97520

(541) 552-6798





Ph.D., Botany, University of California, Davis. 1992

M.S., Botany, University of California, Davis. 1989.

B.S., Forest Management, University of Washington. 1987.


Plant Physiology, (Bi 331)

Principles of Biology, (Bi211)

General Biology (Bi103)

Forest Ecology and Management (Bi386)

Biogeochemistry (Bi346)

Plant Form and Function (Bi434/534)

Introductory Ecology Lab (Bi340L)


Research Interests

My fundamental interests are in Plant Physiological Ecology with special reference to trees and forest ecosystems. The theme that binds my interests together is an interest in how the microenvironment of a plant influences its form and function. In particular, I have been interested in how plants acclimate and adapt to environmental heterogeneity with an emphasis on how those physiological and morphological characteristics affect survival and growth.  Recent projects have included stable isotopes in tree ring cellulose as indicators of plant water use and climate change, the effects of wind and leaf movements (leaf flutter) on canopy light dynamics and its impact on photosynthesis, the effects of elevated CO2 and temperature extreme events (global change) on tree seedling physiology, and the genotype/phenotype interactions of conifers in common garden experiments.     



Roden JS and JR Ehleringer (2000) Biochemical fractionation of hydrogen and oxygen isotopes in tree-ring cellulose is not temperature dependent. Isotopes in Environmental and Health Studies 36:303-317.

Roden JS, G Lin and JR Ehleringer (2002) Response to the comment of V.J. Terwilliger on "A mechanistic model for the interpretation of hydrogen and oxygen isotope ratios in tree-ring cellulose," by J.S. Roden, G. Lin, and J.R.Ehleringer 2000 Geochimica et Cosmochimica Acta 64:21-35. Geochimica et Cosmochimica Acta 66:733-734.

Helliker BR, JS Roden, C Cook and JR Ehleringer (2002) A rapid and precise method for sampling and determining the oxygen isotope ratio of atmospheric vapor. Rapid Communication in Mass Spectromotry 16:929-632.

Roden JS. (2003) Modeling the light interception and carbon gain of individual fluttering aspen (Populus tremuloides) leaves. Trees 17:117-126.

Barbour MM, JS Roden, GD Farquhar and JR Ehleringer (2004) Expressing leaf water and cellulose oxygen isotope ratios as enrichment above source water reveals evidence of a Péclet effect. Oecologia 138:426-435.


 Sciences RM 384

1250 Siskiyou Blvd.

Ashland, OR  97520

(541) 552-6799



Dr. Oline's home page




B.S. Physics (1985) Stanford University

Ph.D. Biology (2001) University of Colorado, 2001

Santa Fe Institute Complex Systems Summer School, 1997



Genetics (Bi341)

Evolution (Bi348)

Molecular Biology (Bi425)

The New Sciences of Complexity (Bi381)


Research Interests:

Dr. Oline is currently engaged in several projects involving population genetics and phylogeography in trees.  Recently he has looked at geographic variation in chloroplast haplotypes to search for evidence of a cryptic barrier between noble fir and California red fir - but instead the results pointed towards a broad zone of hybridization between the species as well as genetic differences between the two disjunct populations described as Shasta red fir.  He has also in the process of sequencing chloroplast DNA from populations of whitebark pine across a broad geographical area to try and determine some of the historical processess and gene flow.  He has also begun a collaboration with Emeritus Professor Darlene Southworth to link the above-ground phylogeography of Garry oak with the below-ground patterns of mycorrhizal diversity across the entire species' range. Dr. Oline is also interested in using molecular techniques to assess patterns of micobial biodiversity and biogeography in natural envioronments, and is currently investigating the microbial communities of unvegetated ultrahomogenous dry lakebeds as simple model systems for microbial biogeography.




Oline, D.K.  2008. Geographic variation in chloroplast haplotypes in the California red fir-noble fir species complex and the status of Shasta red fir.  Can. J. For. Res. 38:2705-2710.

Oline, D.K. 2006. Phylogenetic comparisons of microbial communities from serpentine soils.  Appl. Environ. Microbiol. 72(11):6965-6971.

Oline, D.K., S.K. Schmidt, and M.C. Grant.  2006.  Biogeography and landscape-scale diversity of the dominant Crenarchaeaota of soil.  Microbial Ecology 52(3):480-490.

Oline, D.K., and M.C. Grant. 2002. Scaling properties of biomass and soil properties: an empirical analysis. Landscape Ecology 17:13-26.

Oline, D.K., J.B. Mitton, and M.C. Grant. 2000. Population and subspecific genetic differentiation in the Foxtail Pine (Pinus balfouriana). Evolution 54(5):1813:1816.


Sciences RM 386

1250 Siskiyou Blvd.

Ashland, OR  97520

(541) 552-6788





B.A. Biochemistry, University of California, Berkeley, 1978

M.A. Biology, University of California, Santa Barbara, 1981

Ph.D. Microbiology and Immunology, University of California, Los Angeles, 1988


Elementary Microbiology (Bi214)

Microbiology (Bi351, Bi353)

Our Microbial World (Bi383)

Cell Biology (Bi342)

Immunology (Bi456/556)

Research Interests

Dr. Page's research is focused on Environmental Microbiology. She is isolating and characterizing novel bacterial species from diverse environmental sites such as Crater Lake and an abandoned copper mine. She is also interested in assessing microbial pollution problems that occur in regional waterways. 



English, F., K. Coffelt, J. Daomn-Tollenaere, J. Heglie, M. Plankenhorn, and K. Page.  2011.  Ashland Creek E. coli Study.  Rogue Riverkeeper, Ashland, OR.

Page, K. A., S.A. Connon, and S. J. Giovanoni.  2004.  Representative Freshwater Bacterioplankton Isolated from Crater Lake, Oregon.  Appl. Environ. Microbiol. 70:6542-6550.

Page, K.A., Liegler, T, and M.B. Feinberg. 1997. Use of a green fluorescent protein as a marker for human immunodeficiency virus type 1 infection. AIDS Res. and Hu. Retro. 13:1077-1083

Page, K.A., W. van Schooten, and M.B. Feinberg. 1997. Human immunodeficiency virus type 1 Nef does not alter T-cell sensitivity to antigen-specific stimulation. J. Virol. 71:3776-3787.

Miller, M.D., M.T. Warmerdam, K.A. Page, M.B. Feinberg, and W.C. Greene. 1995. Expression of the human immunodeficiency virus type 1 (HIV-1) nef gene during HIV production increases progeny particle infectivity independent of gp160 or viral entry. J. Virol. 69:579-584.


Sciences RM 371

1250 Siskiyou Blvd.

Ashland, OR  97520

(541) 552-6867




Ph.D. Biological Anthropology, Kent State University (1998)

M.A.  Anthropology, Kent State University (1992)

B. A. Anthropology, University of California, Berkeley (1989)



Human Anatomy and Physiology (Bi231, Bi232, Bi233)

Advanced Human Anatomy and Physiology (Bi361, Bi362, Bi363)


Research interests

My research has involved studies of early childhood growth and development in collaboration with the Women, Infants, and Children (WIC) program. These projects have identified patterns of infant growth associated with later obesity and has identified demographic factors related to inappropriate maternal weight gain during pregnancy. More recently, my research has focused on effects of psychosocial stress on the neuroendocrine system. In collaboration with undergraduate students in Biology, we have addressed effects of chronic stress on daily cortisol patterns. These projects have recruited undergraduate students in Anatomy and Physiology courses as participants. Our research has identified individual factors such as coping and emotion regulation that moderate effects of stress on endocrine responses.



May RL, Kim D, and D Mote-Waton (2013) Change in weight-for-length status during the
first three months: relationships to birth weight and implications for metabolic risk.
American Journal of Physical Anthropology 150:5-9.

May RL (2009) Maternal factors associated with smoking and inappropriate weight gain
during pregnancy. Open Epidemiology Journal 2:20-25.

May RL (2007) Pre-pregnancy weight, inappropriate gestational weight gain, and
smoking: relationships to birthweight. American Journal of Human Biology 19:305-310.