Principal Investigator Steven Perakis Research Ecologist My research examines the ecology and biogeochemistry of temperate forest, grassland and riparian ecosystems. Read more about individual projects on the Research pages. Link to Steve’s Bio Link to OSU Faculty Page

Research Staff
	Chris Catricala Lab Manager M.S. Univ. of New Hampshire - Hydrology B.S. State University of New York, College of Environmental Science & Forestry - Forest Biology My research interests focus on the biogeochemistry of terrestrial ecosystems, with an emphasis on hydrological linkages between terrestrial and aquatic ecosystems with respect to nutrient cycling. phone: 541-758-8825 ccatricala - at - usgs.gov
	Aaron Thiel Ecologist M.S. Oregon State University – Forest Science B.S. University of Wisconsin at Madison – Zoology and Botany aaron.thiel - at - oregonstate.edu

---

Post Docs and Students

Stephanie Yelenik Post-doc, OSU Forest Ecosystems and Society Ph.D. UC Santa Barbara, M.S. University of Cape Town, B.S. UC Berkeley My research largely focuses on feedbacks between plant community dynamics and soil nutrient cycling. Past work has explored the role of species specific effects on N cycles on the persistence of exotic plants, as well as the ability of native species to re-establish. At OSU, I am comparing the degree to which N-fixing shrubs are competitors or facilitators of conifers through forest succession. This is part of a project quantifying N-fixation in the Klamath-Siskiyou Douglas-fir forest zone of southwestern Oregon and northwestern California. I am especially interested in how the net balance of positive and negative interactions changes along rainfall gradients, as limiting resources may shift between nitrogen and water. stephanie.yelenik - at - oregonstate.edu

Jenny Dauer Ph.D. Student, OSU Forest Science M.S., B.S., Penn State University My research examines biogeochemical cycling of nutrients in forests of the Oregon Coast Range. I'm interested in understanding the relationship between soil nutrient status and tree health, especially with regards to calcium, which is often overlooked in this region. I seek to differentiate soil pools of calcium and their availability for tree uptake and to understand the long-term retention of calcium in the ecosystem. In conjunction, I am investigating mechanisms of natural abundance calcium stable isotope fractionation. jenny.dauer - at - oregonstate.edu

---

Lab Alumni

Post-Doctoral:

Chev Kellogg: chevkellogg@gmail.com

Graduate Students:

Emily Scott: scottemi - at - msu.edu
MS 2004: Use of d¹⁵N and d¹³C to Analyze Food Webs and Identify Source-Sink Relationships in Riparian Canopy Vegetation of the Oregon Coast Range

Tom Giesen: tom- at - giesen.net
MS 2006: Four Centuries of Soil Carbon and Nitrogen Change After Severe Fire in a Western Cascades Forest Landscape

Stephanie Hart: stephanie.hart- at - oregonstate.edu

MS 2006: Riparian Litter Inputs to Streams in the Central Oregon Coast Range

Alison Cross: alc58- at - cornell.edu

MS 2006: Tree Species – Soils Relationships in Old-Growth Forests of the Oregon Coast Range

Emily Sinkhorn: emily.sinkhorn - at - oregonstate.edu

MS 2007: Non-Linear Nitrogen Dynamics and Calcium Depletion along a Temperate Forest Soil Nitrogen Gradient

Aaron Thiel: aaron.thiel - at - oregonstate.edu

MS 2008: Nitrogen Dynamics Across Silvicultural Canopy Gaps in Young Forests of Western Oregon.

Joselin Matkins: joselin.ssrlt - at - gmail.com

MS 2009: Decomposition of Red Alder and Douglas-fir Leaf Litter in Oregon Coast Range Riparian Forests

Tiffany van Huysen: tlvanhuysen - at - ucdavis.edu

PhD 2009: Nitrogen and Phosphorus Dynamics during Decomposition of Multiple Litter Types in Temperate Coniferous Forests

Carlos Sierra: csierra – at - bgc-jena.mpg.de

PhD 2009: Environmental variability and system heterogeneity in terrestrial biogeochemical models

Staff:

Jake Adams: jaked79 - at - hotmail.com

Emily Beamguard: erbal477 - at - yahoo.com

Sarah Beldin: sbeldin - at - usgs.gov

Justin Brant: jbbrant - at - gmail.com

Kent Davis: daviske - at - science.oregonstate.edu

Hayley Grant: granth - at - onid.orst.edu

Alex Irving: alex.irving - at - oregonstate.edu

Katie James: james.katie - at - gmail.com

Brooke Kaye: kayebrooke - at - gmail.com

Morgan Luce: morgan.luce - at - nau.edu

Stephanie McAfee: mcaf - at - alum.dartmouth.org

Melissa McCartney: melissamccartney - at - hotmail.com

Trish Thoms: trishathoms - at - yahoo.com

---

U.S. Department of Interior, U.S. Geological Survey
Forest and Rangeland Ecosystem Science Center
URL: http://fresc.usgs.gov/
Contact: fresc_webmaster@usgs.gov
Last Update: January 25, 2003
USGS Disclaimer || Accessibility