JOHN R. SPENCE Glen Canyon NRA, PO Box 1507 , Page , AZ 86040 Email: John_Spence at nps.gov Education and affiliations M.Sc. Biology, Utah State University; Ph.D. in Botany, University of British Columbia, National Park Service ecologist, Glen Canyon National Recreation Area; Adjunct Faculty, Dept. Biological Sciences, NAU; Visiting Scientist, Arboretum at Flagstaff; Visiting Scientist, Royal Botanic Gardens, Sydney Australia; Participant, Flora of Australia Project; Participant, Flora of North America Project. Research interests Biogeography and evolution of Colorado Plateau flora, especially endemic and rare species; vegetation ecology and classification; bryophyte and vascular plant systematics; bird inventory, monitoring and ecology; ecological affects of climate change.   Current research Systematics of Bryum Flora of North America and Flora of Australia work Biogeography, ecology and floristics of hanging gardens of the Colorado Plateau Bryophyte flora of Arizona Rare plant studies on the Colorado Plateau Flora of the San Juan River Basin   Selected recent publications   Spence, J.R. 2001. Climate of the central Colorado Plateau , Utah and Arizona : Characterization and recent trends. Pp. 187-203 in Thomas, K. and Van Riper III, C. (eds.). Proceedings of the Fifth Biennial Conference on Research on the Colorado Plateau. U.S. Geological Survey Report Ser. USGSFRESC/COPL/2001/24 .   Spence, J.R. and H.P. Ramsay. 2002. The genus Anomobryum Schimp. (Bryopsida, Bryaceae) in Australia . Telopea 9: 777-792.   Spence, J.R. and B.A. Bobowski. 2003. 1994-1997 Water bird surveys of Lake Powell , a large oligotrophic reservoir on the Colorado River , Utah and Arizona . Western Birds 34: 133-148.   Spence, J.R.. 2005. New genera and combinations in Bryaceae (Bryales, Musci) for North America . Phytologia 87: 15-28.   Spence, J.R. 2005. New and interesting vascular plant species from Glen Canyon National Recreation Area, Arizona and Utah . Western North American Naturalist 65: 103-111.   Spence, J.R. and T. Corman. 2005. Geography, Climate and Habitats of Arizona . Pp. 19-43 In T Corman and C. Wise-Gervais (eds.). A rizona Breeding Bird Atlas. U. New Mexico Press, Albuquerque.   Spence, J.R. and H.P. Ramsay. 2005. Bryaceae. Flora of Australia , Vol. 51. Government Printing Office, Canberra (in press).   Holmes, J., J.R. Spence and M.K. Sogge. 2005. Birds of the Colorado River in Grand Canyon : a synthesis of status, trends and dam operation effects. Pp. 123-138 In Gloss, S.P., J.E. Lovich, and T.E. Melis (eds.). The state of the Colorado River ecosystem. U.S. Geological Survey Circular 128. 220 pp.   Shevock, J.R., J.R.Spence and L.R. Stark. 2005. Contributions toward a bryoflora of Nevada I. Madroño 52 : 66-71.