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Thalictrum heliophilum Wilken & DeMott (Cathedral Bluff meadow-rue): A Technical Conservation Assessment Prepared for the USDA Forest Service, Rocky Mountain Region, Species Conservation Project January 4, 2007 Susan Spackman Panjabi and David G. Anderson Colorado Natural Heritage Program Colorado State University Fort Collins, CO Peer Review Administered by Society for Conservation Biology Panjabi, S.S. and D.G. Anderson. (2007, January 4). Thalictrum heliophilum Wilken & DeMott (Cathedral Bluff meadow-rue): a technical conservation assessment. [Online]. USDA Forest Service, Rocky Mountain Region. Available: http://www.fs.fed.us/r2/projects/scp/assessments/thalictrumheliophilum.pdf [date of access]. ACKNOWLEDGMENTS This research was facilitated by the helpfulness and generosity of many experts, particularly Carla Scheck, Peggy Lyon, Renee Rondeau, Barry Johnston, and Tamara Meagley. Their interest in the project and time spent answering questions were extremely valuable and their insights into the distribution, habitat, and ecology of Thalictrum heliophilum were crucial to this project. Thanks also to Greg Hayward, Gary Patton, Kathy Roche, and Joy Bartlett for assisting with questions and project management. Thanks to Kimberly Nguyen for the work on the layout and for bringing this assessment to Web publication. Mary Olivas provided crucial financial oversight. Annette Miller provided information for the report on seed storage status. Drs. Ron Hartman and Ernie Nelson provided access to specimens of T. heliophilum at the Rocky Mountain Herbarium, and Jennifer Ackerfield provided access to specimens from the Colorado State University Herbarium. Nan Lederer and Tim Hogan provided valuable assistance and insights at the Colorado University Herbarium. Jessica Andersen assisted with data and literature acquisition. Special thanks to Karin Decker and Arvind Panjabi who reviewed part or all of the first draft of this document and offered input. Thanks also to Jen Krafchick, Cleome Anderson, Melia Anderson, Arvind Panjabi, Cameron Panjabi, and Donovan Panjabi for their support during the synthesis of this document. AUTHORS’ BIOGRAPHIES Susan Spackman Panjabi is a Botanist with the Colorado Natural Heritage Program (CNHP), at Colorado State University in Fort Collins. Ms. Panjabi’s work at CNHP includes building the international Biological Conservation Data System with information on the location and condition of 500 rare, threatened, and endangered plant species known to occur in Colorado. She has conducted biological inventories and rare plant surveys for various public agencies and private organizations such as the Bureau of Land Management, the U.S. Forest Service, Summit and Pitkin county planning departments, The Nature Conservancy, and the American Mountain Foundation. She has worked with CNHP for twelve years. Ms. Panjabi received her B.A. in Environmental Conservation from the University of Colorado, Boulder (1982) and her M.S. in Botany from the University of Vermont, Burlington (1993). David G. Anderson is a botanist with the Colorado Natural Heritage Program (CNHP). Mr. Anderson’s work at CNHP includes inventory and mapping of rare plants throughout Colorado, mapping weeds, maintaining and updating CNHP’s database, and writing reports on the rare plants of Colorado. He has worked with CNHP since 1999. Much of Mr. Anderson’s prior experience comes from five years of fieldwork studying the flora and ecosystem processes of the Alaskan and Canadian Arctic. Mr. Anderson also served in the Peace Corps as a science teacher in the Solomon Islands from 1996 to 1998. Mr. Anderson received his B.A. in Environmental, Populational, and Organismic Biology from the University of Colorado, Boulder (1991) and his M.S. in Botany from the University of Washington, Seattle (1996). COVER PHOTO CREDIT Thalictrum heliophilum (Cathedral Bluff meadow-rue). Photograph by Susan Spackman Panjabi. 2 3 SUMMARY OF KEY COMPONENTS FOR CONSERVATION OF THALICTRUM HELIOPHILUM Status Thalictrum heliophilum Wilken & DeMott (Cathedral Bluff meadow-rue) is a narrowly endemic vascular plant whose global distribution is limited to an approximately 32 by 40 mile (52 by 64 km) area in the Colorado River drainage in northwestern Colorado. Found in dry shale barren communities between 6,200 and 8,800 ft. (1890 and 2682 m) elevation, this species is known from 18 occurrences in three counties. The global population is estimated to be fewer than 200,000 plants within 2,000 acres (roughly 3 square miles) of occupied habitat. Although it is likely that more occurrences will be found by additional inventories, it is not likely that the species will be found to be common, even within its narrow range. When we began writing this assessment, Thalictrum heliophilum was ranked globally vulnerable (G3) by NatureServe and the Colorado Natural Heritage Program. This study provided us with the information to support a rank change to globally imperiled (G2). Region 2 of the USDA Forest Service has designated T. heliophilum a sensitive species, but only one of the 18 known occurrences is located on National Forest System land. Thalictrum heliophilum is also found on lands managed by the Bureau of Land Management (BLM) and the Department of Energy, and on private lands, but it is not included on the BLM Colorado State Sensitive Species List, nor is it listed as threatened or endangered under the Federal Endangered Species Act. Primary Threats There are several threats to the persistence of Thalictrum heliophilum, including oil shale mining, oil and gas development, exotic plant species invasions, small population size, grazing and trampling by wild ungulates, and climate change. This species is restricted to substrates that contain high quality oil shale and are underlain by rich deposits of oil and natural gas. Twelve of the 18 known T. heliophilum occurrences are on private land, mostly owned by large oil companies (e.g., UNOCAL, Exxon, Occidental Oil, Getty Oil, Texaco Oil, Mobil Oil). Oil and gas development is increasing dramatically within the range of T. heliophilum. Oil shale development is happening on a small scale within the range of T. heliophilum and is likely to increase in the near future. Weed invasions are also evident in this species’ habitat. The primary threat to T. heliophilum on National Forest System land appears to be browsing and trampling by wild ungulates. Primary Conservation Elements, Management Implications and Considerations Research is needed to understand the threats to Thalictrum heliophilum, and threat mitigation is needed to ensure that no occurrences are lost. Additional species inventories are a high priority for this species and are likely to identify new occurrences. A landscape-level approach to conservation of T. heliophilum is not likely to be effective given its tiny global range, specific habitat requirements, and small number of occurrences. Although T. heliophilum habitat is steep and highly erosive, plants are rhizomatous and well suited to withstand natural disturbance. Research is needed to investigate the population biology and autecology of T. heliophilum so that conservation efforts on its behalf can be most effective. Land ownership patterns within the range of Thalictrum heliophilum are complex. Despite its narrow range, this species is found on lands administered by the BLM (White River, Grand Junction, and Glenwood Springs Resource Areas), the Department of Energy, the USFS (White River and Grand Mesa national forests), and numerous private landowners, including several oil companies. Two of the occurrences fall partially within the East Douglas Creek and South Cathedral Bluffs Areas of Critical Environmental Concern, which the BLM administers. South Cathedral Bluffs is also a designated Colorado Natural Area. Another occurrence is found within a Colorado Natural Area at Mount Callahan; this area is on private land and is managed in cooperation with Occidental Oil Company. 2 3 TABLE OF CONTENTS ACKNOWLEDGMENTS ..............................................................................................................................................2 AUTHORS’ BIOGRAPHIES .........................................................................................................................................2 COVER PHOTO CREDIT .............................................................................................................................................2 SUMMARY OF KEY COMPONENTS FOR CONSERVATION OF THALICTRUM HELIOPHILUM .....................3 Status..........................................................................................................................................................................3 Primary Threats..........................................................................................................................................................3 Primary Conservation Elements, Management Implications and Considerations.....................................................3 LIST OF TABLES AND FIGURES ...............................................................................................................................6 INTRODUCTION ..........................................................................................................................................................7 Goal of Assessment....................................................................................................................................................7 Scope of
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