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Botanical Survey of Strawberry Lake, Arapaho National Forest, Grand County, Colorado

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Botanical Survey of Strawberry Lake, Arapaho National Forest, Grand County, Colorado Botanical Survey of Strawberry Lake, Arapaho National Forest, Grand County, Colorado Colorado Natural Heritage Program College of Natural Resources, 8002 Campus Delivery Colorado State University Fort Collins, Colorado 80523-8002 Botanical Survey of Strawberry Lake, Arapaho National Forest, Grand County, Colorado Prepared for: U.S. Forest Service Arapaho-Roosevelt National Forests and Pawnee National Grassland, Supervisor’s Office 240 West Prospect Fort Collins, CO 80526 Prepared by: Joe Rocchio and Joe Stevens January 21, 2004 Colorado Natural Heritage Program (CNHP) College of Natural Resources 8002 Campus Delivery Colorado State University Fort Collins, Colorado 80523-8002 Cover photograph: Floating mat dominated by Carex lasiocarpa with an understory of Sphagnum spp., Comarum palustris, Drosera rotundifolia, Carex interior, Carex buxbaumii, and Carex magellanica. Photo taken by: Joe Rocchio Prepared under U.S. Forest Service check-writing authority (<$2500) FY03; job code TRTR11. Table of Contents Table of Contents ..........................................................................................................2 List of Tables.................................................................................................................3 List of Figures................................................................................................................4 Introduction...................................................................................................................5 Natural Heritage Methodology................................................................................................ 7 Colorado Natural Heritage Program........................................................................................ 9 The Natural Heritage Ranking System ...................................................................................11 Methods....................................................................................................................... 24 Collect Available Information................................................................................................24 Conduct Field Surveys...........................................................................................................24 Wetland Functional Assessment ............................................................................................19 Delineate Potential Conservation Area Boundaries.................................................................24 Results ......................................................................................................................... 26 Strawberry Lake Potential Conservation Area ........................................................................27 Recommendations ....................................................................................................... 36 Literature Cited .......................................................................................................... 37 Appendix A: Strawberry Lake Species list ................................................................ 39 Appendix B: Ecological Specifications for Montane Fens......................................... 43 Appendix C: Photos (on enclosed CD-Rom) .............................................................. 47 Appendix D: Element Occurrence Records .............................................................. 51 2 List of Tables Table 1. Definition of Natural Heritage Imperilment Ranks........................................... 12 Table 2. Federal and State Agency Special Designations for Rare Species..................... 14 Table 3. Element Occurrence Ranks and their Definitions. ............................................ 15 Table 4. Natural Heritage Program Biological Diversity Ranks and their Definitions. ... 17 Table 5. Natural Heritage Program Protection Urgency Ranks and their Definitions...... 18 Table 6. Natural Heritage Program Management Urgency Ranks and their Definitions. 19 Table 7. Plant Specimens Collected............................................................................... 26 Table 8.Natural Heritage element occurrences of rare plants and plant communities at Strawberry Lake Fen PCA. ..................................................................................... 31 Table 9. Wetland functional assessment for the Strawberry Lake Potential Conservation Area........................................................................................................................ 33 3 List of Figures Figure 1. Strawberry Lake Project Location ...................................................................6 Figure 2. Strawberry Lake Potential Conservation Area. ............................................... 35 4 Introduction The Strawberry Lake analysis area is located in Grand County, approximately 10 miles east of the Town of Granby and within the Arapaho National Recreation Area (Figure 1). The site consists of a series of kettle ponds within an extensive wetland complex. The Strawberry Lake fen system was first cursorily assessed by the Forest Service for rare plants and plant communities in July, 2002, by several Forest Service staff, including Steve Popovich, the Forest Botanist (Joe Stevens personal communication with Steve Popovich, August, 2002). They recorded the presence of the sundew, marsh cinquefoil, Buxbaum’s sedge, and great bladderwort, the species at the time of visit they thought were most notable. They also noticed a variety of potentially uncommon sedge species, as well as the floating Sphagnum moss mats, and the presence of a fen system and related sedge areas and tufted hairgrass meadows. They recognized the need to more formally and thoroughly assess the area for botanical resources. They also noticed that the lake level was several feet below normal, and that the small pond near the southeast edge of the lake was rapidly drying. The areas supporting the sundew were wet and soggy, but dryer than normal. The visit marked the first documentation known to the Forest Service and CNHP of the area’s noteworthy vegetation. The U.S. Forest Service recently acquired the Strawberry Lake analysis area. In response to recently proposed activities in the analysis area, the Colorado Natural Heritage Program (CNHP) was contracted to conduct the following: 1. Conduct a botanical inventory of the Strawberry Lake analysis area; 2. Discuss importance of the fen; 3. Data interpretation and results overview; and 4. Management recommendations. This report summarizes results (species lists and site characterization) from both 2002 and 2003 site visits. The survey focused on identifying and recording the plant species encountered and characterizing the site conditions and ecological processes. Another site visit will be made during late spring/early summer of 2004. 5 Figure 1. Strawberry Lake Analysis Area Location Granby Strawberry Lake Analysis Area Projection: UTM, Zone13, NAD27 N Colorado Natural Heritage Program LEGEND Location in Study Area Colorado State University College of Natural Resources 254 General Services Building Fort Collins, CO 80523 map created 06 January 2004 Strawberry Lake # Disclaimer Analysis Area The data contained herein are provided on an as-is, as-available basis without warranties of any kind, expressed or implied, including (but not limited to) warranties of merchantability, fitness for a particular purpose, and non- USGS 7.5 Minute Series OR 30 x 60 Series Quadrangles* infringement. CNHP, Colorado State University Strawberry Lake, 4010517 and the State of Colorado further expressly Monarch Lake, 4010516 disclaim any warranty that the data are error- *Digital Raster Graphics produced by the free or current as of the date supplied. U.S. Geological Survey, 1996 Natural Heritage Methodology Just as ancient artifacts and historic buildings represent our cultural heritage, a diversity of plant and animal species and their habitats represent our “natural heritage.” Colorado’s natural heritage encompasses a wide variety of ecosystems from tallgrass prairie and shortgrass high plains to alpine cirques and rugged peaks, from canyon lands and sagebrush deserts to dense subalpine spruce-fir forests and wide-open tundra. These widely diversified habitats are determined by water availability, temperature extremes, altitude, geologic history, and land use history. The species that inhabit each of these ecosystems have adapted to the specific set of conditions found there. Because human influence today touches every part of the Colorado environment, we are responsible for understanding our impacts and carefully planning our actions to ensure our natural heritage persists for future generations. Some generalist species, like house finches, have flourished over the last century, having adapted to habitats altered by humans. However, many other species are specialized to survive in vulnerable Colorado habitats; among them are Bell’s twinpod (a wildflower), the Arkansas darter (a fish), and the Pawnee montane skipper (a butterfly). These species have special requirements for survival that may be threatened by incompatible land management practices and competition from non-native species. Many of these species have become imperiled not only in Colorado, but also throughout their range of distribution. Some species exist in less than five populations in the entire world. The decline of these specialized species often indicates disruptions that could permanently alter entire ecosystems. Thus, recognition
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