Sensitive Ecosystems Inventory: Lake Country, 2005 Volume 2: Terrestrial Ecosystem, Terrain, Terrain Stability, and Surface Erosion Mapping, and Expanded Legend February 2006 Kristi Iverson, Iverson & MacKenzie Biological Consulting Ltd. Polly Uunila, Polar Geoscience ii Acknowledgements The project was funded by The Real Estate Foundation of BC1, the BC Ministry of Environment, and the District of Lake Country. Project management was provided by Kristi Iverson2 and Mike Reiley3. Field work was completed by Kristi Iverson, Polly Uunila4, Mike Sarell5 and Allison Haney5. Helen Davis6 completed landowner contact. Draft bioterrain mapping was completed by Robert Maxwell, and final bioterrain mapping, terrain stability and erosion potential mapping was completed by Polly Uunila, P.Geo. Ecosystem mapping was completed by Kristi Iverson, R.P.Bio. Bon Lee7 completed monorestitution and cartography work. This project has adapted material from the reports for the Bella Vista – Goose Lake Range Sensitive Ecosystems Inventory and Central Okanagan Sensitive Ecosystems Inventory. We would like to thank the many landowners that gave us permission to access their lands for field sampling. 1 The mission of the Real Estate Foundation is to support sustainable real estate and land use practices for the benefit of British Columbians. 2 Iverson & MacKenzie Biological Consulting Ltd. 3 District of Lake Country 4 Polar Geoscience 5 Ophiuchus Consulting 6 Artemis Wildlife Consultants 7 Baseline Geomatics Inc. iii Introduction This report presents detailed information on ecosystems in the Lake Country of the Central Okanagan. It is the second volume in a series of three volumes. Volume 2, this report, provides detailed information on terrestrial ecosystem mapping (TEM) methods and gives descriptions of each of the ecosystems that occur within the sensitive ecosystems or other important ecosystems categories described in Volume 1. Appendix B of Volume 1 provides tables that can be used to cross-reference between sensitive and other important ecosystems units and terrestrial ecosystem map units in this report. This report describes the natural setting of the study area and details methods, results and recommendations for bioterrain mapping and ecosystem mapping. It is intended for use by professionals that require more detailed ecological and terrain information. It is recommended for use by people interested in developing other interpretive map themes from the ecosystem or terrain mapping. Volume 18 is intended for people and organizations that need information to help conserve and protect remaining sensitive and important ecosystems in the District of Lake Country and other similar areas. It is also intended to provide information and advice to landowners and developers on how to minimize and avoid possible degradation of sensitive ecosystems due to land use and development activities. Volume 39 contains wildlife habitat mapping themes developed from the terrestrial ecosystem mapping (TEM) for the following ten species: Great Basin Spadefoot (Spea intermontana), Painted Turtle (Chrysemys picta), Western Rattlesnake (Crotalus oreganus), Gopher Snake (Pituophis catenifer ssp. deserticola), Western Screech-owl (Otus kennicottii ssp. macfarlanei), Long-billed Curlew (Numenius americanus), Yellow-breasted Chat (Icteria virens), Grasshopper Sparrow (Ammodramus savannarum), Swainson’s Hawk (Buteo swainsonii), Spotted Bat (Euderma maculatum) and Badger (Taxidea taxus jeffersonii). All of these species are considered at risk in the province of B.C. and most are listed under the federal Species at Risk Act. These species provide a cross-section of threatened or endangered amphibians, reptiles, birds, and mammals that depend on a range of different ecosystems in the study area. There are many other threatened and endangered species that likely occur in the study area and are listed in each ecosystem chapter of Volume 1. Wildlife habitat mapping portrays the potential importance of each ecosystem to specific animal species through a species-habitat model. The model assigns ratings to different ecosystem units from the TEM based on the needs of the species for particular life requisites. These ratings are displayed on the wildlife habitat maps. Volume 3 is intended for professionals who require more detailed information on wildlife habitat values in the study area than Volume 1 provides. 8 Iverson 2006 9 Haney and Sarell 2006 iv Table of Contents ACKNOWLEDGEMENTS .......................................................................................................................III INTRODUCTION...................................................................................................................................... IV TABLE OF CONTENTS.............................................................................................................................V LIST OF FIGURES.................................................................................................................................... VI LIST OF TABLES...................................................................................................................................... VI 1 STUDY AREA..................................................................................................................................... 1 1.1 LANDSCAPE SETTING ................................................................................................................... 2 Bedrock Geology................................................................................................................................... 2 Landscape Evolution............................................................................................................................. 4 Soils....................................................................................................................................................... 4 Climate.................................................................................................................................................. 5 Ecoregional and Biogeoclimatic Classification.................................................................................... 6 1.2 ECOLOGY AND DISTURBANCE PROCESSES ................................................................................... 7 1.3 HUMAN HISTORY ......................................................................................................................... 8 2 METHODS AND LIMITATIONS .................................................................................................... 9 2.1 TERRESTRIAL ECOSYSTEM MAPPING ........................................................................................... 9 Preliminary Terrain Mapping............................................................................................................... 9 Field Sampling.................................................................................................................................... 11 Final Terrain Mapping ....................................................................................................................... 12 Expanded Legend Development.......................................................................................................... 12 Site Series and Site Unit Mapping ...................................................................................................... 13 Data Management............................................................................................................................... 14 2.2 TERRAIN STABILITY ................................................................................................................... 15 Terrain stability Criteria..................................................................................................................... 16 2.3 EROSION POTENTIAL.................................................................................................................. 18 Erosion Potential Criteria .................................................................................................................. 18 2.4 MAPPING LIMITATIONS .............................................................................................................. 20 TEM & SEI Mapping Limitations ....................................................................................................... 20 Terrain Mapping Limitations.............................................................................................................. 21 Terrain Stability and Erosion Potential Mapping Limitations............................................................ 22 3 RESULTS .......................................................................................................................................... 23 3.1 TERRESTRIAL ECOSYSTEM MAPPING ......................................................................................... 23 3.2 TERRAIN, TERRAIN STABILITY, AND EROSION POTENTIAL RESULTS ......................................... 26 3.3 TERRAIN RECOMMENDATIONS ................................................................................................... 28 REFERENCES ........................................................................................................................................... 30 APPENDIX A: FIELD PLOT FORMS....................................................................................................33 APPENDIX B: VEGETATION SPECIES LIST....................................................................................