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<br />.. -?> <br /> <br />4. <br /> <br />Observed average densities of -3 mice/100m of stream length are believed <br />to apply to ditches <br />5% of any of these vegetation types would not represent a significant loss. <br />Mice are evenly distributed along ditches. <br /> <br />. <br /> <br />5. <br />6. <br /> <br />Team Recommendations: <br /> <br />1. The total maximum allowable area of disturbance ij) all habitat areas should be <br />not more than 3,270 ft2 (Confidence Level = Med). <br />2. Of this area, not more than 530 ft2 (23ft x 23ft) and not more than 23ft on a side, <br />can be in riparian shrublands (Confidence Level = High). <br />3. Not more than the 3,270 ft2 should be disturbed in an area encompassed by each <br />. 199 ft along a ditch extending perpendicular from the ditch on both sides 300 ft <br />(Confidence Level = Med). <br /> <br />CONCLUSION <br /> <br />: This white paper is based on the best scientific information available to the Science Team <br />at the time of production. There are clear data gaps indicated by this evaluation. More <br />research on the structure and distribution of PMlM in ditchside habitats are warranted. In <br />addition, autecological and behavioral $tudies would have provided valuable information. <br />Biotic and abiotic limiting factors are poorly known and would have also provided . <br />. invaluable information. Research on the consequences of land or water management <br />practices to PMlM would also address many pertinent issues. The discussion should <br />provide some guidance in the matter of a minimum occupied area and a maximum <br />allowable area of disturbance. While the areas prescribed appear small to most Science <br />Team members, we believe that they are defensible from the perspective of.the likelihood <br />of a detrimental impact and an acceptable standard for error. Please contact Chris .Pague <br />if you have any questions or need clarification. <br /> <br />Chris Pague, PMlM Science Team Leader <br />Conservation Scientist <br />The Nature Conservancy <br />1244 Pine Street <br />Boulder, CO 80302 <br />(303) 444-2950 <br />email: cpague@tnc.org <br /> <br />. <br /> <br />8 <br />