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EMERALD CHAPTER - NPSO MAY 1995 <br /> Data Analysis. Field sampling results were analyzed and high and low estimates (r = .20) <br /> were provided for a confidence level of 95 % (cc = .05) as follows: <br /> North portion: low = 5,817.7 high = 9,846.9 <br /> South portion: low = 1,244.3 high = 2300.9 <br /> Total low = 7,062.0 high = 12,147.8 <br /> Sampling intensity was done at the highest level possible considering budget limitations. The <br /> spread between the high and low estimates corresponds with the intensity of sampling. The <br /> average (mean) of the low and high estimates is 9605 flowering plants. Simply stated, we <br /> are 95% confident that the population estimate of 9605 is within about 26% of the actual <br /> number of flowering plants in the population. <br /> Map. Attachment B illustrates the outer perimeter of the main population, which is the focus <br /> of this study. It does not include "satellite" populations B -F censused last year for Louis <br /> Kroek in the Engineering Division (see Attachment D). The 370 -plus plants noted in B -F in - <br /> that project area included plants of all growth stages -- not just flowering plants. <br /> Furthermore, the plants were censused: i.e., all plants were counted, as opposed to the <br /> partial sampling method used in this study. <br /> Limitations. Some plants were probably eradicated by earthwork along the running trail <br /> prior to the survey. Field crews estimated about 200 -250 flowering plants were probably <br /> growing in the disturbed areas previous to the trail lighting project. No flowering plants <br /> were observed in the disturbed areas, and presence of non - flowering plants was not <br /> determined. <br /> The difficulty of deciding if multiple flowering stems are one plant or separate plants is <br /> inherent in counting Bradshaw's desert parsley and similar species. Lumping plants together <br /> for counting purposes or splitting them can make a significant difference. If the same field <br /> crew can be used in future counts, inconsistency in lumping /splitting technique can be <br /> minimized. <br /> Recommendations. The planned voluntary Habitat Conservation Agreement will contain <br /> detailed plans and management activities for the population. To assure the continued health <br /> of the population in the interim, the following simple guidelines are recommended: <br /> 1. avoid alterations to hydrology in the area of the population (filling, ditching, <br /> excavation, etc.); <br /> 2. maintain the current mowing timetable, which allows fruit to set before mowing; and <br /> 3. avoid construction projects, management activities, or recreational events which may <br /> disturb the plants, particularly during the growing season. <br /> Re- sampling of the population should be conducted in the future to monitor trends of the <br /> population. It may be possible to use the same transects used in this study, however, new <br /> transects may have to be established depending on statistical parameters and budgetary <br /> P. 3 <br /> SURVEY OF LOMA77UM BRADSHAW!! AT AMAZON PARK <br />