. Assessing the natural range of variability in minimally disturbed wetlands across the Rocky Mountains : the Rocky Mountain ReMAP project. Wetlands; Wet meadow ecology; Shrubland ecology; Flowers. Table 13. Number of sites and percentage classes of assessment area with one vegetation stratum, two overlapping vegetation strata, or three or more overlapping vegetation strata. Percent of AA with Number Percent of AA with Number Percent of AA Number three or more of Sites two overlapping of Sites with one of Sites overlapping strata vegetation strata vegetation strata >=75 4 >=75 8 >=75
. Assessing the natural range of variability in minimally disturbed wetlands across the Rocky Mountains : the Rocky Mountain ReMAP project. Wetlands; Wet meadow ecology; Shrubland ecology; Flowers. Table 13. Number of sites and percentage classes of assessment area with one vegetation stratum, two overlapping vegetation strata, or three or more overlapping vegetation strata. Percent of AA with Number Percent of AA with Number Percent of AA Number three or more of Sites two overlapping of Sites with one of Sites overlapping strata vegetation strata vegetation strata >=75 4 >=75 8 >=75 44 <75 to 50 2 <75 to 50 11 <75 to 50 10 <50 to 25 4 <50 to 25 11 <50 to 25 11 <25 to 5 13 <25 to 5 23 <25 to 5 12 <5 9 <5 3 <5 0 Figure 4. Horizontal interspersion of vegetation zones diagram. • N2/R2: Moderate degree of horizontal interspersion: AA characterized by a moderate array of nested or interspersed vegetation zones with no single dominant zone. • N3/R3: Low degree of horizontal interspersion: AA characterized by a simple array of nested or interspersed vegetation zones. One zone may dominate others. • N4/R4: No horizontal interspersion: AA characterized by one dominant vegetation zone. In general, riparian shrublands had the highest de- gree of horizontal interspersion (Table 14). Emer- gent marshes had low to no horizontal intersper- sion. Most wet meadow sites also showed low to no horizontal interspersion, although about a third were split between high and moderate intersper- sion. Fens ranged primarily from moderate, low, to no horizontal interspersion. No clear ecoregional patterns were evident. Structural Patch Types Many rapid assessment methods have metrics deal- ing with patch number and/or patch interspersion. The metrics assume that high quality wetlands are naturally patchy and that patchiness is lost as hu- man disturbance intensifies. However, in our study, the number of structural patch types by ecological syst
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