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Map 3.3: Landform types. Note that in this map some of the eleven basic landform types are further subdivided by aspect or location (see text) . 8 Resilient Sites for Terrestrial Conservation in the Northeast and Mid-Atlantic Region The Nature Conservancy • Eastern Conservation Science • Eastern Division • 99 Bedford St • Boston, MA 02111
Grouping Hexagons into Geophysical Settings: We tabulated the abundance and percentage of each physical element described above for each hexagon, and this information formed the basis for measuring similarity among hexagons. Specifically, we classified all hexagons into geophysical settings based on their geological composition (nine classes) and elevation zones (three classes); potentially 27 distinct settings (e.g. low elevation granite). First, we identified and tagged all the homogenous hexagons composed 80 percent or more of a single elevation zone and single geologic class. Second, we used a cluster analysis to assign the hexagons with more heterogeneous compositions into the most similar setting based on elevation, geology and landform. For example, a single hexagon, classified as high elevation granite, might be composed of: 90 percent high elevation granite 10 percent high elevation mafic 50 percent side slopes 35 percent steep slopes 15 percent summits 5 percent wet flat 0 percent all other attributes The above example could be assigned to a group by a simple query of attribute values and applying the 80 percent criteria, and this method worked for the vast majority of hexagons. For more heterogeneous hexagons we used quantitative clustering to determine which geophysical group the unclassified had the most attributes in common with. Clustering was performed using a hierarchical cluster analysis (PCORD, McCune and Grace 2002) using the Sorenson similarity index applied to the geophysical attributes (including landforms), using a flexible beta linkage technique with Beta set at ¬25 (McCune and Grace 2002). After clustering the samples, we performed an indicator species analysis (Dufrene and Legendre 1997) to identify the geophysical attributes that were the most faithful and exclusive to each setting. Because of the large size of the dataset, much of the clustering was performed in batches. The classified hexagons were then rejoined with the main coverage to create a single unified coverage. Results: The results indicated that one of the potential 27 settings did not occur in the region (i.e.. high elevation ultramafic); however, four other distinct settings were identified that consisted of intermixed complexes of two settings (low elevation granite and coarse sand) or extreme landforms (extremely steep slopes). In the end, we recognized 30 distinct geophysical settings, and assigned each of the 150,000+ hexagons into one of them. The settings are described and mapped below (Map 3.4), and evaluated in chapter 5. They included 15 low elevation settings, 8 mid elevation settings, 6 high elevation setting and 1 miscellaneous high slope setting. Resilient Sites for Terrestrial Conservation in the Northeast and Mid-Atlantic Region 9 The Nature Conservancy • Eastern Conservation Science • Eastern Division • 99 Bedford St • Boston, MA 02111
Page 1 and 2: Resilient Sites for Terrestrial Con
Page 3 and 4: Table of Contents Chapter 1 - Intro
Page 5 and 6: CHAPTER Introduction 1 Climate chan
Page 7 and 8: CHAPTER Defining Sites and 2 Geophy
Page 9 and 10: Landform Types (Map 3.3) The landfo
Page 11: Map 3.2: The nine geology classes u
Page 15 and 16: Descriptions of the Settings. The d
Page 17 and 18: Mid Elevation: Settings from 800’
Page 19 and 20: CHAPTER Estimating Resilience 3 A c
Page 21 and 22: Figure 3.1: Topographic position an
Page 23 and 24: Figure 3.3: The underlying slope an
Page 25 and 26: Map 3.1: Landform variety. This map
Page 27 and 28: Figure 3.4 a-d: A three-dimensional
Page 29 and 30: Map 3.3: Wetland density. This map
Page 31 and 32: Section 2: Landscape Permeability T
Page 33 and 34: oak forest to spruce forest) have b
Page 35 and 36: Figure 3.6: Detailed look at Kernel
Page 37 and 38: Figure 3.8: A gallery of satellite
Page 39 and 40: Section 3: Combining Resilience Fac
Page 41 and 42: through nodes or across edges. Unli
Page 43 and 44: Integration with Other Metrics: The
Page 45 and 46: CHAPTER Results: 5 Scores for the S
Page 47 and 48: Results by Setting: This section pr
Page 49 and 50: Map 5.1: Resilience scores for L-CO
Page 51 and 52: Map 5.2: Resilience scores for L-GR
Page 53 and 54: Map 5.3: Resilience scores for L-GR
Page 55 and 56: Map 5.4: Resilience scores for L-FI
Page 57 and 58: Map 5.5: Resilience scores for L-MA
Page 59 and 60: Map 5.6: Resilience scores for L-SE
Page 61 and 62: Map 5.7: Resilience scores for LSED
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Map 5.8 Resilience scores for L-CAL
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Map 5.9 Resilience scores for L-MOD
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Map 5.10: Resilience scores for LGR
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Map 5.11: Resilience scores for L-S
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Map 5.12: Resilience scores for L-
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LOW ELEVATION COASTAL SETTINGS Sett
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Map 5.13: Resilience scores for L-C
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Map 5.14: Resilience scores for L-C
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Map 5.15: Resilience scores for LCO
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MID ELEVATION SETTINGS Settings tha
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Map 5.16: Resilience scores for MGR
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Map 5.17: Resilience scores for M-M
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Map 5.18: Resilience scores for M-S
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Map 5.19: Resilience scores for M-C
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Map 5.20: Resilience scores for M-M
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Map 5.23: Resilience scores for L-
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HIGH ELEVATION SETTINGS Settings, u
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Map 5.24: Resilience scores for H-G
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Map 5.25: Resilience scores for H-S
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Map 5.27: Resilience scores for H-C
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Map 5.29: Resilience scores for ALP
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Map 5.30: STEEP- SED Resilient Site
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Figure 6.1. Estimated resilience an
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To account for the inherent differe
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Partial Ecoregions: Several other e
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Ecoregion Results For each wholly c
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Overlaying the ecoregional portfoli
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Map 6.2: Central Appalachians: Resi
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Map 6.4: Central Appalachians: Foca
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Map 6.6: Central Appalachians: Foca
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Map 6.7: Chesapeake Bay Lowlands: R
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Map 6.9: Chesapeake Bay Lowlands: F
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Map 6.11: Chesapeake Bay Lowlands:
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Map 6.12: High Allegheny Plateau: R
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Map 6.14: High Allegheny Plateau: F
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Map 6.16: High Allegheny Plateau: F
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Map 6.17: Lower New England: Resili
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Map 6.19: Lower New England: Focal
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Map 6.21: Lower New England: Focal
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Map 6.22: North Atlantic Coast: Res
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Map 6.24: North Atlantic Coast: Foc
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Map 6.26: North Atlantic Coast: Foc
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Map 6.27: Northern Appalachian: Res
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Map 6.29: Northern Appalachian: Foc
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Map 6.31: Northern Appalachian: Foc
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The amount of resilient area (the g
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Map 6.32: The highest scoring areas
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Map 6.34: Focal areas with high est
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Map 6.36: Networks of resilient sit
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Map 6.38: The highest scoring areas
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References Anderson M.G. and A. Oli
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NLDC 2001 National Landcover Databa
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Map I1.1: Geophysical Settings of t
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Map I1.3: Elevation Range in the No
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Map I1.5: Landscape Complexity of t
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Map I1.7: Regional flow patterns of
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Table 1. Ranges for elevation class
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attributes a simple matter. Compoun
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Recognizing the ecological importan
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Fig. 2: Landforms in Pawtuckaway St
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within the state. The data was expo
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APPENDIX Species Names IV Species N
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Clayton'S Copper Lycaena claytoni I
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Kirtland'S Snake Clonophis kirtland
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Ringed Bog Haunter Williamsonia lin
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Wild Calla Calla palustris Monocot
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