Distribution of overwash disturbance on Hog Island of the Virginia Coast Reserve 1974

Fahrig, L., B. Hayden and R. Dolan 1993. Distribution of barrier island plants in relation to overwash disturbance: A test of life history theory. J. Coastal Research. 9(2):403-412. From [e-mail] Thu Jun 11 10:22:56 1992 I am sending a file that is actually a SAS program for reading in the dataset that I used in the calculations. The columns are: map : base map number (i.e., the map number that Dolan/Hayden used for their rectangular blocks of coastline) trans : transect number from south to north for that map The remaining columns refer to a point on the transect at which there is a transition between vegetation communities (as defined by McCaffrey and digitized by LTER): utm1 : first utm co-ord for transition point utm2 : second utm co-ord for transition point unit : unit number for the vegetation community type that we are moving INTO. We are moving along the transect from the sea side to the mainland side of the island. The unit numbers are the numbers that you used when digitizing the map. For example, note that the first observation for every transect has unit number 7 since this is the number for sand. Editors note: Vegetation unit number refers to the mapping units used by McCaffrey, C.A. and R.D. Dueser. 1990. Plant associations on the Virginia Barrier Islands. Virginia Journal of Science 41(4A):282-299. The digital versions of the vegetation maps are also available on the VCR LTER information server. Unit numbers are listed below along with the corresponding vegetation class. GRID-CODE VEG_CODE VEG_CLASS
0 w Water/background
1 A Foredune Grassland
2 G Dense Grassland
3 AG Beachgrass Dunes/ Dense Grassland Dunes
4 g Sparse Grassland
5 Ag Foredune - Sparse Grassland Complex
6 At Open Dunes - Thicket Complex
7 B Beach
8 T Tall Thicket
9 AT Open Dunes - Thicket Complex
10 t Low Thicket
11 J Juniper Thicket
12 P Pine Forest
13 H Hardwood Forest
14 PH Pine-Hardwood Forest Complex
15 m Low Salt Marsh
16 Mm Upper Low Salt Marsh
17 M Brackish Marsh
18 s Salt Flat
19 F Fresh Marsh
20 w Open Water
21 dr Drift
22 b Submerged Sand
23 uw Underwater Flora (or Fauna)
24 peat "Peat" Outcrops
25 wf Wash Flat
26 mf Mud Flat dist : distance along the transect (from the sea) in m for that transition point prob : index of disturbance probability at that point (method of calculation in the ms)