Maps of the varieties of the Florida tree snail Liguus fasciatus with vegetation, roads, and county overlays.
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Caveats: This program may not work properly in AOL's browser. As far as we know it works correctly in Internet Explorer, Netscape, and FireFox. Also, once you go to the maps, there is no obvious way to get back here or to home! (we're working on it; you can hit the back page on the browser repeatedly and it will eventually return here but it is annoying)
We suggest you print out this page and follow the primer below to get a feel for how the map works. See the primer on Ohio Mussel Atlas for more thorough instructions.
Data sources: Division's 1,600+ lots; Emmel & Cotter, 1995; Pilsbry, 1946; Close, 2000. Map overlays from Florida Geographic Data Library (http://www.fgdl.org/). Because ligs have been moved around since 1950, only records prior to 1951 have been used.
You will notice icons on the left side, a small overview map, the main map, the available layers on the right, and a blank information panel at the bottom. Below the layers is the Refresh button (scroll down to access).
The icons (L to R, top to bottom) are: toggle between layers and legend, turn on or off the overview map, zoom in by drawing a box or just clicking it, zoom out by clicking, go to maximum extent of all layers, go to maximum extent of active layer, go to previous extent, pan, information, query, erase queried/selected features. Placing the cursor over these buttons will show their function.
The layers have two selectable columns – Visible and Active. Visible means the layer will be seen when you refresh the map. Active means that layer is the searchable layer - you can get addition information and perform searches on it. A layer must be visible as well as active to be searched, but visible layers need not be active. Only one layer may be active at a time but any or all layers may be simulataneously visible.
Try this primer:
1). Toggle the layer/legend icon to legend. This explains the colors of the vegetation layer, among other things. Switch back to layer mode.
2) In the layers, scroll down to Liguus Hammocks and click to make it visible and active. Click refresh map. All hammocks used in this study are now visible.
3) Make All Major Roads visible and active. Click refresh map. Click the Information icon and then click a road. Details of the road are shown at the bottom. Click another road. Note that the previous information is replaced by the new data. You can clear the information panel by clicking the eraser icon as well.
4) You can display all roads (not just the major ones) by selecting any or all county road layers, but these will take a while to draw. Make Miami-Dade County roads visible and active. Click the Zoom In tool (the magnifying glass with the plus sign). Draw a box around wonderful Miami. Keep zooming in a couple of times. Unfortunately, the existing county road layers do not give street or road names when you click on them, although the All Major Roads layer does.
5) Make County Lines visible and active. Refresh. Note that to return to the full extent of the map you need to click either the Zoom Out icon or Zoom to Full Extent icon - the latter is the easiest. You can also zoom to the extent of the active layer (see icon) if you want to limit your view. Click the Information icon and click anywhere within a county. Information on the county is displayed.
6) Make the Liguus Hammocks visible and active. Refresh. Click the Information icon. Click on any hammock dot. The following information is displayed:
a) Record number. Ignore.
b) Group name. Hammocks are organized into groups - Pinecrest, Cape Sable, etc.
Each group has its own numbering system.
c) Number. If two hammocks are very close to each other, more than one may be
displayed.
d) Longitude and Latitude in UTMs.
e) In alphabetical order, the "varieties" found at that hammock. Zero indicates
absence; anything > 0 indicates presence. Numbers > 0 are coded for data origin
for housekeeping reasons - they do not indicate numbers of specimens, rarity,
etc.
f) Total number of varieties.
7) The remaining layers are pre-set searches for each of the varieties for which we have records. Make Wintei visible and active. Refresh. Click on the hammock to get information. You can view the varieties with or without any of the other layers (leave the Vegetation on, it is the base map)
8) Make Liguus Hammocks visible and active, clear any other visible varieties, and refresh. Zoom out to the active layer. Click the query icon. This is by far the most powerful part of the program. Try these:
a) Under Field choose Group. In Value type Pinecrest. Click
Add to Query String and Execute. The Pinecrest group is displayed in red. The records are given in the table. At the end of the table click
“zoom to these records.” On the left side of the table are record #'s. Click on
a record. This zooms in and centers that record in purple. You can get the usual
information by clicking any of the dots.
b) Zoom back out. You can do complex searches as well. Under Field choose Group. In Value type
Pinecrest. Click Add to Query String. Click AND. Under Field choose Number and
Value = 29. Add to Query and execute. Pinecrest 29 is displayed in red.
b) Zoom back out. Total_form is the number of varieties occurring in a hammock. Try this
search: Total_form > 15. Over 15 varieties have been recorded from this hammock.
c) Using the AND or OR operators, you can look for associations of items.
You can find hammocks having both Cingulatus and Castaneus for example, or
Atlantic Coast hammocks having Barbouri (look for barbouri > 0).
The available Fields are:
a) Group. The Hammock group name, either Collier, Long Pine
Key, Pinecrest, Cape Sable, Atlantic Coast, Marco Island, or Florida Keys.
b) Number. Hammock number within a group.
c) Name. Some hammocks have names as well as Group and number designations, like
Flamingo or Homestead.
d) Catalog. OSUM catalog numbers for specimens.
e) Long and Lat. Coordinates in UTMs.
f) Variety names.
g) Total_form. Total number of varieties in hammock.
h) #ID#. Ignore.
Notes:
Please notify us of any problems. There are
a few issues of which we are aware:
a) That lone hammock in northernmost Collier County (Collier 26) is probably
bogus. Since it is also called Pinecrest 141 in our data, it will be moved if we
can verify the account.
b) The Long Pine Key hammocks should occur on the "island" of slash pine - you
can see the outline has been shifted south. Because the roads line up correctly
with our points, and our points are based on verified longitudes and latitudes,
we suspect that the vegetation map may be skewed in this region.