Ecological Archives M084-022-A1

Elizabeth S. Bryson, Geoffrey C. Trussell, Patrick J. Ewanchuk. 2014. Broad-scale geographic variation in the organization of rocky intertidal communities in the Gulf of Maine. Ecological Monographs 84:579–597. http://dx.doi.org/10.1890/13-1106.1

Appendix A. Study sites, listed from south to north, used to assess natural community structure.

Study sites, listed from south to north, used to assess natural community structure. Sites are categorized based upon oceanographic region (Southern, Penobscot or Northern) and wave energy (Sheltered, Wave-exposed). The wave exposure of each site (sheltered vs. exposed) was characterized based on personal observations of coastal topography (e.g., headlands vs. bays) and wave action during calm and stormy periods at all sites. We intentionally chose sites that were as distinct as possible in terms of prevailing wave energies and for those sites where we had less field experience, we used the dissolution rate of plaster clod cards as an additional means of characterizing flow (see Bertness et al. 2002 for methodological approach). Briefly, three, pre-weighed, cylindrical clod cards attached to vexar mesh were bolted to the substratum within the mid-intertidal zone at each site in mid-July 2011. Initial clod card mass ranged between 45.36 and 59.65 g. Clod cards were retrieved 2 days after deployment (4 tidal cycle duration) and re-weighed. The total mass lost during deployment was converted to the percent mass lost per tide. Latitude and longitude of each site are presented in decimal degrees. Clod card dissolution rate was not measured at sites that have been extensively studied by the authors and others.

Location

Region

Wave Energy

Dissolution Rate (% Mass Loss/Tide)

Turrett, Nahant, MA

Southern

Wave-exposed

5.32%

Cunner Ledge, Nahant, MA

Southern

Wave-exposed

N/A

East Point, Nahant, MA

Southern

Wave-exposed

N/A

Canoe Beach, Nahant, MA

Southern

Sheltered

N/A

Forty Steps, Nahant, MA

Southern

Sheltered

N/A

Past Forty Steps, Nahant, MA

Southern

Sheltered

N/A

Lobster Cover, Manchester-by-the-Sea, MA

Southern

Sheltered

N/A

Pigeon Cove Point, Rockport, MA

Southern

Wave-exposed

5.90%

Lighthouse, Cape Neddick, ME

Southern

Wave-exposed

5.34%

Two Lights, Cape Elizabeth, ME

Southern

Wave-exposed

4.81%

Giant Steps, Bailey's Island, ME

Southern

Wave-exposed

6.22%

Pemaquid Point, ME

Southern

Wave-exposed

N/A

Chamberlain Point, ME

Southern

Wave-exposed

N/A

Chamberlain East, ME

Southern

Wave-exposed

N/A

Chamberlain Bay, ME

Southern

Sheltered

3.01%

Marshall Point Light, Port Clyde, ME

Penobscot

Sheltered

3.31%

Bass Harbor, Mt. Desert Island, ME

Penobscot

Wave-exposed

4.90%

Otter Point, Mt. Desert Island, ME

Penobscot

Wave-exposed

5.04%

Newport Cove, Mt. Desert Island, ME

Penobscot

Sheltered

3.41%

Bar Harbor Shore Path, Mt. Desert Island, ME

Penobscot

Sheltered

3.14%

Grindstone Neck, Winter Harbor, ME

Penobscot

Sheltered

3.44%

Frazer Point Picnic Area, Winter Harbor, ME

Penobscot

Sheltered

3.50%

Schoodic Point, Winter Harbor, ME

Penobscot

Wave-exposed

5.75%

McLellan Park, Milbridge, ME

Penobscot

Wave-exposed

4.82%

Town Landing, South Addison, ME

Penobscot

Sheltered

2.52%

Roque Bluffs, Machias, ME

Northern

Sheltered

2.74%

Western Head, Cutler, ME

Northern

Wave-exposed

4.75%

Steamboat Wharf, Cutler, ME

Northern

Sheltered

2.51%

Hamilton Cove, Lubec ME

Northern

Wave-exposed

5.20%

Carrying Cove, Lubec, ME

Northern

Sheltered

2.53%

Quoddy Head, Lubec, ME

Northern

Wave-exposed

4.96%

Quoddy Lighthouse, Lubec, ME

Northern

Wave-exposed

5.77%

North of Quoddy, Lubec, ME

Northern

Sheltered

2.52%

Coast Guard Station, Lubec, ME

Northern

Sheltered

2.83%


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