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Table 3 Average density of green crabs, rock crabs, soft shell clams and presence (+)/absence (−) of surrounding mussel beds, in oyster bed sites surveyed in 2014

From: Exploring the decline of oyster beds in Atlantic Canada shorelines: potential effects of crab predation on American oysters (Crassostrea virginica)

Estuary Site Green crab Rock crab SS clams Mussels
# trap−1 day−1 # trap−1 day−1 # sample−1 Pres/Abs
Boughton river 1 29.0 4.3 6.67
2 10.0 0.0 0.67
East river 1 14.3 0.0 4.00 ++
2 2.7 0.0 0.00 ++
North river 1 11.3 0.3 0.00 ++
2 0.0 23.0 0.00 +
Dunk river 1 0.0 0.0 2.33 +
2 0.0 0.0 0.00 +
Wilmot river 1 0.7 0.0 3.67 +
2 1.0 0.0 0.67 +
Kildare river 1 0.0 18.7 0.00
2 0.0 11.7 0.00
Hills river 1 0.0 0.3 8.67
2 0.0 0.0 7.67
Mill river 1 0.0 0.0 5.00
2 0.0 0.0 0.00
Cascumpec bay 1 0.0 9.7 0.00
2 0.0 4.3 2.33
Bideford river 1 0.0 0.0 0.00 +
2 0.0 0.0 2.33 +