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Table 2 Filtration by historic and present oyster populations, and for 1 ha of oyster ground at either historic or present oyster densities

From: Quantifying the Loss of a Marine Ecosystem Service: Filtration by the Eastern Oyster in US Estuaries

Estuary State Historic volume filtered (1,000 m3 h−1) Present volume filtered (1,000 m3 h−1) Historic area (ha) and density (ind m−2) Present area (ha) and density (ind m−2) Volume filtered by 1 ha at historic density (1,000 m3 h−1) Volume filtered by 1 ha at present density (1,000 m3 h−1)
Hudson River/Raritan Bay NY/NJ 1,604 (0.07) 272 (0.01) 1,660 (17.5) 402 (15.5) 0.97 0.68
Delaware Bay NJ/DE 23,718 (0.36) 7,567 (0.11) 25,149 (17.5) 11,471 (15.5) 0.94 0.66
Tangier and Pocomoke Sound MD/VA 3,718 (0.31) 3,014 (0.25) 35,536 (1.5) 7,126 (11.9) 0.10 0.42
York River VA 727 (0.24) 109 (0.04) 698 (19.2) 161 (14.8) 1.04 0.68
James River VA 4,993 (0.47) 766 (0.07) 4,467 (14.5) 2,410 (8.4) 1.12 0.32
Apalachicola Bay FL 2,646 (0.24) 22,573 (2.02) 2,695 (29.2) 3,491 (157.6) 0.98 6.47
Mobile Bay AL 2,911 (0.31) 622 (0.07) 1,151 (31.4) 1,045 (11.2) 2.53 0.60
West Mississippi Sound AL/MS 7,533 (1.08) 566 (0.08) 3,391 (57.5) 6,490 (1.7) 2.22 0.09
Galveston Bay TX 73,997 (11.88) 2,313 (0.37) 12,950 (57.5) 10,795 (4.1) 5.71 0.21
Matagorda Bay TX 87,007 (50.47) 499 (0.29) 16,679 (57.5) 2,229 (5.2) 5.22 0.22
San Antonio Bay TX 13,875 (7.96) 444 (0.25) 2,590 (57.5) 2,158 (4.2) 5.36 0.21
Aransas Bay TX 20,768 (17.47) 381 (0.32) 3,885 (57.5) 482 (12.4) 5.35 0.79
Corpus Christi Bay TX 19,327 (13.89) 20 (0.01) 3,367 (57.5) 290 (1.4) 5.74 0.07
  1. The proportion of the estuary filtered within the residence time is given in parentheses below the volume. All estimates represent mean summer filtration (June, July, August). Also shown are historic and present areas of oyster ground (in hectares) and, in parentheses, mean oyster density (ind per square meter)