Late Holocene Chesapeake Bay Mg/Ca Data and Spring Temperature Reconstruction ----------------------------------------------------------------------- World Data Center for Paleoclimatology, Boulder and NOAA Paleoclimatology Program ----------------------------------------------------------------------- NOTE: PLEASE CITE CONTRIBUTORS WHEN USING THIS DATA!!!!! NAME OF DATA SET: Late Holocene Chesapeake Bay Mg/Ca Data and Spring Temperature Reconstruction LAST UPDATE: 2/2006 (Addition of Appendix 1: Mg/Ca Calibration data) CONTRIBUTOR: Tom Cronin, US Geological Survey IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2003-042 SUGGESTED DATA CITATION: Cronin, T., et al., 2003, Late Holocene Chesapeake Bay Mg/Ca Data and Spring Temperature Reconstruction, IGBP PAGES/World Data Center for Paleoclimatology Data Contribution Series #2003-042. NOAA/NGDC Paleoclimatology Program, Boulder CO, USA. ORIGINAL REFERENCE: Cronin, T. M., G. S. Dwyer, T. Kamiya, S. Schwede, and D. A. Willard, 2003. Medieval Warm Period, Little Ice Age and 20th Century Temperature Variability from Chesapeake Bay. Global and Planetary Change, v. 36, p. 17-29. GEOGRAPHIC REGION: Chesapeake Bay, coastal Eastern US PERIOD OF RECORD: 2200 YrBP - present DESCRIPTION: Late Holocene (2200-present) spring water temperatures from Chesapeake Bay in the eastern United States determined from magnesium/calcium (Mg/Ca) ratios in the ostracode Loxoconcha. The file provides a composite temperature curve constructed from 3 sediment core Mg/Ca records. Details on chronology, methodology, and implications for late Holocene climate variability can be found in the original reference. ABSTRACT: We present paleoclimate evidence for rapid (<100 years) shifts of ~2–4 °C in Chesapeake Bay (CB) temperature ~2100, 1600, 950, 650, 400 and 150 years before present (years BP) reconstructed from magnesium/calcium (Mg/Ca) paleothermometry. These include large temperature excursions during the Little Ice Age (~1400–1900 AD) and the Medieval Warm Period (~800–1300 AD) possibly related to changes in the strength of North Atlantic thermohaline circulation (THC). Evidence is presented for a long period of sustained regional and North Atlantic-wide warmth with low-amplitude temperature variability between ~450 and 1000 AD. In addition to centennial-scale temperature shifts, the existence of numerous temperature maxima between 2200 and 250 years BP (average ~70 years) suggests that multi-decadal processes typical of the North Atlantic Oscillation (NAO) are an inherent feature of late Holocene climate. However, late 19th and 20th century temperature extremes in Chesapeake Bay associated with NAO climate variability exceeded those of the prior 2000 years, including the interval 450–1000 AD, by 2–3 °C, suggesting anomalous recent behavior of the climate system. DATA: 1. Temperature Reconstruction Column 1: Core name Column 2: Core depth (in cm) Column 3: Estimated age (from 210Pb, pollen stratigraphy, and calibrated radiocarbon dates) Column 4: Mean Mg/Ca ratios Column 5: Estimated spring paleotemperature Column 6: 3-point running mean of paleotemperatures. Core Depth ModelYear Mg/Ca T.Est. T.Est.Smooth RD/2209 9 1995.88 23.18 12.5 RD/2209 11 1994.9 18.55 9.52 11.73 RD/2209 17 1991.95 24.23 13.18 11.51 RD/2209 19 1990.96 22.12 11.82 11.87 RD/2209 21 1989.98 20.25 10.61 11.78 RD/2209 23 1988.99 23.82 12.91 11.08 RD/2209 25 1988.01 18.88 9.73 11.1 RD/2209 27 1987.03 20.33 10.67 11.29 PTXT-2 14.5 1984.32 28.03 13.47 13.07 RD/2209 33 1984.07 27.16 15.06 14.14 PTXT-2 15 1983.85 28.78 13.88 16.69 PTXT-2 15.5 1983.38 41.82 21.12 14.11 PTMC-3 8.5 1982.72 15.17 7.34 13.58 RD/2209 37 1982.11 22.86 12.29 10.01 PTXT-2 17 1981.96 22.48 10.39 9.93 PTXT-2 17.5 1981.49 16.59 7.11 10.48 RD/2209 39 1981.12 25.4 13.93 9.63 PTXT-2 18.5 1980.55 17.91 7.85 11.75 RD/2209 41 1980.14 24.69 13.47 12.65 PTXT-2 19 1980.08 33.73 16.63 16.37 PTXT-2 19.5 1979.6 38.01 19.01 17.06 RD/2209 43 1979.15 27.91 15.54 16.22 PTMC-3 11 1978.81 25.66 14.1 15.3 PTXT-2 20.5 1978.66 33.06 16.26 14.98 RD/2209 45 1978.17 26.4 14.57 15.18 PTXT-2 21.5 1977.72 30.28 14.72 14.68 RD/2209 47 1977.19 26.67 14.75 14.77 RD/2209 49 1976.2 26.82 14.85 11.56 PTXT-2 25 1974.42 12.94 5.09 11.45 RD/2209 53 1974.23 26.13 14.4 11.72 RD/2209 55 1973.25 28.09 15.66 14.01 PTXT-2 27 1972.53 25.33 11.97 12.7 RD/2209 59 1971.28 20.03 10.47 12.4 PTMC-3 16 1971 26.68 14.75 12.55 RD/2209 61 1970.3 23.09 12.44 12.95 PTMC-3 17 1969.44 21.87 11.66 11.22 PTXT-2 31 1968.75 21 9.57 11.02 PTMC-3 17.5 1968.66 22.12 11.82 12.05 RD/2209 65 1968.33 26.69 14.76 13.05 PTMC-3 18 1967.88 23.3 12.58 11.99 PTMC-3 18.5 1967.09 17.18 8.64 11.66 PTXT-2 33 1966.87 28.55 13.76 12.08 RD/2209 69 1966.36 25.24 13.83 13.13 PTMC-3 19 1966.31 22.11 11.81 12.93 RD/2209 71 1965.38 24.18 13.14 12.35 PTXT-2 35 1964.98 25.58 12.11 12.96 PTMC-3 20 1964.75 24.95 13.64 13.15 RD/2209 73 1964.39 25.06 13.71 14.23 PTMC-3 20.5 1963.97 27.6 15.35 14.99 RD/2209 75 1963.41 28.49 15.92 14.31 PTMC-3 21 1963.19 21.86 11.65 12.07 PTXT-2 37 1963.09 19.34 8.64 11.16 RD/2209 77 1962.43 24.24 13.18 11.37 PTMC-3 22 1961.63 22.87 12.3 12.86 RD/2209 79 1961.44 24.09 13.09 11.29 PTXT-2 39 1961.21 19.04 8.48 11.26 RD/2209 81 1960.46 22.75 12.22 13.63 PTMC-3 23 1960.06 35.13 20.2 15.47 RD/2209 83 1959.47 25.47 13.98 16.67 PTXT-2 41 1959.32 32.29 15.83 13.65 PTMC-3 24 1958.5 21.05 11.13 14.87 RD/2209 85 1958.49 31.17 17.64 13.62 RD/2209 87 1957.51 22.52 12.08 16.09 PTXT-2 43 1957.43 37.19 18.55 14.99 RD/2209 89 1956.52 26.06 14.35 15.45 RD/2209 91 1955.54 24.68 13.46 14.67 PTMC-3 26 1955.38 28.9 16.19 14.28 RD/2209 93 1954.55 24.24 13.18 16.09 PTXT-2 47 1953.66 37.81 18.9 16.28 RD/2209 95 1953.57 29.8 16.76 17.01 RD/2209 97 1952.59 27.66 15.38 17.97 PTMC-3 28 1952.25 37.58 21.78 15.6 PTXT-2 49 1951.77 21.15 9.65 14.48 RD/2209 101 1950.62 22.43 12.02 11.79 PTXT-2 51 1949.89 28.45 13.7 13.39 RD/2209 103 1949.63 26.22 14.46 12.85 PTXT-2 53 1948 22.5 10.4 11.92 RD/2209 107 1947.67 20.7 10.9 11.05 RD/2209 109 1946.68 22.19 11.86 12.63 PTXT-2 55 1946.11 31 15.12 13.33 RD/2209 111 1945.7 23.95 13 13.95 RD/2209 112 1945.21 25.09 13.73 15.3 RD/2209 113 1944.71 33.53 19.17 17.34 PTMC-3 34 1942.88 33.45 19.11 17.4 RD/2209 117 1942.75 25.37 13.91 14.17 RD/2209 121 1940.78 18.5 9.48 13.2 RD/2209 123 1939.79 28.93 16.2 16.26 PTMC-3 36 1939.75 39.64 23.1 16.68 RD/2209 125 1938.81 20.47 10.75 14.4 PTXT-2 63 1938.57 20.59 9.34 11.43 RD/2209 127 1937.83 25.84 14.21 12.17 RD/2209 129 1936.84 23.91 12.97 16.3 PTXT-2 65 1936.68 42.87 21.71 14.89 RD/2209 131 1935.86 19.29 9.99 15.1 RD/2209 133 1934.87 24.9 13.61 12.52 RD/2209 135 1933.89 25.44 13.95 12.45 RD/2209 137 1932.91 18.97 9.79 11.92 RD/2209 139 1931.92 22.43 12.02 11.13 RD/2209 141 1930.94 21.74 11.57 11.37 RD/2209 145 1928.97 20.09 10.51 13.2 PTXT-2 77 1925.36 35.35 17.53 14.19 PTXT-2 79 1923.47 29.96 14.54 15.75 RD/2209 159 1922.08 27.35 15.18 15.39 PTXT-2 81 1921.58 33.38 16.44 14.28 RD/2209 161 1921.1 21.22 11.23 14.85 PTMC-3 48 1921 29.99 16.88 14.4 RD/2209 163 1920.11 27.19 15.08 16.05 PTXT-2 83 1919.7 32.95 16.2 14.21 RD/2209 165 1919.13 21.41 11.36 13.05 RD/2209 167 1918.15 21.77 11.59 12.24 PTXT-2 85 1917.81 28.59 13.78 12.88 RD/2209 169 1917.16 24.38 13.27 13.66 PTXT-2 87 1915.92 28.85 13.92 13.66 RD/2209 173 1915.19 25.2 13.8 12.68 PTMC-3 52 1914.75 19.79 10.32 14.82 RD/2209 175 1914.21 35.34 20.33 14.54 PTXT-2 89 1914.04 27.12 12.96 15.34 RD/2209 177 1913.23 23.54 12.73 13.44 RD/2209 179 1912.24 26.5 14.64 13.25 PTXT-2 91 1912.15 26.08 12.38 12.54 PTXT-2 93 1910.26 22.84 10.59 10.98 PTMC-3 56 1908.5 19.27 9.98 10.88 PTXT-2 95 1908.38 25.51 12.07 11.51 PTXT-2 97 1906.49 26.27 12.49 12.11 RD/2209 191 1906.34 22.03 11.76 12.4 PTMC-3 58 1905.38 23.86 12.94 12.9 RD/2209 195 1904.37 25.49 13.99 13.93 PTXT-2 101 1902.72 30.56 14.87 12.5 PTXT-2 103 1900.83 19.31 8.63 13.92 RD/2209 203 1900.43 32.11 18.25 13.36 RD/2209 205 1899.45 24.28 13.21 14.81 PTMC-3 62 1899.13 23.9 12.96 11.55 PTXT-2 105 1898.94 19.06 8.49 12.58 RD/2209 207 1898.47 29.08 16.3 12.99 RD/2209 209 1897.48 25.77 14.17 15.57 PTXT-2 107 1897.06 33 16.23 14.01 RD/2209 211 1896.5 21.81 11.62 14.59 PTMC-3 64 1896 28.51 15.93 14.8 PTXT-2 109 1895.17 34.13 16.85 15.45 RD/2209 215 1894.53 24.82 13.56 14.36 PTXT-2 111 1893.28 26.58 12.66 15.16 PTMC-3 66 1892.88 33.68 19.26 14.9 RD/2209 219 1892.56 23.61 12.78 14.03 RD/2209 221 1891.58 19.35 10.04 11.54 PTXT-2 113 1891.4 25 11.79 11.88 PTMC-3 68 1889.75 25.21 13.81 12.26 RD/2209 225 1889.61 21.14 11.19 12.42 PTXT-2 115 1889.51 25.87 12.27 10.73 RD/2209 227 1888.63 17.3 8.72 11.19 RD/2209 229 1887.64 23.31 12.58 11.63 RD/2209 231 1886.66 24.88 13.6 13.91 PTMC-3 70 1886.63 27.9 15.54 14.37 RD/2209 233 1885.67 25.47 13.98 15.35 RD/2209 235 1884.69 29.43 16.52 14.22 RD/2209 237 1883.71 22.67 12.17 12.82 PTMC-3 72 1883.5 18.93 9.76 11.27 PTXT-2 117 1881.44 25.15 11.87 13.02 PTMC-3 74 1880.38 30.84 17.43 12.49 PTXT-2 119 1877.58 18.47 8.16 16.41 PTMC-3 76 1877.25 40.48 23.64 15.95 PTXT-2 121 1873.73 32.69 16.06 19.27 PTMC-3 80 1871 31.91 18.12 15.28 PTMC-3 82 1867.88 21.86 11.65 15.39 PTXT-2 125 1866.02 33.32 16.41 12.93 PTMC-3 84 1864.75 20.41 10.72 16.07 PTXT-2 127 1862.16 41.76 21.09 15.15 PTMC-3 86 1861.63 24.95 13.64 16.33 RD/2209 247 1859.29 25.91 14.26 15.03 PTMC-3 88 1858.5 30.44 17.18 16.55 PTMC-3 90 1855.38 32.07 18.22 16.73 PTXT-2 131 1854.45 30.42 14.79 15.52 PTXT-2 133 1850.59 28.16 13.54 12.3 PTXT-2 135 1846.74 19.23 8.58 11.24 PTXT-2 137 1842.88 24.67 11.6 12.57 PTMC-3 98 1842.88 30.98 17.52 13.73 PTMC-3 102 1836.63 22.53 12.08 12.76 PTXT-2 143 1831.31 19.43 8.69 11.9 PTMC-3 106 1830.38 26.97 14.94 12.4 RD/2209 259 1828.7 24.86 13.58 12.15 PTXT-2 145 1827.46 18.07 7.94 10.78 PTXT-2 147 1823.6 23.28 10.83 11.19 PTMC-3 112 1821 26.73 14.79 12.23 PTXT-2 149 1819.74 23.74 11.08 12.64 RD/2209 263 1818.51 22.46 12.04 12.22 PTMC-3 114 1817.88 24.81 13.55 15.72 PTXT-2 151 1815.89 42.62 21.57 16.71 PTMC-3 116 1814.75 27.08 15.01 17.01 RD/2209 265 1813.41 26.22 14.46 12.82 PTXT-2 153 1812.03 19.98 9 14.49 PTMC-3 118 1811.63 34.83 20 13.65 RD/2209 267 1808.31 22.33 11.95 15.18 PTXT-2 155 1808.18 28.27 13.6 14.14 PTMC-3 122 1805.38 29.98 16.88 15.3 PTXT-2 157 1804.32 31.56 15.43 14.77 RD/2209 269 1803.21 22.42 12.01 12.24 PTMC-3 124 1802.25 18.17 9.27 10.33 PTXT-2 159 1800.46 21.24 9.7 12.06 PTMC-3 126 1799.13 30.49 17.2 13.16 RD/2209 271 1798.11 23.3 12.58 14 PTXT-2 161 1796.61 25.78 12.22 13 RD/2209 273 1793.02 25.83 14.2 12.76 PTMC-3 130 1792.88 22.19 11.87 11.15 PTXT-2 163 1792.75 17.06 7.38 11.94 PTMC-3 132 1789.75 29.5 16.57 12.38 RD/2209 275 1787.92 24.24 13.18 14.43 PTMC-3 134 1786.63 24.79 13.54 12.59 PTMC-3 136 1783.5 20.91 11.04 11.77 RD/2209 277 1782.82 20.44 10.74 11.54 PTXT-2 169 1781.18 26.9 12.84 12.14 PTMC-3 138 1780.38 23.69 12.83 13.44 RD/2209 279 1777.72 26.51 14.65 12.92 PTXT-2 171 1777.33 24.06 11.27 11.27 PTMC-3 142 1774.13 16.04 7.9 9.2 RD/2209 281 1772.62 16.86 8.43 12.23 PTMC-3 144 1771 35.39 20.36 13.92 RD/2209 283 1767.53 23.91 12.97 15.61 PTXT-2 177 1765.76 28.07 13.49 12.03 RD/2209 285 1762.43 18.73 9.63 11.36 PTXT-2 181 1758.05 23.52 10.96 10.17 RD/2209 287 1757.33 19.18 9.92 12.64 PTXT-2 183 1754.19 34.47 17.04 10.86 PTXT-2 185 1750.34 13.91 5.63 11.28 RD/2209 291 1747.13 21.13 11.18 9.63 PTXT-2 187 1746.48 25.51 12.07 11.37 RD/2209 293 1742.04 20.61 10.85 10.46 RD/2209 295 1736.94 16.91 8.46 9.11 PTXT-2 193 1734.91 18.22 8.02 9.08 RD/2209 297 1731.84 20.5 10.77 9.82 PTXT-2 195 1731.06 22.99 10.67 11 PTXT-2 197 1727.2 24.62 11.57 12.39 PTXT-2 199 1723.34 30.66 14.93 12.92 RD/2209 301 1721.64 22.82 12.27 13.99 RD/2209 303 1716.55 26.7 14.77 10.7 PTXT-2 203 1715.63 12.89 5.06 10.99 RD/2209 305 1711.45 24.16 13.13 9.49 RD/2209 307 1706.35 19.75 10.29 12.32 PTXT-2 209 1704.06 28.14 13.53 11.83 RD/2209 309 1701.25 21.88 11.66 12.23 PTXT-2 211 1700.21 24.51 11.51 12.1 RD/2209 310 1698.7 24.16 13.13 10.98 PTXT-2 213 1696.35 18.71 8.29 12.06 PTXT-2 215 1692.5 30.38 14.77 9.94 PTXT-2 221 1680.93 15.94 6.76 11.17 PTXT-2 225 1673.22 25.36 11.99 11.07 PTXT-2 237 1650.08 29.81 14.46 12.4 PTXT-2 239 1646.22 23.11 10.74 11.39 PTXT-2 241 1642.37 19.92 8.97 12.1 PTXT-2 243 1638.51 33.67 16.6 11.77 PTXT-2 251 1623.09 21.3 9.73 13.77 PTXT-2 257 1611.52 30.76 14.98 13.04 PTXT-2 259 1607.66 29.7 14.4 12.74 PTXT-2 261 1603.81 19.71 8.85 10.95 PTXT-2 263 1599.95 21.04 9.59 9.84 PTXT-2 265 1596.1 23.72 11.08 9.71 PTXT-2 267 1592.24 19.01 8.46 9.47 PTXT-2 269 1588.38 19.74 8.87 9.52 PTXT-2 277 1572.96 24 11.23 11.18 PTXT-2 279 1569.1 27.96 13.43 11.9 PTXT-2 297 1534.4 23.64 11.03 12.4 PTXT-2 299 1530.54 26.71 12.74 10.56 PTXT-2 301 1526.69 18.04 7.92 8.34 PTXT-2 303 1522.83 11.6 4.35 7.42 PTXT-2 305 1518.98 21.76 9.99 8.01 PTXT-2 309 1511.26 21.24 9.7 8.5 PTXT-2 311 1507.41 14.25 5.82 10.7 PTXT-2 313 1503.55 33.63 16.58 11.59 PTXT-2 315 1499.7 26.07 12.38 12.9 PTXT-2 317 1495.84 21.32 9.74 9.63 PTXT-2 319 1491.98 15.95 6.76 8.11 PTXT-2 325 1480.42 17.9 7.84 9.06 PTXT-2 327 1476.56 26.45 12.59 10.24 PTXT-2 329 1472.7 22.3 10.29 10.34 PTXT-2 331 1468.85 18.44 8.14 8.44 PTXT-2 333 1464.99 16.16 6.88 8.36 PTXT-2 339 1453.42 21.87 10.05 8.66 PTXT-2 343 1445.71 20.07 9.05 11.48 PTXT-2 349 1434.14 31.42 15.35 12.09 PTXT-2 351 1430.29 25.17 11.88 13.98 PTXT-2 353 1426.43 30.29 14.72 12.36 PTXT-2 355 1422.58 22.63 10.47 11.88 PTXT-2 357 1418.72 22.57 10.44 11.39 PTXT-2 359 1414.86 27.68 13.27 12.4 PTXT-2 372 1389.8 28.07 13.49 13.04 PTXT-2 375 1384.02 26.06 12.37 12.55 PTXT-2 377 1380.16 25.02 11.8 12.13 PTXT-2 379 1376.3 25.76 12.21 12.24 PTXT-2 387 1360.88 26.66 12.71 10.47 PTXT-2 389 1357.02 15.47 6.5 8.45 PTXT-2 391 1353.17 14.83 6.14 8.05 RD/2209 428 1341.69 21.64 11.51 10.32 PTXT-2 397 1341.6 27.73 13.3 12.32 RD/2209 430 1333.49 22.66 12.16 11.94 PTMC-3 218 1330.16 19.88 10.37 10.63 RD/2209 432 1325.29 18.32 9.37 10.75 PTMC-3 220 1323.24 23.19 12.51 11.29 RD/2209 434 1317.08 22.39 11.99 12.45 PTMC-3 222 1316.12 23.74 12.86 12.63 RD/2209 436 1308.88 24.02 13.04 13.09 PTMC-3 224 1308.82 24.53 13.37 12.34 PTMC-3 226 1301.32 20.26 10.62 11.34 RD/2209 438 1300.68 19.33 10.02 12.32 PTMC-3 228 1293.63 29.12 16.33 11.45 RD/2209 442 1284.28 16.18 7.99 11.85 RD/2209 444 1276.07 21.19 11.22 10.66 RD/2209 446 1267.87 23.59 12.77 13.31 PTMC-3 236 1260.95 28.51 15.93 14.06 RD/2209 448 1259.67 24.7 13.48 14.17 RD/2209 450 1251.47 24.09 13.09 13.89 RD/2209 452 1243.27 27.23 15.11 13.21 RD/2209 454 1235.06 21.53 11.44 13.21 RD/2209 458 1218.66 24.08 13.08 12.62 RD/2209 460 1210.46 24.49 13.34 12.22 RD/2209 462 1202.26 19.69 10.25 10.84 RD/2209 464 1194.05 17.64 8.93 9.39 RD/2209 466 1185.85 17.73 8.99 9.54 RD/2209 468 1177.65 20.4 10.71 9.97 RD/2209 470 1169.45 19.63 10.21 10.51 RD/2209 474 1153.04 20.27 10.62 10.46 RD/2209 476 1144.84 20.14 10.54 12.22 RD/2209 478 1136.64 27.86 15.51 12.52 RD/2209 480 1128.44 21.63 11.5 13.04 RD/2209 482 1120.24 22.6 12.12 11.24 RD/2209 484 1112.03 19.44 10.09 11.11 RD/2209 486 1103.83 21.04 11.12 11.78 RD/2209 488 1095.63 25.7 14.12 12.28 RD/2209 490 1087.43 21.77 11.59 12.34 RD/2209 492 1079.23 21.33 11.31 10.85 RD/2209 494 1071.02 18.77 9.66 11.02 RD/2209 496 1062.82 22.56 12.1 10.97 RD/2209 498 1054.62 21.11 11.16 10.83 RD/2209 500 1046.42 18.11 9.23 10.71 RD/2209 502 1038.22 22 11.74 11.8 RD/2209 504 1030.01 26.18 14.43 13.08 RD/2209 506 1021.81 24.05 13.06 13.18 RD/2209 508 1013.61 22.46 12.04 13.46 RD/2209 512 997.21 27.51 15.29 13.55 RD/2209 514 989 24.45 13.32 13.41 RD/2209 516 980.8 21.79 11.61 13.63 RD/2209 518 972.6 28.54 15.95 13.64 RD/2209 520 964.4 24.53 13.37 13.95 RD/2209 522 956.2 23.2 12.52 12.77 RD/2209 524 947.99 23.08 12.43 11.79 RD/2209 526 939.79 19.95 10.42 10.78 RD/2209 532 915.19 18.52 9.5 13.29 RD/2209 536 898.78 34.76 19.96 13.45 RD/2209 538 890.58 20.69 10.89 14.77 RD/2209 542 874.18 24.69 13.47 12.45 RD/2209 544 865.97 23.93 12.99 14.44 RD/2209 546 857.77 29.95 16.86 14.97 RD/2209 548 849.57 27.17 15.07 13.92 RD/2209 550 841.37 19.03 9.82 13.63 RD/2209 552 833.17 28.6 15.99 12.91 RD/2209 560 800.36 23.86 12.93 14.56 RD/2209 562 792.16 26.67 14.75 13.56 RD/2209 566 775.75 23.97 13.01 13.14 RD/2209 568 767.55 21.87 11.65 11.23 RD/2209 570 759.35 17.81 9.04 10.78 RD/2209 572 751.15 21.86 11.65 11.72 RD/2209 574 742.94 26.23 14.46 13.52 RD/2209 576 734.74 26.2 14.44 13.79 RD/2209 578 726.54 23.11 12.46 14.58 RD/2209 580 718.34 29.9 16.83 13.63 RD/2209 582 710.14 21.79 11.6 11.77 RD/2209 584 701.93 14.45 6.88 11.68 RD/2209 586 693.73 29.46 16.55 12.66 RD/2209 588 685.53 26.38 14.56 14.8 RD/2209 590 677.33 24.39 13.28 14.66 RD/2209 592 669.13 28.85 16.15 13.5 RD/2209 594 660.92 20.98 11.08 13.34 RD/2209 596 652.72 23.61 12.78 12.19 RD/2209 598 644.52 23.5 12.71 12.09 RD/2209 600 636.32 20.53 10.79 14.01 RD/2209 602 628.12 32.53 18.52 13.43 RD/2209 604 619.91 20.83 10.98 14.67 RD/2209 606 611.71 26.28 14.5 13.14 RD/2209 608 603.51 25.41 13.94 13.27 RD/2209 610 595.31 21.41 11.36 13.25 RD/2209 612 587.11 26.21 14.45 12.92 RD/2209 614 578.9 23.89 12.96 13.24 RD/2209 616 570.7 22.89 12.32 12.65 RD/2209 618 562.5 23.45 12.67 13.28 RD/2209 620 554.3 26.83 14.85 13.67 RD/2209 622 546.1 24.71 13.49 13.18 RD/2209 624 537.89 21.15 11.19 13.32 RD/2209 626 529.69 27.5 15.28 13.34 RD/2209 628 521.49 24.81 13.55 14.18 RD/2209 630 513.29 25.05 13.7 13.99 RD/2209 632 505.09 26.61 14.71 13.24 RD/2209 634 496.88 21.32 11.3 13.79 RD/2209 636 488.68 27.64 15.37 12.89 RD/2209 638 480.48 22.42 12.01 13.32 RD/2209 640 472.28 23.29 12.57 12.63 RD/2209 642 464.08 24.46 13.32 14.18 RD/2209 644 455.87 29.64 16.66 14.48 RD/2209 646 447.67 24.65 13.45 14.82 RD/2209 648 439.47 26.07 14.36 14.62 RD/2209 650 431.27 28.71 16.06 14.67 RD/2209 652 423.07 24.87 13.59 14.14 RD/2209 654 414.86 23.6 12.77 11.84 RD/2209 656 406.66 18.01 9.17 12.24 RD/2209 672 341.05 26.71 14.77 11.44 RD/2209 682 300.04 19.91 10.39 12.29 PTMC-3 366 299.34 21.97 11.72 11.59 RD/2209 684 291.83 23.44 12.67 12.53 RD/2209 688 275.43 24.27 13.2 12.51 RD/2209 696 242.62 21.88 11.66 12.9 RD/2209 700 226.22 25.26 13.84 11.62 RD/2209 702 218.02 18.29 9.35 11.02 RD/2209 708 193.41 19.09 9.87 12.64 RD/2209 710 185.21 32.82 18.71 13.83 RD/2209 712 177.01 23.81 12.9 14.91 RD/2209 714 168.8 24.13 13.11 13.28 RD/2209 720 144.2 25.25 13.83 12.62 RD/2209 722 136 20.75 10.93 11.73 RD/2209 724 127.79 19.98 10.44 11.6 RD/2209 726 119.59 24.62 13.42 14.54 RD/2209 728 111.39 34.46 19.76 15.34 RD/2209 730 103.19 23.72 12.84 15.48 RD/2209 732 94.99 25.27 13.84 13.64 RD/2209 734 86.78 25.88 14.24 12.83 RD/2209 736 78.58 19.94 10.41 11.76 RD/2209 738 70.38 20.3 10.64 11.98 RD/2209 740 62.18 26.88 14.88 11.87 RD/2209 746 37.57 19.45 10.1 13.17 RD/2209 748 29.37 26.35 14.54 12.02 RD/2209 750 21.17 21.52 11.43 12.49 RD/2209 752 12.97 21.62 11.49 11.4 RD/2209 754 4.76 21.3 11.29 11.31 RD/2209 756 -3.44 21.09 11.15 12.35 RD/2209 758 -11.64 26.45 14.61 13.57 RD/2209 760 -19.84 26.99 14.95 13.94 RD/2209 762 -28.04 22.79 12.25 14.18 RD/2209 766 -44.45 27.57 15.33 13.8 RD/2209 768 -52.65 25.22 13.81 14.97 RD/2209 770 -60.85 28.26 15.77 13.89 RD/2209 772 -69.05 22.54 12.08 13.22 RD/2209 774 -77.26 22.09 11.8 12.89 RD/2209 776 -85.46 26.72 14.78 12.94 RD/2209 778 -93.66 22.78 12.24 13.49 RD/2209 780 -101.86 24.64 13.44 12.41 RD/2209 782 -110.06 21.73 11.56 11.09 RD/2209 784 -118.27 16.6 8.26 10.19 RD/2209 786 -126.47 20.47 10.75 9.8 RD/2209 788 -134.67 19.92 10.4 10.07 RD/2209 790 -142.87 17.83 9.05 10.82 RD/2209 792 -151.07 23.96 13 11.32 RD/2209 794 -159.28 22.26 11.91 11.39 RD/2209 796 -167.48 18.13 9.25 10.76 RD/2209 798 -175.68 21.04 11.12 10.4 RD/2209 800 -183.88 20.61 10.84 2. Mg/Ca Calibration data Appendix 1. Loxoconcha Mg/Ca-Temperature Calibration data, Chesapeake Bay *Secretion temperature is equal to measured temperature except 2/9/99 sample where ecological data shows adult shells were secreted in previous fall season. Mean June and September 1999 temperatures were used for Ches. Bay channel sites. Temperatures for Atlantic shelf samples taken from oceanographic sources **Mean Mg/Ca value was taken for all adult and A-1 (pre-adult) instars for a site/date and used in Mg/Ca-temperature regression model #Current paper considers only Mg/Ca ratios. ##"NA (gender not available); mostly females were used Location Lab# Lat. Long. date coll. salin. Sec.Temp* Mn.Mg:Ca** Pres. Species Molt Valve Gender## Mg:Ca Sr:Ca Na:Ca Virg. Shelf STA #58 3437 36 44.28 75 5.82 6/5/1996 ~35 20 0 5 Loxoconcha sp. A Right M 20.17 3.41 6.15 Virg. Shelf STA #96 3436 36 53.6 75 51.5 6/19/1997 ~35 20 0 5 Loxoconcha sp. A Left M 29.25 3.65 22.77 Virg. Shelf STA #R11 3439 36 52.02 75 54.12 6/6/1996 ~35 20 0 2 Loxoconcha sp. A Left F 21.32 3.3 11.74 Virg. Shelf STA #R12 3438 36 52.02 75 54.96 6/6/1996 ~35 20 0 4 Loxoconcha sp. A Left M 21.37 3.13 9.06 Virg. Shelf STA #R7 3440 36 50.34 75 54.48 6/6/1996 ~35 20 0 3 Loxoconcha sp. A Right M 24.36 3.29 13.2 Goodwin Is. York R. 3066 37 13 N 76 23 W 2/9/1999 21 13.45 25.1 NA L. matagordensis A Carapace NA 25.27 4.18 17.45 Goodwin Is. York R. 3067 37 13 N 76 23 W 2/9/1999 21 13.45 0 NA L. matagordensis A Carapace NA 28.66 3.98 17.95 Goodwin Is. York R. 3068 37 13 N 76 23 W 2/9/1999 21 13.45 0 NA L. matagordensis A Carapace NA 27.5 3.97 15.86 Goodwin Is. York R. 3069 37 13 N 76 23 W 2/9/1999 21 13.45 0 NA L. matagordensis A Carapace NA 27.81 3.96 14.19 Goodwin Is. York R. 3070 37 13 N 76 23 W 2/9/1999 21 13.45 0 NA L. matagordensis A Carapace NA 18.77 3.95 13.21 Goodwin Is. York R. 3071 37 13 N 76 23 W 2/9/1999 21 13.45 0 NA L. matagordensis A Carapace NA 21.46 3.64 14.45 Goodwin Is. York R. 3072 37 13 N 76 23 W 2/9/1999 21 13.45 0 NA L. matagordensis A Carapace NA 29.13 4.12 15.64 Goodwin Is. York R. 3073 37 13 N 76 23 W 2/9/1999 21 13.45 0 NA L. matagordensis A Carapace NA 22.18 3.8 23.08 Guinea Marsh, York R. 3074 37 16 N 76 23 W 2/9/1999 21 13.45 25.7 NA L. matagordensis A Carapace NA 32.38 3.91 14.39 Guinea Marsh, York R. 3075 37 16 N 76 23 W 2/9/1999 21 13.45 0 NA L. matagordensis A Carapace NA 25.16 4.03 14.99 Guinea Marsh, York R. 3076 37 16 N 76 23 W 2/9/1999 21 13.45 0 NA L. matagordensis A Carapace NA 20.82 3.67 13.27 Guinea Marsh, York R. 3077 37 16 N 76 23 W 2/9/1999 21 13.45 0 NA L. matagordensis A Carapace NA 27.24 3.94 16.38 Guinea Marsh, York R. 3078 37 16 N 76 23 W 2/9/1999 21 13.45 0 NA L. matagordensis A Carapace NA 26.84 3.96 14.69 Guinea Marsh, York R. 3079 37 16 N 76 23 W 2/9/1999 21 13.45 0 NA L. matagordensis A Carapace NA 21.73 3.93 15.72 Dameron Marsh, Ches. Bay 3082 38¡47.50'N 76 17.50'W Mar-99 16.1 12 23.41 NA L. matagordensis A Carapace NA 23.26 4.33 15.08 Dameron Marsh, Ches. Bay 3083 38¡47.50'N 76 17.50'W Mar-99 16.1 12 0 NA L. matagordensis A Carapace NA 23.55 4.01 14.73 Guinea Marsh, York R. 3023 37 16 N 76 23 W 4/27/1999 19 15 24.3 NA L. matagordensis A Carapace NA 23.54 3.67 15.89 Guinea Marsh, York R. 3024 37 16 N 76 23 W 4/27/1999 19 15 0 NA L. matagordensis A Carapace NA 23.04 3.93 14.23 Guinea Marsh, York R. 3025 37 16 N 76 23 W 4/27/1999 19 15 0 NA L. matagordensis A Carapace NA 21.94 3.89 14.32 Guinea Marsh, York R. 3026 37 16 N 76 23 W 4/27/1999 19 15 0 NA L. matagordensis A Carapace NA 29.3 3.9 15.48 Guinea Marsh, York R. 3027 37 16 N 76 23 W 4/27/1999 19 15 0 NA L. matagordensis A Carapace NA 20.18 3.53 14.04 Guinea Marsh, York R. 3028 37 16 N 76 23 W 4/27/1999 19 15 0 NA L. matagordensis A Carapace NA 23.48 3.91 13.23 Guinea Marsh, York R. 3029 37 16 N 76 23 W 4/27/1999 19 15 0 NA L. matagordensis A Carapace NA 21.92 3.93 16.5 Guinea Marsh, York R. 3030 37 16 N 76 23 W 4/27/1999 19 15 0 NA L. matagordensis A Carapace NA 25.01 3.81 13.2 Guinea Marsh, York R. 3031 37 16 N 76 23 W 4/27/1999 19 15 0 NA L. matagordensis A Carapace NA 24.96 3.58 15.39 Guinea Marsh, York R. 3032 37 16 N 76 23 W 4/27/1999 19 15 0 NA L. matagordensis A Carapace NA 28.07 4.1 14.95 Guinea Marsh, York R. 3033 37 16 N 76 23 W 4/27/1999 19 15 0 NA L. matagordensis A Carapace NA 25.86 3.87 14.15 Guinea Marsh, York R. 3034 37 16 N 76 23 W 4/27/1999 19 15 0 NA L. matagordensis A Carapace NA 27.9 3.37 15.06 Guinea Marsh, York R. 3035 37 16 N 76 23 W 4/27/1999 19 15 0 NA L. matagordensis A Carapace NA 20.27 3.56 13.16 Guinea Marsh, York R. 3036 37 16 N 76 23 W 4/27/1999 19 15 0 NA L. matagordensis A Carapace NA 24.71 3.77 14.88 Guinea Marsh, York R. 3223 37 16 N 76 23 W 5/12/1999 17.1 20 40.9 2 L. matagordensis A Carapace M 36.53 4.03 22.57 Guinea Marsh, York R. 3224 37 16 N 76 23 W 5/12/1999 17.1 20 0 2 L. matagordensis A Carapace M 41.25 4.37 19.07 Guinea Marsh, York R. 3225 37 16 N 76 23 W 5/12/1999 17.1 20 0 2 L. matagordensis A Right F 38.38 4.47 15.74 Guinea Marsh, York R. 3255 37 16 N 76 23 W 5/12/1999 17.1 20 0 NA L. matagordensis A-1 Carapace M 41.47 4.29 18.76 Goodwin Is. York R. 3227 37 13 N 76 23 W 6/3/1999 20 20 0 2 L. matagordensis A Right F 32.67 3.85 19 Goodwin Is. York R. 3228 37 13 N 76 23 W 6/3/1999 20 20 0 2 L. matagordensis A Carapace F 32.09 4.2 17.91 Guinea Marsh, York R. 3226 37 16 N 76 23 W 6/3/1999 17.8 20 27.46 2 L. matagordensis A Carapace F 36.15 4.15 19.34 Ches. Bay #8.1 3211 36 59.13 76 10.12 6/7/1999 30.5 16.9 27.35 2 Loxoconcha sp. A Right M 17.77 2.93 11.55 Ches. Bay #8.1 3243 36 59.13 76 10.12 6/7/1999 30.5 16.9 0 2 Loxoconcha sp. A-1 Right M 28.44 3.63 21.52 Ches. Bay CB5.4 3220 37 47.97 76 10.55 6/7/1999 21.7 19.75 28.71 1 Loxoconcha sp. A Left M 22.6 3.38 11.54 Ches. Bay CB5.4 3222 37 47.97 76 10.55 6/7/1999 21.7 19.75 0 2 Loxoconcha sp. A Left NA 15.4 2.81 11.68 Ches. Bay CB5.4 3253 37 47.97 76 10.55 6/7/1999 18.5 19.75 0 2 Loxoconcha sp. A-1 Left M 17.85 3.08 18.15 Ches. Bay CB6.1 3217 37 35.31 76 09.71 6/7/1999 22.3 20.5 0 2 Loxoconcha sp. A Right F 33.56 3.59 15.14 Ches. Bay CB6.1 3218 37 35.31 76 09.71 6/7/1999 22.3 20.5 0 1 Loxoconcha sp. A Left M 28.25 3.57 12.94 Ches. Bay CB6.1 3219 37 35.31 76 09.71 6/7/1999 22.3 20.5 0 1 Loxoconcha sp. A Left M 35.38 3.44 13.25 Ches. Bay CB6.1 3251 37 35.31 76 09.71 6/7/1999 22.3 20.5 0 2 Loxoconcha sp. A-1 Right M 25.28 3.4 13.89 Ches. Bay CB6.1 3252 37 35.31 76 09.71 6/7/1999 22.3 20.5 0 2 Loxoconcha sp. A-1 Right M 31.06 3.35 53.43 Ches. Bay CB6.4 3213 37 14.19 76 12.22 6/7/1999 27.4 19.2 0 1 Loxoconcha sp. A Carapace M 21.21 3.28 11.99 Ches. Bay CB6.4 3214 37 14.19 76 12.22 6/7/1999 27.4 19.2 0 2 Loxoconcha sp. A Right M 29.02 3.65 13.34 Ches. Bay CB6.4 3215 37 14.19 76 12.22 6/7/1999 27.4 19.2 0 2 Loxoconcha sp. A Left M 27.73 3.71 13.69 Ches. Bay CB6.4 3245 37 14.19 76 12.22 6/7/1999 27.4 19.2 0 1 Loxoconcha sp. A-1 Right M 30.29 3.64 42.55 Ches. Bay CB6.4 3246 37 14.19 76 12.22 6/7/1999 27.4 19.2 0 2 Loxoconcha sp. A-1 Left F 29.42 3.38 28.36 Ches. Bay CB7.3E 321 37 13.48 76 03.27 6/7/1999 28.9 19.8 0 2 Loxoconcha sp. A Right M 24.05 3.44 14.84 Ches. Bay CB7.3E 322 37 13.48 76 03.27 6/7/1999 28.9 19.8 0 2 Loxoconcha sp. A Carapace M 38.8 3.9 21.11 Ches. Bay CB7.3E 323 37 13.48 76 03.27 6/7/1999 28.9 19.8 0 2 Loxoconcha sp. A Carapace F 27.28 3.48 13.26 Ches. Bay CB7.3E 324 37 13.48 76 03.27 6/7/1999 28.9 19.8 0 2 Loxoconcha sp. A Carapace M 35.79 3.5 15.23 Ches. Bay CB7.3E 326 37 13.48 76 03.27 6/7/1999 28.9 19.8 0 1 Loxoconcha sp. A Carapace M 26.63 3.46 17.84 Ches. Bay CB7.3E 327 37 13.48 76 03.27 6/7/1999 28.9 19.8 0 3 Loxoconcha sp. A Carapace M 22.29 3.51 18.24 Ches. Bay CB7.3E 329 37 13.48 76 03.27 6/7/1999 28.9 19.8 0 1 Loxoconcha sp. A Left M 23.63 3.11 11.19 Ches. Bay CB7.3E 3241 37 13.48 76 03.27 6/7/1999 28.9 19.8 0 2 Loxoconcha sp. A-1 Right M 22.61 3.34 13.42 Ches. Bay CB5.4 3433 37 47.97 76 10.55 6/8/1999 21.7 18.5 0 1 Loxoconcha sp. A Left F 44.78 4.15 14.6 Ches. Bay CB6.1 3450 37 35.31 76 09.71 6/8/1999 22.3 20.5 0 2 Loxoconcha sp. A Left M 37.4 3.27 7.84 Ches. Bay CB6.4 3452 37 14.19 76 12.22 6/8/1999 27.4 19.2 0 2 Loxoconcha sp. A Right M 24.59 3.37 13.42 Ches. Bay CB7.3E 3445 37 13.48 76 03.27 6/8/1999 28.9 19.8 0 1 Loxoconcha sp. A Right M 40.12 3.52 13.33 Ches. Bay CB7.3E 3446 37 13.48 76 03.27 6/8/1999 28.9 19.8 0 2 Loxoconcha sp. A Left M 24.79 3.51 9.29 Ches. Bay CB7.3E 3447 37 13.48 76 03.27 6/8/1999 28.9 19.8 0 1 Loxoconcha sp. A Right F 37.58 3.45 9.43 Ches. Bay CB7.3E 3448 37 13.48 76 03.27 6/8/1999 28.9 19.8 0 2 Loxoconcha sp. A Left M 26.36 3.44 9.74 Ches. Bay LE4.3B 3216 37 13.76 76 28.38 6/8/1999 25.3 19.8 38.05 2 Loxoconcha sp. A Right M 29.8 3.09 14.16 Ches. Bay LE4.3B 3247 37 13.76 76 28.38 6/8/1999 25.3 19.8 0 2 Loxoconcha sp. A-1 Left M 21.71 3.38 115.89 Ches. Bay LE4.3B 3248 37 13.76 76 28.38 6/8/1999 25.3 19.8 0 2 Loxoconcha sp. A-1 Right M 18.61 3.41 19.41 Ches. Bay LE4.3 3249 37.14.45 76 29.10 6/9/1999 18.8 20.3 0 2 Loxoconcha sp. A-1 Right M 24.88 3.81 16.97 Ches. Bay LE4.3 3250 37.14.45 76 29.10 6/9/1999 18.8 20.3 0 2 Loxoconcha sp. A-1 Right M 20.77 2.96 18.72 Goodwin Is. York R. 3230 37 13 N 76 23 W 6/22/1999 20.2 22 0 1 L. matagordensis A Carapace F 34.09 4.33 21.12 Goodwin Is. York R. 3231 37 13 N 76 23 W 6/22/1999 20.2 22 0 2 L. matagordensis A Left F 36.93 4.15 17.77 Goodwin Is. York R. 3258 37 13 N 76 23 W 6/22/1999 20.2 22 0 NA L. matagordensis A-1 Carapace F 35.35 4.3 32.46 Guinea Marsh, York R. 3229 37 16 N 76 23 W 6/22/1999 19.5 22 38.09 1 L. matagordensis A Right M 37.87 4.14 18.78 Guinea Marsh, York R. 3257 37 16 N 76 23 W 6/22/1999 19.5 22 0 1 L. matagordensis A-1 Left M 31.91 4.19 19.34 Guinea Marsh, York R. 3232 37 16 N 76 23 W 7/6/1999 21.5 29.2 43.45 1 L. matagordensis A Right F 47.5 4.07 17.99 Guinea Marsh, York R. 3233 37 16 N 76 23 W 7/6/1999 21.5 29.2 0 1 L. matagordensis A Left F 50.76 3.85 19.43 Guinea Marsh, York R. 3260 37 16 N 76 23 W 7/6/1999 21.5 29.2 0 1 L. matagordensis A-1 Carapace M 52.47 4.37 20.24 Goodwin Is. York R. 3435 37 13 N 76 23 W 7/20/1999 21.5 27 0 NA L. matagordensis A Left f 38.62 4.58 20.11 Guinea Marsh, York R. 3235 37 16 N 76 23 W 7/20/1999 19.9 27 43.91 2 L. matagordensis A Left F 39.82 4.2 17.17 Guinea Marsh, York R. 3237 37 16 N 76 23 W 7/20/1999 19.9 27 0 2 L. matagordensis A Carapace F 39.82 4.2 17.17 Guinea Marsh, York R. 3649 37 16 N 76 23 W 7/20/1999 19.9 27 0 2 L. matagordensis A NA F 48.59 4.46 19.12 Guinea Marsh, York R. 3650 37 16 N 76 23 W 7/20/1999 19.9 27 0 2 L. matagordensis A NA F 47.42 4.18 20.01 Guinea Marsh, York R. 3651 37 16 N 76 23 W 7/20/1999 19.9 27 0 3 L. matagordensis A NA F 44.51 4.46 18.21 Guinea Marsh, York R. 3652 37 16 N 76 23 W 7/20/1999 19.9 27 0 3 L. matagordensis A NA F 58.1 4.36 19.01 Guinea Marsh, York R. 3653 37 16 N 76 23 W 7/20/1999 19.9 27 0 2 L. matagordensis A NA F 49.64 4.53 20.28 Guinea Marsh, York R. 3654 37 16 N 76 23 W 7/20/1999 19.9 27 0 2 L. matagordensis A NA F 48.85 4.35 20.2 Guinea Marsh, York R. 3261 37 16 N 76 23 W 7/20/1999 19.9 27 0 1 L. matagordensis A-1 Carapace M 43.31 4.02 19.34 Guinea Marsh, York R. 3262 37 16 N 76 23 W 7/20/1999 19.9 27 0 1 L. matagordensis A-1 Left M 39.51 4.23 24.45 Goodwin Is. York R. 3434 37 13 N 76 23 W 8/3/1999 21 26 0 NA L. matagordensis A Right m 52.15 3.21 12.65 Guinea Marsh, York R. 3238 37 16 N 76 23 W 8/3/1999 19.9 25.5 45.7 1 L. matagordensis A Right F 46 4.23 26.39 Guinea Marsh, York R. 3655 37 16 N 76 23 W 8/3/1999 19.9 25.5 0 3 L. matagordensis A NA F 44.76 4.62 18.38 Guinea Marsh, York R. 3656 37 16 N 76 23 W 8/3/1999 19.9 25.5 0 4 L. matagordensis A NA F 44.38 4.72 18.47 Guinea Marsh, York R. 3657 37 16 N 76 23 W 8/3/1999 19.9 25.5 0 3 L. matagordensis A NA F 45.72 4.55 17.43 Guinea Marsh, York R. 3658 37 16 N 76 23 W 8/3/1999 19.9 25.5 0 3 L. matagordensis A NA F 40.93 4.5 17.79 Guinea Marsh, York R. 3659 37 16 N 76 23 W 8/3/1999 19.9 25.5 0 4 L. matagordensis A NA F 46.81 4.61 20.07 Guinea Marsh, York R. 3660 37 16 N 76 23 W 8/3/1999 19.9 25.5 0 4 L. matagordensis A NA F 50.04 4.33 17.68 Guinea Marsh, York R. 3264 37 16 N 76 23 W 8/3/1999 19.9 25.5 0 2 L. matagordensis A-1 Carapace F 47.39 4.33 19.79 Guinea Marsh, York R. 3240 37 16 N 76 23 W 8/3/1999 19.9 25.5 0 2 L. matagordensis A-1 Left F 50.97 4.49 22.6 Bogue Sound, North Carolin 3265 34¡41'N 77¡03'W 8/13/1999 35.5 30 43.63 2 L. matagordensis A Carapace F 44.1 4.14 40.67 Bogue Sound, North Carolin 3266 34¡41'N 77¡03'W 8/13/1999 35.5 30 0 2 L. matagordensis A Carapace F 40.26 4.23 18.98 Bogue Sound, North Carolin 3267 34¡41'N 77¡03'W 8/13/1999 35.5 30 0 2 L. matagordensis A Carapace F 44.01 4.36 20.38 Bogue Sound, North Carolin 3268 34¡41'N 77¡03'W 8/13/1999 35.5 30 0 2 L. matagordensis A Carapace F 45 4.21 33.84 Bogue Sound, North Carolin 3269 34¡41'N 77¡03'W 8/13/1999 35.5 30 0 2 L. matagordensis A Carapace F 38.8 4.23 20.23 Bogue Sound, North Carolin 3270 34¡41'N 77¡03'W 8/13/1999 35.5 30 0 2 L. matagordensis A Carapace F 43.18 4.14 20.68 Bogue Sound, North Carolin 3271 34¡41'N 77¡03'W 8/13/1999 35.5 30 0 2 L. matagordensis A Carapace F 46.23 4.17 21.36 Bogue Sound, North Carolin 3272 34¡41'N 77¡03'W 8/13/1999 35.5 30 0 2 L. matagordensis A Carapace M 47.44 4.2 21.65 Guinea Marsh, York R. 3443 37 16 N 76 23 W 8/17/1999 21.3 26.8 42.08 NA L. matagordensis A NA frag 44.16 3.85 16.17 Guinea Marsh, York R. 3444 37 16 N 76 23 W 8/17/1999 21.3 26.8 0 NA L. matagordensis A Left m 40 4.51 16.34 Ches. Bay 4CB.11 36102 37 35.31N 76 09.71W 9/8/1999 23 23 36.17 4 Loxoconcha sp. A NA F 34.66 3.72 11.09 Ches. Bay 4CB.14 3697 37 35.31N 76 09.71W 9/8/1999 23 23 0 3 Loxoconcha sp. A NA F 34.98 3.84 12.64 Ches. Bay 4CB.16 3698 37 35.31N 76 09.71W 9/8/1999 23 23 0 4 Loxoconcha sp. A NA M 37.74 3.78 12.55 Ches. Bay 4CB.3 36101 37 35.31N 76 09.71W 9/8/1999 23 23 0 4 Loxoconcha sp. A NA F 48.94 3.61 12.62 Ches. Bay 4CB.5 36100 37 35.31N 76 09.71W 9/8/1999 23 23 0 3 Loxoconcha sp. A NA ? 39.77 4.31 10.26 Ches. Bay 4CB.7 3696 37 35.31N 76 09.71W 9/8/1999 23 23 0 3 Loxoconcha sp. A NA M 45.39 4.27 15.83 Ches. Bay 4CB.8 3699 37 35.31N 76 09.71W 9/8/1999 23 23 0 3 Loxoconcha sp. A NA F 35.97 4.16 10.26 Ches. Bay 4CB.9 36103 37 35.31N 76 09.71W 9/8/1999 23 23 0 5 Loxoconcha sp. A NA F 39.39 3.49 11.6 Ches. Bay 5CB.1 3690 37 47.97N 76 10.55W 9/8/1999 22.7 23 0 4 Loxoconcha sp. A NA F 23.27 3.24 10.4 Ches. Bay 5CB.2 3695 37 47.97N 76 10.55W 9/8/1999 22.7 23 0 4 Loxoconcha sp. A NA F 41.04 3.27 11.05 Ches. Bay 5CB.3 3691 37 47.97N 76 10.55W 9/8/1999 22.7 23 0 4 Loxoconcha sp. A NA F 50.27 3.95 13.73 Ches. Bay 5CB.4 3692 37 47.97N 76 10.55W 9/8/1999 22.7 23 0 3 Loxoconcha sp. A NA M 24.01 3.38 10.78 Ches. Bay 5CB.5 3693 37 47.97N 76 10.55W 9/8/1999 22.7 23 0 4 Loxoconcha sp. A NA M 38.2 3.65 11.03 Ches. Bay 5CB.6 3694 37 47.97N 76 10.55W 9/8/1999 22.7 23 0 6 Loxoconcha sp. A NA M 33.76 3.38 10.38 Ches. Bay 3CB.10 3689 37 14.19N 76 12.22W 9/10/1999 23.3 23 0 5 Loxoconcha sp. A NA F 39.4 3.63 12.5 Ches. Bay 3CB.11 3688 37 14.19N 76 12.22W 9/10/1999 23.3 23 0 5 Loxoconcha sp. A NA M 29.09 3.43 13.71 Ches. Bay 3CB.2 3687 37 14.19N 76 12.22W 9/10/1999 23.3 23 0 5 Loxoconcha sp. A NA F 28.32 3.53 10.98 Ches. Bay 3CB.5 3685 37 14.19N 76 12.22W 9/10/1999 23.3 23 0 4 Loxoconcha sp. A NA F 31.43 3.86 13.5 Ches. Bay 3CB.7 3686 37 14.19N 76 12.22W 9/10/1999 23.3 23 0 5 Loxoconcha sp. A NA M 31.53 3.85 12.79 Ches. Bay 3CB.9 3684 37 14.19N 76 12.22W 9/11/1999 23.3 23 0 6 Loxoconcha sp. A NA M 36.09 4.18 12.7 Guinea Marsh, York R. 3661 37 16 N 76 23 W 9/14/1999 23 24.5 48.33 3 L. matagordensis A NA F 43.59 3.91 16.76 Guinea Marsh, York R. 3663 37 16 N 76 23 W 9/14/1999 23 24.5 0 3 L. matagordensis A NA M 45.28 4.41 18.17 Guinea Marsh, York R. 3664 37 16 N 76 23 W 9/14/1999 23 24.5 0 3 L. matagordensis A NA F 53.55 4.82 19.67 Guinea Marsh, York R. 3665 37 16 N 76 23 W 9/14/1999 23 24.5 0 3 L. matagordensis A NA F 40.03 3.85 16.16 Guinea Marsh, York R. 3666 37 16 N 76 23 W 9/14/1999 23 24.5 0 5 L. matagordensis A NA F 40.94 4.58 17.3 Guinea Marsh, York R. 3667 37 16 N 76 23 W 10/15/1999 21 16 34.43 3 L. matagordensis A NA F 31.86 4.3 16.22 Guinea Marsh, York R. 3668 37 16 N 76 23 W 10/15/1999 21 16 0 4 L. matagordensis A NA F 34.07 4.38 18.25 Guinea Marsh, York R. 3669 37 16 N 76 23 W 10/15/1999 21 16 0 3 L. matagordensis A NA F 28.71 3.77 15.34 Guinea Marsh, York R. 3670 37 16 N 76 23 W 10/15/1999 21 16 0 2 L. matagordensis A NA F 35.02 4.11 15.35 Guinea Marsh, York R. 3671 37 16 N 76 23 W 10/15/1999 21 16 0 5 L. matagordensis A NA F 42.28 4.36 16.65 Guinea Marsh, York R. 3672 37 16 N 76 23 W 10/15/1999 21 16 0 3 L. matagordensis A NA F 34.64 4.09 16.74 Guinea Marsh, York R. 3673 37 16 N 76 23 W 11/9/1999 20 13 28.93 3 L. matagordensis A NA M 32.24 4.07 16.31 Guinea Marsh, York R. 3674 37 16 N 76 23 W 11/9/1999 20 13 0 3 L. matagordensis A NA F 26.37 3.88 13.18 Guinea Marsh, York R. 3675 37 16 N 76 23 W 11/9/1999 20 13 0 5 L. matagordensis A NA F 30.45 4 16.48 Guinea Marsh, York R. 3676 37 16 N 76 23 W 11/9/1999 20 13 0 3 L. matagordensis A NA F 24.94 3.99 14.35 Guinea Marsh, York R. 3677 37 16 N 76 23 W 11/9/1999 20 13 0 2 L. matagordensis A NA M 30.8 4.15 14.92 Guinea Marsh, York R. 3678 37 16 N 76 23 W 11/9/1999 20 13 0 2 L. matagordensis A NA M 28.75 4 14.74 Guinea Marsh, York R. 3679 37 16 N 76 23 W 12/21/1999 26 9.5 24.95 5 L. matagordensis A NA F 30.75 4.17 15.32 Guinea Marsh, York R. 3680 37 16 N 76 23 W 12/21/1999 26 9.5 0 4 L. matagordensis A NA F 24.66 3.97 13.59 Guinea Marsh, York R. 3681 37 16 N 76 23 W 12/21/1999 26 9.5 0 6 L. matagordensis A NA F 24.09 4.2 14.37 Guinea Marsh, York R. 3682 37 16 N 76 23 W 12/21/1999 26 9.5 0 6 L. matagordensis A NA F 23.91 3.94 14.95 Guinea Marsh, York R. 3683 37 16 N 76 23 W 12/21/1999 26 9.5 0 6 L. matagordensis A NA F 21.35 4.14 15.62 Atlantic shelf-1007 3002 41 26.5 70 42.3 1960s 35 10 26.58 2 L. impressa A Carapace NA 27.62 3.87 15.81 Atlantic shelf-1009 3001 41 24.8 70 46.9 1960s 35 10 0 5 L. impressa A Carapace NA 25.54 4.13 14.5 Atlantic shelf-1175 3003 44 19.5 66 59.5 1960s 35 7 17.85 4 L. impressa A NA NA 17.6 2.94 8.81 Atlantic shelf-1175 3004 44 19.5 66 59.5 1960s 35 7 0 4 L. impressa A NA NA 18.1 3.04 9.43 Atlantic shelf-1319 3005 39 20 73 21 1960s 35 12 24.15 5 Loxoconcha sp. A NA NA 24.63 3.15 9.87 Atlantic shelf-1319 3006 39 20 73 21 1960s 35 12 0 4 Loxoconcha sp. A NA NA 23.67 3.09 12.03 Atlantic shelf-1340 3007 39 10 73 15 1960s 35 10 23.83 3 L. impressa A Carapace NA 21.94 3.46 11.93 Atlantic shelf-1340 3008 39 10 73 15 1960s 35 10 0 2 L. impressa A Carapace NA 25.71 3.49 16.38 Atlantic shelf-1415 3009 38 30 74 00 1960s 35 13 22.06 4 L. impressa A NA NA 26.35 3.48 13.18 Atlantic shelf-1415 3010 38 30 74 00 1960s 35 13 0 4 L. impressa A NA NA 17.77 3.55 11.09 Atlantic shelf-1423 3017 37 05 75 01 1960s 35 16 22.23 4 L. impressa A NA NA 21.65 3.42 10.73 Atlantic shelf-1423 3018 37 05 75 01 1960s 35 16 0 4 L. impressa A NA NA 22.81 3.37 12.36 Atlantic shelf-1425 3013 36 45 74 59 1960s 35 15 21.5 2 L. impressa A Carapace NA 19.88 3.23 12.78 Atlantic shelf-1425 3014 36 45 74 59 1960s 35 15 0 3 L. impressa A Carapace NA 23.1 2.89 10.49 Atlantic shelf-1425 3015 36 45 74 59 1960s 35 15 0 3 L. impressa A Carapace NA 19.93 3.2 11.38 Atlantic shelf-1425 3016 36 45 74 59 1960s 35 15 0 4 L. impressa A Carapace NA 23.09 3.26 11.97 Atlantic shelf-1431 3011 36 51 76 15 1960s 35 16 30.73 3 L. impressa A NA NA 26.61 3.34 14.96 Atlantic shelf-1431 3012 36 51 76 15 1960s 35 16 0 3 L. impressa A NA NA 34.86 3.07 12.98 Atlantic shelf-1436 3019.1 35 07 75 21 1960s 35 20 31.58 2 Loxoconcha sp. A NA NA 29.52 3.37 11.96 Atlantic shelf-1436 3019.2 35 07 75 21 1960s 35 20 0 2 Loxoconcha sp. A NA NA 36.39 3.38 15.15 Atlantic shelf-1436 3019.3 35 07 75 21 1960s 35 20 0 2 Loxoconcha sp. A NA NA 28.83 3.34 12.25 Atlantic shelf-2050 3022 37 00 75 30 1960s 35 20 36.07 3 Loxoconcha sp. A Carapace NA 36.07 3.6 12.76 Atlantic shelf-1558 3020 25 54.7 80 05.3 1960s 35 30 48.39 3 L. matagordensis A NA NA 49.77 3.9 16.51 Atlantic shelf-1558 3021 25 54.7 80 05.3 1960s 35 30 0 3 L. matagordensis A NA NA 47 4.05 18.55