. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SEA SCALLOP GROWTH RATES 189 ^ H < CO. M —r- A M J J MONTH —r- S o p18 -16 H m - 14 S -0 m -12 D > - 10 H (_ J3 - 8 m ^^ o - 6 o ^^ - 4 - 2 Figure 2. Mean monthly bottom water salinity (solid line) and temperature (dashed line) for areas of the Virginia Bight continental shelf with water depths between 40 and 60 meters. Data obtained from NOAA-NODC and Nickerson and Mountain (1983) are summarized for the years 1975-1979. Average monthly bottom water temperatures for the same area rang
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SEA SCALLOP GROWTH RATES 189 ^ H < CO. M —r- A M J J MONTH —r- S o p18 -16 H m - 14 S -0 m -12 D > - 10 H (_ J3 - 8 m ^^ o - 6 o ^^ - 4 - 2 Figure 2. Mean monthly bottom water salinity (solid line) and temperature (dashed line) for areas of the Virginia Bight continental shelf with water depths between 40 and 60 meters. Data obtained from NOAA-NODC and Nickerson and Mountain (1983) are summarized for the years 1975-1979. Average monthly bottom water temperatures for the same area range from ap- proximately °C to a maximum of approximately °C. Extreme temperatures may be 2 or 3°C on either side of the average range, dipping to 4°C or rising to 16°C. Throughout most of the winter, spring, and early summer, average bottom water temperatures remain below °C (Fig. 2). Beginning in late summer and continuing through the fall, bottom water temperatures steadily increase to an annual maximum. An abrupt temperature drop with the onset of winter is followed by a fairly constant low temperature. As in the case of yearly salinity variations, short- term excursions in temperature also occur throughout the year, probably caused by local hydrographic events. Predicted isotopic composition of shell calcite The isotopic composition of shell calcite was predicted using: (1) an unpublished regression equation relating the water 6'^0 to salinity for the Virginia Bight (R. G. Fairbanks, pers. comm.), (2) the average bottom-water salinity and temperature ob- servations, and (3) the calcite paleotemperature equation (Epstein et al., 1953). The predicted 6'^0 of calcite can be estimated by solving the paleotemperature equation (Epstein et al., 1953) using the quadratic formula, such that: 5'«0 (calcite) = 5'^0 (water) + [( - ( - T)] where T = temperature in degrees C. Temperature observations and water ^'''O estimates from salinity obse
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