. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 0.0 1.0 - m a a. o •O 2.0 3.0. —I— 10 —I— 20 30 —I— 40 —I— 50 —I— 60 —I— 70 SHELL HEIGHT (mm) Figure 4. Position of external lines and shell carbonate oxygen isotopic record for the shell of specimen PMIO. The external lines illustrated in the diagram are those interpreted by NMFS personnel as representing years of growth. These are numbered in reverse chronological order (line 1 is the most recently formed) to facilitate comparison with those on specimen PM26. The isotopic values of discrete sample powders are plotted with

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. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 0.0 1.0 - m a a. o •O 2.0 3.0. —I— 10 —I— 20 30 —I— 40 —I— 50 —I— 60 —I— 70 SHELL HEIGHT (mm) Figure 4. Position of external lines and shell carbonate oxygen isotopic record for the shell of specimen PMIO. The external lines illustrated in the diagram are those interpreted by NMFS personnel as representing years of growth. These are numbered in reverse chronological order (line 1 is the most recently formed) to facilitate comparison with those on specimen PM26. The isotopic values of discrete sample powders are plotted with  Stock Photo
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. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 0.0 1.0 - m a a. o •O 2.0 3.0. —I— 10 —I— 20 30 —I— 40 —I— 50 —I— 60 —I— 70 SHELL HEIGHT (mm) Figure 4. Position of external lines and shell carbonate oxygen isotopic record for the shell of specimen PMIO. The external lines illustrated in the diagram are those interpreted by NMFS personnel as representing years of growth. These are numbered in reverse chronological order (line 1 is the most recently formed) to facilitate comparison with those on specimen PM26. The isotopic values of discrete sample powders are plotted with
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. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 0.0 1.0 - m a a. o •O 2.0 3.0. —I— 10 —I— 20 30 —I— 40 —I— 50 —I— 60 —I— 70 SHELL HEIGHT (mm) Figure 4. Position of external lines and shell carbonate oxygen isotopic record for the shell of specimen PMIO. The external lines illustrated in the diagram are those interpreted by NMFS personnel as representing years of growth. These are numbered in reverse chronological order (line 1 is the most recently formed) to facilitate comparison with those on specimen PM26. The isotopic values of discrete sample powders are plotted with the 6'*0 scale reversed so that lower b values, which represent "warm" isotopic temperatures, are at the top of the vertical scale. The millimeter scale on the horizontal axis relates the position of the external lines and the position of individual carbonate powder samples to shell height. Discussion Interpretation of observed oxygen isotope records With the predictive model outlined previously, the oxygen isotope records obtained from the scallop shells may be interpreted as yearly cycles controlled by seasonal hydrographic conditions. The isotopic record from specimen PM10 is interpreted as showing two full years of growth with the beginning of a third year (Fig. 4). Specimen PMIO completed one year of growth at a shell height of 25 mm as determined by one full cycle in the isotopic record. Shell deposited from 0 to 10 mm gradually becomes isotopically lighter (more negative), representing late winter to late spring, and reaches an inferred late summer maximum temperature at approximately 15 mm shell height (Fig. 4). The seasonal trend continues into the late fall and early v/inter as represented by shell deposited from 15 to 25 mm. A second annual cycle. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfe

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