. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering Bivalve mollusks 1181. Figure 66-21. Qualitative distribution of Cyclocardia crebricosta taken in the southeastern Bering Sea by van Veen grab (Federetal. 1980). GENERAL DISCUSSION The clam age studies presented in Table 66-21 compare the results of Neiman (1964) and Feder et al. (1980) in the southeastern portion of the Bering Sea with those of Stoker (1978) in the northern Bering Sea and the Chukchi Sea. Neiman (1964) and Feder et al. (1980) report similar size
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering Bivalve mollusks 1181. Figure 66-21. Qualitative distribution of Cyclocardia crebricosta taken in the southeastern Bering Sea by van Veen grab (Federetal. 1980). GENERAL DISCUSSION The clam age studies presented in Table 66-21 compare the results of Neiman (1964) and Feder et al. (1980) in the southeastern portion of the Bering Sea with those of Stoker (1978) in the northern Bering Sea and the Chukchi Sea. Neiman (1964) and Feder et al. (1980) report similar sizes at age for Nucula tenuis, Nuculana fossa, and Macoma calcarea for agesO through 3 (Table 66-21). Data from Neiman (1964) for older clams indicate differences of mm in shell lengths greater than the sizes at age reported by Feder et al. (1980; Table 66-21). Accurate determinations of true annuli in older clams are difficult, and the disparities in the two studies are probably due to differences in aging technique rather than actual differences in growth rates. Shell lengths of M. calcarea at a given age in the Chukchi Sea are 2-3 mm shorter (Stoker 1978) than those reported for the southeastern Bering Sea in Table 66-21. Growth history data (Figs. 66-27, 66-28, and 66-30) and previous work by Feder et al. (1980), Neiman (1964), and Stoker (1978) suggest that growth rates of these species have not exhibited marked fluctua- tions from 1961 to 1976 (Table 66-21). Growth history data for individual stations in the Bering Sea are reported in Feder et al. (1980). Since the 0-age Spisula polynyma were collected in May, they were assumed to have overwintered rather than to be newly settled clams. Hughes and Bourne reported (Chapter 67, this volume) that S. polynyma spawn from late June through early August. The shell lengths of age 0 ranged from to mm (Fig. 66-38). There is poor agreement for size at age of 5. polynyma from ages 0 to 9 between this report and that of H
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