. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. INTRASPECIFIC VARIATION IN SCALLOPS Table I Parameters (± 95% of the von Benalanffy equations describing shell height (H, mm) as a function of age (years) in Placopecten magellanicus collected from depths of10 in ami 31 m in three locations 365 Sunnyside, Newfoundland St. Andrews. New Brunswick New Jersey 1 0 m 31 m 10m 31 m 10m 31m H, ± ± ± ± ± K ± + ± ± + to r n 272 243 8
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. INTRASPECIFIC VARIATION IN SCALLOPS Table I Parameters (± 95% of the von Benalanffy equations describing shell height (H, mm) as a function of age (years) in Placopecten magellanicus collected from depths of10 in ami 31 m in three locations 365 Sunnyside, Newfoundland St. Andrews. New Brunswick New Jersey 1 0 m 31 m 10m 31 m 10m 31m H, ± ± ± ± ± K ± + ± ± + to r n 272 243 83 73 — 145 The age classes found were 1-20 years at Sunnyside. 1-12 years at St. Andrews, and 1-10 years at New Jersey, r = coefficient of determination, n = number of observations. 31 m, all regressions were significantly different, somatic weight being greatest at St. Andrews and least at Sunny- side. However, at the shallowest depths somatic weight was greater in scallops from St. Andrews and Sunnyside than in those from New Jersey. Significant differences were also observed between linear regressions of somatic weight against shell height (both variates transformed to logarithms), excepting the samples from the shallowest collections at Sunnyside and New Jersey (Tables II, III). Production There was a clear latitudinal trend in gamete produc- tion (Pr) by individual scallops from 31 m depth (New Jersey > St. Andrews > Sunnyside) which was also re- flected in total production (Pg + Pr), but the greatest so- matic production (Pg) was at St. Andrews and the least at Sunnyside (Fig. 6). Scallops from New Jersey also pro- 140., 100. o UJ I UJ x to 60. 20. •f •r AGE (yr) Figure 4. Shell growlh in scallops. Placopecten magellanicus, from Sunnyside (• 10 mi O 31 m), St. Andrews (• 10m;D31 m) and New Jersey (A). duced more gametes than those from shallow water (10 m) at the more northerly locations, and older individuals from New Jersey (>5 years) showed
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