. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 364 B. A. M\( l)()\\l D AND R. J. THOMPSON 16 .. N D Figure 2. Water temperatures. •• • •• Sunnysidc (It) m): O Sunnyside (31 m):B---«St. Andrews (10 m); D---D St. Andrews (31 m): A---A New Jeisev and Beninger( 1987). spawning in Placopecten nuigcllan- icns from the St. Andrews area occurs at the same time as it does at Sunnyside, , late August to early September. Whereas gametogenesis began earlier in the year at Sun- nyside than at New Jersey, mature (ripe) gametes did not appear in Sunnyside scallops until April, comp
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 364 B. A. M\( l)()\\l D AND R. J. THOMPSON 16 .. N D Figure 2. Water temperatures. •• • •• Sunnysidc (It) m): O Sunnyside (31 m):B---«St. Andrews (10 m); D---D St. Andrews (31 m): A---A New Jeisev and Beninger( 1987). spawning in Placopecten nuigcllan- icns from the St. Andrews area occurs at the same time as it does at Sunnyside, , late August to early September. Whereas gametogenesis began earlier in the year at Sun- nyside than at New Jersey, mature (ripe) gametes did not appear in Sunnyside scallops until April, compared with January for New Jersey scallops in which mature ga- metes were present almost year-round. There was a small decrease in GVF (MG) during June and July in scallops from New Jersey, followed by an increase in August. \\hich may suggest partial or dribble spawning (Newell ctai. 1982). Shell growth Von Bertalantfy equations were used to relate shell height to age for all age classes represented in each sam- ple ( I able I). There was a latitudinal gradient in longev- n\ iSunnyside > St. Andrews > New Jersey: see legend to Table I), although there was no clear trend for asymp- totic heiuhl (11 / ). Shell height was greatest at Sunnyside ( H) ml and least at New Jerse>. with intermediate values in scallops from St. Andrews, but in deeper water (31 m) at Sumnsule II / was relatively small. The Brod> growth coefficient (K.) was lower in the Sunnyside popu- lation (especialh at 3 I m) than in the others, indicating that scallops from Sunmsidc readied asymptotic height relatively slowl\ con i>;ircd with those from more soutli- erl\ locations, but caution must be exercised in compar- ing growth coefficients when II / values are different (see Discussion) For a rigorous comparison ol growth rates, polynomial regressions afford the advantage that they can be handled by linear models (MacDonald and Thompson, I985a). Comparisons were made between scallops fr
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