. Die biologische Bulletin. Biologie; Zoologie; Biologie; Meeresbiologie. 28 0 10 20 30 40 Mittlere Schale: Höhe (mm) Abbildung 5. Seitenverhältnis (AR = mittlere Schale Länge: Höhe (H) Verhältnis ± SE) mit zunehmender shell Höhe eines natürlichen Bevölkerung ofArgopecten irradians im Nordwesten Hafen gesammelt. Stichprobenumfang für jeden Mittelwert angegeben. Gefitteten Kurve wird durch die Gleichung AR = (a - d)/[l-(H/21.242)"""+d], wobei d = 0.944 beschrieben. 75% auf 1%. Maximale mittlere Werte von 84^ mol Min'g' wurden am 23. September, wenn jakobsmuscheln eine mittlere Größe von 29 mm erreicht hatte, und erschien dem declin

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. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 28 0 10 20 30 40 Mean Shell Height (mm) Figure 5. Aspect ratio (AR = mean shell length:height (H) ratio ± SE) with increasing shell height of a natural population ofArgopecten irradians collected in Northwest Harbor. Sample size is indicated for each mean value. Fitted curve is described by the equation AR = (a- d)/[l - (H/21.242) """ + d], where d = 0.944. 75% to 1%. Maximum mean values of 84 ^moles min ' g~' were recorded on 23 September, when scallops had reached a mean size of 29 mm, and appeared to decline thereafter. Over the scallop size range sampled in this study, there was an overall, significant, positive relationship between octopine dehydrogenase activity (A) and muscle dry weight (W in milligrams), as described by the equation: A = 9.87 (SE = 3.52) w'U5ISE=""7> (r = 0.81; n = 57), determined using SYSTAT iterative nonlinear curve fit- ting (Wilkinson, 1990). It remains to be determined whether adult scallops exhibit a decline in ODH activities. High individual variability in ODH activity on any given sampling date may be partly attributable to the large vari- ation in scallop sizes. A comparable three-fold range in the weight of the adductor muscles was obtained within any given sampling date throughout the study period. Relocation experiments. Results of the relocation ex- periment carried out in NWH using individually marked natural set are shown in Figure 8. Forty-three percent of the scallops initially released (n{ = 150. H = 8.6 mm) were recovered alive and 7% were found dead (crushed or with empty intact valves) by the end of 24 h. There was no significant difference between the mean position at time zero (collection) and 24 h following dislodgement (P = 0.063, Wilcoxon signed-rank test for paired com- parisons; Fig. 8), although final height was lower than initial height in 72% of scallops recovered on eelgrass, suggesting that 24 h may have been i

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• booksubjectzoology
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