. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 152 L. A. LEVIN W j 600- O o 500J O -i go 0> _ 400- z 300- 200- 100- 0 O o o o o. A A O 6 7 LENGTH (mm) 10 ? 700 n i LJ | 600- Q 5 500~ 40°" 300- 2OO- •k B O O O A A OA 34 36 38 40 42 44 46 48 50 52 NUMBER Of SETIGERS 54 56 56 60 62 64 FIGURE 2. Streblospio benedicti brood size as a function of: A) length and B) setiger number in the MERL eutrophication experiment, 12 May 1983. • = controls (Tanks 5 and 8); O = 8X enrichment (Tank 1); A = 32X enrichment (Tank 7). Evaluation of enrichment level effects on female trait
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 152 L. A. LEVIN W j 600- O o 500J O -i go 0> _ 400- z 300- 200- 100- 0 O o o o o. A A O 6 7 LENGTH (mm) 10 ? 700 n i LJ | 600- Q 5 500~ 40°" 300- 2OO- •k B O O O A A OA 34 36 38 40 42 44 46 48 50 52 NUMBER Of SETIGERS 54 56 56 60 62 64 FIGURE 2. Streblospio benedicti brood size as a function of: A) length and B) setiger number in the MERL eutrophication experiment, 12 May 1983. • = controls (Tanks 5 and 8); O = 8X enrichment (Tank 1); A = 32X enrichment (Tank 7). Evaluation of enrichment level effects on female traits indicate that female length (P = ) and number of setigers (P = ) were significantly greater in the 8X sludge treatment than in the 4X and OX treatments, which did not differ from one another (Table VI). Females in the 8X sludge treatment also produced more ova/ ovary (P = ), more larvae per brood pouch (P = ), and more larvae per brood (P = ) than the other two treatments, which did not differ significantly from one another (Table VI). Mean brood size in the 8X sludge treatment (x = 462) was almost twice that of the 4X sludge tank (x = 235) and over 4 times that of the control^ : 100). The only trait for which the 4X sludge treatment differed from the control wa in the total number of paired brood pouches (P - ). As in the eutrophication experiment, position of the first gametogenic segment and ovum size were not affected by sludge level. A scatter plot of brood size as a function of length (Fig. 4a) and segment number (Fig. 4b) for each sludge enrichment level reveals an exponential increase in brood size with body size. Five individuals in the 8X sludge treatment produced over 500. 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 perfectly resemble the original Marine Biological Laboratory (Woods
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
