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. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. • H - 7.2 mm (SE = 0.04) * H - 13.2 mm (SE = 0.07). 30 - 20 - 10 - 0 4 8 12 16 20 24 28 32 36 40 44 48 Time (hours) Figure 2. Temporal changes in the mean height above bottom at- tained by Argopecien irradians of three different size classes on eelgrass mimics in the laboratory (mean blade height = 50 cm). Data points are fitted to a rectangular hyperbolic function (Y - aX/b + X). Vertical bars represent 95% confidence intervals. 46-48 h (for 7.2- and 5.7-mm scallops, respectively), but not before (P < 0.01, Games and How

. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. • H - 7.2 mm (SE = 0.04) * H - 13.2 mm (SE = 0.07). 30 - 20 - 10 - 0 4 8 12 16 20 24 28 32 36 40 44 48 Time (hours) Figure 2. Temporal changes in the mean height above bottom at- tained by Argopecien irradians of three different size classes on eelgrass mimics in the laboratory (mean blade height = 50 cm). Data points are fitted to a rectangular hyperbolic function (Y - aX/b + X). Vertical bars represent 95% confidence intervals. 46-48 h (for 7.2- and 5.7-mm scallops, respectively), but not before (P < 0.01, Games and How Stock Photo
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Library Book Collection / Alamy Stock Photo

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RHMD1K

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7.1 MB (130.7 KB Compressed download)

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2217 x 1127 px | 37.5 x 19.1 cm | 14.8 x 7.5 inches | 150dpi

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. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. • H - 7.2 mm (SE = 0.04) * H - 13.2 mm (SE = 0.07). 30 - 20 - 10 - 0 4 8 12 16 20 24 28 32 36 40 44 48 Time (hours) Figure 2. Temporal changes in the mean height above bottom at- tained by Argopecien irradians of three different size classes on eelgrass mimics in the laboratory (mean blade height = 50 cm). Data points are fitted to a rectangular hyperbolic function (Y - aX/b + X). Vertical bars represent 95% confidence intervals. 46-48 h (for 7.2- and 5.7-mm scallops, respectively), but not before (P < 0.01, Games and Howell approximate test for equality of means with unequal variances. Table IB). A Tukey-Kramer test of multiple comparisons also indicated significant differences (P < 0.01) in the mean position of larger (13 mm) scallops after 1, 3, or 24 h (Table IB). No significant size effects (P = 0.428) were found in the mean height attained by 5.7- and 7.2-mm scallops, or in that attained by scallops of the same size class located in different aquaria (P = 0.376, Table IA). Mean elevation of small scallops (< 7.2 mm) coincided with mid-canopy height (0.57 of blade height; SD = 0.286, « = 126), whereas 22% of the scallop population was found near the top (upper 1/10) of the canopy, and none at the base of shoot mimics. In general, however, scallops were distributed throughout most of the length of eelgrass mimics at the end of 48 h (from 2.5 to 48 cm above bottom). Field studies Vertical distribution of natural set. A single cohort of first-year A. irradians occurred in both embayments throughout this study (July-October), as indicated by unimodal size-frequency distributions obtained in NWH and NAPH over time. No significant new recruitment of post-settlement scallops was observed during late summer and early fall at either study site, except for a few new recruits (< 4% of the total) observed in NAPH in early September, although spawning in these embayments is known to extend

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