. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. EFFECTS OF LARVAL SWIMMING DURATION 229 s o 100-, 80- 60- 40- 20- % Initiated % Completed. 12 16 20 24 28 Larval Swimming Duration (h) Figure 4. Percent initiation and completion of metamorphosis versus larval swimming duration in Bugiila neritina. Larvae kept swimming for 16 h were less likely to both initiate and complete metamor- phosis. The lines are staggered slightly for clanty (bars = 1 standard error; n = 5). each of these calculated parameters (Table I), and sig- nificant declines occurred after 8 h of larval swimmi
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. EFFECTS OF LARVAL SWIMMING DURATION 229 s o 100-, 80- 60- 40- 20- % Initiated % Completed. 12 16 20 24 28 Larval Swimming Duration (h) Figure 4. Percent initiation and completion of metamorphosis versus larval swimming duration in Bugiila neritina. Larvae kept swimming for 16 h were less likely to both initiate and complete metamor- phosis. The lines are staggered slightly for clanty (bars = 1 standard error; n = 5). each of these calculated parameters (Table I), and sig- nificant declines occurred after 8 h of larval swimming. By 28 h of larval swimming the percent decrease in mean lophophore height, surface area, and volume was 25%, 40%, and 55%, respectively, compared to individuals that developed from larvae induced to metamorphose shortly after the onset of larval swimming. Maximum number of tentacles (21: range 19-21) occurred in indi- viduals that developed from larvae induced to metamor- phose shortly after the onset of larval swimming (Table II). Minimum number of tentacles (16: range 16-20) oc- curred in ancestrulae that developed from larvae kept swimming for 24 h prior to the onset of metamorphosis (Table II). Significant declines were observed for all parameters in the second experiment also. After 40 h of larval swim- Table II Tentacle length, top and base diameter of the lophophore, and ranges ol tentacle number as a function of larval swimming duration (mean ± standard error of the mean): measurements were made on ancestrulae less than 24 h post metamorphosis Swimming Duration (h) N Tentacle Length (^m) Top Diameter ( /jm ) Base Diameter (/im) Tentacle # (Range:Mode) 0 28 520 ± 10 556+ 10 152 ±3 19-21:20 4 31 493 ± 1 1 535+11 I53±2 17-21:19 8 28 467 + 1 3 513± 11 145 ±3 18-21:19 12 32 469 ± 12 518± 9 142 ±2 17-21:20 16 23 442 ± 12 499 ± 1 3 145 ±3 17-21:19 20 23 412± 16 474 ± 20 139 + 4 17-21:19 24 15 400 ± 16 424 ± 15 142 ±3 16-20:18, 19 28 8 390 ± 27 423 ±21 1
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
