. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. EARLY EMBRYONIC SWIMMING PATTERNS 97 £ £ « n=80 n=53 0 4- 50 ft C 100 150 diameter (tmi) 200 250 Figure 2. Mean swimming rates for blastulae at 10 °C. Bars show one standard deviation about the mean, a = Strongylocentrotus purpuratus (n = 30), b = Dendraster excemricus (n = 80). c = S. franciscanus (n = 50), d = S. droebachiensis (n = 32) nol, a metabolic inhibitor (Flickinger, 1972), this tempera- ture effect was negated. A closer examination of the swimming pattern of S. fhinciscanus at the two temperat
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. EARLY EMBRYONIC SWIMMING PATTERNS 97 £ £ « n=80 n=53 0 4- 50 ft C 100 150 diameter (tmi) 200 250 Figure 2. Mean swimming rates for blastulae at 10 °C. Bars show one standard deviation about the mean, a = Strongylocentrotus purpuratus (n = 30), b = Dendraster excemricus (n = 80). c = S. franciscanus (n = 50), d = S. droebachiensis (n = 32) nol, a metabolic inhibitor (Flickinger, 1972), this tempera- ture effect was negated. A closer examination of the swimming pattern of S. fhinciscanus at the two temperatures revealed that the de- crease in swimming rate at 14 °C was proximally caused by a change in swimming pattern. The radius of the helical path followed by swimming embryos was most frequently 1 embryo diameter or less, making accurate measurement of radii difficult, but helical period could vary widely among individuals. For ease of data extraction. I measured the period length (Fig. 5 A). As temperature increased, the dis- tribution of period frequencies shifted (Kolmogorov-Smir- nov test for discrete data, significant difference at a < ) such that, on average, embryos at 14 °C were fol- lowing paths with greater period (Fig. 5B). This had the effect of increasing the distance traveled between two ver- tical points, slowing their rate of ascent. n=29 n=30 n=70 n=80 n = 31 n=50 n = 38 n=32. D. excentrlcus p< 5. franciscanus p< S. droebachiensis p< .Omean sinking speed Bmean swimming speed | Figure 3. Comparison of sinking rates with swimming rates at 10 °C. P values for two-tailed t tests shown tor each within-species 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 Hole, Mass. ); Marine Biological Laboratory (Woods Hole,
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
