. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. GILL DIMENSIONS 445 50- 40 - 130 <r UJ Q. a: on - UJUJ 'dU 1 00 < 10 - uj < t-Q i 5- • WHITE • THRESHER XMAKO o BLUE o SANDBAR A DUSKY • HAMMERHEAD n 13 8 10 10 10 8 SLOPE - 0 16 LOG INTERCEPT I 83 I 0 95 0. 63 0. 67 0. 93. 10' 10 BODY WEIGHT { G ) LAMELLAE / MM VS. BODY WEIGHT FIGURE 3. Linear regression lines demonstrating the relationships between the weighted average num- ber of secondary lamellae per mm and body weight (g) in six species of elasmo
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. GILL DIMENSIONS 445 50- 40 - 130 <r UJ Q. a: on - UJUJ 'dU 1 00 < 10 - uj < t-Q i 5- • WHITE • THRESHER XMAKO o BLUE o SANDBAR A DUSKY • HAMMERHEAD n 13 8 10 10 10 8 SLOPE - 0 16 LOG INTERCEPT I 83 I 0 95 0. 63 0. 67 0. 93. 10' 10 BODY WEIGHT { G ) LAMELLAE / MM VS. BODY WEIGHT FIGURE 3. Linear regression lines demonstrating the relationships between the weighted average num- ber of secondary lamellae per mm and body weight (g) in six species of elasmobranchs. The regression line of the weighted average secondary lamellae area versus body weight (Fig. 4) for the white shark is not significantly different from the lines of one or more ectothermic species (ANCOVA P > , combined with a posteriori STP tests). At 100 kg (Table I) the estimated weighted average surface area of a secondary lamella is mm2 for a white shark, which is virtually indistinguishable from the estimated value of mm2 for a blue shark. In contrast to the great white shark, our results indicate that the mako relies upon larger secondary lamellae to increase its total gill surface area (Fig. 4). A comparison of the regression coefficients for the mako and dusky sharks [SS = ; <SScrit (5,47)] indicates that the mako possesses significantly larger secondary lamellae. Using y at 100 kg body weight (Table I) the shortfm mako has an average lamellae area of mm2, well above the estimated value for the next closest species. The shortfin mako does not exhibit unusually large filament lengths (Table I and Fig. 2), nor a greater number of secondary lamellae per mm, (Table I, and Fig. 3) according to both statistical (ANCOVAs plus STP procedures) and qualitative meth- ods of comparison. The small size range and radically different regression coefficients for the thresher shark precludes meaningful statistical comparisons. Qualitati
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
