. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Figure 2. Corrosion casts of the blue crab vasculature. (A) The anterior dorsal region of the thorax and a cheliped before dissection of the cast from the exoskeleton. (B) A vasculature cast removed from the exoskeleton. The heart is the large mass at the bottom center of the photograph; the sternal artery, the major vessel in the midlinc of the cast, supplies the mandibular region and periopods in blue crabs (see Fig. 3). The arteries serving the tips of one of the chelae can be seen in the upper left. ray's law, we also co
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Figure 2. Corrosion casts of the blue crab vasculature. (A) The anterior dorsal region of the thorax and a cheliped before dissection of the cast from the exoskeleton. (B) A vasculature cast removed from the exoskeleton. The heart is the large mass at the bottom center of the photograph; the sternal artery, the major vessel in the midlinc of the cast, supplies the mandibular region and periopods in blue crabs (see Fig. 3). The arteries serving the tips of one of the chelae can be seen in the upper left. ray's law, we also compared measured values for parent vessel diameters with parent vessel diameters predicted from the measured daughter vessel diameters, assuming a junction exponent of 3 (LaBarbera and Boyajian. 1991; LaBarbera, 1994). This test allowed inclusion of branch points where the junction exponent was undefined. All numerical calculations and most statistical tests were performed with StatView II (ver. ; Abacus Concepts. Berkeley, California). One sample and paired sign tests were run on StatView 4 (ver. ; Abacus Concepts); confidence intervals for medians of untransformed junc- tion exponent distributions were determined by bootstrap resampling with replacement (1000 runs) of the distri- butions using the program Resampling Stats (ver. ; Resampling Stats, Arlington, Virginia). All analyses were run on a Macintosh Ilci. Results Examples of blue crab vascular casts are given in Figure 2; a schematic diagram of a typical vascular tree is given in Figure 3. Vessel diameters were measured from 106 junctions, pooled from vascular casts of three crabs; 98 of these junctions exhibited dichotomous branching, and 8 possessed three daughter vessels. Vessel diameters ranged from 52 to 785 /urn, with parent vessel diameters spanning nearly this full range (71-785 ^m; Fig. 4). Segment lengths (the distance between branch points) could be accurately determined on only 159 segments (Fig.
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
