. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Figure 5. "C distribution within fused labeled and unlabeled fragments on two laboratory colonies of Parenthropodium fidvum fulrum: (a) Colony 5 (Table I) 24 h after fusion, (b) Colony 6 (Table I) 48 h after fusion. Circles represent cork-bored samples ( cnr). Numbers are the disintegrations per minute per sample. Scale bar = 5 mm. (Chapman. 1974; Fautin and Mariscal. 1991). but also as an effective circulatory apparatus, analogous to a primi- tive vascular system. The transport of metabolites within P. f. fulvitm
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Figure 5. "C distribution within fused labeled and unlabeled fragments on two laboratory colonies of Parenthropodium fidvum fulrum: (a) Colony 5 (Table I) 24 h after fusion, (b) Colony 6 (Table I) 48 h after fusion. Circles represent cork-bored samples ( cnr). Numbers are the disintegrations per minute per sample. Scale bar = 5 mm. (Chapman. 1974; Fautin and Mariscal. 1991). but also as an effective circulatory apparatus, analogous to a primi- tive vascular system. The transport of metabolites within P. f. fulvitm colonies to several tens of centimeters in 24 h is faster than recorded for other corals (Pearse and Muscatine, 1971; Taylor. 1977; Gladfelter. 1983; Rinke- vich and Loya, 1983a, b; Rinkevich, 1991) in which trans- port has been attributed to simple diffusion (Pratt, 1905; Murdoch, 1978a; Fans et al., 1989). This rules out the 2500. oooooooo irsoiooiooioo I T- â <- OJ CM CO CO 'd- ^â 1 I I I I I I lO Ifi o in o If) CN (M f^ CO Distance from fusion line (mm) Figure 6. Distribution of '^C within the unlabeled colony of Par- er\thropodium fidvum fulvum in the field experiments (h = 6) 24 h after fusion. Bars indicate the mean number of disintegrations per minute (DPM) per square centimeter of coral tissue (± 1 SD) for the distance range from the fusion line. Numbers at the top of each bar are the sample sizes for each range of distances. No samples were taken between 201 and 300 mm from the fusion line. possibility that the recorded translocation is the result of a process other than gastrovascular transport, as it is in the marine bryozoan Membranipora membranacea (Miles el ai. 1995). The presence of the two distinct networks of canals indicates that they may have different functions. We pro- pose that an important function of the superficial network, which is located just under the upper ectodermal layer and is characterized by narrow canals, slow particle movement, and
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