. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 11 and nontusion at the growing edge between sibling colon i :!>ndes \iolaceus. a: Fusion, four days after settlement of the i . •. ooids. Common vascular system has been established, b: Nonfusion, a week after settlement, am. ampullae; o. oozooid. Scale Kirs « *• mm. disappeared and was filled with continuous test matrix containing normally distributed tunic cells (Fig. 4a-c). Fragments of cuticle were sometimes observed in the original boundary /one (Fig. 4b). In the case of nonfu- sion, the tunic layers sometimes fused
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 11 and nontusion at the growing edge between sibling colon i :!>ndes \iolaceus. a: Fusion, four days after settlement of the i . •. ooids. Common vascular system has been established, b: Nonfusion, a week after settlement, am. ampullae; o. oozooid. Scale Kirs « *• mm. disappeared and was filled with continuous test matrix containing normally distributed tunic cells (Fig. 4a-c). Fragments of cuticle were sometimes observed in the original boundary /one (Fig. 4b). In the case of nonfu- sion, the tunic layers sometimes fused, but only in small areas along the boundary. In the fused areas, tunic cells \\ere considerably more abundant than usual (Fig. 4d). In addition, blood cells (particularly morula cells) infil- trated the tunic from the blood vessels in the contact ar- eas (Fig. 4e). These cells were found clustered and disin- tegrated in the rejection zone. The disintegrated cells subsequently were released from the tunic in the form of massive aggregations (Fig. 4f). tip to side contacts occurred between ampullae of the two colonies, and then fusion took place at those sites to produce a common vascular system. In the case of non- fusion, ampullae of both colonies pushed against each other, but never penetrated the tunic of the facing col- ony. Although signs of rejection were not clearly visible in the contact area under the binocular stereomicro- scope, the necrotic rejections were evident in subsequent histological sections of the rejection zone (below •). Similar experiments between sibling oozooids gave similar results (Fig. 2). Out of the 32 combinations stud- ied. 14 resulted in fusion and 10 resulted in nonfusion. The results of the remaining eight combinations could not be assessed because of the degeneration or mechani- cal separation of the colonies. All xenogeneic combinations between B. violaceus and B. simodensis resulted in nonfusion reactions sim- ilar to those in incomp
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
