. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. TUBE GROWTH IN CLONAL SERPULIDS 113. Figure 4. Growth beyond the escape hatch in tubes of Salmacina amphidentata. (A) A recently opened hatch, with the calcareous disc still precariously attached to the parent's tube. The bud that opened the hatch has started to build its own tube from the opening. Scale bar = 750 /xm. (B) A recently opened escape hatch in section. The parent's tube is growing towards the lower left. Note that the bud has completely blocked off the parent's tube with its own tube material (asterisk) and that
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. TUBE GROWTH IN CLONAL SERPULIDS 113. Figure 4. Growth beyond the escape hatch in tubes of Salmacina amphidentata. (A) A recently opened hatch, with the calcareous disc still precariously attached to the parent's tube. The bud that opened the hatch has started to build its own tube from the opening. Scale bar = 750 /xm. (B) A recently opened escape hatch in section. The parent's tube is growing towards the lower left. Note that the bud has completely blocked off the parent's tube with its own tube material (asterisk) and that the bud's tube is continuous with the peristome secreted by the parent prior to the formation of the escape hatch. The black material in the parent's tube is organic debris. Scale bar = 250 /xm. bt = new tube formed by bud, di = calcareous disc, pt = parental tube. with the peristome formed by the parent immediately prior to constructing the escape hatch (Fig. 4B), but it usually curved back down to the substratum rapidly. A new bud would often build a peristome and escape hatch in its new tube just a few hundred micrometers beyond its point of emergence from the parent's tube. This new escape hatch was eventually used by the bud's own asexually produced offspring 1 to 2 weeks later. This growth pattern was seen several hundred times in laboratory-raised aggregations. In field-collected aggrega- tions, events of asexual reproduction and tube growth were more difficult to follow, because the substrate was opaque, the aggregations were composed of dense masses of tubes, and tubes were partly covered with other encrusting organ- isms. Nevertheless, all stages of skeletal growth described above were seen regularly in aggregations collected from the field. Peristomes in tubes were almost always immedi- ately followed by either escape hatches or tubes branching off. The junction between a parental tube and the tube of a bud was always located immediately distal to a peristome in the
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
