In contrary, although no movements towards prey were observed, the free-moving polychaete when passing by the polyp's mouth was suddenly immobilized and drawn U-shaped into the gastrovascular
- When gastrovascular
connections formed between the two sibling explants, usually accompanied by visible exchange of fluid and particles between the explants, and persisted for at least seven months after initial contact, we scored the interaction as compatibility.
In this stage, a distinct [alpha]-tubulin-LIR neuropil could also be observed flanking the entire upper part of the rhopalium between the gastrovascular
cavity and the epidermal layer, connecting to the epidermal nerve in the stalk (Fig.
For group-2, the identifiable structures were: epidermis and rhabdites, layer of longitudinal muscular fibers, lumen of pharynx, pharynx cavity, gastrovascular
cavity, parenchyma and bowel lumen--see Figure 4.
The preparations were fractured under a compound microscope, using the tips of fine forceps, and the gastrovascular
cavities were then carefully exposed.
Metabolic processes create conditions in the gastrovascular
cavity and tissues of corals that differ from those on the open reef (Kuhl et at., 1995; Venn et al., 2009; Gordon and Leggat, 2010; Agostini et al., 2011), and aspects of these conditions affect algal photo-physiology.
Experimental colonies are grown on 15-mm-diameter round cover glass, which allows for clear visualization of the gastrovascular
system of the stolons.
Second, it is possible that flow stimulates photosynthesis until the speed is sufficient to compress the coral tissue and impede both transport of metabolites through gastrovascular
canals (Gladfelter, 1983) and exchange with seawater through a reduction in exposed tissue area.
At this stage, the blastopore was closed and there was no coelenteron (= gastrovascular
cavity) observed in histological examination (Fig.
In colonial cnidarians and ascidians, common coelomic cavities or gastrovascular
circulatory systems enable the transfer of resources between colony regions (Carle and Ruppert, 1983; Gladfelter, 1983; Mackie, 1986; Gateno et al., 1998; Cartwright, 2003).
In contrast, tentacles form at the bell margin and gonads are protected within the bell in Pelagiidae and Ulmaridae, and gastrovascular
canals are absent from Pelagiidae (Kramp, 1961: p.
Studies of the functional biology of cnidarian gastrovascular
systems typically implicate both cilia and muscular contractions.