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| Titel: |
Colonial coordination in anthozoans: Pennatulacea |
| Auteur: |
Satterlie, Richard A. Anderson, Peter A. V. Case, James F. |
| Verschenen in: |
Marine & freshwater behaviour & physiology |
| Paginering: | Jaargang 7 (1980) nr. 1 pagina's 25-46 |
| Jaar: |
1980 |
| Inhoud: |
Morphological and physiological evidence from five species of pennatulid octocorals indicates that a through-conducting colonial nerve net controls colony-wide responses including polyp withdrawal, bioluminescence and rachidial contraction. This nerve net is synaptic, and located in the ectoderm and mesoglea of the colonial tissue. Nerve net impulses recorded extracellularly, show initial increases in conduction velocity during repetitive stimulation which promote facilation of effectors. The response-amplitude of these effectors is frequency dependent. Bridge experiments suggest that interneural facilitation may contribute to the conduction velocity changes. Photometric measurements with concurrent electrophysiological recordings reveal that bioluminescence is under the control of the colonial nerve net. Luminescent responses show a frequency-dependent facilitation similar to that of other effectors. These physiological data, together with morphological data on the location and shape of autozooid photocytes suggest that the photocytes may be modified circular or radial muscle cells. A second through-conducting colonial system was detected in three pennatulid species, the function of this system, however, was not evident. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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