Circulation of perivisceral fluid in the sea urchin Lytechinus variegatus

The principal driving mechanism of perivisceral-fluid circulation was investigated in the echinoid Lytechinus variegatus by metal-clad hot-wire anemometry. Analysis of 23 flow profiles from 13 individuals collected from 1 to 3 m water depth at Tarpon Springs and Sarasota, Florida (USA) in 1984 indic...

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Bibliographic Details
Published in:Marine biology 1986-01, Vol.92 (1), p.125-134
Main Authors: HANSON, J. L, GUST, G
Format: Article
Language:English
Subjects:
Biological and medical sciences
Echinodermata
Fundamental and applied biological sciences. Psychology
Invertebrates
Lytechinus variegatus
Marine
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Summary:The principal driving mechanism of perivisceral-fluid circulation was investigated in the echinoid Lytechinus variegatus by metal-clad hot-wire anemometry. Analysis of 23 flow profiles from 13 individuals collected from 1 to 3 m water depth at Tarpon Springs and Sarasota, Florida (USA) in 1984 indicates that for this species, the ciliated epithelium is an ineffective driving mechanism for mixing of the perivisceral fluid. Instead, the Aristotle's lantern is the major driving force of circulation of the perivisceral fluid, with velocity fluctuations of less than or equal to 1.5 mm s super(-1) amplitude in the cavity center during intermittent periods of activity. These fluctuations rapidly decay as the ciliated surfaces are approached. Spectral analysis of velocity time-series reveals predominant energy-containing velocity fluctuations between 0.007 and 0.05 Hz.
ISSN:0025-3162
1432-1793
DOI:10.1007/BF00392754