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Biol Bull 166: 54-67. (February 1984)
© 1984 Marine Biological Laboratory
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BIOLOGY OF HYDRACTINIID HYDROIDS. 1. COLONY ONTOGENY IN HYDRACTINIA ECHINATA (FLEMMING)

CATHERINE S. MCFADDEN 1, MARGARET J. MCFARLAND 1, and LEO W. BUSS 1

1 Department of Biology, Yale University, New Haven, Connecticut 06511

The colonial marine hydroid, Hydractinia echinata, exhibits a wide range of growth morphologies during ontogeny, from sheet-like colonies of uniform ectodermal mat to colonies which produce complex networks of stolons. Colony ontogeny was quantified under uniform environmental conditions for 70 colonies of H. echinata, with data collected on the growth rates of the three major colony parameters: mat tissue, stolon tissue, and polyps. Analysis of the relative growth rates of the tissues clearly illustrates that variability in colony form between colonies can be attributed to continuous variation in just one of the parameters governing colony ontogeny.

Submitted on August 18, 1983
Accepted on November 23, 1983




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