Seasonality of Hydroids (Hydrozoa, Cnidaria) from an intertidal pool and adjacent subtidal habitats at Race Rocks, off Vancouver Island, Canada

Posted October 19, 1995 | Categories : 97,Rare Species,Research,Species List |

Anita Brinckmann-Voss Published in Scientia  Marina 1996 ( SCI MAR.,60(1):89-97 ) Advances in Hydroid Biology.  S. Piraino, F. Boero J. Bouillon, P.F.S. Cornelius and J.M. Gilli (eds.)

SUMMARY: An assemblage of 27 hydroid species was reported from a tide pool in the lower rocky intertidal zone, and compared with 42 hydroids of the adjacent subtidal region. Location of hydroids within the pool, seasonal occurrence, growth and sexual maturity were tabulated, and some systematic aspects discussed . Possible causes of hydroid species diversity were considered, including location of the tide pool in an area of tidal rapids, and shading by surfgrass and rock cliffs during low tide.

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Sarsia exima , one of the tidepool species. Photo by Anita Brinckmann-Voss