Hydroid Assemblages on Holopelagic Sargassum from the Sargasso Sea at Bermuda
Abstract:Hydroids on pelagic Sargassum natans and S. fluitans were studied in samples collected at Bermuda during March 1982 and April, September, and December 1992. Sixty thalli of each of the two algal species were examined. A total of 10 hydroid species was represented in these samples, eight on S. natans and all 10 on S. fluitans. Each of 120 thalli provided substrate for hydroids, the minimum number of species per thallus being two and the maximum seven. The three most frequent hydroid species, Obelia dichotoma, Plumularia strictocarpa, and Clytia noliformis, were found on a majority of the thalli of both S. natans and S. fluitans. Zanclea alba and Clytia hemisphaerica were also common on these algae. Clytia noliformis was observed on all 60 thalli of S. natans in the samples and was the dominant hydroid on a majority (83%) of them. Aglaophenia latecarinata was found only on S. fluitans, on which it was the principal hydroid dominant. Other hydroid species (Halopteris diaphana, Halecium nanum, Monotheca margaretta, and Dynamena disticha) were present on fewer than 20% of the thalli. Hydroid species composition was relatively homogeneous on thalli of a given algal species within a sample, and more heterogeneous from one collection period to another. Observed temporal variability was attributed to a complex of factors, including stochastic events, rather than simply to regular seasonal cycles. None of the 10 hydroid species investigated here is restricted to pelagic Sargassaceae or to the Sargassum community.
Document Type: Research Article
Publication date: March 1, 1995
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