The distribution of Alcyonidium species (Bryozoa) in Orkney and Shetland, with faunistic notes on some locations

John S. Ryland, Joanne S. Porter

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Abstract

Nine major intertidal sites in Orkney and nine in Shetland were visited to
determine the presence of Alcyonidium spp., together with other bryozoans,
ascidians, hydroids and sponges, and salient ecological characteristics.
Alcyonidium gelatinosum and A. hirsutum were widespread and abundant on
fucoid and other algae; A. diaphanum (mainly subtidal) was found
occasionally; A. polyoum was not found and is presumed absent. The
distributions are discussed. The associated sessile fauna from the shores is
listed. Certain sites were faunistically very rich: the rocky spit in the Bay of
Ham, Rousay and St. Peter’s Bay on the mainland, in Orkney, and the narrow
channel between Muckle Roe and the mainland and the narrow passage of
Bridge End between East and West Burra, in Shetland, were outstanding and
should be conserved.
Original languageEnglish
Pages (from-to)129-146
Number of pages18
JournalThe Shetland Naturalist
Volume2
Issue number3
Publication statusPublished - 2008

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