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Flora distribution maps of sea shore monitoring sites in Long Island and Roaringwater Bays, County Cork, Ireland, 1975-1982
Squires, K. (1982). Flora distribution maps of sea shore monitoring sites in Long Island and Roaringwater Bays, County Cork, Ireland, 1975-1982. Matt Murphy: Sherkin Island. 116 pp.

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    VLIZ: Marine Biology COB.38 [4925]


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  • Squires, K.

    This is the third in a series of species distribution maps, produced from studies at Sherkin Island. The following pages show the presence of algal species found during littoral surveys around Roaringwater Bay, County Cork. The data was collected between 1975 and 1982. This document is complimentary to the study of fauna compiled by Anna Martin B.Sc in 1982. The maps show presence or absence of species at 71 sites visited over the eight year period. Although the work does not indicate abundance, some knowledge of the species may be applied as an ordinal measure. Many of the maps however do indicate distribution, in relation to the exposure conditions found in the region. Charts I and II show the topography of the area and give some idea of this phenomenon. The islands provide sequential shelter from exposure to the south west. Fastnet Rock is not indicated here, it lies 6 km south west of Cape Clear. Some variance in the data may be expected due to the amount of data collected and the timescale involved. Below is a summary of the major difficulties. 1. Sites were visited at different intervals, some monthly and others annually. 2. Monitoring has been discontinuous in some cases. 3. Generally workers were renewed each year and this may have increased difficulties in species determination. Many species difficult to distinguish may be more widespread than documented. However due to repetition of visits, 2-5 for the annual sites and 5-25 for the monthlies, also the alternation of workers, most species present will have been recorded. Relocation of sites has been a problem especially in the early years of the survey, before permanent markers were established in 1980. However any site deviation has been considered small in relation to the scale of the map, and the indicators used in this work. In the following pages it will be noticed that some maps are for genera only, eg Cladophora species. This is where identification has been incomplete. However these maps do not include observations that have been positively determined, they are shown sequentially on separate maps. The unit hopes that this work provides a large quantity of useful information and will act as a baseline, and stimulus for further study. It is felt that long term observations such as these will outline natural fluctuations of species. From these, effects due to man's association with nature may be exposed.

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