East-west spatial groupings in intertidal communities, environmental drivers and key species

Julian Merder, Jan A. Freund, Lukas Meysick, Christina Simkanin, Ruth M. O’Riordan, Anne Marie Power

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Abstract

The rocky intertidal communities of Ireland contain a mix of cold- and warm-adapted species, however the spatial distribution of these communities has not been investigated in a systematic way. Based on a benthic community dataset collected in 2003 at 63 sites, several statistical analyses were combined with the aims of (i) detecting groups of similar communities and their spatial arrangement, (ii) relating these groups to environmental factors and (iii) identifying the species that drive the different community groups. Sørensen’s index suggested two marine community groups, one of the east and south-east (termed ‘east’) and the other in the west, south-west and north (termed ‘west’). A second partition based on combinedwave exposure and sea surface chlorophyll comprised four groups, as did a further partition based on combined sea surface and air temperatures. The spatial arrangement of wave height plus chlorophyll conditions agreed reasonably well with the binary marine community partition, but the temperature partition did not. The ‘east’ community appeared to be associated with low wave height and chlorophyll conditions. The species that were most influential to the ‘east’ community were Balanus crenatus, Austrominius modestus and Fucus vesiculosus. The ‘west’ sites were associated with high waveheight/low chlorophyll (with some variation in this due to local shelter) and the species Paracentrotus lividus,Chthamalus stellatus, Alaria esculenta and Himanthalia elongata. A longitudinal pattern rather than one associated with latitude was evident in this marine community and local drivers rather than temperature clines appeared most important for the dominant community patterns.

Original languageUndefined/Unknown
Pages (from-to)423–435
JournalJournal of the Marine Biological Association of the UK
Volume98
Issue number2
DOIs
Publication statusPublished - 2018
MoE publication typeA1 Journal article-refereed

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