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dc.contributor.authorSimkanin, Christina
dc.contributor.authorPower, Anne Marie
dc.contributor.authorMyers, Alan
dc.contributor.authorMcGrath, David
dc.contributor.authorSouthward, Alan
dc.contributor.authorMieszkowska, Nova
dc.contributor.authorLeaper, Rebecca
dc.contributor.authorO'Riordan, Ruth
dc.identifier.citationSimkanin, Christina; Power, Anne Marie; Myers, Alan; McGrath, David; Southward, Alan; Mieszkowska, Nova; Leaper, Rebecca; O'Riordan, Ruth (2005). Using historical data to detect temporal changes in the abundances of intertidal species on irish shores. Journal of the Marine Biological Association of the UK 85 (6), 1329-1340
dc.description.abstractAn historical data set, collected in 1958 by Southward and Crisp, was used as a baseline for detecting change in the abundances of species ill the rocky intertidal of Ireland. In 2003, the abundances of each of 27 species was assessed using the same methodologies (ACFOR [which stands for the categories: abundant, common, frequent, occasional and rare] abundances scales) at 63 shores examined in the historical study. Comparison of the ACFOR data. over a 45-year period, between the historical Survey and re-survey, showed statistically significant changes in the abundances of 12 of the 27 species examined. Two species (one classed as northern and one introduced) Increased significantly in abundance while ten species (five classed as northern, one classed as southern and Four broadly distributed) decreased in abundance. The possible reasons for the changes in species, abundances were assessed not only in the context of anthropogenic effects, such as climate change and commercial exploitation, but also of operator error. The error or differences recorded among operators (i.e. research scientists) when assessing species abundance using ACFOR categories was quantified oil four shores. Significant change detected ill three of the 12 species fell within the margin of operator error. This effect of operator may have also contributed to the results of no change in the other 15 species between the two census periods. It was not possible to determine the effect of operator oil Our results, Which Call Increase the occurrence of a false positive (Type 1) or of a false negative (Type 2) outcome.
dc.publisherCambridge University Press (CUP)
dc.relation.ispartofJournal of the Marine Biological Association of the UK
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Ireland
dc.subjectelminius-modestus darwin
dc.subjectrecent climate-change
dc.subjectbiological invasions
dc.subjectcovering behavior
dc.subjectmarine ecosystems
dc.titleUsing historical data to detect temporal changes in the abundances of intertidal species on irish shores

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