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• W1997445955 abstract "1 A survey of acidified streams in the Loch Ard area of The Trossachs, Scotland, was carried out between 1986 and 1988, to determine the influence of physical and chemical factors on the distribution of benthic algae. Samples were taken on thirty-five occasions from fifteen sites on ten streams. Forty-nine operational taxa of filamentous algae were distinguished. Relative abundance of taxa in samples was scored on a seven-point scale. Estimates of standing crop were made by pigment extraction and ash-free dry weight (AFDW) determination from biomass developed on artificial substrata. 2 No evidence was found for seasonality in standing crop, nor for an increase in standing crop with a decrease in pH. Seasonality in relative abundance was evident for few taxa. Species richness and diversity were highly correlated with pH and correlated chemical variables. 3 Canonical correspondence analysis (CCA) carried out using the CANOCO program ordinates species and sites and relates them directly to environmental variables. The most important variable was found to be pH (or an acidification-related variable that is highly correlated with pH), with percentage forest cover and total oxidized nitrogen being of secondary importance. The effect of subdividing the data set, using data based on presence-absence as well as estimated relative abundance, was tested. A comparison of the effects on the distribution of site and species values on the pH vector showed that the results are robust, confirming the value of this semi-quantitative sampling method for use with a difficult algal group. It was possible to infer pH from algal community structure using CANOCO. 4 The pH ranking of species derived from CCA revealed that larger cell diameter taxa do not predominate at low pH, implying that reduction of invertebrate grazing was not an important determinant of algal community composition." @default.
• W1997445955 created "2016-06-24" @default.
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• W1997445955 date "1993-10-01" @default.
• W1997445955 modified "2023-10-06" @default.
• W1997445955 title "Filamentous algal communities related to pH in streams in The Trossachs, Scotland" @default.
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• W1997445955 doi "https://doi.org/10.1111/j.1365-2427.1993.tb00811.x" @default.
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