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11.4 Linking biota to multivariate environmental patterns
The intuitive premise adopted here is that if the suite of environmental variables responsible fo...
11.3 Linking biota to univariate environmental measures (and examples)
Univariate community measures If the biotic data are best summarised by one, or a few, simple uni...
11.2 Example: Garroch Head macrofauna
For the 12 sampling stations (Fig. 8.3) across the sewage-sludge dump ground at Garroch Head {G},...
11.1 Introduction
Approach In many studies, the biotic data is matched by a suite of environmental variables measur...
10.2 Examples
Multivariate examples Nutrient-enrichment experiment In the soft-bottom mesocosms at Solbergstr...
10.1 Species aggregation
Fig. 10.1a repeats the multivariate ordination (nMDS) seen in Fig. 1.7 for the macrofaunal data f...
9.6 Example: Fal estuary copepods
and present biotic and environmental data from five creeks of the Fal estuary, SW England, whos...
9.5 Dispersion weighting
There is a clear dichotomy, in defining sample similarities, between methods which give each vari...
9.4 Recommendations
The transformation sequence in a multivariate analysis, corresponding to a progressive downweight...
9.3 Multivariate case
There being no necessity to transform to attain distributional properties, transformations play a...
9.2 Univariate case
For purely illustrative purposes, Table 9.1 extracts the counts of a single Thyasira species from...
9.1 Introduction
There are two distinct roles for transformations in community analyses: a) to validate statistica...
8.7 Multiple diversity indices
A large number of different diversity measures can be computed from a single data set and it is r...
8.6 Example: Plymouth particle-size data
Fig. 8.15 is from Coulter Counter data of particle-size distributions for estuarine water samples...
8.5 Multivariate tools used on univariate data
Ekofisk macrofauna: testing dominance curves Fig. 8.5b compares the averaged community samples fo...
8.4 Examples: Loch Linnhe and Garroch Head macrofauna
ABC curves for the macrobenthos at site 34 in Loch Linnhe, Scotland {L} between 1963 and 1973 are...
8.3 Examples: Garroch Head and Ekofisk macrofauna
Plots of geometric abundance classes along a transect across the Garroch Head {G} sewage-sludge d...
8.2 Graphical/distributional plots
The purpose of graphical/distributional representations is to extract information on patterns of ...
8.1 Univariate measures
A variety of different statistics (single numbers) can be used as measures of some attribute of c...
7.10 Bubble plots (plus examples)
Bubble plots Abundance (or density, biomass, area cover etc) for a particular species can be show...