Macroalgae and phytoplankton as indicators of ... - Naturstyrelsen

3.4 Results
3.4.1 Descriptive analyses of the algal community
Data on the various algal variables were modelled based on fixed variation
between areas, sub-areas and sites within each sub-area as well as
on variation between depth intervals, substrate composition in depth intervals,
seasonal variation and year-to-year variation (Table 3.5). Moreover,
the model took into account stochastic variation due to variation
between sub-samples, diver effects and residual variation (Table 3.6). The
next paragraphs describe the different components of variation for each
of the analysed algal variables.
Table 3.5 Each of the algal variables: total cover (Tot. cov.), cumulated algal cover (Cum. cov.), cumulated cover of opportunists
(Cum. opp. cov.), cumulated cover of late-successional species (Cum. late cov.), fraction of opportunists (Frac. opp.) and number
of late-successional species (Species no. late) was modelled in relation to a number of fixed and stochastic model components
(first column). The table shows P-values for each model component for each of the modelled algal variables. The total
number of observations within each model was 2668.
Model component
Tot.
cov.
Cum.
cov.
Cum.
late cov
Cum.
opp. cov.
Frac.
opp.
Species
no. late
Fixed effects
- Area