Macroalgae and phytoplankton as indicators of ... - Naturstyrelsen
Macroalgae and phytoplankton as indicators of ... - Naturstyrelsen
Macroalgae and phytoplankton as indicators of ... - Naturstyrelsen
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3.4.3 Algal variables in relation to physico-chemical variables<br />
The area-specific modelled marginal means <strong>of</strong> algal variables were related<br />
to the area-specific modelled means <strong>of</strong> the physico-chemical variables<br />
through multiple regression analysis. In these analyses mean cover<br />
levels for each co<strong>as</strong>tal area represented an average water depth <strong>of</strong> 7 m, a<br />
substratum composed <strong>of</strong> 50% hard bottom <strong>and</strong> July <strong>as</strong> the sampling<br />
month.<br />
We found a similar tendency for all tested algal variables: they were related<br />
to the concentration <strong>of</strong> total nitrogen <strong>and</strong> salinity <strong>and</strong>/or interactions<br />
between them. An interaction between effects <strong>of</strong> TN <strong>and</strong> salinity<br />
means that the effect <strong>of</strong> TN depends on the salinity or vice versa. No<br />
other physico-chemical variables improved the relationships (Table 3.9).<br />
All relationships were highly significant <strong>and</strong> could explain from 66 to<br />
80% <strong>of</strong> the variation in algal variables (0.6349