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40m
LOW WEED COVER (10-25%)
0 0
El 0
HIGH WEED COVER El
(40-50%)
0 • CI 0 o
NO WEED COVER
ci El El 0 o o o o o
14 AREA OF WEED IMPLANTATION
EXPERIMENT
0 0 0 0 0 0 0 0
Figure 4.1: Diagram showing the location of the experimental blocks and the extent
of natural weed mat establishment during the summer 1996. 40m intervals shows
sample sites from 40m survey (see Chapter 2).
Algae for the experiment were collected from Dalgety Bay, on the north coast of the
Firth of Forth, approximately 3 miles (straight line distance) from Drum Sands. The
algae (Enteromorpha prolifera) were washed thoroughly in seawater on collection to
remove associated fauna. The algae were later examined for fauna, very few
invertebrates remained and only Hydrobia ulvae remained in sufficiently high
numbers (more than 1 individual per lkg wet biomass of weed) to necessitate omitting
this species from later analysis. Since H. ulvae were not very abundant, it was
assumed that any between treatment differences observed were not due to differences
in H. ulvae densities.
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