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LIST OF FIGURES
Figure 1.1 Map of the Firth of Forth showing the position of Drum Sands . 12
Figure 1.2 Map of Drum Sands showing the position of the study area . . 13
Figure 1.3 Profile of Drum Sands . . 14
Figure 2.1 Layout of plots for transect survey . 20
Figure 2.2 Sample layout of the 1 m and 8m grid surveys . • 24
Figure 2.3 Species abundances from transect survey (i-vi). • 28
Figure 2.4 Sediment results from transect survey (i-iv) . • 30
Figure 2.5 Contour maps from lm survey (i-vi) . • 39
Figure 2.5 Contour maps from 1 m survey (vii-xii). • 40
Figure 2.6 Correlograms for the fauna and sediments from lm survey (i-ix) • 41
Figure 2.7 Contour maps from 8m survey (i-vi) . • 44
Figure 2.7 Contour maps from 8m survey (vii-xii). . 45
Figure 2.8 Correlograms for the fauna and sediments from 8m survey (i-viii) • 46
Figure 2.9 Contour maps from 40m survey (i-viii). 47
Figure 2.9 Contour maps from 40m survey (ix-xv) . 48
Figure 2.10 Correlograms for the fauna and sediments from the 40m survey . 49
(i-viii)
Figure 2.10 Correlograms for the fauna and sediments from the 40m survey . 50
(ix-xiii)
Figure 3.1 Regression line of 5th setiger width against length for P. elegans . 66
Figure 3.2 Size-frequency histograms of P. elegans (i-ix) . . . 69
Figure 3.3 Mean numbers of male and female P. elegans and sex ratio . . 70
Figure 3.4 Mean number and percentage of female tubes containing embryos . 71
or larvae
Figure 3.5 Size-frequency histograms of P. elegans larvae from adult female
tubes (i-vi)
Figure 4.1 Diagram showing the location of experimental blocks and natural
weed mat establishment during 1996
. 88
Figure 4.2 Experimental layout of weed implantation experiment treatments . 89
Figure 4.3 Mean species abundances for initial, 6 weeks and 20 weeks results
(i-iii)
. 95
Figure 4.4 Sediment water, organic and silt/clay contents and granulometry
results for initial, 6 weeks and 20 weeks samples (i-iii)
. 96
Figure 4.5 Redox potentials for initial, 6, 12 and 20 weeks samples (i-iii) . 98
Figure 4.6 Size-frequency results of P. elegans after 6 and 20 weeks (i-i) . 99
Figure 5.1 Random layout of weed and non-weed plots for weed survey . . 112
Figure 5.2 Faunal results for the weed and non-weed plots after 4 and 20.
weeks (i-i)
. 117
Figure 5.3 % water, organic and silt/clay contents and granulometry results . 119
x
. 73