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90 — 80 — "-e-' 70 — 60 — 40— -1§.30 '5 — 20 — 10 — 60 ±). 50 — r.14 40 — o..) to 1,5 30- 0 0 20 — = 10- 0 *** ** (i) 4 Weeks • Non-weed plots 0 Weed plots 0 c.) ' -' o .7:1 ..E. C.) -o = 0.) 0 V ct -c-z, c Li ..n o. a) C/3 0 e co co ra; 14 ..t 186.8 ** Nis . 0 c,:s cl ..- • u ... ..a. la%•t) . .. C-) Li ..0 Li (ii) 20 Weeks • Non-weed plots 0 Weed plots ..o vi ** .1`--1-1 I —II I .1.11-1 I I co Cl ..r... ct .4 (1 = 4-.• EI) 0 C.) C..) 'Ztl a) 0 C.) 3 . 0 -.= C/i 0 O.) 0) at 0 ..0 c.) c..) 0 0.: t:ID Figures 5.2(i-ii): Faunal results for the weed plots and the non-weed plots (± S.E.Mean, n.6); (i) 4 weeks and (ii) 20 weeks after V. subsimplex mat establishment. * Denotes a significant difference between the 2 plot types with p
Sediment water, organic and silt/clay contents and granulometry - The results of the physical properties of the sediments (% water, % organics, % silt/clay, Md 4) and sorting coefficient) for the 4 weeks and 20 weeks samples are given in Figures 5.3(i) and (ii) respectively. All these variables were analysed after an arcsine transformation (Zar, 1984). The results show that after 4 weeks the weed had a significant effect on all the measured sediment variables, increasing their values compared to the non-weed plots (p
- Page 82 and 83: corresponds to 44 setigers using Eq
- Page 84 and 85: 1 0000000 00 rg 0 00 d- - Xauanbau
- Page 86 and 87: Reproductive activity of Pygospio e
- Page 88 and 89: P. elegans larvae at Drum Sands hav
- Page 90 and 91: Pygospio elegans showed great seaso
- Page 92 and 93: Previous studies have produced simi
- Page 94 and 95: The sole reliance on a planktonic m
- Page 96 and 97: abundance are highly seasonal, were
- Page 98 and 99: CHAPTER 4 THE EFFECTS OF MACROALGAL
- Page 100 and 101: studies may have been completely di
- Page 102 and 103: METHODS Study site - The exact posi
- Page 104 and 105: 1 C N W 4----111" 1.5m 2 NW C Contr
- Page 106 and 107: sediment sampling, together with re
- Page 108 and 109: RESULTS Species abundances - The me
- Page 110 and 111: ; 15 35 — 30 — 25 — 10 — 5
- Page 112 and 113: statistical difference from net plo
- Page 114 and 115: Pygospio elegans size distribution
- Page 116 and 117: used, approximately equivalent to t
- Page 118 and 119: artefacts associated with the metho
- Page 120 and 121: present in high numbers around sewa
- Page 122 and 123: lack, hydrogen sulphide-smelling se
- Page 124 and 125: CHAPTER 5 THE EFFECTS OF MACROALGAL
- Page 126 and 127: METHODS Survey design - During late
- Page 128 and 129: The sediments could not be sampled
- Page 130 and 131: RESULTS Species abundances - Table
- Page 134 and 135: 35 — *** 30 25 — 1.) = .-c‘l
- Page 136 and 137: Pygospio elegans size distributions
- Page 138 and 139: which is difficult to compare with
- Page 140 and 141: eason why some invertebrates showed
- Page 142 and 143: This study did not set out to expli
- Page 144 and 145: This reliance upon the early establ
- Page 146 and 147: CHAPTER 6 INITIAL COLONISATION OF D
- Page 148 and 149: esulting community at any stage of
- Page 150 and 151: ambient sediment had been removed.
- Page 152 and 153: emoved since they were the only tax
- Page 154 and 155: All statistics were performed using
- Page 156 and 157: RESULTS Univariate analysis of spec
- Page 158 and 159: 3.5 3 5 2 11 5 1 0.5 0 40 35 Ca 30
- Page 160 and 161: of non-patch areas (Figure 6.3(vi))
- Page 162 and 163: the individuals colonising patch az
- Page 164 and 165: Multivariate analysis of community
- Page 166 and 167: Month Sample statistic (Global R) N
- Page 168 and 169: 2NP 3NP 4NP .•,, 6NP 5NP 6P 1NP i
- Page 170 and 171: Figure 6.8: Two-dimensional MDS ord
- Page 172 and 173: - - 5P ... 4P . 6P • .‘2NP 1NP
- Page 174 and 175: I 50. 1 60. 70. 80. 90. 100. BRAY-C
- Page 176 and 177: 'P2-AZ P3-AZ N2-AZ .- - - " .„ ..
- Page 178 and 179: o • o -o + 350 — 300 = 250 7 g
- Page 180 and 181: The importance of the ambient commu
Sediment water, organic and silt/clay contents and granulometry - The results of<br />
the physical properties of the sediments (% water, % organics, % silt/clay, Md 4) and<br />
sorting coefficient) for the 4 weeks and 20 weeks samples are given in Figures 5.3(i)<br />
and (ii) respectively. All these variables were analysed after an arcsine transformation<br />
(Zar, 1984). The results show that after 4 weeks the weed had a significant effect on<br />
all the measured sediment variables, increasing their values compared to the non-weed<br />
plots (p
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