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NP1 NP2 NP2 NP2 NP1 NP1 NP2 NP2 NP2 NP1 NP1 P1 NP1 P1 P1 P1 P1 P1 P2 P2 P2 P2 P2 P2 NP3 P3 P3 P3 P3 P3 P3 NP3 NP3 NP3 NP3 NP3 P4 P4 P4 P4 P4 P4 NP4 NP4 NP4 NP4 NP4 NP4 I I I I I I I 40. 50. 60. 70. 80. 90. 100. BRAY-CURTIS SIMILARITY (To ) Figure 8.10: Dendrogram of all patch (P) and non-patch (NP) replicates, using group- average clustering from Bray Curtis similarities on 4-transformed abundances. The months April, August and December 1997 and August 1998 are labelled as 1,2,3 and 4 respectively. 221
;.N3 P2 .• FFI1 P3 P1 P1 Pi-t2 P3 PP3 P2 P2 Ni P2 N3 NI-3--..N..1.1n101 —"NI Ni 2 N1N2 N2 Patch N2 Ni Non-patch N4 N4N4N4 Figure 8.11: Two-dimensional ordination plot of all patch (P) and non-patch (N) replicates. The months April, August and December 1997 and August 1998 are labelled as 1,2,3 and 4 respectively. Dashed lines represent groups formed by patch and non-patch replicates. Stress = 0.14. 222 N4 N4:
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AN INVESTIGATION INTO THE PROCESSES
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ABSTRACT The spionid polychaete Pyg
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ACKNOWLEDGEMENTS I am indebted to m
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Results. . 65 Size distribution of
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CHAPTER 9. GENERAL DISCUSSION . . 2
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Figure 5.4 Figure 5.5 Figure 6.1 Fi
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LIST OF TABLES Table 2.1 Statistica
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BACKGROUND CHAPTER 1 INTRODUCTION A
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The scales of observation, or the s
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systematic sampling design to inves
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aised sediment within an otherwise
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Fauchald and Jumars (1979) describe
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Dalmeny House and sewage discharged
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E 7— E 6-ac. MHWS MHWN t co 4 —
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variance (TTLQV) techniques (see Lu
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analysis using Moran's and Geary's
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Holme and McIntyre (1984). Percenta
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Pattern Analysis - Grid Surveys Sur
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57 64 1=1 0 0 0 0 0 0 0 O 0 0 0 0 0
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Maps produced by kriging and other
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200 180 1160 140 100 1-3 80 g 60 c.
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2.5 1.5 0.5 0 3 T (i) % Silt/clay%
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v : m pattern Id pattern Ip pattern
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" v : m pattern Id pattern Ip patte
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The results show that at the smalle
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Nephtys hombergii's spatial distrib
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(vii) G. duebeni (ix) % Organic con
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8m survey - spatial patterns Figure
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(1) P. elegans (iii) L. conchilega
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a) Ts 1.4 0.6 u 0.2 -0.2 1.4 'E5 0.
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200m 150m 100m 50m (ix) C. edule 56
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73 ‘a• el 1.4 (ix) G. duebeni 1
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DISCUSSION The main aims of this st
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formed patches less than 1m2 and th
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stutchbutyi, at Wirroa island, New
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exhibited by the tube-building poly
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CHAPTER 3 THE POPULATION STRUCTURE
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Asexual reproduction by fragmentati
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METHODS Survey design - It has been
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RESULTS The species abundances in e
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corresponds to 44 setigers using Eq
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1 0000000 00 rg 0 00 d- - Xauanbau
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Reproductive activity of Pygospio e
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P. elegans larvae at Drum Sands hav
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Pygospio elegans showed great seaso
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Previous studies have produced simi
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The sole reliance on a planktonic m
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abundance are highly seasonal, were
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CHAPTER 4 THE EFFECTS OF MACROALGAL
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studies may have been completely di
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METHODS Study site - The exact posi
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1 C N W 4----111" 1.5m 2 NW C Contr
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sediment sampling, together with re
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RESULTS Species abundances - The me
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; 15 35 — 30 — 25 — 10 — 5
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statistical difference from net plo
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Pygospio elegans size distribution
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used, approximately equivalent to t
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artefacts associated with the metho
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present in high numbers around sewa
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lack, hydrogen sulphide-smelling se
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CHAPTER 5 THE EFFECTS OF MACROALGAL
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METHODS Survey design - During late
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The sediments could not be sampled
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RESULTS Species abundances - Table
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90 — 80 — "-e-' 70 — 60 — 4
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35 — *** 30 25 — 1.) = .-c‘l
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Pygospio elegans size distributions
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which is difficult to compare with
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eason why some invertebrates showed
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This study did not set out to expli
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This reliance upon the early establ
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CHAPTER 6 INITIAL COLONISATION OF D
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esulting community at any stage of
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ambient sediment had been removed.
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emoved since they were the only tax
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All statistics were performed using
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RESULTS Univariate analysis of spec
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3.5 3 5 2 11 5 1 0.5 0 40 35 Ca 30
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of non-patch areas (Figure 6.3(vi))
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the individuals colonising patch az
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Multivariate analysis of community
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Month Sample statistic (Global R) N
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2NP 3NP 4NP .•,, 6NP 5NP 6P 1NP i
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Figure 6.8: Two-dimensional MDS ord
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- - 5P ... 4P . 6P • .‘2NP 1NP
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I 50. 1 60. 70. 80. 90. 100. BRAY-C
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'P2-AZ P3-AZ N2-AZ .- - - " .„ ..
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o • o -o + 350 — 300 = 250 7 g
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The importance of the ambient commu
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In April, when P. elegans larval av
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not only for errant polychaetes, bu
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observed in this study. How crucial
Page 188 and 189: Micro-scale spatial patterns of mac
Page 190 and 191: METHODS Experimental design - A pre
Page 192 and 193: study. These individuals would not
Page 194 and 195: RESULTS Pilot survey - The pilot su
Page 196 and 197: Transect survey - Micro-scale patte
Page 198 and 199: Month v:m ratio pattern Id pattern
Page 200 and 201: (i) March 1997, replicate 1 -iAlmiA
Page 202 and 203: (xix) October 1997, replicate 1 (ra
Page 204 and 205: The new recruits were only sufficie
Page 206 and 207: The results of correlation analyses
Page 208 and 209: cf.) . crt N ,—, Cr) C,1 ,—, Cr
Page 210 and 211: 1.2 -0.4 "a 0.8 > (i) % Water conte
Page 212 and 213: examine the micro-scale spatial pat
Page 214 and 215: Invertebrate larvae, those of polyc
Page 216 and 217: laboratory observations are needed
Page 218 and 219: CHAPTER 8 THE FAUNAL COMMUNITIES OF
Page 220 and 221: Other theories have been postulated
Page 222 and 223: RESULTS Univariate analysis of spec
Page 224 and 225: -T. g 80 g 50 40 30 20 10 (i) Adult
Page 226 and 227: in significant differences in size
Page 228 and 229: 8.2). This was mainly because of th
Page 230 and 231: 120 100 80 60 - 40 20 0. cn1 c.n (i
Page 232 and 233: 3NP 6NP 4NP 1 NP 5NP 2NP : 3P 1P 6P
Page 234 and 235: 4P 3P 5P 5NP 6P 2P 1P Figure 8.8: T
Page 236 and 237: Figure 8.10 shows the dendrogram pr
Page 240 and 241: Sediment water, organic and silt/cl
Page 242 and 243: 5 350 — 300 250 200 — ISO — 1
Page 244 and 245: abundances of P. ciliata had more d
Page 246 and 247: levels of silt/clay and organics. S
Page 248 and 249: 1973; Noji and Noji, 1991). Competi
Page 250 and 251: shown to consume up to 68% of a 0-g
Page 252 and 253: In Chapter 7 the micro-scale spatia
Page 254 and 255: and positions of patches. Consequen
Page 256 and 257: epresent those found establishing i
Page 258 and 259: distribution at the micro-scale. Ad
Page 260 and 261: provide a rich food source for deme
Page 262 and 263: Armonies W., 1988. Active emergence
Page 264 and 265: Cha M.W., in prep. Macroalgal mats
Page 266 and 267: Dobbs F.C. and Vozarik J.M., 1983.
Page 268 and 269: Flach E.C., 1996. The influence of
Page 270 and 271: Hall SI, Raffaeni D.G., Basford DJ.
Page 272 and 273: Keckler D., 1997. Surfer for Window
Page 274 and 275: Levin L.A. and Creed E.L., 1986. Ef
Page 276 and 277: Mileikovsky S.A., 1971. Types of la
Page 278 and 279: Ong B. and Krishnan S., 1995. Chang
Page 280 and 281: Raffaelli D.G., Hildrew A.G. and Gi
Page 282 and 283: Scheltema R.S., 1974. Biological in
Page 284 and 285: Soulsby P.G., Lowthion D., Houston
Page 286 and 287: McArdle B.H., Morrisey D., Schneide
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Wharfe J.R., 1977. An ecological su
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Zajac R.N. and Whitlatch R.B., 1982
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- C'e) oc0000mooF,o•-ooNtn-coo-00
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APPENDIX 1.2: SPECIES ABUNDANCES FR
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ON In co In ° ken n00000N---0g0N-.
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o m000eno,-0-. 0 0000en ,-. 0.-00 o
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APPENDIX 2: SPECIES ABUNDANCES FROM
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0.- CV N - , .- CI E.104 ..r cv g.,
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cv en 0 a .- ,- .- .- g c', ,- ,- g
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PI — — — Pi n — — - R., .
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P . en .2 Co in ,.. ne .- cq . -- -
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