State of the Bay Report 2010-Final - Anchor Environmental

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Percentage cover Percentage cover Percentage cover Percentage cover 12 12 10 10 8 6 4 2 0 8 6 4 80 70 60 50 40 30 20 10 0 80 70 60 50 40 30 20 10 0 2 0 High 05 High 08 High 09 High 05 High 08 High 09 High 10 Mid 05 Mid 08 Aulacomya ater Mytilus galloprovincialis High 05 High 08 High 09 High 05 High 08 High 09 High 10 Mid 05 Mid 08 Mid 09 Mid 10 Mid 09 Mid 10 Low 05 Low 08 Low 05 Low 08 Aulacomya ater Mytilus galloprovincialis Balanus glandula High 10 Mid 05 Mid 08 Mid 09 Mid 10 Dive School 10 Jetty Low 05 Low 08 Aulacomya ater Mytilus galloprovincialis Balanus glandula High 10 Mid 05 Mid 08 North Bay Mid 09 Mid 10 Low 05 Low 08 Low 09 Low 10 Schaapen Low 09 Low 10 Low 09 Low 10 Low 09 Low 10 East Iron Ore Jetty State of the Bay 2010: Saldanha Bay and Langebaan Lagoon 214 12 8 12 6 10 8 4 6 2 4 0 2 0 80 70 60 50 40 30 20 10 0 High 05 High 08 High 09 High 05 High 08 High 09 High 05 High 08 High 09 High 10 Mid 05 Mid 08 Mid 09 Mid 10 Low 05 Low 08 Aulacomya ater Mytilus galloprovincialis Balanus glandula High 10 Mid 05 Mid 08 Mid 09 Mid 10 Low 05 Low 08 Aulacomya ater Mytilus galloprovincialis Balanus glandula High 10 Mid 05 Mid 08 Mid 09 Mid 10 Low 05 Low 08 Aulacomya ater Mytilus galloprovincialis Balanus glandula Low 09 Low 10 Low 09 Low 10 Low 09 Low 10 Figure 9.15. Mean percentage cover of the indigenous Aulacomya ater (green) and the aliens Mytilus galloprovincialis (red) and Balanus glandula (blue) at the eight study sites over the years. Note Aulacomya ater Aulacomya ater the difference in scale between the top and the bottom four graphs. Mytilus galloprovincialis Mytilus galloprovincialis Balanus glandula Balanus glandula 80 70 60 50 40 30 20 10 0 High 05 High 08 High 09 High 10 Mid 05 Mid 08 Schaapen West Mid 09 Mid 10 Lynch Point Marcus Island Low 05 Low 08 Low 09 Low 10
The temporal distribution of M. galloprovincialis at the study sites demonstrated the opposite pattern to that of the alien barnacle. The mussels’ presence had clearly declined from 2005 to 2009, which was noticeable at all semi-exposed to exposed sites, but most striking at Marcus Island in the low shore and Lynch Point in the mid shore (Figure 9.15). This decrease in alien mussel cover was accompanied by an increase in abundance of the local mussel Aulacomya ater. In 2010, however, M. galloprovincialis populations have recovered to similar or even higher values than before, whereas A. ater reduced to
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State of the Bay 2010: Saldanha Bay
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TABLE OF CONTENTS Anchor Environmen
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11 BIRDS 234 Anchor Environmental 1
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LIST OF FIGURES Anchor Environmenta
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Anchor Environmental Figure 4.27. O
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Anchor Environmental Figure 7.3. Ch
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Anchor Environmental Figure 9.10. C
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Anchor Environmental Figure 12.1. N
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Anchor Environmental samples were c
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EXECUTIVE SUMMARY Anchor Environmen
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Anchor Environmental matter in the
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Anchor Environmental considered mos
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Anchor Environmental again in 2004,
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Anchor Environmental Populations of
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GLOSSARY Alien species An introduce
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1 INTRODUCTION Anchor Environmental
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2 STRUCTURE OF THIS REPORT Anchor E
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Anchor Environmental complicates ma
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Anchor Environmental observed deter
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Anchor Environmental 4 ACTIVITIES A
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Fish factories Small craft harbour
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Anchor Environmental Aerial photogr
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Anchor Environmental interferes wit
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Anchor Environmental Figure 4.7. Nu
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o Decrease in oxygen concentrations
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Anchor Environmental Upgrades to th
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Anchor Environmental Figure 4.9. A)
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Anchor Environmental (possibly link
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Anchor Environmental Prestedge Reti
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Anchor Environmental the constructi
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Number and types of vessels enterin
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Anchor Environmental is contained b
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Anchor Environmental include the be
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o 33 3’S o 33 10’S Saldanha Bay
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Anchor Environmental (1956) UNDER T
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Free ACtive Chlorine (mg/l) Amonia
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Faecal coliforms (org/100 ml) Chemi
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4.3.7 Storm water Anchor Environmen
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Anchor Environmental sites (concent
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Anchor Environmental Discharges fro
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Anchor Environmental Table 4.9. Det
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5 WATER QUALITY Anchor Environmenta
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Anchor Environmental Stander (1977)
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Anchor Environmental coast, result
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Anchor Environmental likely as a re
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Anchor Environmental Construction o
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Anchor Environmental Table 5.2. Per
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Counts per 100ml of sample Counts p
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Counts per 100ml of sample 10000 10
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5.6 Trace Metal Contaminants in the
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Lead(mg/kg) Mercury (mg/kg) Cadmium
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6 SEDIMENTS 6.1 Sediment particle s
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6.1.2 Sediment Particle size result
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100% 90% 80% 70% 60% 50% 40% 30% 20
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% POC 18 16 14 12 10 8 6 4 2 0 % PO
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Percentage Percentage 1.8 1.6 1.4 1
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o 33 3’S o 33 10’S Yacht Club B
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Figure 6.12. Variation in the conce
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The concentrations of metals in sed
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concentrations are 56 and 29 times
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threshold of 1.2 mg/kg established
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Cadmium (mg/kg) 8 7 6 5 4 3 2 1 0 C
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Copper (mg/kg) 45 40 35 30 25 20 15
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16000 14000 12000 10000 8000 6000 4
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In summary, elevated trace metal co
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6.5 Summary of sediment health stat
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7.1 Long term changes in seagrass i
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7.2 Long term changes in Saltmarshe
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Figure 8.1. Benthic macrofauna samp
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Table 8.1. Depth at each of the sit
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these species usually provide the l
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(clustering of similar groups) (Meg
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The Big Bay samples BB 25 and BB29
Page 163 and 164: 2007/08 dredging. Other signs of th
Page 165 and 166: Wet mass per m² Wet mass per m² 4
Page 167 and 168: Big Bay Crustaceans and polychaetes
Page 169 and 170: Average number of individuals per m
Page 171 and 172: Number Individuals per m² Number I
Page 173 and 174: 8.4.2 Abundance Biomass Indices 8.4
Page 175 and 176: and percentage organic nitrogen (PO
Page 177 and 178: Table 8.5. W statistics at all stat
Page 179 and 180: Figure 8.15: Variation in the diver
Page 181 and 182: percentage of mud compared to Lange
Page 183 and 184: Cu (mg/kg) Cd (mg/kg) Ni (mg/kg) Pb
Page 185 and 186: contaminants. Furthermore dredging
Page 187 and 188: areas even 5 months after the clear
Page 189 and 190: Brittle star ( Ophiuroidea spp) Sea
Page 191 and 192: 9.2 Approach and Methodology 9.2.1
Page 193 and 194: cover data for both mobile and sess
Page 195 and 196: 9.2.3 Data Analysis The similaritie
Page 197 and 198: 40%, co-occurring with sponges espe
Page 199 and 200: stands of the kelp Ecklonia maxima
Page 201 and 202: Plocamium spp. Ecklonia maxima Scut
Page 203 and 204: 20 40 A Group 1 B 60 Similarity C G
Page 205 and 206: Percentage Cover 80 70 60 50 40 30
Page 207 and 208: Evenness Shannon Wiener 0.9 0.8 0.7
Page 209 and 210: 2005 2008 2009 2010 Dive School Jet
Page 211 and 212: Table 9.5. Results from the SIMPER
Page 213: In general, the inter-annual differ
Page 217 and 218: Consistent with the previous years,
Page 219 and 220: Saldanha and Langebaan. Results fro
Page 221 and 222: The average abundance of the four m
Page 223 and 224: State of the Bay 2010: Saldanha Bay
Page 225 and 226: State of the Bay 2010: Saldanha Bay
Page 227 and 228: Anchor Environmental Figure 10.5. A
Page 229 and 230: Anchor Environmental Figure 10.7. A
Page 231 and 232: Anchor Environmental Within Big Bay
Page 233 and 234: Anchor Environmental 2008 and 2009
Page 235 and 236: Anchor Environmental the islands, b
Page 237 and 238: Anchor Environmental at Saldanha ar
Page 239 and 240: their main prey species, sardines a
Page 241 and 242: Anchor Environmental 2009). The eff
Page 243 and 244: Anchor Environmental attributed to
Page 245 and 246: Number of breeding pairs 800 700 60
Page 247 and 248: 11.3 Birds of Langebaan Lagoon 11.3
Page 249 and 250: Anchor Environmental Figure 11.11.
Page 251 and 252: Anchor Environmental for the gannet
Page 253 and 254: Taxon Anchor Environmental Occurren
Page 255 and 256: Taxon Anchor Environmental Occurren
Page 257 and 258: Anchor Environmental 13 MANAGEMENT
Page 259 and 260: Anchor Environmental their operatio
Page 261 and 262: Anchor Environmental concentrations
Page 263 and 264: Anchor Environmental changes that p
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Anchor Environmental and slight imp
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Birdlife International. 2010. URL w
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Anchor Environmental penguins Sphen
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Anchor Environmental Game, E.T., Gr
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Anchor Environmental Kerwath, S. E.
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Anchor Environmental Moldan, A. 197
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Anchor Environmental Robinson, T.B.
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Anchor Environmental Tunley KL, Att
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State of the Bay Report 2010-Final - Anchor Environmental

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