State of the Bay Report 2011-Final.pdf - Anchor Environmental

State of Saldanha Bay & Langebaan Lagoon 2011
List of Figures
Figure 8.10.
Figure 8.11.
Figure 8.12.
Figure 8.13.
Figure 8.14.
Figure 8.15.
Figure 8.16.
Average Shannon Weiner diversity indices (H’) (± 0.95 confidence intervals) for Big
Bay, Small Bay and Langebaan Lagoon in 1999, 2004, 2008, 2009, 2010 and 2011.
149
Two-dimensional PCA ordination of the environmental variables (metals, POC and
PON; transformed and normalized) for Saldanha Bay 2010. Sites are labelled
according to significant groupings revealed by the SIMPROF analysis. ................. 150
MDS of Saldanha Bay and Langebaan Lagoon benthic macrofauna abundance
(2011) with superimposed circles representing depth (Increasing circle size =
deeper) ................................................................................................................... 151
MDS plot of Saldanha Bay and Langebaan Lagoon benthic macrofauna abundance
(2011) with superimposed circles representing abiotic factors: Total Organic
Carbon (TOC), and % Mud (Increasing circle size = larger measurement). ............ 152
MDS of Saldanha Bay benthic macrofauna abundance (2011) with superimposed
circles representing concentrations of select metals: Cu, Cd, Pb and Ni. Circle size is
proportional to magnitude of concentration (increasing circle size = larger
concentration) ........................................................................................................ 152
Benthic macrofauna species frequently found to occur in Saldanha Bay and
Langebaan Lagoon, photographs by: Nina Steffani. ............................................... 160
Benthic macrofauna species frequently found to occur in Saldanha Bay and
Langebaan Lagoon, photographs by: Charles Griffiths. .......................................... 161
Figure 9.1, Location of the eight rocky shore study sites in Saldanha Bay. .............................. 163
Figure 9.2.
Figure 9.3.
Figure 9.4.
Figure 9.5.
Figure 9.6.
Figure 9.7.
Rocky shore study sites in Saldanha Bay (top right to left bottom): Dive School,
Jetty, Schaapen Island East, and Schaapen Island West......................................... 164
Rocky shore study sites in 2010 (top right to bottom left): Iron Ore Terminal, Lynch
Point, North Bay, and Marcus Island. ..................................................................... 165
From top left clockwise: High shore at Dive School showing Oxystele variegata and
sand/gravel accumulation among the boulders; high shore at North Bay showing
the Afrolittorina knysnaensis on rock and accumulating in crevices; blue-green
algae patch at Schaapen East high shore; and low growing Ulva carpet with
Porphyra capensis tufts at the high shore at Marcus Island. See text for more
information. ............................................................................................................ 169
From top left clockwise: Ulva-Balanus band at the mid shore at Schaapen Island
East; the sand-tubeworm compact mixture at Schaapen Island West with Ulva;
dense Balanus glandula cover at Iron Ore Terminal; and Mytilus patches
interspersed with Balanus and Scutellastra granularis patches at Marcus Island.
See text for more information. ............................................................................... 170
From top to bottom right: Parechinus angulosus and Pseudoactinia flagellifera in
the low shore pool at Dive School; overview of low shore at Schaapen Island East;
close-up of tube-building polychaete emerging from sand; the sea cucumber
Pseudocnella insolens embedded in sand; overview of low shore at Iron Ore
Terminal; and close up of the giant barnacle Austromegabalanus cylindricus. See
text for more information. ..................................................................................... 172
From top left clockwise: Scutellastra cochlear patch in association with ‘pink’
encrusting coralline algae on a low shore boulder at Lynch Point; overview of the
low shore at North Bay showing kelp growing in the infratidal; Aulacomya ater
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