State of the Bay Report 2010-Final - Anchor Environmental
State of the Bay Report 2010-Final - Anchor Environmental
State of the Bay Report 2010-Final - Anchor Environmental
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Total no species (S)<br />
Species richness (d)<br />
28<br />
26<br />
24<br />
22<br />
20<br />
18<br />
16<br />
14<br />
12<br />
4.4<br />
4.2<br />
4.0<br />
3.8<br />
3.6<br />
3.4<br />
3.2<br />
3.0<br />
2.8<br />
2.6<br />
2.4<br />
2.2<br />
Site; LS Means<br />
Current effect: F(2, 22)=.52297, p=.59994<br />
Effective hypo<strong>the</strong>sis decomposition<br />
Vertical bars denote 0.95 confidence intervals<br />
Site; LS Means<br />
SB Current effect: F(2, 22)=1.0900, BB p=.35369 LL<br />
Effective hypo<strong>the</strong>sis decomposition<br />
Vertical bars denote 0.95 Site confidence intervals<br />
SB BB LL<br />
Site<br />
Site; LS Means<br />
SB Current effect: F(2, 22)=3.5247, BB p=.04700 LL<br />
Effective hypo<strong>the</strong>sis decomposition<br />
Site<br />
Vertical bars denote 0.95 confidence intervals<br />
SB BB LL<br />
<strong>State</strong> <strong>of</strong> <strong>the</strong> <strong>Bay</strong> <strong>2010</strong>: Saldanha <strong>Bay</strong> and Langebaan Lagoon 178<br />
Eveness (J')<br />
0.9<br />
0.8<br />
0.7<br />
0.6<br />
0.5<br />
0.4<br />
0.3<br />
Site; LS Means<br />
Current effect: F(2, 22)=6.6612, p=.00547<br />
Effective hypo<strong>the</strong>sis decomposition<br />
Vertical bars denote 0.95 confidence intervals<br />
Figure 8.14. Mean (± 0.95 confidence intervals) Species diversity (H'), Species richness (d'), Evenness (J')<br />
and Total number <strong>of</strong> species (S) for benthic macr<strong>of</strong>auna samples collected from Small <strong>Bay</strong> (SB),<br />
Big <strong>Bay</strong> (BB) and Langebaan Lagoon (LL), Saldanha, <strong>2010</strong>.<br />
The diversity <strong>of</strong> benthic macr<strong>of</strong>auna recorded in <strong>2010</strong> in <strong>the</strong> lagoon appeared patchy, with<br />
moderate levels <strong>of</strong> diversity at most sites and low levels <strong>of</strong> diversity at sites LL39 and LL41. The W<br />
statistic was also lowest at sites LL39 and LL41 compared to o<strong>the</strong>r sites in <strong>the</strong> lagoon. The low<br />
diversity value is most likely a consequence <strong>of</strong> natural disturbance due to <strong>the</strong> fact that Langebaan<br />
Lagoon is very shallow and is subjected to strong currents and tidal activity.<br />
8.4.3.2 Temporal Analysis<br />
Species Diversity (H’) within Small <strong>Bay</strong>, decreased significantly between 1999 and 2008<br />
(p
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