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

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Average number of individuals per m² Proportion of total number of individuals Average wet mass per m² Proportion of total biomass State of Saldanha Bay & Langebaan Lagoon 2011 Benthic macrofauna 3000 2500 2000 1500 1000 1400 1200 1000 800 600 400 Polychaeta Crustacea Gastropoda Bivalvia Echinodermata 500 200 Pennatulacea (sea pen) 0 1999 2004 2008 2009 2010 2011 Small Bay 0 1999 2004 2008 2009 2010 2011 Small Bay Echiuroidea (Tongue worm) Other 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% 1999 2004 2008 2009 2010 2011 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% 1999 2004 2008 2009 2010 2011 SCAVENGER PREDATOR GRAZER FILTER FEEDER DETRITIVORE Small Bay Small Bay Figure 7.6. Overall trends in the biomass and abundance of benthic macrofauna in Small Bay as shown by taxonomic and functional groups. 144 ANCHOR e n v i r o n m en t a l
Proportion of total number of individuals Average number of individuals per m² Average wet mass per m² Proportion of total biomass State of Saldanha Bay & Langebaan Lagoon 2011 Benthic macrofauna 6000 5000 4000 3000 2000 1000 0 1999 2004 2008 2009 2010 2011 Big Bay 1000 900 800 700 600 500 400 300 200 100 0 1999 2004 2008 2009 2010 2011 Big Bay Polychaeta Crustacea Gastropoda Bivalvia Echinodermata Pennatulacea (sea pen) Echiuroidea (Tongue worm) Other 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% 1999 2004 2008 2009 2010 2011 Big Bay 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% 1999 2004 2008 2009 2010 2011 Big Bay SCAVENGER PREDATOR GRAZER FILTER FEEDER DETRITIVORE Figure 7.7. Overall trends in the biomass and abundance of benthic macrofauna in Big Bay as shown by taxonomic and functional groups. 145 ANCHOR e n v i r o n m en t a l
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Saldanha Bay and Langebaan Lagoon:
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State of Saldanha Bay & Langebaan L
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Jul-05 Sep-05 Nov-05 Jan-06 Mar-06
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Average Daily Flow (m3/day) Apr-03
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Average daily flow (m 3 /day) Faeca
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Ammonia Nitrogen (mg/l as N) Nitrat
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Volume of Effluent (kL) Jan-01 Mar-
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Mussels Oysters Abalone Scallops Re
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Cadmium (mg/kg) Lead(mg/kg) Mercury
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Beach Width (m) State of Saldanha B
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Number of species State of Saldanha
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Fish abundance (No.m -2 ) State of
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Number of breeding pairs State of S
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Number of birds 1976 1977 1978 1979
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No. sites Abundance (no. ind. m -2
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