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

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State of Saldanha Bay & Langebaan Lagoon 2011 List of Tables Table 5.4. Table 5.5. Table 5.6. Table 5.7. Table 5.8. Table 6.1. Table 6.2. Sampling site compliance (based on faecal coliform counts) for 10 sites in Small Bay, 5 sites in Big Bay and 3 sites in Langebaan Lagoon. Average faecal coliform concentration of samples calculated within the 80th percentile limit specified in South African Water Quality Guidelines for mariculture use (20 organisms/100 ml) for 18 sites. Numbers in black indicate compliance with regulations, while red numbers indicate non-compliance. “ND” indicates that no samples were collected in that year. (Source: Saldanha Bay Water Quality Forum Trust). .................................. 64 Sampling site compliance (based on faecal coliform counts) for 10 sites in Small Bay, 5 sites in Big Bay and 3 sites in Langebaan Lagoon. Average faecal coliform concentration of samples calculated within the 95th percentile limit specified in South African Water Quality Guidelines for mariculture use (60 organisms/100 ml) for 18 sites. Numbers in black indicate compliance with regulations, while red numbers indicate non-compliance. “ND” indicates that no samples were collected in that year. (Source: Saldanha Bay Water Quality Forum Trust). .................................. 65 Target limits for Enterococci and E. coli based on revised final guidelines for recreational waters of South Africa’s coastal marine environment (RSADEA 2011) .. 72 Sampling site compliance (based on E. coli counts) for 10 sites in Small Bay, 5 sites in Big Bay and 5 sites in Langebaan Lagoon. Ratings are calculated using Hazen percentiles, (with the 90 th and 95 th percentile results being grouped together to give an overall rating per annum. “ID” indicates that samples were collected that year, but there were insufficient data to allow calculation of Hazen percentiles. “-” indicates that no data were collected in that year. .................................................... 74 Regulations relating to maximum levels for metals in molluscs in different countries ..................................................................................................................................... 77 Particle size composition and percentage organic carbon and nitrogen in surface sediments collected from Small Bay (SB), Big Bay (BB), Langebaan Lagoon (LL), Salamander Bay (S) and Donkergat (D) in 2011. (Particle size and TOC analysed by Scientific Services, TON analysed by CSIR). *The loss on ignition method was used to estimate TOC. These are not comparable to previous years where a CHN analyzer was used. ..................................................................................................................... 96 Summary of BCLME and NOAA metal concentrations in sediment quality guidelines ................................................................................................................................... 104 Table 6.3. Concentrations (mg/kg) of metals in sediments collected from Saldanha Bay in 2011. ................................................................................................................................... 106 Table 6.4. Enrichment factors for Cadmium, Copper and Lead in sediments collected from Saldanha Bay in 2009 relative to sediments from 1980 ........................................... 108 Table 8.1. Depth at each of the sites sampled in 2011. ............................................................. 131 Table 8.2. Table 8.3. Table 9.1. Top ten species characterising the benthic macrofaunal communities in Small Bay, Salamander Bay and Donkergat in 2011. .................................................................. 139 Top ten species characterising the benthic macrofaunal communities in Central Big Bay and Langebaan Lagoon in 2011. ......................................................................... 140 PERMANOVA pairwise-testing results following significant main-tests. Only the relevant pairwise comparisons for the years 2005 vs 2008, 2008 vs 2009, 2009 vs 2010, and 2010 vs 2011 per site are shown. Significant (p < 0.05) differences are highlighted in italic. Number of permutations are 462 for all pairwise comparisons. Percent similarity among the years tested are also provided. ................................. 186 xvi ANCHOR e n v i r o n m en t a l
State of Saldanha Bay & Langebaan Lagoon 2011 List of Tables Table 9.2. Table 10.1 Table 10.2 Table 10.3. Table 10.4. Table 10.5. Table 11.1. Table 12.1. SIMPER results listing the species that contribute >5% to the dissimilarity between 2010 and 2011 at each site. The % cover data are averages across the six replicates per site, and are on the fourth-root transformed scale. ........................................... 187 Average abundance of fish species (number.m -2 ) recorded during annual beach seine-net surveys in Small Bay Saldanha. (Ave. = average, SE = standard error). Species not previously recorded are shown in bold font. ......................................... 199 Average abundance of fish species (number.m -2 ) recorded during annual beach seine-net surveys in Big Bay Saldanha SE = standard error. .................................... 200 Average abundance of fish species (number.m -2 ) recorded during annual beach seine-net surveys in Langebaan Lagoon. SE = standard error.................................. 201 Results of the multivariate PERMANOVA pairwise tests between Small Bay fish samples collected in different years. NS: not significant, *: P < 0/05, **: P < 0.01 .. 209 Results of the multivariate PERMANOVA pairwise tests between Langebaan lagoon fish samples collected in different years. NS: not significant, *: P < 0/05, **: P < 0.01 . ........................................................................................................................ 211 Taxonomic composition of waterbirds in Langebaan Lagoon (excluding rare or vagrant species)......................................................................................................... 231 List of introduced and cryptogenic species from Saldanha Bay-Langebaan Lagoon. Occurrence is listed as confirmed or likely (not confirmed from the Bay but inferred from their distribution in the region). Region of origin and likely vector for introduction (SB = ship boring, SF = ship fouling, BW = ballast water, BS = solid ballast, OR = oil rigs, M = mariculture, F = Fisheries activities, I = intentional release) are also listed. (Data from Mead et al. 2011 a & b) .................................................. 235 xvii ANCHOR e n v i r o n m en t a l
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