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Values are approximate number of individuals associated with the oil rig with minimum and maximum size (TL [total length] cm) in parenthese doi:10.1371/journal.pone.0103709.t005 Table 5. Estimates of abundance and sizes of large schooling resource species associated with oil rigs in Gabon

Table 5 Values are approximate number of individuals associated with the oil rig with minimum and maximum size (TL [total length] cm) in parenthese doi:10.1371/journal.pone.0103709.t005 Table 5. Estimates of abundance and sizes of large schooling resource species associated with oil rigs in Gabon

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The mean is the percentage of the sub-quadrats were the taxa was observed. % freq. is the percentage of platforms upon which this taxon was observed (n= 10). doi:10.1371/journal.pone.0103709.t002 Table 2. Percent occurrence of major taxa found on oil platforms in Gabon.
The mean is the percentage of the sub-quadrats were the taxa was observed. % freq. is the percentage of platforms upon which this taxon was observed (n= 10). doi:10.1371/journal.pone.0103709.t002 Table 2. Percent occurrence of major taxa found on oil platforms in Gabon.
Figure 2. Benthic taxa on transects associated with oil platforms in Gabon, West Africa. Values are mean percent presence and standard error of the mean. doi:10.1371/journal.pone.0103709.g002
Figure 2. Benthic taxa on transects associated with oil platforms in Gabon, West Africa. Values are mean percent presence and standard error of the mean. doi:10.1371/journal.pone.0103709.g002
Figure 4. Comparisons of trophic (a) biomass (t ha") and (b) abundance (no. m 2) at oil platforms in Gabon. Values are means and standard error. Kruskal-Wallis Rank Sum comparisons among trophic groups were statistically different for biomass (H=12.3, p=0.007) and abundance (H=35.3, p<0.001). Trophic groups with the same letter are not significantly different (Dunn’s unplanned multiple comparisons procedures, «=0.05). doi:10.1371/iournal.oone.0103709.a004
Figure 4. Comparisons of trophic (a) biomass (t ha") and (b) abundance (no. m 2) at oil platforms in Gabon. Values are means and standard error. Kruskal-Wallis Rank Sum comparisons among trophic groups were statistically different for biomass (H=12.3, p=0.007) and abundance (H=35.3, p<0.001). Trophic groups with the same letter are not significantly different (Dunn’s unplanned multiple comparisons procedures, «=0.05). doi:10.1371/iournal.oone.0103709.a004
Values are means and one standard deviation. Trophic groups - Plank = planktivores, Herb = herbivores, Pisc = piscivores, Invert = invertivores. Distributions derivec from [82,83]. % is the percent contribution of each species to total fish biomass. doi:10.1371/journal.pone.0103709.t003 Table 3. Biomass (g m ”) of the top ten species observed on quantitative transects on oil platforms in Gabon, West Africa.
Values are means and one standard deviation. Trophic groups - Plank = planktivores, Herb = herbivores, Pisc = piscivores, Invert = invertivores. Distributions derivec from [82,83]. % is the percent contribution of each species to total fish biomass. doi:10.1371/journal.pone.0103709.t003 Table 3. Biomass (g m ”) of the top ten species observed on quantitative transects on oil platforms in Gabon, West Africa.
Values are means and one standard deviation. Trophic groups - Plank = planktivores, Herb = herbivores, Pisc = piscivores, Invert = invertivores. Distributions derive from [82,83]. % is the percent contribution of each species to total fish abundance. doi:10.1371/journal.pone.0103709.t004 Table 4. Numerical abundance (no. m-2) of the top ten species observed on quantitative transects on oil platforms in Gabon West Africa.
Values are means and one standard deviation. Trophic groups - Plank = planktivores, Herb = herbivores, Pisc = piscivores, Invert = invertivores. Distributions derive from [82,83]. % is the percent contribution of each species to total fish abundance. doi:10.1371/journal.pone.0103709.t004 Table 4. Numerical abundance (no. m-2) of the top ten species observed on quantitative transects on oil platforms in Gabon West Africa.
Figure 5. Biplot of results of redundancy analysis on biological (biomass of fish trophic groups and higher order benthic groups [e.g, Red alga, Sponge, Cnidaria-Anthozoa, Cnidaria-Hydrozoa, Crustacea-Cirripedia, Mollusca-Bivalve) and environmental data (e.g., age of platform, platform area). doi:10.1371/journal.pone.0103709.g005
Figure 5. Biplot of results of redundancy analysis on biological (biomass of fish trophic groups and higher order benthic groups [e.g, Red alga, Sponge, Cnidaria-Anthozoa, Cnidaria-Hydrozoa, Crustacea-Cirripedia, Mollusca-Bivalve) and environmental data (e.g., age of platform, platform area). doi:10.1371/journal.pone.0103709.g005
FG = functional groups. doi:10.1371/journal.pone.0103709.t006 Table 6. Results of redundancy analysis (RDA) on log-transformed data on fish biomass of trophic groups and abundance of higher-level benthic groups with environmental variables (e.g., age of platform, distance offshore, latitude, platform area).
FG = functional groups. doi:10.1371/journal.pone.0103709.t006 Table 6. Results of redundancy analysis (RDA) on log-transformed data on fish biomass of trophic groups and abundance of higher-level benthic groups with environmental variables (e.g., age of platform, distance offshore, latitude, platform area).
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