Nematode morphometry and biomass in the Saigon River harbours in relation to antifouling contaminants

in Nematology
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Morphometry and biomass of nematode communities in different harbours of the Saigon River were investigated in the dry and wet seasons in relation to environmental variables such as total organic carbon, pH, conductivity, salinity and oxygen redox potential, in addition to concentrations of different butyltin compounds. The results indicated that nematodes in contaminated sediments from the Saigon River harbours were mainly characterised by slender morphotypes, whilst very few thin and stout nematodes were observed. Individual nematode biomass was generally low, especially in the wet season. There was no significant correlation between butyltin compounds and nematode morphometrics in the dry season but significant correlations were found for the wet season. Although significant correlations were observed for the wet season, the strong seasonal differences in nematode biomass spectra suggest a potential limitation in their use for environmental monitoring.

Nematode morphometry and biomass in the Saigon River harbours in relation to antifouling contaminants

in Nematology



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    Map of sampling stations in the Saigon River, Vietnam.

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    Principal Component Analysis based on normalised environmental variables for all stations in dry season (D) and wet season (W). MBT = monobutyltin; DBT = dibutyltin; TBT = tributyltin; TOC = total organic carbon; ORP = oxygen redox potential.

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    Length (x-axis) and width (y-axis) scatter plots for all measured nematodes in the Saigon River harbours in the dry and wet seasons.

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    Nematode gender structure showing the proportions of juveniles (J), males (M) and females (F) for 12 stations (SG1-SG12) sampled in the dry (D) and wet (W) seasons. The table shows the results of the PERMANOVA pairwise comparisons. Each time the interaction was significant, comparisons are shown of seasons within stations (∗ = significant differences P<0.05) and of stations within each of the seasons (stations that differ from the station as indicated in the first row are listed). The last line presents the number of measured individuals for each site during dry and wet seasons.

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    Geometric mean and standard deviation of nematode individual biomass (μg 10 cm−2) for 12 stations (SG1-SG12) sampled in the dry (D) and wet (W) seasons. The table shows the results of the PERMANOVA pairwise comparisons as described in Figure 4.

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    Nematode biomass spectra (mean and standard deviation) for all stations sampled in the dry (D) and wet (W) seasons. The table shows the results of the PERMANOVA pairwise comparisons as described in Figure 4.

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