Abstract
Macrobenthic community responses can be measured through concerted changes in univariate metrics,including species richness, total abundance, and totalbiomass. The classic model of pollution effects onmarine macrobenthic communities recognizes thatspecies/abundance/biomass (SAB) curves varydistinctively in a nonlinear manner with the magnitudeof organic enrichment. For example, at moderatelevels of organic enrichment, small-bodiedopportunistic species boost the abundance curve, whilespecies richness falls. Ratios among the metrics formuseful indicators of how the community changes withorganic enrichment. However, the classic SAB model isbased on organic enrichment effects over small spatialand temporal scales, and the applicability of the SABmodel to sediment chemical contamination and acrossbroad natural estuarine gradients is largely unknown. Here, SAB responses were examined with respect toprimary gradients in metals and organic chemicalsbased on an extensive dataset comprising 319 estuarinesites from throughout the northern Gulf of Mexico. Each SAB metric was first adjusted with respect to thethree primary natural estuarine gradients, salinity,depth, and sediment silt/clay content. Adjusted SABrelationships varied in their details with respect todifferent classes of sediment contamination, but alltypes of SAB stress responses appear to exhibitsimilar basic characteristics. As in the SAB model,all three SAB metrics were notably low at the highestconcentrations of both metal and organic-chemicalcontaminants. Moreover, rapid decreases in the B/Aratio with increasing contamination supported theconcept that relatively long-lived, large-bodied,equilibrium taxa decline markedly at highconcentrations of toxicants.
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Rakocinski, C.F., Brown, S.S., Gaston, G.R. et al. Species-abundance-biomass responses by estuarine macrobenthos to sediment chemical contamination. Journal of Aquatic Ecosystem Stress and Recovery 7, 201–214 (2000). https://doi.org/10.1023/A:1009931721009
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DOI: https://doi.org/10.1023/A:1009931721009