Abstract
The assessment of ecological integrity of river systems is multidisciplinary and necessary for effective river management. The objectives of this study were (i) to characterize the spatial and temporal distribution of macroinvertebrate and algae community assemblages; (ii) to determine the environmental variables that affect assemblage distributions; and (iii) to determine the suitability of the selected bioindicators in relation to environmental conditions. Two agriculturally influenced coastal rivers, in the southern Cape Province, South Africa, provided case studies. Wet and dry season’s results indicated that minimally impacted sites were associated with pollution-sensitive macroinvertebrate and algal taxa with increased habitat scores. These sites were dominated by diatoms and macroinvertebrates indicative of low electrical conductivity (12–16 mS m−1), pH (4–5), and alkalinity (0.5–2.1 mg l−1). A positive correlation between nitrogen and phosphorus and river flow regime occurred at agriculturally impacted sites and algal taxa changes were driven by nutrient enrichment. Macroinvertebrates were indicative of habitat integrity and river condition while diatoms were indicative of pH and electrical conductivity. The benthic filamentous algae were indicative of increased nutrients and alkalinity. Results suggest that the full consortium of algae and macroinvertebrates be used as bioindicators for ecological integrity assessments in short, coastal rivers, which have application to rivers generally.
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Acknowledgments
The authors acknowledge financial support from the CSIR’s Parliamentary Grant funding (Project Number ECRS002), National Research Foundation (Grant Number: 84209), the Department of Science and Technology (DST) (Project Number ECRS005), and the Water Research Commission (WRC) (2013–2016). Thanks to colleagues at the CSIR for assisting with fieldwork and for valuable comments on earlier drafts. We also want to thank the landowners in the Wilderness area for their support. The authors want to thank the anonymous referees for critically reviewing the manuscript and suggesting changes. Data may be obtained from the CSIR Research Space data repository (https://researchspace.csir.co.za/dspace/handle/10204/8989). Any additional data may be obtained from the corresponding author.
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Petersen, C.R., Jovanovic, N.Z., Grenfell, M.C. et al. Responses of aquatic communities to physical and chemical parameters in agriculturally impacted coastal river systems. Hydrobiologia 813, 157–175 (2018). https://doi.org/10.1007/s10750-018-3518-y
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DOI: https://doi.org/10.1007/s10750-018-3518-y
Keywords
- Ecological integrity
- Benthic algae
- Macroinvertebrates
- Land use
- Water quality