eNews

#04 2026

Standardizing River Monitoring Across Lowveld’s Major Catchments

By Tsumbedzo Ramalevha, EFTEON Biodiversity Technician

Rivers know no borders. The waters flowing through the iconic Kruger National Park (KNP) carry the ecological signature of every agricultural field, village, and development upstream. To protect these vital lifelines, understanding catchment health cannot stop at a park fence – it demands unified science, shared tools, and cross-institutional collaboration.

During 06 to 17 September 2026, SAEON EFTEON biodiversity technician Tsumbedzo Ramalevha joined expert teams across the Lowveld to bridge these gaps. Shadowing specialists from partner organisations—including SANParks, DWS, SANBI, SAAIB, and the University of Mpumalanga—this collaborative effort focused on standardising technical protocols to prepare for EFTEON’s upcoming baseline sampling campaign across the Sabie, Sand, and Crocodile River catchments.

Key Highlights from the Field

  • Catchment-Wide Habitat & Canopy Integrity: Evaluated riparian canopy coverage, bank stability, channel morphology, and invasive plant encroachment alongside Department of Water and Sanitation (DWS) specialists to understand how physical habitats shape aquatic life.

Figure 1: Riparian vegetation sampling (left) and macroinvertebrate identification (right).

  • Bio-Indicators & Microscopic Signals: Mastered South African Scoring System Version 5 (SASS5) protocol execution and quantitative Surber sampling for riverbed macroinvertebrates, alongside toothbrush-harvesting epilithic diatoms (micro-algal biofilms) from submerged cobbles to decode nutrient dynamics.
  • Cutting-Edge Genetic & Fish Surveys: Applied Environmental DNA (eDNA) field filtration methods using syringe-mounted $0.45\ \mu\text{m}$ membrane filters for molecular metabarcoding. Joined SANParks and North-West University (NWU) specialists in backpack electrofishing operations—safely stunning, identifying, measuring, and releasing fish back into their natural habitats.

Figure 2: Electrofishing (left) and diatom sampling (right).

  • Unifying Data Across Boundaries: Partner institutions confirmed a strong demand for EFTEON’s planned long-term monitoring outside the national park boundaries, which will provide the missing puzzle pieces needed to manage entire river catchments holistically.

The Bigger Picture: Why This Data Matters

Long-term ecological research relies entirely on comparability. By aligning EFTEON’s future sampling points such as those along the Sabie, Sand, and Crocodile rivers—with SANParks’ ongoing monitoring radii, researchers can track water quality changes, aquatic biodiversity shifts, and nitrate dynamics seamlessly across protected and non-protected boundaries.