Benthic community ecology for Algerian river Seybouse

Area of Science:

• Environmental Science
• Ecology
• Aquatic Biology

Background:

• The Seybouse River basin in Algeria is vital for biodiversity and ecosystem services.
• Agricultural and industrial activities pose significant threats to the river's ecosystem integrity.
• Benthic macroinvertebrates are established biological indicators for river quality, yet understudied in North Africa.

Purpose of the Study:

• To inventory benthic macroinvertebrates in the Seybouse River and its tributaries.
• To assess the ecological role of these invertebrates.
• To determine the impact of pollution on their distribution.

Main Methods:

• Conducted regular surveys of benthic macrofauna at three sites in the Seybouse River basin.
• Measured 10 key physico-chemical parameters (pH, EC, OD, water speed, NO3, Salinity, NO2, MES, turbidity, depth).
• Analyzed macroinvertebrate populations and applied organic pollution indices.

Main Results:

• Identified 7482 individuals belonging to 40 taxa, with Crustaceans being the most dominant group.
• Insects (Ephemeroptera, Diptera, Trichoptera, Heteroptera, Odonata), Molluscs, Nematodes, and Annelids were also identified.
• Physico-chemical analyses and pollution indices indicated strong to excessive organic pollution across all sites, particularly upstream.

Conclusions:

• Benthic macroinvertebrate communities in the Seybouse River are significantly impacted by pollution.
• The study highlights the urgent need for pollution control measures to protect the river's biodiversity and ecosystem services.
• This research provides crucial baseline data for future ecological assessments of North African river systems.