Total Suspended Solids Effects on Freshwater Lake Biota Other than Fish

Area of Science:

• Environmental Science
• Aquatic Ecology
• Ecotoxicology

Background:

• Protective benchmarks for total suspended solids (TSS) in freshwater primarily target fish.
• Uncertainty exists regarding the protection of lower trophic levels and prey species by these fish-centric benchmarks.
• Lake food webs rely on diverse organisms, including phytoplankton, zooplankton, periphyton, and benthic invertebrates.

Purpose of the Study:

• To evaluate if existing TSS benchmarks protect the entire food web of lake ecosystems.
• To assess the impact of TSS on various aquatic biota, including phytoplankton, zooplankton, periphyton, and benthic invertebrates.
• To determine if TSS benchmarks safeguarding fish also protect their supporting food webs.

Main Methods:

• Extensive literature review of existing studies on TSS effects.
• Analysis of data on TSS impacts across different trophic levels in lake ecosystems.
• Synthesis of findings to assess the protective capacity of current TSS benchmarks for overall aquatic community function.

Main Results:

• The available scientific literature indicates that TSS benchmarks designed to protect sensitive fish life stages also protect their supporting food webs.
• Organisms such as phytoplankton, zooplankton, periphyton, and benthic invertebrates are adequately protected by fish-focused TSS benchmarks.
• Current TSS benchmarks are sufficient to maintain the functional integrity of lake aquatic communities.

Conclusions:

• Protective benchmarks for total suspended solids (TSS) that safeguard fish also ensure the protection of the entire lake food web.
• The function and health of lake aquatic communities are maintained when TSS levels are regulated to protect fish.
• Existing TSS benchmarks are effective in protecting freshwater aquatic biota across all trophic levels.