Which factor primarily contributes to increased turbidity?

Increased turbidity in water is primarily influenced by the presence of suspended sediment particles such as clay and silt. These particles can be introduced into the water column through various processes, including erosion, runoff from land, and disturbances in the aquatic environment. When these fine particles are present in the water, they scatter light, making the water appear cloudy or murky, which is the definition of turbidity.

High temperatures, while they can affect other physical and biological processes within a waterbody, are not a direct contributor to turbidity. Water salinity affects the density and mixing of water but does not significantly influence turbidity levels. The presence of microorganisms can affect water quality and clarity, but they are not typically the primary contributors to turbidity compared to suspended sediment particles like clay and silt. Therefore, the correct factor leading to increased turbidity is the presence of these suspended sediment particles.