Assessment of stream quality using biological indices at selected sites in the Red Clay and White Clay Creek basins, Chester County, Pennsylvania, 1981-97

Daily stream samples reveal highly complex pesticide occurrence and potential toxicity to aquatic life

“…intolerant of degraded water quality and sensitive to pesticides (Liess and von der Ohe, 2005;Rasmussen et al, 2012;Reif, 2002). EPT richness was significantly and inversely related to the percentage of days at each site with PTI ≥ 0.1 (r 2 = 0.44, p = 0.01) ( Fig.…”

Pesticide Pollution Associations with Riverine Invertebrate Communities in England

“…High BOD concentrations can indicate reduced oxygen availability and this negatively impacts riverine invertebrate communities and causes declines in taxa richness (Vigiak et al, 2019). Similarly high ammonia concentrations often coincide with reduced taxa richness (Reif, 2002).…”

“…In turn potentially this can result in overestimates of pesticide (insecticide) pressure at a given site (Bunzel et al, 2013;Malherbe et al, 2018;van der Lee et al, 2020). It is well established that some pesticide sensitive species include species that are also sensitive to general pollution, and other factors including temperature, pH, turbidity etc., notably species belonging to the Ephemeroptera, Plecoptera and Trichoptera (Lydy et al, 2000;Reif, 2002;Weijters et al, 2009;Ippolito et al, 2012;Suhaila and Che Salmah, 2017). Thus, it was no surprise that ammonia and BOD concentrations a negative relationship with SPEAR pesticides scores (see Fig.…”