Beasley Lake was assessed monthly in 2005 for biological impairment from 17 historic and current-use pesticides in water and leaf litter using Hyalella azteca (Saussure). Sixteen pesticides were detected in both water and leaf litter with peak detections in spring and summer. Detections ranged from 1–125 ng L−1 in water and 1–539 ng g−1 OC in leaf litter. Ten-day H. azteca survival and growth (mg dw) bioassay results indicated no adverse effects on survival or growth in H. azteca exposed to water or leaf litter. Rather, enhanced growth occurred in both lake water and leaf litter exposures for 8 and 6 months, respectively.
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Appreciation is extended to S. Smith, C. Bryant, V. Campbell, D. McChesney, L. Brooks, A. Delmastro, and L. Arbuckle for analytical assistance as well as C. Bryant and M. Haasch for reviewing an earlier version of the manuscript. Mention of equipment, software or a pesticide does not constitute an endorsement for use by the US Department of Agriculture nor does it imply pesticide registration under FIFRA as amended. All programs and services of the USDA are offered on a nondiscriminatory basis without regard to race, color, national origin, religion, sex, marital status, or handicap.
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Lizotte, R.E., Knight, S.S. & Cooper, C.M. Toxicity Evaluation of a Conservation Effects Assessment Program Watershed, Beasley Lake, in the Mississippi Delta, USA. Bull Environ Contam Toxicol 84, 422–426 (2010). https://doi.org/10.1007/s00128-010-9951-x
- Lake water
- Leaf litter
- Hyalella azteca