HR: 1330h
AN: NB33R-04    [Abstracts]
TI: Storm Induced Changes in Turbidity, Chlorophyll, and Rotifer Abundance in Acton Lake, Ohio
AU: * Noble, S J
EM: sn1051@txstate.edu
AF: Biology Department-Aquatic Station-Texas State University, 601 University Dr. Freeman Aquatic Building , San Marcos, TX 78666 United States
AU: Arsuffi, T L
EM: ta04@txstate.edu
AF: Biology Department-Aquatic Station-Texas State University, 601 University Dr. Freeman Aquatic Building , San Marcos, TX 78666 United States
AB: Storms are natural disturbances that can alter several processes in lakes. However, the magnitude of the disturbance caused by storms in reservoirs may be unnaturally large due to land use practices within the watershed. Daily to weekly limnological sampling was conducted during spring and summer 2001-2003 and changes in turbidity (measured as non-volatile suspended solids, NVSS) and algal biomass (measured as chlorophyll a) as well as rotifer abundance was analyzed. Storms varied in both magnitude of peak discharge and frequency. During storms in which daily samples were taken, changes in turbidity were strongly correlated to storm intensity. Overall, turbidity was higher during periods of increased discharge than during periods exhibiting base flow or near base flow conditions. Chlorophyll levels decreased in association with storms due to increased turbidity and discharge. In general, chlorophyll levels were highest during the periods between storm events. The response of rotifer abundance seemed to be related to both magnitude of peak discharge and frequency of storm events, with high frequency and discharge causing decreases in abundance and low frequency or discharge causing increases in abundance. Overall, however, rotifer abundance was greater during calm periods.
DE: 1845 Limnology
DE: 1857 Reservoirs (surface)
DE: 9901 NABS Student Award - Basic Research
SC: North American Benthological Society [NB]
MN: 2005 Joint Assembly