INVESTIGATION OF OPEN LAKE AND WETLAND CORES TO DETERMINE RELATIVE LAKE LEVEL CHANGE IN SENECA LAKE, NEW YORK
Failure of the vibra-core core catcher prevented us from recovering the bottom 4 m of the 8.3 m of sediment penetrated in the wetland. In the 4.3 meters collected there is a striking change in the weight percent carbonate and MS observed in each core, which can be used to correlate between the lake and wetland area. Microfossils in the wetland cores provide a means of estimating water depth. The presence of oogonia (reproductive structures of the aquatic macroalgae Chara) and an abundance of Candona spp. ostracodes in the lower section of the core indicate open fresh water with a depth of less than 5 m. Increasing sand content followed by increasing organic material up-core indicate shallowing and eutrophication.