ANALYSIS OF INSECT OCCURRENCE IN GROUNDWATER IN A COASTAL LAKE MICHIGAN AQUIFER
This presentation reports on attempts to correlate F. candida occurrence and abundance with general ground water parameters such as temperature, pH, major element chemistry, dissolved oxygen, and depth below grade. Soil texture, grain size and shape, organic content, pH and color were also documented. Data collected in November, February and June have yielded preliminary results, including: (1) F. candida generally occur in the same wells throughout the year, and are absent in the same wells throughout the year; (2) F. candida are completely absent in the overlying vadose zone regardless of soil type, based on multiple soil borings/profiles; (3) F. candida are most abundant at a depth of 4.5- 4.9 m below grade; (4) Organism abundance is independent of dissolved oxygen concentration and temperature; and, (5) A moderate negative correlation exists between bicarbonate concentration and F. candida abundance. More detailed chemical and biological studies are planned to evaluate the potential ecological significance of this insect occurrence in groundwater.