Spatial distributions and contaminant burdens of Hexagenia (Ephemeroptera) populations in western Lake Erie
Conference
·
OSTI ID:201227
- Univ. of Windsor, Ontario (Canada)
Hexagenia populations, eradicated in the 1950`s by anoxia, are recovering in the western basin of Lake Erie. Since the Detroit River provides the largest contaminant load into the lake, the authors hypothesized that body burdens of Hexagenia would reflect a gradient of decreasing contamination from west to east across the basin and between shoreline and open water collections. In summer, 1994, the authors used light traps to collect sub-adults (females and males) and adults (females) at 9 locations throughout the western basin and 3 Detroit River sites. Mayflies were analyzed for 59 organochlorines including 42 congeners of PCBs by electron-capture detector gas chromatography. Results were analyzed using principal component analysis (PCA) to reduce autocorrelations among contaminants. There was a 1:1 correspondence for PCB concentrations between sub-adult and adult stages, indicating no change in body burden between moults. There was a pronounced west to east decline in mayfly body burdens from Monroe to Pelee Island; concentrations were reduced at shoreline sites (except Monroe) around the lake. Elevated contaminant concentrations in Hexagenia collected from the Detroit River reflected local inputs. The predicted spatial distribution of contaminant exposure in Hexagenia were confirmed, but the highest contamination levels occurred at Monroe rather than the Detroit River sites. Hexagenia adults are confirmed as effective and efficient monitors of organochlorine compounds.
- OSTI ID:
- 201227
- Report Number(s):
- CONF-9511137--; ISBN 1-880611-03-1
- Country of Publication:
- United States
- Language:
- English
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