awarded to Honeoye Lake Watershed Taskforce

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Presentation transcript:

awarded to Honeoye Lake Watershed Taskforce Musseling In… Encore Presentation at the Honeoye Valley Association Annual Meeting of a previous report to Ontario County Water Resources Council on Special Project 3-2018, awarded to Honeoye Lake Watershed Taskforce

Acknowledgements Field and laboratory work was conducted with cooperation and assistance from Terry and Dorothy Gronwall This presentation was prepared by Dr. Bruce Gilman, Finger Lakes Community College

Desirable to periodically monitor invasive mussel population Impacts of Invasive Mussels: Food-web disruption, altered nutrient cycles, role in algal blooms, other changes in lake ecology, human health issues Desirable to periodically monitor invasive mussel population

Methods Field collection Laboratory work Analytical summary Replicating earlier studies, mussel samples were collected at three water depths in each of four locations within the littoral zone of Honeoye Lake (N=12). In 2018, three additional samples were taken in deeper locations. Laboratory work For each sample, total mussel count and total biomass were determined. Up to 100 shell length measurements were taken with digital calipers. Analytical summary Statistical analyses and chart production were completed in a Microsoft Excel© spreadsheet.

“Boom and bust” cycle in density

“Boom and bust” cycle in biomass

2018 shift to more but smaller zebra mussels

Shell length as proxy for mussel age

What we have learned Study year comparisons suggest subtle “boom and bust” cycles but additional field research is needed for verification. In Honeoye Lake, the density of zebra mussel populations are spatially variable and lower in numbers than those reported from the deeper, hard bottomed Finger Lakes. (For instance, Canandaigua Lake averaged nearly 6,000 dreissenid mussels per square meter in 2011 and again in 2016!) Lower densities in Honeoye Lake are likely caused by fewer hard substrates for attachment (reduced macrophyte beds and declining numbers of native clams) and limited over-wintering opportunities (removal of artificial substrates like docks). Most zebra mussels only live one year. Quagga mussels and Asian clams were not detected in Honeoye Lake for any of our study years.