Average rating
Cast your vote
You can rate an item by clicking the amount of stars they wish to award to this item.
When enough users have cast their vote on this item, the average rating will also be shown.
Star rating
Your vote was cast
Thank you for your feedback
Thank you for your feedback
Author
Arnold, Mary R.Date Published
2001-04-12
Metadata
Show full item recordAbstract
Assemblages of diatoms, microscopic golden algae with siliceous frustules, have been used to assess the trophic states of lakes, ponds and bays. The trophic history of Sodus Bay, Wayne County, New York was investigated through identification and enumeration of diatom valves preserved in a 1-meter sediment core extracted from the Bay. Total phosphorus analysis also was performed. Removed with a KB corer in May 1998, the core was sectioned into 1 cm samples, which were freeze dried and 210Pb dated. Coverslips were prepared using Battarbee trays. Diatom valves, some as old as 338 years, were examined in transects of mounted coverslips. Phosphorus concentrations of digested samples were determined using a Technicon Auto-analyzer. Phosphorus concentrations were highest from 1795 to 1910 and in 1998. The Lake Trophic Status Index suggests that mesotrophic conditions existed from 1660 to 1681 and that eutrophic conditions developed in the ensuing centuries. These changes are consistent with settlement and the establishment of agriculture and shipping in the watershed.Collections