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Information about 2004Summary

Published on January 3, 2008

Author: Kestrel

Source: authorstream.com

Oyster Pond 2004:  Oyster Pond 2004 Did Nitrogen load change? Did salinity change? What is causing macrophyte growth in Oyster Pond? Can fish, especially Alewives, thrive in a saltier Oyster Pond? What do fish in Oyster Pond eat? Ground Water:  Ground Water N from Treetops higher this year Treating sewage from Treetops with RUCK© system would reduce wastewater N load by 50% per year Water Quality:  Water Quality Water quality Comparison of Oyster Pond to Salt Pond - higher dissolved oxygen in OP - lower nitrate, ammonium, salinity in OP - no difference in phosphate except at depth Limiting nutrients -Both nitrogen and phosphate are limiting in OP and SP Interannual difference in Oyster Pond (2004 - 2001) - similar salinity or dissolved oxygen - lower nitrate in 2004 - similar ammonium and phosphate except at depth Macrophyte Growth:  Macrophyte Growth Macrophyte species, like Coontail, could indicate eutrophication δ15N of macrophytes, especially non-rooted species, suggest a significant impact of waste water derived nitrogen into Oyster Pond Fish in Oyster Pond:  Fish in Oyster Pond Fish More species in Salt Pond 3 species common in both Salt Pond and Oyster Pond: Alewife Silverside Mummichog Growth rates of fish in both ponds are similar High salinity does not impede Alewife growth during the first year Carbon source at base of food web differs between ponds Oyster Pond food web based on tree leaves Salt Pond food web based on Spartina Oyster Pond 2004 - Conclusions:  Oyster Pond 2004 - Conclusions Not a lot of change since we started studying Oyster Pond in 2001 Slightly more nitrate in groundwater Slightly different species of macrophytes Waste water remains the major source of nitrogen to the system Manipulating land use, by changing the input of wastewater, can significantly impact nitrogen loads to Oyster Pond Salt may not play as dominant a role in Alewife dynamics as is currently believed Thank you:  Thank you

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