Photos of the Long Island Sound

Status and Trends: LISS Environmental Indicators

Type of Indicators: Health/Condition Response/Performance Socio-Economic Historical/Background

Contaminant Trends in Mussel Watch Sites

  • Connecticut
  • New York

Connecticut

Lind tCld tDDT tDld tPCB tBT LMW HMW tPAH As Cd Cu Hg Ni Pb Se Zn
Connecticut River No Trend Significantly Decreasing Significantly Decreasing No Trend No Trend Decreasing No Trend Significantly Decreasing Decreasing No Trend No Trend No Trend No Trend No Trend No Trend No Trend No Trend
New Haven Significantly Decreasing Significantly Decreasing Significantly Decreasing Significantly Decreasing Significantly Decreasing Decreasing No Trend No Trend No Trend No Trend Decreasing No Trend No Trend Decreasing No Trend No Trend No Trend
Housatonic River No Trend Significantly Decreasing No Trend Significantly Decreasing No Trend Significantly Decreasing No Trend No Trend No Trend No Trend No Trend No Trend No Trend No Trend No Trend No Trend No Trend
Sheffield Island No Trend Significantly Decreasing Significantly Decreasing No Trend Significantly Decreasing No Trend No Trend No Trend No Trend No Trend No Trend No Trend No Trend No Trend No Trend No Trend No Trend

Lind: Lindane; tCld: Total Chlordane; tDDT: Total DDT; tDld: Dieldrin; tPCB: Total PCB; tBT: TotalButyltins; LMW: Low Molecular Weight Aromatic Hydrocarbons; HMW: High Molecular Aromatic Hydrocarbons; tPAH: Total Polyaromatic Hydrocarbons; As: Arsenic; Cd: Cadmium; Cu: Copper; Hg: Mercury; Ni: Nickel; Pb: Lead; Se: Selenium; Zn: Zinc

Contaminant Levels:    No Trend   Increasing Increasing   Significantly Increasing Significantly Increasing   Decreasing Decreasing   Significantly Decreasing Significantly Decreasing

New York

Lind tCld tDDT tDld tPCB tBT LMW HMW tPAH As Cd Cu Hg Ni Pb Se Zn
Mamaroneck Significantly Decreasing Significantly Decreasing Significantly Decreasing Significantly Decreasing Significantly Decreasing Significantly Decreasing Significantly Decreasing Significantly Decreasing Decreasing
Throgs Neck Significantly Decreasing Significantly Decreasing Significantly Decreasing Significantly Decreasing Significantly Decreasing Decreasing Significantly Decreasing Significantly Decreasing Significantly Decreasing
Hempstead Harbor Significantly Decreasing Significantly Decreasing Significantly Decreasing Significantly Decreasing Significantly Decreasing Significantly Decreasing Significantly Decreasing Significantly Decreasing Significantly Decreasing Decreasing Significantly Decreasing
Huntington Harbor Significantly Decreasing Significantly Decreasing Significantly Decreasing Significantly Decreasing Significantly Decreasing Significantly Decreasing Decreasing Decreasing Significantly Decreasing
Port Jefferson Significantly Decreasing Significantly Decreasing Significantly Decreasing Significantly Decreasing Significantly Decreasing Significantly Decreasing Significantly Decreasing Significantly Decreasing Significantly Decreasing Increasing Increasing

Lind: Lindane; tCld: Total Chlordane; tDDT: Total DDT; tDld: Dieldrin; tPCB: Total PCB; tBT: TotalButyltins; LMW: Low Molecular Weight Aromatic Hydrocarbons; HMW: High Molecular Aromatic Hydrocarbons; tPAH: Total Polyaromatic Hydrocarbons; As: Arsenic; Cd: Cadmium; Cu: Copper; Hg: Mercury; Ni: Nickel; Pb: Lead; Se: Selenium; Zn: Zinc

Contaminant Levels:    No Trend   Increasing Increasing   Significantly Increasing Significantly Increasing   Decreasing Decreasing   Significantly Decreasing Significantly Decreasing

Source: NOAA, National Status and Trends Program, http://ccma.nos.noaa.gov/about/coast/nsandt/

What are contaminant trends in mussel Watch sites?

Since 1986, the National Status and Trends Mussel Watch program has monitored chemical contaminants in bivalve mollusks (mussels) in coastal sites across the U.S, including nine in Long Island Sound.

What does this indicate?

Concentrations of chemicals in mussel tissues are related to the levels of chemicals in the water that they inhabit and in the food that they filter from the water. Therefore, if chemical concentrations in the water and/or in food sources decline, chemical concentrations in the mussels themselves should decline as well.

Status

Overall, no chemical or metal has increased in concentration along Connecticut harbors. Contamination has been decreasing at many sites whose use of DDT and chlordane have been banned. In New York a majority of sites have seen a decline in chemical and heavy metal contamination. Port Jefferson has seen significantly declining trends in chemical contamination, but increasing trends in two metals, arsenic and copper.

 
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