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Spring 2011 Update: Shelfwide Chlorophyll Concentration

The integrated mean annual chlorophyll concentration for the Northeast Shelf Ecosystem declined dramatically from the time series high set in 2009. The 2010 estimate is well below the time series mean marked by the dashed red line. Despite an above average spring bloom during the first half of the year, chlorophyll concentrations were below average for the second half of the year. This pattern of variation in chlorophyll concentration has the potential of affecting higher trophic levels by providing lower energy inputs than previous years, depending on the type of phytoplankton species comprising the bloom – not all contribute equally to energy transfer to upper trophic levels.

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