Table 1. Environmental conditions at source population sites for 2013–2014.

Site	Tidal range (m)	Wave exposure	Temperature (°C)	Salinity (psu)	Substrate	Total nitrogen (μm)	Comments
Dorothy Cove, Nahant	3–4	Moderate	−1–21	30–32	Sand < 2% OM	25–34	Storm Water pipe at site
East Harbor, North Truro	0.3	Low	0–29	20–30	Sand < 2% OM	20–47	Tidally restricted; shallow embayment; 1 (Ha) eelgrass bed established 2008
Pleasant Bay, Orleans	2	Low	0–30	28–32	Sand < 2% OM	28–34	Low flushing; shallow embayment; thriving 40 (Ha) bed
Sea Gull Beach, West Yarmouth	3	High	−2–24	30–32	Sand < 2% OM	6–18	Shifting substrate

Note:

Temperature and salinity for Dorothy Cove is from the Boston Harbor NDBC NOAA buoy; temperature and salinity data for East Harbor and Pleasant Bay is courtesy of Cape Cod National Seashore-National Park Service (CCNS-NPS); temperature and salinity for Sea Gull Beach, West Yarmouth was assumed to be similar as the Menauhant NERRS buoy; nutrient information for Dorothy Cove is courtesy of Center for Coastal Studies; nutrient information for East Harbor, Pleasant Bay, and Sea Gull Beach courtesy of CCNS-NPS, Pleasant Bay Alliance, and the Massachusetts Estuaries’ Project (Dates 2012–2014).