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As water temperatures rise due to global warming and nitrogen inputs change, it is important to understand how these changes are impacting vegetative communities that form the basic habitat structure in the Great Bay Estuary, NH. The abundance and taxa of intertidal seaweeds have been monitored at fixed locations throughout the Estuary since 2013. In 2020, percent cover and biomass were collected from five intertidal and four subtidal sampling locations. Data from 2013-2020 show appreciable amounts of nuisance seaweeds (primarily reds), including several introduced species. Cover of green seaweeds decreased significantly over time at the two intertidal sites (Depot Road and Adams Point), and red seaweed decreased at one site (Depot Road). However, results from 2020 still show high levels of nuisance red seaweed, particularly at the lowest intertidal elevations. At subtidal locations, cover of both eelgrass and algae was higher in 2020 than in 2019.
Jackson Estuarine Laboratory, Piscataqua Region Estuaries Partnership
Grant/Award Number and Agency
The Piscataqua Region Estuaries Partnership; New Hampshire Department of Environmental Services
Payne, A.R., D.M. Burdick, G.E. Moore, N.A. White, C.R. Peter, and A.C. Mathieson. 2021. Seaweed Monitoring in the Great Bay Estuary: 2020 Annual Report. The Piscataqua Region Estuaries Partnership. 25 pp.