15 hours ago Public data sources from the Northeast Ocean Data portal help determine the impact of a new tidal energy project between Martha's Vineyard and Nantucket. Green areas show show coastal bird habitat. Credit: Leslie lab/Brown University
With many projects under development in coastal regions such as New England, tidal powerwhich extracts "hydrokinetic" energy from marine environmentsseems poised to join other U.S. commercial power sources. A new study finds that little is known of the impacts that tidal power projects may have on coastal environments and the people who depend on them, but that the perspective of "ecosystem services" could provide a promising framework for evaluating impacts.
"Ecosystem services are the benefits provided by functioning ecosystems to people," wrote environmental scientist Heather Leslie, the Peggy and Henry D. Sharpe Assistant Professor of Environmental Studies and Biology, in the current edition of the >Marine Technology Society Journal.
The study, written with former undergraduate student Megan Palmer, who is now with the Nature Conservancy, begins with a review of nearly 300 papers on marine and hydrokinetic (MHK) power systems. Only 36 focus on tidal power and of those only a handful specifically address ecosystem concerns, the authors found.
While developers are required to perform environmental studies before installing tidal energy harvesting devices, those wouldn't necessarily encompass the full range of connections between people and marine environments.
"The ability to explicitly link ecosystem health (or functioning, as ecologists often refer to it) and benefits to people is one of the notable differences between an ecosystem services analysis and a typical environmental impact statement," Leslie said.
To illustrate how ecosystem services might be applied to a project, Leslie and Palmer looked at the Muskeget Channel Tidal Energy Project, which is planned for a site south of Cape Cod, between Martha's Vineyard and Nantucket. After some analysis, the pair identified biodiversity, tourism and recreation, and food provision as the most important ecosystem services to assess.
Drawing on public data sources available through interactive Northeast Ocean Data portal, they illustrate that while the area of the channel where the power project is planned is likely an important area for coastal birds, such as terns and gulls, it might not be especially crucial for tourism and recreation or food provision.
The case study therefore suggests that the project would benefit from studying how the tidal energy infrastructure may affect the birds and their food resources, in order to better assess how the area's ecosystems and the services they provide to people are likely to be affected by the development. For instance, if the energy infrastructure enhances local fish populations, it could in turn enhance bird populations, which could have effects on both the coastal marine food web and nature-dependent recreational activities like bird-watching.
"An ecosystem services approach enables researchers and energy developers to create an integrative description of the possible environmental and socioeconomic impacts of a particular project, which in turn can help inform project planning, implementation and monitoring," Leslie and Palmer concluded.
Read more from the original source:
'Ecosystem services' help assess ocean energy development
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