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Can Dungeness crab and eelgrass help improve management of our marine resources?
Date:2/15/2008

Putting theory into practice to manage complex and closely linked social and ecological systems along our coasts is a challenge, but one NOAA researcher Anne Guerry says can be addressed by a new approach to managing the value of our ocean resources.

Guerry will discuss the use of ecosystem services, the benefits that people obtain from ecosystems, in managing marine resources in her AAAS presentation Ecosystem Services Provided by the Nearshore in Puget Sound: An Analysis of Change. Puget Sound is home to 200 species of fish, 26 species of marine mammals, and over 625 species of seaweed, as well as 3.5 million people. How well the marine systems in Puget Sound function is directly linked to the regions quality of life and economy.

Guerry and colleagues focused on Dungeness crab harvests and the distribution of eelgrass, which sequesters or stores carbon from greenhouse emissions, as models to illustrate how changes in nearshore habitats and various management scenarios can affect these ecosystem services. By examining various scenarios that are based on real choices facing decision-makers, the team can compare the effects of various management decisions on the delivery of these services.

For example, Guerrys team gathered basic life history information about Dungeness crab and data on its abundance and harvests in the region. Using a model of the crab populations in the sound, they examined its sensitivity to changes in nearshore habitats and the resulting changes in harvestable crab. Those changes can ultimately be translated to changes in the dollar value of the crab harvest, and tracked through economic models to changes in other sectors of the economy.

The researchers also examined the ecosystem service of carbon storage provided by eelgrass habitats in the nearshore region of Puget Sound and the potential for it to change under different management scenarios. They mapped current known distributions of eelgrass, looked at known historical distributions and places where eelgrass has the potential to grow. Next they mapped various human impacts on eelgrass habitats, from shoreline armoring with bulkheads to overwater structures that block light and mechanical damage by dredging.

Making ecosystem services a useful concept to Puget Sound ecosystem management requires basic research on how services vary across the region and how they might be affected by alternative management schemes, Guerry said. The principles we use in Puget Sound can be applied to other regions.


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Contact: Ben Sherman
Ben.Sherman@NOAA.gov
202-253-5256
NOAA Research
Source:Eurekalert

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