Stability

Northeast management objective

Optimize economic and ecological stability

The management objective of optimizing stability refers to both economic and ecological stability. One way the Integrated Ecosystem Assessment quantifies economic stability in coastal communities is through species diversity indices (e.g. the Shannon Index) for the revenue generated within the ecosystem. A decrease in the index corresponds to a decrease in either the number of species utilized or the evenness of revenue across species, and can indicate a shift away from system stability. Fleet diversity is also calculated through time as a metric of economic stability. Diversity indices also provide insight into ecological stability, such as those developed for zooplankton diversity. These metrics are important for resource managers as they can indicate changes in the system which might disproportionately affect certain fishermen and communities.

Read indicator data on commercial fleet diversity, species revenue diversity, and icthyoplankton diversity to see the status and trends of the stability management objective. 

Hauling lobster trap on a trawl line. Maine, Boothbay Harbor. 1967 September.
Hauling a lobster trap on a trawl line in Boothbay Harbor, ME (1967). Credit: NOAA