ecosystem services in the GoM that were identified by regional experts (Yoskowitz et al., 2010). Here we presented some of those ecosystem services with reasonable and calculable values and supporting databases.

This chapter is not intended to be comprehensive, but rather to highlight key parameters and provide guidance for determining changes in various ecosystem services. In approaching this task, three fundamental questions were addressed for each service specified: (1) describe the current state of knowledge, (2) identify the important measurable parameters, and (3) identify the best methods available to conduct those measurements. As reflected in this chapter, research and data for some services are much more readily available than others. Additionally, we must acknowledge there are many aspects of Gulf ecosystems that are dynamically changing from both natural and human-caused processes. This reality will make identifying appropriate baseline information a particular challenge.

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