PNNL

Abstract

Factors that control the abundance and dynamics of habitats and resources are often not quantitatively understood. Conceptual models (e.g., box and line diagrams) are one useful method of organizing information on those factors that control habitat and resource dynamics. These models can be used to facilitate habitat monitoring, restoration, and ecosystem management. Two decades ago, the Chesapeake Bay National Estuary Program developed a simple model that has guided the monitoring program and driven restoration actions valued at millions of dollars. More recently, large ecosystem restoration programs in the Mississippi River delta and Florida Everglades have also incorporated conceptual models. In 2001, we developed a conceptual model for the Columbia River estuary to help trace the impacts of the proposed navigation channel deepening on juvenile salmon and other resources. In Puget Sound, we are currently employing a conceptual model to help improve eelgrass restoration and to understand the effects of shoreline armoring on nearshore marine habitats. The models present a logical, science-based method for evaluating potential multiple stressors on coastal ecosystems, planning restoration projects and refining a practical monitoring program, incorporating lessons learned, and communicating information on the programs to the public.