Delaware Estuary Fishery Ecosystem Model

The purpose of this research was to describe and quantify production and mortality of various ecosystem components in the Delaware Estuary ecosystem, and relate changes in production and mortality to various conservation measures for the Salem Generating Station.

We constructed a model of the Delaware Estuary ecosystem using Ecopath with Ecosim. We then used the model to assess the impacts of marsh restoration on the Delware Bay. Because restoration had already taken place, we had to configure the model to predict the state of the ecosystem if the restoration had not occured.

The results indicated that restoration increased total ecosystem biomass by 47.7 t km−2 year−1. Simulations indicated increased biomasses across a wide range of species including important forage and commercially important species. The marsh restoration also significantly impacted ecosystem structure increasing the ratio of production-to-respiration, increasing system path length and decreasing the ratio of production-to-biomass.

Full details are available here:

Frisk et al. (2011). Assessing biomass gains from marsh restoration in Delaware Bay using Ecopath with Ecosim. Ecological Modelling 222:190-2000.

Delaware Bay EwE model (EwE v6.4 compatiable, saved in Access 2003 format)

Related Links

Products from 1st workshop

* PSEG Estuary Enhancement Program

* Delaware Estuary Program

* Ecopath w Ecosim

Last revised: 1/18/2016