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Eelgrass (Zostera marina L.) restoration in Puget Sound: development of a site suitability assessment process
Thom, R.; Gaeckle, J.; Buenau, K.; Borde, A.; Vavrinec, J.; Aston, L.; Woodruff, D.; Khangaonkar, T.; Kaldy, J. (2018). Eelgrass (Zostera marina L.) restoration in Puget Sound: development of a site suitability assessment process. Restor. Ecol. 26(6): 1066-1074. https://dx.doi.org/10.1111/rec.12702
In: Restoration Ecology. Blackwell: Cambridge, Mass.. ISSN 1061-2971; e-ISSN 1526-100X
|  |
| Auteurs | | Top |
- Thom, R.
- Gaeckle, J.
- Buenau, K.
|
- Borde, A.
- Vavrinec, J.
- Aston, L.
|
- Woodruff, D.
- Khangaonkar, T.
- Kaldy, J.
|
| Abstract |
The restoration of eelgrass (Zostera marina L.) is a high priority in Puget Sound, Washington, United States. In 2011, the state set a restoration target to increase eelgrass area by 4,200 ha by 2020, a 20% increase over the 21,500 ha then present. In a region as large, dynamic, and complex as Puget Sound, locating areas to restore eelgrass effectively and efficiently is challenging. To identify potential restoration sites we used simulation modeling, a geodatabase for spatial screening, and test planting. The simulation model of eelgrass biomass used time series of water properties (depth, temperature, and salinity) output from a regional hydrodynamic model and empirical water clarity data to indicate growth potential. The geographic information system‐based analysis incorporated results from the simulation model, historical and current eelgrass area, substrate, stressors, and shoreline manager input into a geodatabase to screen sites for field reconnaissance. Finally, we planted eelgrass at test sites and monitored survival. We screened 2,630 sites and identified 6,292 ha of highly to very highly suitable conditions for eelgrass—ample area for meeting the 20% target. Test plantings indicated that fine‐scale data are needed to improve predictive capability. We summarized the results of our analysis for the majority of the approximately 3,220 km of shoreline in Puget Sound on maps to support restoration site selection and planning. Our approach provides a process for identifying and testing potential restoration sites and highlights information needs and management actions to reduce stressors and increase eelgrass area to meet restoration objectives. |
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