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Title: Evidence-based evaluation of the cumulative effects of ecosystem restoration

Journal Article · · Ecosphere
DOI:https://doi.org/10.1002/ecs2.1242· OSTI ID:1249268
 [1];  [1];  [1];  [1];  [2];  [1];  [1];  [1]
  1. Pacific Northwest National Lab., Sequim, WA (United States)
  2. National Oceanic and Atmospheric Administration, Newport, OR (United States)

Evaluating the cumulative effects of large-scale ecological restoration programs is necessary to inform adaptive ecosystem management and provide society with resilient and sustainable services. However, complex linkages between restorative actions and ecosystem responses make evaluations problematic. Despite long-term federal investments in restoring aquatic ecosystems, no standard evaluation method has been adopted and most programs focus on monitoring and analysis, not synthesis and evaluation. In this paper, we demonstrate a new transdisciplinary approach integrating techniques from evidence-based medicine, critical thinking, and cumulative effects assessment. Tiered hypotheses are identified using an ecosystem conceptual model. The systematic literature review at the core of evidence-based assessment becomes one of many lines of evidence assessed collectively, using critical thinking strategies and causal criteria from a cumulative effects perspective. As a demonstration, we analyzed data from 166 locations on the Columbia River and estuary representing 12 indicators of habitat and fish response to floodplain restoration actions intended to benefit threatened and endangered salmon. Synthesis of seven lines of evidence showed that hydrologic reconnection promoted macrodetritis export, prey availability, and fish access and feeding. The evidence was sufficient to infer cross-boundary, indirect, compounding and delayed cumulative effects, and suggestive of nonlinear, landscape-scale, and spatial density effects. On the basis of causal inferences regarding food web functions, we concluded that the restoration program has a cumulative beneficial effect on juvenile salmon. As a result, this evidence-based approach will enable the evaluation of restoration in complex coastal and riverine ecosystems where data have accumulated without sufficient synthesis.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1249268
Report Number(s):
PNNL-SA-104585; 400403209
Journal Information:
Ecosphere, Vol. 7, Issue 3; ISSN 2150-8925
Publisher:
Ecological Society of AmericaCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 30 works
Citation information provided by
Web of Science

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Cited By (4)

Storm-driven particulate organic matter flux connects a tidal tributary floodplain wetland, mainstem river, and estuary journal July 2018
Tidal-Fluvial and Estuarine Processes in the Lower Columbia River: II. Water Level Models, Floodplain Wetland Inundation, and System Zones journal April 2016
Estuary ecosystem restoration: implementing and institutionalizing adaptive management: Institutionalizing adaptive management journal August 2017
Do or do not. There is no try in restoration ecology journal July 2019