Is saltmarsh restoration success constrained by matching natural environments or altered succession? A test using niche models

Sullivan, Martin J. P., Davy, Anthony J. ORCID:, Grant, Alastair ORCID: and Mossman, Hannah L. (2018) Is saltmarsh restoration success constrained by matching natural environments or altered succession? A test using niche models. Journal of Applied Ecology, 55 (3). 1207–1217. ISSN 0021-8901

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1. Restored habitats, such as saltmarsh created through managed realignment, sometimes fail to meet targets for biological equivalence with natural reference sites. Understanding why this happens is important in order to improve restoration outcomes.  2. Elevation in the tidal frame and sediment redox potential are major controls on the distribution of saltmarsh plants. We use niche models to characterize ten species’ responses to these, and test whether differences in species occurrence between restored and natural saltmarshes in the UK result from failure to re-create adequate environmental conditions.  3. Six species occurred less frequently in recently restored marshes than natural marshes. Failure of restored marshes to achieve the elevation and redox conditions of natural marshes partially explained the underrepresentation of five of these species, but did not explain patterns of occurrence on older (> 50 years) restored marshes.  4. For all species, an effect of marsh age remained after controlling for differences in environmental conditions. This could be due to differences in successional mechanism between restored and natural marshes. In recently restored marshes, high-marsh species occurred lower in the tidal frame and low-marsh species occurred at higher elevations than in natural marshes. This supports the hypothesis that competition is initially weaker in restored marshes, because of the availability of bare sediment across the whole tidal frame. Species that establish outside their normal realized niche, such as Atriplex portulacoides, may inhibit subsequent colonization of other species that occurred less frequently than expected on older restored marshes.  5. Synthesis and applications: Niche models can be used to test whether abiotic differences between restored sites and their natural counterparts are responsible for discrepancies in species occurrence. In saltmarshes, simply replicating environmental conditions will not result in equivalent species occurrence.

Item Type: Article
Uncontrolled Keywords: de-embankment,habitat restoration,managed realignment,niche models,plant community,redox,salt marsh,species distribution model,tidal frame,species occurrence
Faculty \ School: Faculty of Science > School of Biological Sciences
Faculty of Science > School of Environmental Sciences
UEA Research Groups: Faculty of Science > Research Centres > Centre for Ecology, Evolution and Conservation
Faculty of Science > Research Groups > Organisms and the Environment
Faculty of Science > Research Groups > Environmental Biology
Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences
Depositing User: Pure Connector
Date Deposited: 14 Sep 2017 05:04
Last Modified: 12 May 2023 07:30
DOI: 10.1111/1365-2664.13033


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