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Auteur Kerstin Wasson |
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Assessing tidal marsh resilience to sea-level rise at broad geographic scales with multi-metric indices / Kenneth B. Raposa in Biological conservation, vol. 204, n°B (Décembre 2016)
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Titre : Assessing tidal marsh resilience to sea-level rise at broad geographic scales with multi-metric indices Type de document : texte imprimé Auteurs : Kenneth B. Raposa, Auteur ; Kerstin Wasson, Auteur ; Erik Smith, Auteur ; Jeffrey Crooks (Jeffrey A.), Auteur ; Patricia Delgado, Auteur ; Sarah Fernald (Sarah H.), Auteur ; Matthew Ferner (Matthew C.), Auteur ; Alicia Helms, Auteur ; Lyndie Hice (Lyndie A.), Auteur Année de publication : 2016 Article en page(s) : pp. 263-275 Langues : Anglais (eng) Catégories : [habitats/milieux] 1 - Habitats littoraux et halophile
[habitats/milieux] 5 - Tourbières et marais
[habitats/milieux] ZH - Zones humidesMots-clés : évaluation Système national de réserve de recherche estuarine (NERRS) résilience montée du niveau de la mer Résumé : "Tidal marshes and the ecosystem services they provide may be at risk from sea-level rise (SLR). Tidal marsh resilience to SLR can vary due to differences in local rates of SLR, geomorphology, sediment availability and other factors. Understanding differences in resilience is critical to inform coastal management and policy, but comparing resilience across marshes is hindered by a lack of simple, effective analysis tools. Quantitative, multi-metric indices are widely employed to inform management of benthic aquatic ecosystems, but not coastal wetlands. Here, we develop and apply tidal marsh resilience to sea-level rise (MARS) indices incorporating ten metrics that contribute to overall marsh resilience to SLR. We applied MARS indices to tidal marshes at 16 National Estuarine Research Reserves across the conterminous U.S. This assessment revealed moderate resilience overall, although nearly all marshes had some indication of risk. Pacific marshes were generally more resilient to SLR than Atlantic ones, with the least resilient marshes found in southern New England. We provide a calculation tool to facilitate application of the MARS indices to additional marshes. MARS index scores can inform the choice of the most appropriate coastal management strategy for a marsh: moderate scores call for actions to enhance resilience while low scores suggest investment may be better directed to adaptation strategies such as creating opportunities for marsh migration rather than attempting to save existing marshes. The MARS indices thus provide a powerful new approach to evaluate tidal marsh resilience and to inform development of adaptation strategies in the face of SLR." (source : auteurs) Type de publication : périodique Référence biblio : Raposa K., Wasson K., Smith E., Crooks J., Delgado P., Fernald S., Ferner M., Helms A., Hice L., 2016 - Assessing tidal marsh resilience to sea-level rise at broad geographic scales with multi-metric indices. Biological conservation, 204 : 263-275. ID PMB : 65415 DOI : 10.1016/j.biocon.2016.10.015 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=65415
in Biological conservation > vol. 204, n°B (Décembre 2016) . - pp. 263-275[article]Exemplaires(0)
Disponibilité aucun exemplaire Eutrophication decreases salt marsh resilience through proliferation of algal mats / Kerstin Wasson in Biological conservation, vol. 212(A) (Août 2017)
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Titre : Eutrophication decreases salt marsh resilience through proliferation of algal mats Type de document : texte imprimé Auteurs : Kerstin Wasson, Auteur ; et al., Auteur Année de publication : 2017 Article en page(s) : pp. 1-11 Langues : Anglais (eng) Mots-clés : Eutrophication Nutrient loading Salt marsh Ulva Wrack Résumé : "Globally, many estuaries are affected by nutrient loading from human land uses in the surrounding watersheds. One consequence of increased nutrient levels is proliferation of opportunistic macroalgae. We sought to understand spatial and temporal dynamics of ephemeral macroalgal mats and to examine their effects on salt marsh in a eutrophic estuary in central California. A time series analysis spanning 80 years revealed that algal wrack has increased exponentially in frequency on the salt marsh, and was highly correlated with nutrient concentrations in the estuary, which have increased along with fertilizer use. Analysis of sediment δ¹⁵N showed a dramatic increase in nutrient loads attributable to agricultural fertilizer over the past 50 years. We monitored 15 salt marsh plots along the bank edge and detected a negative relationship between algal wrack cover and salt marsh cover, flowering, and canopy height. Moreover, algal wrack led to retreat of vegetation from the bank edge, and increased bank erosion. We also experimentally added algal wrack to salt marsh edge plots. Algal addition decreased salt marsh cover, flowering, and canopy height, and increased retreat rate. By integrating time series analyses, isotope data, algal and marsh monitoring and manipulative experiments, we have identified robust linkages between increased anthropogenic nutrient loading, increased algal wrack cover, reduction in marsh resilience and conversion of marsh habitat to mudflat through bank erosion. Decreasing nutrient inputs to eutrophic estuaries is thus essential for conservation and restoration of salt marshes and enhancing their resilience in the face of sea level rise." Type de publication : périodique Référence biblio : Wasson K., et al., 2017 - Eutrophication decreases salt marsh resilience through proliferation of algal mats. Biological conservation, 212(A) : 1-11. DOI : 10.1016/j.biocon.2017.05.019 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=65900
in Biological conservation > vol. 212(A) (Août 2017) . - pp. 1-11[article]Exemplaires(0)
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