Anthropogenic impacts on nitrogen fixation rates between restored and natural Mediterranean salt marshes

TitleAnthropogenic impacts on nitrogen fixation rates between restored and natural Mediterranean salt marshes
Publication TypeJournal Article
Year of Publication2016
AuthorsMoseman-Valtierra S., Levin L.A, Martin R.M
JournalMarine Ecology-an Evolutionary Perspective
Date Published2016/04
Type of ArticleArticle
ISBN Number0173-9565
Accession NumberWOS:000374977500011
Keywordscalifornia; coastal; communities; Denitrification; dynamics; Invasive; lagoon-of-venice; marine ecosystems; plants; Salicornia; Sea level rise; sea-level; Spartina; succession; wetland

To test the effects of site and successional stage on nitrogen fixation rates in salt marshes of the Venice Lagoon, Italy, acetylene reduction assays were performed with Salicornia veneta- and Spartina townsendii-vegetated sediments from three restored (6-14years) and two natural marshes. Average nitrogen fixation (acetylene reduction) rates ranged from 31 to 343 mu mol C2H4.m(-2.)h(-1) among all marshes, with the greatest average rates being from one natural marsh (Tezze Fonde). These high rates are up to six times greater than those reported from Southern California Spartina marshes of similar Mediterranean climate, but substantially lower than those found in moister climates of the Atlantic US coast. Nitrogen fixation rates did not consistently vary between natural and restored marshes within a site (Fossei Est, Tezze Fonde, Cenesa) but were negatively related to assayed plant biomass within the acetylene reduction samples collected among all marshes. Highest nitrogen fixation rates were found at Tezze Fonde, the location closest to the city of Venice, in both natural and restored marshes, suggesting possible site-specific impacts of anthropogenic stress on marsh succession.

Short TitleMar. Ecol.-Evol. Persp.
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