Effect of temperature on biogeochemistry of marine organic-enriched systems: implications in a global warming scenario

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Title: Effect of temperature on biogeochemistry of marine organic-enriched systems: implications in a global warming scenario
Authors: Sanz-Lázaro, Carlos | Valdemarsen, Thomas | Marín, Arnaldo | Holmer, Marianne
Research Group/s: Biología Marina
Center, Department or Service: Universidad de Alicante. Departamento de Ciencias del Mar y Biología Aplicada
Keywords: Benthic fluxes | Bioirrigation | Carbon mineralization | Climate change | Nereis diversicolor | Odense Fjord | Denmark | Organic enrichment | Sediment metabolism
Knowledge Area: Zoología
Issue Date: Oct-2011
Publisher: Ecological Society of America
Citation: Ecological Applications. 2011, 21(7): 2664-2677. doi:10.1890/10-2219.1
Abstract: Coastal biogeochemical cycles are expected to be affected by global warming. By means of a mesocosm experiment, the effect of increased water temperature on the biogeochemical cycles of coastal sediments affected by organic-matter enrichment was tested, focusing on the carbon, sulfur, and iron cycles. Nereis diversicolor was used as a model species to simulate macrofaunal bioirrigation activity in natural sediments. Although bioirrigation rates of N. diversicolor were not temperature dependent, temperature did have a major effect on the sediment metabolism. Under organic-enrichment conditions, the increase in sediment metabolism was greater than expected and occurred through the enhancement of anaerobic metabolic pathway rates, mainly sulfate reduction. There was a twofold increase in sediment metabolism and the accumulation of reduced sulfur. The increase in the benthic metabolism was maintained by the supply of electron acceptors through bioirrigation and as a result of the availability of iron in the sediment. As long as the sediment buffering capacity toward sulfides is not surpassed, an increase in temperature might promote the recovery of organic-enriched sediments by decreasing the time for mineralization of excess organic matter.
Sponsor: M. Holmer was supported by FNU 09-071369, C. Sanz-Lázaro was supported by a predoctoral grant from the Ministerio de Educación y Ciencia of Spain, and T. Valdemarsen was supported by EU-project Thresholds (Contract No. 003933).
URI: http://hdl.handle.net/10045/38123
ISSN: 1051-0761 | 1939-5582 (Online)
DOI: 10.1890/10-2219.1
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2011 by the Ecological Society of America
Peer Review: si
Publisher version: http://dx.doi.org/10.1890/10-2219.1
Appears in Collections:INV - BM - Artículos Científicos / Scientific Papers

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