Title

Dynamics of carbon sources supporting burial in seagrass sediments under increasing anthropogenic pressure

Authors

Ines Mazarrasa

Document Type

Article

Publisher

Wiley Blackwell

School

School of Natural Sciences

Funders

  • European Union Seventh Framework Program. Grant Number: OPERAS project. Contract number 308393
  • Obra Social “la Caixa”. Grant Number: PhD scholarship
  • Government of the Balearic Islands. Grant Number: PhD scholarship
  • Generalitat the Catalunya, MERS. Grant Number: 2014 SGR - 1356
  • Spanish Ministry of Economy and Competitiveness. Grant Number: EstresX project. Contract number CTM2012-32603
  • Ministerio de Economía y Competitividad. Grant Number: ICTA ‘Unit of Excellence’ (MinECo, MDM2015-0552

Grant Number

308393, PhD scholarship, 2014 SGR - 1356, CTM2012-32603, ICTA ‘Unit of Excellence’ (MinECo, MDM2015-0552

Comments

Originally published as : Mazarrasa, I., Marbà, N., Garcia‐Orellana, J., Masqué, P., Arias‐Ortiz, A., & Duarte, C. M. (2017). Dynamics of carbon sources supporting burial in seagrass sediments under increasing anthropogenic pressure. Limnology and Oceanography. Article can be found here

Abstract

Seagrass meadows are strong coastal carbon sinks of autochthonous and allochthonous carbon. The aim of this study was to assess the effect of coastal anthropogenic pressure on the variability of carbon sources in seagrass carbon sinks during the last 150 yr. We did so by examining the composition of the sediment organic carbon (Corg) stocks by measuring the δ13Corg signature and C : N ratio in 210Pb dated sediments of 11 Posidonia oceanica seagrass meadows around the Balearic Islands (Spain, Western Mediterranean) under different levels of human pressure. On average, the top meter sediment carbon deposits were mainly (59% ± 12%) composed by P. oceanica derived carbon whereas seston contribution was generally lower (41% ± 8%). The contribution of P. oceanica to the total sediment carbon stock was the highest (∼ 80%) in the most pristine sites whereas the sestonic contribution was the highest (∼ 40–80%) in the meadows located in areas under moderate to very high human pressure. Furthermore, an increase in the contribution of sestonic carbon and a decrease in that of seagrass derived carbon toward present was observed in most of the meadows examined, coincident with the onset of the tourism industry development and coastal urbanization in the region. Our results demonstrate a general increase of total carbon accumulation rate in P. oceanica sediments during the last century, mainly driven by the increase in sestonic Corg carbon burial, which may have important implications in the long-term carbon sink capacity of the seagrass meadows in the region examined.

DOI

10.1002/lno.10509