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Volume 7, issue 7
Biogeosciences, 7, 2129–2145, 2010
https://doi.org/10.5194/bg-7-2129-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.
Biogeosciences, 7, 2129–2145, 2010
https://doi.org/10.5194/bg-7-2129-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.

  08 Jul 2010

08 Jul 2010

Impacts of exotic mangrove forests and mangrove deforestation on carbon remineralization and ecosystem functioning in marine sediments

A. K. Sweetman1,*, J. J. Middelburg2,3, A. M. Berle4, A. F. Bernardino5, C. Schander4, A. W. J. Demopoulos6, and C. R. Smith7 A. K. Sweetman et al.
  • 1Norwegian Institute for Water Research (NIVA), Thormøhlensgate 53D, 5006 Bergen, Norway
  • 2Centre for Estuarine and Marine Ecology, Netherlands Institute of Ecology, P.O. Box 140, 4400 AC Yerseke, The Netherlands
  • 3Faculty of Geosciences, Utrecht University, P.O. Box 80021, 3508 TA Utrecht, The Netherlands
  • 4Department of Biology, University of Bergen, P.O. Box 7800, 5020 Bergen, Norway
  • 5Departamento de Oceanografia e Ecologia, Universidade Federal do Espirito Santo (UFES), Vitória, ES, Brazil
  • 6US Geological Survey, Florida Integrated Science Center, FISC-Gainesville, 7920 NW 71st Street, Gainesville, Florida, 32653, USA
  • 7Department of Oceanography, University of Hawaii at Manoa, 1000 Pope Road, Honolulu, Hawaii, 96822, USA
  • *formerly at: Department of Oceanography, University of Hawaii at Manoa, 1000 Pope Road, Honolulu, HI 96822, USA

Abstract. To evaluate how mangrove invasion and removal can modify short-term benthic carbon cycling and ecosystem functioning, we used stable-isotopically labeled algae as a deliberate tracer to quantify benthic respiration and C-flow over 48 h through macrofauna and bacteria in sediments collected from (1) an invasive mangrove forest, (2) deforested mangrove sites 2 and 6 years after removal of above-sediment mangrove biomass, and (3) two mangrove-free control sites in the Hawaiian coastal zone. Sediment oxygen consumption (SOC) rates averaged over each 48 h investigation were significantly greater in the mangrove and mangrove removal site experiments than in controls and were significantly correlated with total benthic (macrofauna and bacteria) biomass and sedimentary mangrove biomass (SMB). Bacteria dominated short-term C-processing of added microalgal-C and benthic biomass in sediments from the invasive mangrove forest habitat and in the 6-yr removal site. In contrast, macrofauna were the most important agents in the short-term processing of microalgal-C in sediments from the 2-yr mangrove removal site and control sites. However, mean faunal abundance and C-uptake rates in sediments from both removal sites were significantly higher than in control cores, which collectively suggest that community structure and short-term C-cycling dynamics of sediments in habitats where mangroves have been cleared can remain fundamentally different from un-invaded mudflat sediments for at least 6-yrs following above-sediment mangrove removal. In summary, invasion by mangroves can lead to dramatic shifts in benthic ecosystem function, with sediment metabolism, benthic community structure and short-term C-remineralization dynamics being affected for years following invader removal.

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