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| Titel |
Impacts of exotic mangrove forests and mangrove deforestation on carbon remineralization and ecosystem functioning in marine sediments |
| VerfasserIn |
A. K. Sweetman, J. J. Middelburg, A. M. Berle, A. F. Bernardino, C. Schander, A. W. J. Demopoulos, C. R. Smith |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 7, no. 7 ; Nr. 7, no. 7 (2010-07-08), S.2129-2145 |
| Datensatznummer |
250004893
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| Publikation (Nr.) |
 copernicus.org/bg-7-2129-2010.pdf |
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| Zusammenfassung |
| 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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