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Control by fiddler crabs (Uca vocans) and plant roots (Avicennia marina) on carbon, iron, and sulfur biogeochemistry in mangrove sediment

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dc.contributor Australian Institute Of Marine Science
dc.contributor Inst Biol
dc.contributor University Of Southern Denmark
dc.contributor Univ So Denmark
dc.contributor Australian Inst Marine Sci
dc.contributor Australian Institute Of Marine Science (aims) en ALONGI, DANIEL M. KRISTENSEN, ERIK 2013-02-28T06:47:54Z 2017-03-21T01:16:02Z 2017-03-21T01:16:02Z 2019-07-08T02:14:41Z 2017-03-21T01:16:02Z 2013-02-28T06:47:54Z 2013-02-28T06:47:54Z 2019-07-08T02:14:41Z 2006-07-01
dc.identifier 7086 en
dc.identifier.citation Kristensen E and Alongi DM (2006) Control by fiddler crabs (Uca vocans) and plant roots (Avicennia marina) on carbon, iron and sulfur biogeochemistry in mangrove sediment.. Limnology and Oceanography. 51: 1557-1571. en
dc.identifier.issn 0024-3590
dc.description.abstract The influence of mangrove saplings (Avicennia marina) and fiddler crabs (Uca vocans) on carbon, iron, and sulfur biogeochernistry in mangrove sediment was studied using outdoor mesocosms with and without plants (21 m(-2)) and crabs (68 m(-2)). Saplings grew more leaves and pneumatophores in the presence of crabs. Dense microalgal mats lead to two to six times higher benthic production and about two times higher benthic respiration in the absence of crabs. Particle mixing by crabs increased the reactive oxidized iron (Fe(III)) in the upper 2 cm of the sediment, whereas oxygen leaching by roots maintained the deeper rhizosphere oxidized and enriched in Fe(III). The highest microbial activity, measured as carbon dioxide production and iron reduction, occurred within the upper 2 cm of ungrazed sediment and was fueled by the large near-surface biomass of microalgae. Leaching of dissolved organic carbon (DOC) from roots stimulated bulk sulfate reduction and caused an upward cascading reduction of the sediment as indicated by low Fe(III) and high Fe(II) between 2-cm and 6-cm depth. The effect DOC was also evident as increased microbial abundance at all depths in the sediment. Fe(III) was the most important electron acceptor for microbial carbon oxidation in ungrazed sediment (63-70%), whereas sulfate reduction was more important in grazed sediment (36-44%), particularly in the presence of plants. Aerobic respiration always accounted for < 20%. Fiddler crabs and roots of A. marina have complementary effects on the biogeochemistry of mangrove sediment. Their association seems to be mutually beneficial with respect to growth and food availability.
dc.language English
dc.language en en
dc.relation.ispartof Null
dc.relation.ispartof Limnology and Oceanography - pages: 51: 1557-1571 en
dc.relation.uri en
dc.subject Wetland Plants
dc.subject Aquatic Sediments
dc.subject Organic-matter
dc.subject Ferric Iron
dc.subject Methane Production
dc.subject Bacterial Sulfate Reduction
dc.subject Fresh-water
dc.subject Nitrogen
dc.subject Limnology
dc.subject Marine & Freshwater Biology
dc.subject Benthic Metabolism
dc.subject Salt-marsh Sediments
dc.subject Oceanography
dc.title Control by fiddler crabs (Uca vocans) and plant roots (Avicennia marina) on carbon, iron, and sulfur biogeochemistry in mangrove sediment
dc.type journal article en
dc.identifier.wos WOS:000239262200001

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