Interactive influences of the marine yabby (Trypaea australiensis) and mangrove (Avicennia marina) leaf litter on benthic metabolism and nitrogen cycling in sandy estuarine sediment

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Title Interactive influences of the marine yabby (Trypaea australiensis) and mangrove (Avicennia marina) leaf litter on benthic metabolism and nitrogen cycling in sandy estuarine sediment
Author Dunn, Ryan Jay Keith; Welsh, David Thomas; Jordan, Mark; Arthur, Michael; Lemckert, Charles James; Teasdale, Peter
Journal Name Hydrobiologia
Year Published 2012
Place of publication Netherlands
Publisher Springer
Abstract A previous study has demonstrated that in sandy sediment the marine yabby (Trypaea australiensis) stimulated benthic metabolism, nitrogen regeneration and nitrification, but did not stimulate denitrification, as the intense bioturbation of the yabbies eliminated anoxic microzones amenable to denitrification. It was hypothesised that organic matter additions would alleviate this effect as the buried particles would provide anoxic microniches for denitrifiers. To test this hypothesis a 55-day microcosm (75 cm × 36 cm diameter) experiment, comprising four treatments: sandy sediment (S), sediment + yabbies (S + Y), sediment + A. marina litter (S + OM) and sediment + yabbies + A. marina litter (S + Y + OM), was conducted. Trypaea australiensis significantly stimulated benthic metabolism, nitrogen regeneration, nitrification and nitrate reduction in the presence and the absence of litter additions. In contrast, the effects of litter additions alone were more subtle, developed gradually and were only significant for sediment oxygen demand. However, there was a significant interaction between yabbies and litter with rates of total nitrate reduction and denitrification being significantly greater in the S + Y + OM than all other treatments, presumably due to the decaying buried litter providing anoxic micro-niches suitable to nitrate reduction. In addition, both T. australiensis and litter significantly decreased rates of DNRA and its contribution to nitrate reduction.
Peer Reviewed Yes
Published Yes
Alternative URI http://dx.doi.org/10.1007/s10750-012-1093-1
Volume 693
Issue Number 1
Page from 117
Page to 129
ISSN 0018-8158
Date Accessioned 2012-07-09
Date Available 2013-06-04T23:36:37Z
Language en_US
Research Centre Australian Rivers Institute; Environmental Futures Research Institute; Centre for Infrastructure Engineering and Management
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Environmental Chemistry (incl Atmospheric Chemistry); Marine and Estuarine Ecology (incl Marine Ichthyology)
URI http://hdl.handle.net/10072/47565
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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