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

Ryan J K Dunn, David T. Welsh, Mark A. Jordan, James M. Arthur, Charles J. Lemckert, Peter R. Teasdale

Research output: Contribution to journalArticle

3 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)117-129
Number of pages13
JournalHydrobiologia
Volume693
Issue number1
DOIs
Publication statusPublished - Sep 2012
Externally publishedYes

Fingerprint

Avicennia marina
estuarine sediments
estuarine sediment
marina
leaf litter
plant litter
mangrove
metabolism
litter
nitrate reduction
sediments
nitrogen
sediment
denitrification
nitrate
nitrogen metabolism
nitrification
regeneration
bioturbation
marine sediments

Cite this

@article{1d5b780119734eafa0e4bb166fcbe5fb,
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",
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.",
keywords = "Bioturbation, Denitrification, Dissimilatory nitrate reduction to ammonium, Fluxes, Nitrification, Organic matter",
author = "Dunn, {Ryan J K} and Welsh, {David T.} and Jordan, {Mark A.} and Arthur, {James M.} and Lemckert, {Charles J.} and Teasdale, {Peter R.}",
year = "2012",
month = "9",
doi = "10.1007/s10750-012-1093-1",
language = "English",
volume = "693",
pages = "117--129",
journal = "Hydrobiologia",
issn = "0018-8158",
publisher = "Springer",
number = "1",

}

Interactive influences of the marine yabby (Trypaea australiensis) and mangrove (Avicennia marina) leaf litter on benthic metabolism and nitrogen cycling in sandy estuarine sediment. / Dunn, Ryan J K; Welsh, David T.; Jordan, Mark A.; Arthur, James M.; Lemckert, Charles J.; Teasdale, Peter R.

In: Hydrobiologia, Vol. 693, No. 1, 09.2012, p. 117-129.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Interactive influences of the marine yabby (Trypaea australiensis) and mangrove (Avicennia marina) leaf litter on benthic metabolism and nitrogen cycling in sandy estuarine sediment

AU - Dunn, Ryan J K

AU - Welsh, David T.

AU - Jordan, Mark A.

AU - Arthur, James M.

AU - Lemckert, Charles J.

AU - Teasdale, Peter R.

PY - 2012/9

Y1 - 2012/9

N2 - 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.

AB - 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.

KW - Bioturbation

KW - Denitrification

KW - Dissimilatory nitrate reduction to ammonium

KW - Fluxes

KW - Nitrification

KW - Organic matter

UR - http://www.scopus.com/inward/record.url?scp=84864303326&partnerID=8YFLogxK

U2 - 10.1007/s10750-012-1093-1

DO - 10.1007/s10750-012-1093-1

M3 - Article

VL - 693

SP - 117

EP - 129

JO - Hydrobiologia

JF - Hydrobiologia

SN - 0018-8158

IS - 1

ER -