Benthic metabolism and nitrogen dynamics in an urbanised tidal creek: Domination of DNRA over denitrification as a nitrate reduction pathway
Benthic oxygen and nutrient fluxes and nitrate reduction rates were determined seasonally under light and dark conditions at three sites in a micro-tidal creek within an urbanised catchment (Saltwater Creek, Australia). It was hypothesized that stormwater inputs of organic matter and inorganic nitro...
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| Veröffentlicht in: | Estuarine, coastal and shelf science coastal and shelf science, 2013-10, Vol.131, p.271-281 |
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| creator | Dunn, Ryan J.K. Robertson, David Teasdale, Peter R. Waltham, Nathan J. Welsh, David T. |
| description | Benthic oxygen and nutrient fluxes and nitrate reduction rates were determined seasonally under light and dark conditions at three sites in a micro-tidal creek within an urbanised catchment (Saltwater Creek, Australia). It was hypothesized that stormwater inputs of organic matter and inorganic nitrogen would stimulate rates of benthic metabolism and nutrient recycling and preferentially stimulate dissimilatory nitrate reduction to ammonium (DNRA) over denitrification as a pathway for nitrate reduction. Stormwaters greatly influenced water column dissolved inorganic nitrogen (DIN) and suspended solids concentrations with values following a large rainfall event being 5–20-fold greater than during the preceding dry period. Seasonally, maximum and minimum water column total dissolved nitrogen (TDN) and DIN concentrations occurred in the summer (wet) and winter (dry) seasons. Creek sediments were highly heterotrophic throughout the year, and strong sinks for oxygen, and large sources of dissolved organic and inorganic nitrogen during both light and dark incubations, although micro-phytobenthos (MPB) significantly decreased oxygen consumption and N-effluxes during light incubations due to photosynthetic oxygen production and photoassimilation of nutrients. Benthic denitrification rates ranged from 3.5 to 17.7 μmol N m2 h−1, denitrification efficiencies were low ( |
| doi_str_mv | 10.1016/j.ecss.2013.06.027 |
| format | Article |
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Overall, due to the low denitrification efficiencies and high rates of N-regeneration, Saltwater Creek sediments would tend to increase rather than reduce dissolved nutrient loads to the downstream Gold Coast Broadwater and Moreton Bay systems. This may be especially true during wet periods when increased inputs of particulate organic nitrogen (PON) and suspended solids could respectively enhance rates of N-regeneration and decrease light availability to MPB, reducing their capacity to ameliorate N-effluxes through photoassimilation.</description><identifier>ISSN: 0272-7714</identifier><identifier>EISSN: 1096-0015</identifier><identifier>DOI: 10.1016/j.ecss.2013.06.027</identifier><identifier>CODEN: ECSSD3</identifier><language>eng</language><publisher>Kidlington: Elsevier Ltd</publisher><subject>Animal and plant ecology ; Animal, plant and microbial ecology ; benthic metabolism ; Biological and medical sciences ; Brackish water ecosystems ; denitrification ; dissimilatory nitrate reduction to ammonium ; Dissolution ; Drying ; Fundamental and applied biological sciences. Psychology ; Nitrates ; nutrient fluxes ; Nutrients ; Reduction ; Saltwater Creek ; Sediments ; Stormwater ; stormwater impacts ; sub-tropical ; Synecology ; Water circulation</subject><ispartof>Estuarine, coastal and shelf science, 2013-10, Vol.131, p.271-281</ispartof><rights>2013 Elsevier Ltd</rights><rights>2014 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c396t-8d0de0dd6cfa8d5917c8b1b9568ad2971380e06f52fbe5c635a883e08aada1da3</citedby><cites>FETCH-LOGICAL-c396t-8d0de0dd6cfa8d5917c8b1b9568ad2971380e06f52fbe5c635a883e08aada1da3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S0272771413003053$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,776,780,3537,27901,27902,65306</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=27779314$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Dunn, Ryan J.K.</creatorcontrib><creatorcontrib>Robertson, David</creatorcontrib><creatorcontrib>Teasdale, Peter R.</creatorcontrib><creatorcontrib>Waltham, Nathan J.</creatorcontrib><creatorcontrib>Welsh, David T.</creatorcontrib><title>Benthic metabolism and nitrogen dynamics in an urbanised tidal creek: Domination of DNRA over denitrification as a nitrate reduction pathway</title><title>Estuarine, coastal and shelf science</title><description>Benthic oxygen and nutrient fluxes and nitrate reduction rates were determined seasonally under light and dark conditions at three sites in a micro-tidal creek within an urbanised catchment (Saltwater Creek, Australia). It was hypothesized that stormwater inputs of organic matter and inorganic nitrogen would stimulate rates of benthic metabolism and nutrient recycling and preferentially stimulate dissimilatory nitrate reduction to ammonium (DNRA) over denitrification as a pathway for nitrate reduction. Stormwaters greatly influenced water column dissolved inorganic nitrogen (DIN) and suspended solids concentrations with values following a large rainfall event being 5–20-fold greater than during the preceding dry period. Seasonally, maximum and minimum water column total dissolved nitrogen (TDN) and DIN concentrations occurred in the summer (wet) and winter (dry) seasons. Creek sediments were highly heterotrophic throughout the year, and strong sinks for oxygen, and large sources of dissolved organic and inorganic nitrogen during both light and dark incubations, although micro-phytobenthos (MPB) significantly decreased oxygen consumption and N-effluxes during light incubations due to photosynthetic oxygen production and photoassimilation of nutrients. Benthic denitrification rates ranged from 3.5 to 17.7 μmol N m2 h−1, denitrification efficiencies were low (<1–15%) and denitrification was a minor process compared to DNRA, which accounted for ∼75% of total nitrate reduction.
Overall, due to the low denitrification efficiencies and high rates of N-regeneration, Saltwater Creek sediments would tend to increase rather than reduce dissolved nutrient loads to the downstream Gold Coast Broadwater and Moreton Bay systems. This may be especially true during wet periods when increased inputs of particulate organic nitrogen (PON) and suspended solids could respectively enhance rates of N-regeneration and decrease light availability to MPB, reducing their capacity to ameliorate N-effluxes through photoassimilation.</description><subject>Animal and plant ecology</subject><subject>Animal, plant and microbial ecology</subject><subject>benthic metabolism</subject><subject>Biological and medical sciences</subject><subject>Brackish water ecosystems</subject><subject>denitrification</subject><subject>dissimilatory nitrate reduction to ammonium</subject><subject>Dissolution</subject><subject>Drying</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Nitrates</subject><subject>nutrient fluxes</subject><subject>Nutrients</subject><subject>Reduction</subject><subject>Saltwater Creek</subject><subject>Sediments</subject><subject>Stormwater</subject><subject>stormwater impacts</subject><subject>sub-tropical</subject><subject>Synecology</subject><subject>Water circulation</subject><issn>0272-7714</issn><issn>1096-0015</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><recordid>eNqNkc1uFDEQhC0EEkvgBTj5gsRlJv7J2B7EJSQhIEVEQnC2euwe4mXGXmxv0L5DHprZbMQxyqml6q-qpS5C3nLWcsbV8bpFV0orGJctUy0T-hlZcdarhjHePSerRRGN1vzkJXlVynpReSfFitx9wlhvgqMzVhjSFMpMIXoaQ83pF0bqdxHm4AoNcVnQbR4ghoKe1uBhoi4j_v5Az9McItSQIk0jPf_2_ZSmW8zU4z4ojMEdllAo3GdDRZrRb929vIF68xd2r8mLEaaCbx7mEfn5-eLH2Zfm6vry69npVeNkr2pjPPPIvFduBOO7nmtnBj70nTLgRa-5NAyZGjsxDtg5JTswRiIzAB64B3lE3h9yNzn92WKpdg7F4TRBxLQtlivT6Z4Z0T8B1UoqZhRbUHFAXU6lZBztJocZ8s5yZvct2bXdt2T3LVmm7NLJYnr3kA_FwTRmiC6U_06hte4lP1m4jwcOl7_cBsy2uIDRoQ8ZXbU-hcfO_AOBnKqk</recordid><startdate>20131010</startdate><enddate>20131010</enddate><creator>Dunn, Ryan J.K.</creator><creator>Robertson, David</creator><creator>Teasdale, Peter R.</creator><creator>Waltham, Nathan J.</creator><creator>Welsh, David T.</creator><general>Elsevier Ltd</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SN</scope><scope>7ST</scope><scope>7TG</scope><scope>7TN</scope><scope>7U6</scope><scope>C1K</scope><scope>F1W</scope><scope>H95</scope><scope>H96</scope><scope>KL.</scope><scope>L.G</scope><scope>8FD</scope><scope>FR3</scope><scope>KR7</scope></search><sort><creationdate>20131010</creationdate><title>Benthic metabolism and nitrogen dynamics in an urbanised tidal creek: Domination of DNRA over denitrification as a nitrate reduction pathway</title><author>Dunn, Ryan J.K. ; Robertson, David ; Teasdale, Peter R. ; Waltham, Nathan J. ; Welsh, David T.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c396t-8d0de0dd6cfa8d5917c8b1b9568ad2971380e06f52fbe5c635a883e08aada1da3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2013</creationdate><topic>Animal and plant ecology</topic><topic>Animal, plant and microbial ecology</topic><topic>benthic metabolism</topic><topic>Biological and medical sciences</topic><topic>Brackish water ecosystems</topic><topic>denitrification</topic><topic>dissimilatory nitrate reduction to ammonium</topic><topic>Dissolution</topic><topic>Drying</topic><topic>Fundamental and applied biological sciences. Psychology</topic><topic>Nitrates</topic><topic>nutrient fluxes</topic><topic>Nutrients</topic><topic>Reduction</topic><topic>Saltwater Creek</topic><topic>Sediments</topic><topic>Stormwater</topic><topic>stormwater impacts</topic><topic>sub-tropical</topic><topic>Synecology</topic><topic>Water circulation</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Dunn, Ryan J.K.</creatorcontrib><creatorcontrib>Robertson, David</creatorcontrib><creatorcontrib>Teasdale, Peter R.</creatorcontrib><creatorcontrib>Waltham, Nathan J.</creatorcontrib><creatorcontrib>Welsh, David T.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Ecology Abstracts</collection><collection>Environment Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Oceanic Abstracts</collection><collection>Sustainability Science Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 1: Biological Sciences & Living Resources</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Civil Engineering Abstracts</collection><jtitle>Estuarine, coastal and shelf science</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Dunn, Ryan J.K.</au><au>Robertson, David</au><au>Teasdale, Peter R.</au><au>Waltham, Nathan J.</au><au>Welsh, David T.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Benthic metabolism and nitrogen dynamics in an urbanised tidal creek: Domination of DNRA over denitrification as a nitrate reduction pathway</atitle><jtitle>Estuarine, coastal and shelf science</jtitle><date>2013-10-10</date><risdate>2013</risdate><volume>131</volume><spage>271</spage><epage>281</epage><pages>271-281</pages><issn>0272-7714</issn><eissn>1096-0015</eissn><coden>ECSSD3</coden><abstract>Benthic oxygen and nutrient fluxes and nitrate reduction rates were determined seasonally under light and dark conditions at three sites in a micro-tidal creek within an urbanised catchment (Saltwater Creek, Australia). It was hypothesized that stormwater inputs of organic matter and inorganic nitrogen would stimulate rates of benthic metabolism and nutrient recycling and preferentially stimulate dissimilatory nitrate reduction to ammonium (DNRA) over denitrification as a pathway for nitrate reduction. Stormwaters greatly influenced water column dissolved inorganic nitrogen (DIN) and suspended solids concentrations with values following a large rainfall event being 5–20-fold greater than during the preceding dry period. Seasonally, maximum and minimum water column total dissolved nitrogen (TDN) and DIN concentrations occurred in the summer (wet) and winter (dry) seasons. Creek sediments were highly heterotrophic throughout the year, and strong sinks for oxygen, and large sources of dissolved organic and inorganic nitrogen during both light and dark incubations, although micro-phytobenthos (MPB) significantly decreased oxygen consumption and N-effluxes during light incubations due to photosynthetic oxygen production and photoassimilation of nutrients. Benthic denitrification rates ranged from 3.5 to 17.7 μmol N m2 h−1, denitrification efficiencies were low (<1–15%) and denitrification was a minor process compared to DNRA, which accounted for ∼75% of total nitrate reduction.
Overall, due to the low denitrification efficiencies and high rates of N-regeneration, Saltwater Creek sediments would tend to increase rather than reduce dissolved nutrient loads to the downstream Gold Coast Broadwater and Moreton Bay systems. This may be especially true during wet periods when increased inputs of particulate organic nitrogen (PON) and suspended solids could respectively enhance rates of N-regeneration and decrease light availability to MPB, reducing their capacity to ameliorate N-effluxes through photoassimilation.</abstract><cop>Kidlington</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.ecss.2013.06.027</doi><tpages>11</tpages></addata></record> |
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| ispartof | Estuarine, coastal and shelf science, 2013-10, Vol.131, p.271-281 |
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| language | eng |
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| source | Elsevier ScienceDirect Journals |
| subjects | Animal and plant ecology Animal, plant and microbial ecology benthic metabolism Biological and medical sciences Brackish water ecosystems denitrification dissimilatory nitrate reduction to ammonium Dissolution Drying Fundamental and applied biological sciences. Psychology Nitrates nutrient fluxes Nutrients Reduction Saltwater Creek Sediments Stormwater stormwater impacts sub-tropical Synecology Water circulation |
| title | Benthic metabolism and nitrogen dynamics in an urbanised tidal creek: Domination of DNRA over denitrification as a nitrate reduction pathway |
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