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dc.contributor.authorHope, Julie A.en_NZ
dc.contributor.authorHewitt, Judi E.en_NZ
dc.contributor.authorPilditch, Conrad A.en_NZ
dc.contributor.authorSavage, Candidaen_NZ
dc.contributor.authorThrush, Simon F.en_NZ
dc.date.accessioned2020-10-11T20:34:26Z
dc.date.available2020-10-11T20:34:26Z
dc.date.issued2020en_NZ
dc.identifier.citationHope, J. A., Hewitt, J. E., Pilditch, C. A., Savage, C., & Thrush, S. F. (2020). Effect of nutrient enrichment and turbidity on interactions between Microphytobenthos and a key bivalve: implications for higher trophic levels. Frontiers in Marine Science, 7. https://doi.org/10.3389/fmars.2020.00695en
dc.identifier.urihttps://hdl.handle.net/10289/13881
dc.description.abstractBenthic diatoms are a high-quality food resource providing essential fatty acids to benthic grazers. Different stressors may alter the proportion of diatoms and other microalgae and thus can affect the quality as well as quantity of food available to benthic consumers. Microphytobenthos (MPB) lipid biomarkers were assessed in a field experiment to elucidate changes to the biosynthesis of fatty acids (FA) under nitrogen (N) enrichment (three levels) at eight intertidal sites that spanned a turbidity gradient. Influences on the flow of carbon and energy were determined using FA biomarkers of a functionally important deposit-feeding tellinid bivalve (Macomona liliana). Site-specific effects of N enrichment were detected in MPB quantity and quality measurements. Enrichment generally increased MPB biomass (chl a) across all sites, while the proportion of diatom associated fatty acid biomarkers was more variable at some sites. Analysis of sediment FA biomarkers and environmental variables suggested that changes to the microbial community composition and quality were related to water clarity and mud content of the bed. The ability of the MPB to utilize the increased nitrogen, as indicated by the resource use efficiency index, was also important. Despite the increase in MPB biomass, lipid reserves in the tissue of M. liliana, a primary consumer of MPB, were reduced (by up to 6 orders of magnitude) in medium and high N addition plots compared to control plots. Further, the nutritional quality of the bivalves to higher trophic levels [indicated by a lower ratio of essential FAs (ω3:ω6)] was reduced in high treatment plots compared to control plots suggesting the bivalves were adversely affected by nutrient enrichment but not due to a reduction in food availability. This study suggests anthropogenic nutrient enrichment and turbidity may indirectly alter the structure and function of the benthic food web, in terms of carbon flow and ecosystem productivity. This may indirectly change the interactions between MPB and key bivalves as suspended sediment concentrations and nutrient enrichment continue to increase globally. This has implications for various ecosystem functions that are mediated by these interactions, such as nutrient cycling as well as primary and secondary production.
dc.format.mimetypeapplication/pdf
dc.language.isoenen_NZ
dc.publisherFrontiers Media SAen_NZ
dc.rights© 2020 Hope, Hewitt, Pilditch, Savage and Thrush. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
dc.subjectScience & Technologyen_NZ
dc.subjectLife Sciences & Biomedicineen_NZ
dc.subjectEnvironmental Sciencesen_NZ
dc.subjectMarine & Freshwater Biologyen_NZ
dc.subjectEnvironmental Sciences & Ecologyen_NZ
dc.subjectfatty acid biomarkersen_NZ
dc.subjectbenthic microalgaeen_NZ
dc.subjectMPBen_NZ
dc.subjectnutrient enrichmenten_NZ
dc.subjectturbidityen_NZ
dc.subjectsoft sediment ecologyen_NZ
dc.subjectfood qualityen_NZ
dc.subjecttrophic interactionsen_NZ
dc.subjectFATTY-ACID-COMPOSITIONen_NZ
dc.subjectTEMPERATE AUSTRALIAN ESTUARYen_NZ
dc.subjectINORGANIC NITROGENen_NZ
dc.subjectSTABLE-ISOTOPEen_NZ
dc.subjectTERRIGENOUS SEDIMENTen_NZ
dc.subjectIN-SITUen_NZ
dc.subjectINTERTIDAL SANDFLATSen_NZ
dc.subjectVERTICAL MIGRATIONen_NZ
dc.subjectLIGHT AVAILABILITYen_NZ
dc.subjectBENTHIC MICROALGAEen_NZ
dc.titleEffect of nutrient enrichment and turbidity on interactions between Microphytobenthos and a key bivalve: implications for higher trophic levelsen_NZ
dc.typeJournal Article
dc.identifier.doi10.3389/fmars.2020.00695en_NZ
dc.relation.isPartOfFrontiers in Marine Scienceen_NZ
pubs.elements-id257463
pubs.publication-statusPublisheden_NZ
pubs.volume7en_NZ
dc.identifier.eissn2296-7745en_NZ
uow.identifier.article-noARTN 695


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