Leaf Stable Isotope and Nutrient Status of Temperate Mangroves As Ecological Indicators to Assess Anthropogenic Activity and Recovery From Eutrophication

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aut.relation.articlenumber1922en_NZ
aut.relation.journalFrontiers in Plant Scienceen_NZ
aut.relation.volume7en_NZ
aut.researcherDuxbury, Mark
dc.contributor.authorGritcan, Ien_NZ
dc.contributor.authorDuxbury, Men_NZ
dc.contributor.authorLeuzinger, Sen_NZ
dc.contributor.authorAlfaro, ACen_NZ
dc.date.accessioned2019-03-05T22:36:42Z
dc.date.available2019-03-05T22:36:42Z
dc.date.copyright2016-12en_NZ
dc.date.issued2016-12en_NZ
dc.description.abstractWe measured nitrogen stable isotope values (δ15N), and total phosphorus (%P) and total nitrogen (%N) contents in leaves of the temperate mangrove (Avicennia marina sp. australasica) from three coastal ecosystems exposed to various levels of human impact (Manukau, high; Mangawhai, low; and Waitemata, intermediate) in northern New Zealand. We measured δ15N values around 10‰ in environments where the major terrestrial water inputs are sewage. The highest average total nitrogen contents and δ15N values were found in the Auckland city region (Manukau Harbour) at 2.2%N and 9.9‰, respectively. The lowest values were found in Mangawhai Harbour, situated about 80 km north of Auckland city, at 2.0%N and 5.2‰, respectively. In the Waitemata Harbour, also located in Auckland city but with less exposure to human derived sewage inputs, both parameters were intermediate, at 2.1%N and 6.4‰. Total phosphorus contents did not vary significantly. Additionally, analysis of historical mangrove leaf herbarium samples obtained from the Auckland War Memorial Museum indicated that a reduction in both leaf total nitrogen and δ15N content has occurred over the past 100 years in Auckland’s harbors. Collectively, these results suggest that anthropogenically derived nitrogen has had a significant impact on mangrove nutrient status in Auckland harbors over the last 100 years. The observed decrease in nitrogenous nutrients probably occurred due to sewage system improvements. We suggest that mangrove plant physiological response to nutrient excess could be used as an indicator of long-term eutrophication trends. Monitoring leaf nutrient status in mangroves can be used to assess environmental stress (sewage, eutrophication) on coastal ecosystems heavily impacted by human activities. Moreover, nitrogen and phosphorus leaf contents can be used to assess levels of available nutrients in the surrounding environments.en_NZ
dc.identifier.citationFrontiers in Plant Science. 7:1922. doi: 10.3389/fpls.2016.01922
dc.identifier.doi10.3389/fpls.2016.01922en_NZ
dc.identifier.issn1664-462Xen_NZ
dc.identifier.urihttps://hdl.handle.net/10292/12313
dc.languageengen_NZ
dc.publisherFrontiers Research Foundationen_NZ
dc.relation.urihttps://www.frontiersin.org/articles/10.3389/fpls.2016.01922/full
dc.rights© 2016 Gritcan, Duxbury, Leuzinger and Alfaro. 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) or licensor 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.rights.accessrightsOpenAccessen_NZ
dc.subjectEnvironmental assessmenten_NZ
dc.subjectHerbarium isotope samplesen_NZ
dc.subjectLeaf nitrogen contenten_NZ
dc.subjectLeaf phosphorus contenten_NZ
dc.subjectMarine pollutionen_NZ
dc.subjectNitrogen stable isotope ratioen_NZ
dc.titleLeaf Stable Isotope and Nutrient Status of Temperate Mangroves As Ecological Indicators to Assess Anthropogenic Activity and Recovery From Eutrophicationen_NZ
dc.typeJournal Article
pubs.elements-id217940
pubs.organisational-data/AUT
pubs.organisational-data/AUT/Health & Environmental Science
pubs.organisational-data/AUT/Health & Environmental Science/Applied Science
pubs.organisational-data/AUT/Health & Environmental Science/School of Science
pubs.organisational-data/AUT/PBRF
pubs.organisational-data/AUT/PBRF/PBRF Health and Environmental Sciences
pubs.organisational-data/AUT/PBRF/PBRF Health and Environmental Sciences/HA Science 2018 PBRF
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