Show simple item record

dc.contributor.authorAbell, Jonathan M
dc.contributor.authorvan Dam-Bates, Paul
dc.contributor.authorOzkundakci, Deniz
dc.contributor.authorHamilton, David P
dc.date.accessioned2020-08-12T03:57:53Z
dc.date.available2020-08-12T03:57:53Z
dc.date.issued2020
dc.identifier.issn0028-8330
dc.identifier.doi10.1080/00288330.2020.1726974
dc.identifier.urihttp://hdl.handle.net/10072/396450
dc.description.abstractKnowledge of trophic status is fundamental to understanding the condition and function of lake ecosystems. We developed regression models to predict chlorophyll a concentrations (chl a) in New Zealand lakes for reference and current states, based on an existing dataset of total nitrogen (TN) and total phosphorus (TP) concentrations for 1031 lakes. Models were then developed to predict Secchi depth based on chl a and a sediment resuspension term applicable to shallow lakes. Estimates of all four Trophic Level Index (TLI) variables (chl a, TN, TP and Secchi depth) were analysed to estimate reference and current state TLI for the nationally representative sample of 1031 lakes. There was a trend of eutrophication between reference and current states, with systematic differences among lake geomorphic types. Mean chl a increased 3.5-fold (2.42 mg m−3 vs. 8.32 mg m−3) and mean Secchi depth decreased (indicating lower clarity) by approximately one-third (9.62 m vs. 6.48 m) between reference and current states. On average, TLI increased by 0.67, with the TLI increase >1 in approximately one-third (31%) of lakes. This study informs the status of lake ecosystems in NZ and provides benchmarks to guide management and assessment.
dc.description.peerreviewedYes
dc.languageEnglish
dc.language.isoeng
dc.publisherTaylor & Francis Group
dc.relation.ispartofpagefrom636
dc.relation.ispartofpageto657
dc.relation.ispartofissue4
dc.relation.ispartofjournalNew Zealand Journal of Marine and Freshwater Research
dc.relation.ispartofvolume54
dc.subject.fieldofresearchEnvironmental sciences
dc.subject.fieldofresearchFreshwater ecology
dc.subject.fieldofresearchEnvironmental management
dc.subject.fieldofresearchcode41
dc.subject.fieldofresearchcode310304
dc.subject.fieldofresearchcode410404
dc.subject.keywordsScience & Technology
dc.subject.keywordsLife Sciences & Biomedicine
dc.subject.keywordsPhysical Sciences
dc.subject.keywordsFisheries
dc.subject.keywordsMarine & Freshwater Biology
dc.titleReference and current Trophic Level Index of New Zealand lakes: benchmarks to inform lake management and assessment
dc.typeJournal article
dc.type.descriptionC1 - Articles
dcterms.bibliographicCitationAbell, JM; van Dam-Bates, P; Ozkundakci, D; Hamilton, DP, Reference and current Trophic Level Index of New Zealand lakes: benchmarks to inform lake management and assessment, New Zealand Journal of Marine and Freshwater Research, 2020, 54 (4), pp. 636-657
dc.date.updated2020-08-12T03:56:31Z
gro.hasfulltextNo Full Text
gro.griffith.authorHamilton, David P.


Files in this item

FilesSizeFormatView

There are no files associated with this item.

This item appears in the following Collection(s)

  • Journal articles
    Contains articles published by Griffith authors in scholarly journals.

Show simple item record