Nitrogen response of natural phytoplankton communities: a new indicator based on photosynthetic efficiency Fv/Fm

Saeck, Emily Ann, O'Brien, Katherine Rosemary and Burford, Michele Astrid (2016) Nitrogen response of natural phytoplankton communities: a new indicator based on photosynthetic efficiency Fv/Fm. Marine Ecology Progress Series, 552 81-92. doi:10.3354/meps11729


Author Saeck, Emily Ann
O'Brien, Katherine Rosemary
Burford, Michele Astrid
Title Nitrogen response of natural phytoplankton communities: a new indicator based on photosynthetic efficiency Fv/Fm
Formatted title
Nitrogen response of natural phytoplankton communities: a new indicator based on photosynthetic efficiency Fv/Fm
Journal name Marine Ecology Progress Series   Check publisher's open access policy
ISSN 0171-8630
1616-1599
Publication date 2016-06-23
Year available 2016
Sub-type Article (original research)
DOI 10.3354/meps11729
Open Access Status Not yet assessed
Volume 552
Start page 81
End page 92
Total pages 12
Place of publication Oldendorf, Germany
Publisher Inter-Research
Collection year 2017
Language eng
Formatted abstract
The availability of the primary limiting nutrient plays a major role in driving the productivity, biomass and community composition of coastal phytoplankton, but there is an ongoing challenge to define the relationship between nutrient enrichment and phytoplankton response. This study explored a new indicator (N95) for quantifying nutrient response in natural phytoplankton communities. In this study, N95 specifically represented the required nitrogen addition (normalised to chlorophyll a) for the sampled phytoplankton population to reach 95% of nitrogenreplete photosynthetic efficiency. To calculate N95, an asymptotic model was applied to measures of phytoplankton photosynthetic efficiency (Fv/Fm) taken after 24 h incubations under a range of nitrogen enrichment treatments. Applying the method in an Australian subtropical bay, Moreton Bay, nitrogen response was lowest nearshore and high, yet variable, offshore. This pattern reflected the ambient nutrient gradient of declining concentrations with distance offshore. A Moreton Bay-specific threshold in phytoplankton nutrient response was identified at the ambient dissolved inorganic nitrogen concentration of 2 μ mol l-1, above which the response to nitrogen enrichment did not increase for 82% of samples. Advantages to measuring N95 were that incubations were simple to set up, incubation period was short, and Fv/Fm measures were simple to make. This approach advances options for using Fv/Fm measures to assess phytoplankton nutrient response and provides a new and sensitive biological indicator applicable to long-term water quality monitoring programs, relevant to parameterising ecological models and supporting decision making on nutrient management.
Keyword Bioassay
Eutrophication
Fluorescence
Maximum quantum yield of PSII
Microalgae
Microbial
PHYTO-PAM
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
HERDC Pre-Audit
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 0 times in Thomson Reuters Web of Science Article
Scopus Citation Count Cited 0 times in Scopus Article
Google Scholar Search Google Scholar
Created: Sun, 07 Aug 2016, 00:36:28 EST by System User on behalf of Learning and Research Services (UQ Library)