Fifteen years of Pseudo-nitzschia in an Australian estuary, including the first potentially toxic P. delicatissima bloom in the southern hemisphere

Ajani, PA; Larsson, ME; Woodcock, S; Rubio, A; Farrell, H; Brett, S; Murray, SA

Fifteen years of Pseudo-nitzschia in an Australian estuary, including the first potentially toxic P. delicatissima bloom in the southern hemisphere

Ajani, PA

Larsson, ME

Woodcock, S

Rubio, A Farrell, H Brett, S Murray, SA

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Publication Type:: Journal Article
Citation:: Estuarine, Coastal and Shelf Science, 2020, 236
Issue Date:: 2020-05-05

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Field	Value	Language
dc.contributor.author	Ajani, PA https://orcid.org/0000-0001-5364-9936	en_US
dc.contributor.author	Larsson, ME https://orcid.org/0000-0003-4310-4582	en_US
dc.contributor.author	Woodcock, S https://orcid.org/0000-0003-4903-3164	en_US
dc.contributor.author	Rubio, A	en_US
dc.contributor.author	Farrell, H	en_US
dc.contributor.author	Brett, S	en_US
dc.contributor.author	Murray, SA https://orcid.org/0000-0001-7096-1307	en_US
dc.date.issued	2020-05-05	en_US
dc.identifier.citation	Estuarine, Coastal and Shelf Science, 2020, 236	en_US
dc.identifier.issn	0272-7714	en_US
dc.identifier.uri	http://hdl.handle.net/10453/138836
dc.description.abstract	© 2020 Elsevier Ltd In March 2018, an unprecedented bloom of a species of Pseudo-nitzschia occurred in Berowra Creek, a major tributary of the Hawkesbury River estuary, New South Wales, Australia (max cell abundance 5.7 × 106 cells L−1). Morphological and phylogenetic analysis showed the bloom was dominated by the species P. delicatissima, with toxin characterization by LC-MS confirming one of the seven strains isolated produced domoic acid (DA), at a concentration of 0.34 pg DA per cell. In response to this unprecedented bloom, we used a fifteen year series of phytoplankton and physico-chemical data to relate environmental factors to spatial and temporal variability of Pseudo-nitzschia species throughout the estuary. Species in the Pseudo-nitzschia delicatissima group consistently dominated all locations monitored throughout the estuary, with peak cell densities observed in the austral autumn (lowest in winter). Overall, Generalised Additive Models (GAMs) suggested that high cell concentrations of Pseudo-nitzschia were linked to an increase in soluble reactive phosphorus and a decrease in total nitrogen at all sites, with up to 55% of the deviance explained. Twenty species of Pseudo-nitzschia have now been reported in Australian coastal waters, four of which are confirmed DA producers. We hypothesise that increased urbanization, nutrient input and warmer waters could combine to increase Pseudo-nitzschia blooms in south-eastern Australia.	en_US
dc.relation.ispartof	Estuarine, Coastal and Shelf Science	en_US
dc.relation.isbasedon	10.1016/j.ecss.2020.106651	en_US
dc.subject.classification	Marine Biology & Hydrobiology	en_US
dc.title	Fifteen years of Pseudo-nitzschia in an Australian estuary, including the first potentially toxic P. delicatissima bloom in the southern hemisphere	en_US
dc.type	Journal Article
utslib.citation.volume	236	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
pubs.organisational-group	/University of Technology Sydney/Strength - C3 - Climate Change Cluster
utslib.copyright.status	closed_access
pubs.publication-status	Accepted	en_US
pubs.volume	236	en_US

Abstract:

© 2020 Elsevier Ltd In March 2018, an unprecedented bloom of a species of Pseudo-nitzschia occurred in Berowra Creek, a major tributary of the Hawkesbury River estuary, New South Wales, Australia (max cell abundance 5.7 × 106 cells L−1). Morphological and phylogenetic analysis showed the bloom was dominated by the species P. delicatissima, with toxin characterization by LC-MS confirming one of the seven strains isolated produced domoic acid (DA), at a concentration of 0.34 pg DA per cell. In response to this unprecedented bloom, we used a fifteen year series of phytoplankton and physico-chemical data to relate environmental factors to spatial and temporal variability of Pseudo-nitzschia species throughout the estuary. Species in the Pseudo-nitzschia delicatissima group consistently dominated all locations monitored throughout the estuary, with peak cell densities observed in the austral autumn (lowest in winter). Overall, Generalised Additive Models (GAMs) suggested that high cell concentrations of Pseudo-nitzschia were linked to an increase in soluble reactive phosphorus and a decrease in total nitrogen at all sites, with up to 55% of the deviance explained. Twenty species of Pseudo-nitzschia have now been reported in Australian coastal waters, four of which are confirmed DA producers. We hypothesise that increased urbanization, nutrient input and warmer waters could combine to increase Pseudo-nitzschia blooms in south-eastern Australia.

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http://hdl.handle.net/10453/138836