Long-term changes in temperate Australian coastal waters: Implications for phytoplankton

Thompson, PA; Baird, ME; Ingleton, T; Doblin, MA

Long-term changes in temperate Australian coastal waters: Implications for phytoplankton

Thompson, PA Baird, ME

Ingleton, T Doblin, MA

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Publication Type:: Journal Article
Citation:: Marine Ecology Progress Series, 2009, 394 pp. 1 - 19
Issue Date:: 2009-12-17

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Field	Value	Language
dc.contributor.author	Thompson, PA	en_US
dc.contributor.author	Baird, ME https://orcid.org/0000-0003-4955-2298	en_US
dc.contributor.author	Ingleton, T	en_US
dc.contributor.author	Doblin, MA https://orcid.org/0000-0001-8750-3433	en_US
dc.date.issued	2009-12-17	en_US
dc.identifier.citation	Marine Ecology Progress Series, 2009, 394 pp. 1 - 19	en_US
dc.identifier.issn	0171-8630	en_US
dc.identifier.uri	http://hdl.handle.net/10453/8802
dc.description.abstract	A ∼60 yr physical and chemical data set from 4 coastal stations around Australia plus remotely sensed SeaWiFS and phytoplankton taxonomic data were used to evaluate the temporal and spatial variation in phytoplankton ecology. The most consistent trend observed at all stations was a long-term increase in surface salinity of ∼0.003 ± 0.0008 psu yr-1. All stations showed positive trends in temperature, with the fastest surface warming (0.0202°C yr-1 over 60 yr) in the western Tasman Sea. Long-term trends in warming and stratification were more evident in some months and were not well characterized by annual averages. There was no general pattern of increasing stratification (0 to 50 m); only some stations and a few months showed significant changes. Long-term trends in surface nitrate and phosphate concentrations were either not significant (3 instances) or positive (5 instances) and were up to 6.1 nM phosphate yr-1. A pronounced decline in silicate was evident at the 3 east coast stations, with concentrations falling by as much as 58 nM yr-1 over the last ∼30 yr. The western Tasman Sea experienced a ∼50% decline in the growth rate and biomass of the spring bloom from 1997 to 2007, while other sites showed significant temporal variability in chlorophyll a that was associated with the Southern Oscillation Index (SOI). Diatoms tended to dominate the microplankton, especially during periods of low stratification. In conclusion, the physical, chemical and biological properties of Australian temperate waters have changed considerably over the last 60 yr in response to variation in the SOI and the strengthening East Australian Current. © Inter-Research 2009.	en_US
dc.relation.ispartof	Marine Ecology Progress Series	en_US
dc.relation.isbasedon	10.3354/meps08297	en_US
dc.subject.classification	Marine Biology & Hydrobiology	en_US
dc.title	Long-term changes in temperate Australian coastal waters: Implications for phytoplankton	en_US
dc.type	Journal Article
utslib.citation.volume	394	en_US
utslib.for	060205 Marine and Estuarine Ecology (incl. Marine Ichthyology)	en_US
utslib.for	0405 Oceanography	en_US
utslib.for	0602 Ecology	en_US
utslib.for	0608 Zoology	en_US
dc.location.activity	ISI:A1997WF99000013
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/Strength - C3 - Climate Change Cluster
utslib.copyright.status	closed_access
pubs.publication-status	Published	en_US
pubs.volume	394	en_US

Abstract:

A ∼60 yr physical and chemical data set from 4 coastal stations around Australia plus remotely sensed SeaWiFS and phytoplankton taxonomic data were used to evaluate the temporal and spatial variation in phytoplankton ecology. The most consistent trend observed at all stations was a long-term increase in surface salinity of ∼0.003 ± 0.0008 psu yr-1. All stations showed positive trends in temperature, with the fastest surface warming (0.0202°C yr-1 over 60 yr) in the western Tasman Sea. Long-term trends in warming and stratification were more evident in some months and were not well characterized by annual averages. There was no general pattern of increasing stratification (0 to 50 m); only some stations and a few months showed significant changes. Long-term trends in surface nitrate and phosphate concentrations were either not significant (3 instances) or positive (5 instances) and were up to 6.1 nM phosphate yr-1. A pronounced decline in silicate was evident at the 3 east coast stations, with concentrations falling by as much as 58 nM yr-1 over the last ∼30 yr. The western Tasman Sea experienced a ∼50% decline in the growth rate and biomass of the spring bloom from 1997 to 2007, while other sites showed significant temporal variability in chlorophyll a that was associated with the Southern Oscillation Index (SOI). Diatoms tended to dominate the microplankton, especially during periods of low stratification. In conclusion, the physical, chemical and biological properties of Australian temperate waters have changed considerably over the last 60 yr in response to variation in the SOI and the strengthening East Australian Current. © Inter-Research 2009.

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http://hdl.handle.net/10453/8802