Subtropical zooplankton assemblage promotes the harmful cyanobacterium Cylindrospermopsis raciborskii in a mesocosm experiment

Hong, Y; Burford, MA; Ralph, PJ; Doblin, MA

Subtropical zooplankton assemblage promotes the harmful cyanobacterium Cylindrospermopsis raciborskii in a mesocosm experiment

Hong, Y Burford, MA Ralph, PJ

Doblin, MA

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Publication Type:: Journal Article
Citation:: Journal of Plankton Research, 2014, 37 (1), pp. 90 - 101
Issue Date:: 2014-01-01

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Field	Value	Language
dc.contributor.author	Hong, Y	en_US
dc.contributor.author	Burford, MA	en_US
dc.contributor.author	Ralph, PJ https://orcid.org/0000-0002-3103-7346	en_US
dc.contributor.author	Doblin, MA https://orcid.org/0000-0001-8750-3433	en_US
dc.date.issued	2014-01-01	en_US
dc.identifier.citation	Journal of Plankton Research, 2014, 37 (1), pp. 90 - 101	en_US
dc.identifier.issn	0142-7873	en_US
dc.identifier.uri	http://hdl.handle.net/10453/37314
dc.description.abstract	© The Author 2014. Harmful algal blooms (HABs) with public health impacts threaten freshwater ecosystems, including drinking water reservoirs, globally. Subtropical systems are often dominated by filamentous and colonial cyanobacteria, algae that are potentially less accessible for consumption by resident meso-zooplankton grazers. Less understood than selective grazing is the role of zooplankton in regenerating nutrients and facilitating growth of algae with efficient uptake strategies, such as the toxin-producing cyanobacterium, Cylindrospermopsis raciborskii. Using ∼800-L bags suspended in the upper 3 m of the water column, we examined the growth of C. raciborskii under four treatments: 3 × ambient zooplankton biomass, 10 × zooplankton, 10 × zooplankton plus inorganic P addition and a no amendment control (3Z, 10Z, 10ZP, control, respectively). After 4 days, C. raciborskii relative abundance doubled in the 10Z and 10ZP treatments compared with the control and 3Z treatments, and after 7 days P addition resulted in ∼20% higher relative C. raciborskii biomass compared with other treatments, and an order of magnitude increase in N-fixing phytoplankton. The particulate C: P ratio declined in the 10Z and 10ZP mesocosms, indicating that meso-zooplankton facilitated P transfer to algae. Overall, the copepod dominated subtropical meso-zooplankton assemblage promoted C. raciborskii abundance and biomass over the short-term, demonstrating their facilitation of subtropical freshwater HAB formation.	en_US
dc.relation.ispartof	Journal of Plankton Research	en_US
dc.relation.isbasedon	10.1093/plankt/fbu095	en_US
dc.subject.classification	Marine Biology & Hydrobiology	en_US
dc.title	Subtropical zooplankton assemblage promotes the harmful cyanobacterium Cylindrospermopsis raciborskii in a mesocosm experiment	en_US
dc.type	Journal Article
utslib.citation.volume	1	en_US
utslib.citation.volume	37	en_US
utslib.for	0602 Ecology	en_US
utslib.for	0607 Plant Biology	en_US
utslib.for	0608 Zoology	en_US
utslib.for	0704 Fisheries Sciences	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/Strength - C3 - Climate Change Cluster
utslib.copyright.status	open_access
pubs.issue	1	en_US
pubs.publication-status	Published	en_US
pubs.volume	37	en_US

Abstract:

© The Author 2014. Harmful algal blooms (HABs) with public health impacts threaten freshwater ecosystems, including drinking water reservoirs, globally. Subtropical systems are often dominated by filamentous and colonial cyanobacteria, algae that are potentially less accessible for consumption by resident meso-zooplankton grazers. Less understood than selective grazing is the role of zooplankton in regenerating nutrients and facilitating growth of algae with efficient uptake strategies, such as the toxin-producing cyanobacterium, Cylindrospermopsis raciborskii. Using ∼800-L bags suspended in the upper 3 m of the water column, we examined the growth of C. raciborskii under four treatments: 3 × ambient zooplankton biomass, 10 × zooplankton, 10 × zooplankton plus inorganic P addition and a no amendment control (3Z, 10Z, 10ZP, control, respectively). After 4 days, C. raciborskii relative abundance doubled in the 10Z and 10ZP treatments compared with the control and 3Z treatments, and after 7 days P addition resulted in ∼20% higher relative C. raciborskii biomass compared with other treatments, and an order of magnitude increase in N-fixing phytoplankton. The particulate C: P ratio declined in the 10Z and 10ZP mesocosms, indicating that meso-zooplankton facilitated P transfer to algae. Overall, the copepod dominated subtropical meso-zooplankton assemblage promoted C. raciborskii abundance and biomass over the short-term, demonstrating their facilitation of subtropical freshwater HAB formation.

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http://hdl.handle.net/10453/37314