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

    Author(s)
    Hong, Ying
    Burford, Michele A
    Ralph, Peter J
    Doblin, Martina A
    Griffith University Author(s)
    Burford, Michele A.
    Year published
    2015
    Metadata
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    Abstract
    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 ...
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    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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    Journal Title
    Journal of Plankton Research
    Volume
    37
    Issue
    1
    DOI
    https://doi.org/10.1093/plankt/fbu095
    Subject
    Ecosystem function
    Ecology
    Zoology
    Fisheries sciences
    Publication URI
    http://hdl.handle.net/10072/99132
    Collection
    • Journal articles

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