Ecosystem productivity of a wet-dry tropics wetland system

establishing a baseline understanding for conservation

Danelle Agnew, Kirstie Fryirs, Timothy J. Ralph, Tsuyoshi Kobayashi

    Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

    Abstract

    Terrestrial environments, including freshwater wetlands, play a key role in global carbon dynamics. Australian wet-dry tropics savannah wetlands function as wet season carbon sinks or dry season carbon sources under seasonal, yet variable, flow regimes. Land-use and climate change potentially affect carbon dynamics by altering these hydrological regimes and associated ecosystem processes, however these factors are inadequately quantified in Australia. Inundation patterns in these wetlands are hypothesised to drive a characteristic response in aquatic gross primary productivity and respiration. This response, as a significant component of wetland carbon cycling, would inform whether a wetland system is autotrophic or heterotrophic. This study assessed variation in aquatic ecosystem productivity in a wet-dry tropics wetland system at Kings Plains, Queensland. Ecosystem productivity was measured from samples obtained during the dry season in ephemeral and permanently inundated wetland areas. A biological oxygen demand experiment was undertaken using sediment inundated under laboratory conditions. Results indicated a dominance of respiration. This signal differs from semi-arid inland floodplain environments, where strongly intermittent hydrological regimes drive autotrophic aquatic productivity. Do the results indicate a seasonal low, or do wet-dry tropics wetlands have a naturally low productivity baseline? To assess for seasonal differences, samples will again be collected and analysed, immediately following the wet season, to determine wet season aquatic ecosystem productivity.
    Original languageEnglish
    Title of host publicationProceedings of the 9th Australian Stream Management Conference
    Subtitle of host publication12–15 August 2018, Hobart, Tasmania
    EditorsGeoff J. Vietz, Ian D. Rutherfurd
    Place of PublicationMelbourne, Victoria
    PublisherRiver Basin Management Society
    Pages790-797
    Number of pages8
    ISBN (Print)9780734054555
    Publication statusPublished - 12 Aug 2018
    EventAustralian Stream Management Conference (9th: 2018) - Hobart, Australia
    Duration: 12 Aug 201815 Aug 2018
    http://www.9asm.org.au/

    Conference

    ConferenceAustralian Stream Management Conference (9th: 2018)
    CountryAustralia
    CityHobart
    Period12/08/1815/08/18
    Internet address

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  • Cite this

    Agnew, D., Fryirs, K., Ralph, T. J., & Kobayashi, T. (2018). Ecosystem productivity of a wet-dry tropics wetland system: establishing a baseline understanding for conservation. In G. J. Vietz, & I. D. Rutherfurd (Eds.), Proceedings of the 9th Australian Stream Management Conference: 12–15 August 2018, Hobart, Tasmania (pp. 790-797). Melbourne, Victoria: River Basin Management Society.