An analysis of primary production in the Daly River, a relatively unimpacted tropical river in northern Australia

Ian Webster, N Rea, Anna Padovan, Peter Dostine, S Townsend, S Cook

    Research output: Contribution to journalArticleResearchpeer-review

    Abstract

    In this paper, the dynamics of primary production in the Daly River in tropical Australia are investigated. We used the diurnal-curve method for both oxygen and pH to calculate photosynthesis and respiration rates as indicators of whole-river productivity. The Daly River has maximum discharges during the summer, monsoonal season. Flow during the dry season is maintained by groundwater discharge via springs. The study investigated how primary production and respiration evolve during the period of low flow in the river (April-November). The relationship between primary production and the availability of light and nutrients enabled the role of these factors to be assessed in a clear, oligotrophic tropical river. The measured rate of photosynthesis was broadly consistent with the estimated mass of chlorophyll associated with the main primary producers in the river (phytoplankton, epibenthic algae, macroalgae, macrophytes). A significant result of the analysis is that during the time that plant biomass re-established after recession of the flows, net primary production proved to be ?4% of the rate of photosynthesis. This result and the observed low-nutrient concentrations in the river suggest a tight coupling between photosynthetic fixation of carbon and the microbial degradation of photosynthetic products comprising plant material and exudates. � CSIRO 2005.
    Original languageEnglish
    Pages (from-to)303-316
    Number of pages14
    JournalMarine and Freshwater Research
    Volume56
    Issue number3
    Publication statusPublished - 2005

    Fingerprint

    Rivers
    primary production
    primary productivity
    Photosynthesis
    rivers
    river
    photosynthesis
    algae
    Plant Exudates
    respiration
    plant product
    Seaweed
    Phytoplankton
    Food
    plant products
    Calvin cycle
    nutrient
    net primary production
    Groundwater
    Chlorophyll

    Cite this

    Webster, Ian ; Rea, N ; Padovan, Anna ; Dostine, Peter ; Townsend, S ; Cook, S. / An analysis of primary production in the Daly River, a relatively unimpacted tropical river in northern Australia. In: Marine and Freshwater Research. 2005 ; Vol. 56, No. 3. pp. 303-316.
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    abstract = "In this paper, the dynamics of primary production in the Daly River in tropical Australia are investigated. We used the diurnal-curve method for both oxygen and pH to calculate photosynthesis and respiration rates as indicators of whole-river productivity. The Daly River has maximum discharges during the summer, monsoonal season. Flow during the dry season is maintained by groundwater discharge via springs. The study investigated how primary production and respiration evolve during the period of low flow in the river (April-November). The relationship between primary production and the availability of light and nutrients enabled the role of these factors to be assessed in a clear, oligotrophic tropical river. The measured rate of photosynthesis was broadly consistent with the estimated mass of chlorophyll associated with the main primary producers in the river (phytoplankton, epibenthic algae, macroalgae, macrophytes). A significant result of the analysis is that during the time that plant biomass re-established after recession of the flows, net primary production proved to be ?4{\%} of the rate of photosynthesis. This result and the observed low-nutrient concentrations in the river suggest a tight coupling between photosynthetic fixation of carbon and the microbial degradation of photosynthetic products comprising plant material and exudates. � CSIRO 2005.",
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    An analysis of primary production in the Daly River, a relatively unimpacted tropical river in northern Australia. / Webster, Ian; Rea, N; Padovan, Anna; Dostine, Peter; Townsend, S; Cook, S.

    In: Marine and Freshwater Research, Vol. 56, No. 3, 2005, p. 303-316.

    Research output: Contribution to journalArticleResearchpeer-review

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