Impacts of multiple stressors on ecosystem function: Leaf decomposition in constructed urban wetlands

Teresa J Mackintosh, Jenny DAVIS, Ross THOMPSON

    Research output: Contribution to journalArticle

    10 Citations (Scopus)

    Abstract

    The impact of stormwater on stream biota is well documented, but less is known about the impacts on ecosystem processes, such as the breakdown of organic matter. This study sought to establish whether the degree of urbanisation affected rates of leaf-litter breakdown within constructed wetlands. A litter bag method was used to ascertain rate of decomposition along a gradient of urbanisation (total imperviousness, TI), in constructed wetlands in western and south-eastern Melbourne. A significant positive relationship between TI and breakdown rate was found in the south-eastern wetlands. The significant reduction in rate of invertebrate-mediated breakdown with increasing concentration of certain metals was consistent with other studies. However, overall there was an increase in rate of breakdown. Studies have shown that the effects of heavy metals can be negated if nutrient levels are high. Our results suggest that other parameters besides exposure to contaminants are likely to affect leaf litter breakdown.
    Original languageEnglish
    Pages (from-to)221-232
    Number of pages12
    JournalEnvironmental Pollution
    Volume208
    DOIs
    Publication statusPublished - 2016

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    Wetlands
    Ecosystems
    Ecosystem
    Urbanization
    Decomposition
    Biota
    Invertebrates
    Heavy Metals
    Biological materials
    Nutrients
    Heavy metals
    Metals
    Impurities
    Food

    Cite this

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    title = "Impacts of multiple stressors on ecosystem function: Leaf decomposition in constructed urban wetlands",
    abstract = "The impact of stormwater on stream biota is well documented, but less is known about the impacts on ecosystem processes, such as the breakdown of organic matter. This study sought to establish whether the degree of urbanisation affected rates of leaf-litter breakdown within constructed wetlands. A litter bag method was used to ascertain rate of decomposition along a gradient of urbanisation (total imperviousness, TI), in constructed wetlands in western and south-eastern Melbourne. A significant positive relationship between TI and breakdown rate was found in the south-eastern wetlands. The significant reduction in rate of invertebrate-mediated breakdown with increasing concentration of certain metals was consistent with other studies. However, overall there was an increase in rate of breakdown. Studies have shown that the effects of heavy metals can be negated if nutrient levels are high. Our results suggest that other parameters besides exposure to contaminants are likely to affect leaf litter breakdown.",
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    Impacts of multiple stressors on ecosystem function: Leaf decomposition in constructed urban wetlands. / Mackintosh, Teresa J; DAVIS, Jenny; THOMPSON, Ross.

    In: Environmental Pollution, Vol. 208, 2016, p. 221-232.

    Research output: Contribution to journalArticle

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    AU - THOMPSON, Ross

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    AB - The impact of stormwater on stream biota is well documented, but less is known about the impacts on ecosystem processes, such as the breakdown of organic matter. This study sought to establish whether the degree of urbanisation affected rates of leaf-litter breakdown within constructed wetlands. A litter bag method was used to ascertain rate of decomposition along a gradient of urbanisation (total imperviousness, TI), in constructed wetlands in western and south-eastern Melbourne. A significant positive relationship between TI and breakdown rate was found in the south-eastern wetlands. The significant reduction in rate of invertebrate-mediated breakdown with increasing concentration of certain metals was consistent with other studies. However, overall there was an increase in rate of breakdown. Studies have shown that the effects of heavy metals can be negated if nutrient levels are high. Our results suggest that other parameters besides exposure to contaminants are likely to affect leaf litter breakdown.

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