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  • How are macroinvertebrates of slow flowing lotic systems directly affected by suspended and deposited sediments?

    Author(s)
    Kefford, Ben J
    Zalizniak, Liliana
    Dunlop, Jason E
    Nugegoda, Dayanthi
    Choy, Satish C
    Griffith University Author(s)
    Dunlop, Jason
    Year published
    2010
    Metadata
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    Abstract
    The effects of suspended and deposited sediments on the macroinvertebrates are well documented in upland streams but not in slower flowing lowland rivers. Using species found in lowland lotic environments, we experimentally evaluate mechanisms for sediments to affect macroinvertebrates, and in one experiment whether salinity alters the effect of suspended sediments. Suspended kaolin clay reduced feeding of Ischnura heterosticta (Odonata: Coenagrionidae) at high turbidity (1000-1500 NTU) but had no effects on feeding of Hemianax papuensis (Odonata: Aeshnidae) and Micronecta australiensis (Hemiptera: Corixidae). In freshwater ...
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    The effects of suspended and deposited sediments on the macroinvertebrates are well documented in upland streams but not in slower flowing lowland rivers. Using species found in lowland lotic environments, we experimentally evaluate mechanisms for sediments to affect macroinvertebrates, and in one experiment whether salinity alters the effect of suspended sediments. Suspended kaolin clay reduced feeding of Ischnura heterosticta (Odonata: Coenagrionidae) at high turbidity (1000-1500 NTU) but had no effects on feeding of Hemianax papuensis (Odonata: Aeshnidae) and Micronecta australiensis (Hemiptera: Corixidae). In freshwater (0.1 mS/cm), survival of Ischnura aurora was poor in clear water, but improved with suspended kaolin. Growth and feeding of I. aurora were unaffected by suspended sediments and salinity. Burial (1-5 mm) of eggs with kaolin or sand reduced hatching in Physa acuta (Gastropoda: Physidae), Gyraulus tasmanica (Gastropoda: Planorbidae) and Chironomus cloacalis (Diptera: Chironomidae). Settling sediments may pose greater risk to lowland lotic invertebrates than suspended sediments. Sediment deposition may be more directly detrimental to macroinvertebrates of lowland rivers than suspended sediments.
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    Journal Title
    Environmental Pollution
    Volume
    158
    Issue
    2
    DOI
    https://doi.org/10.1016/j.envpol.2009.08.008
    Subject
    Environmental Sciences not elsewhere classified
    Publication URI
    http://hdl.handle.net/10072/37828
    Collection
    • Journal articles

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