2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/24/2018 | 9:45 AM - 10:00 AM | IMPROVING THE KNOWLEDGE BASE ON THE PHYSICAL EFFECTS OF FINE SEDIMENT FOR MACROINVERTEBRATES | 420 A
IMPROVING THE KNOWLEDGE BASE ON THE PHYSICAL EFFECTS OF FINE SEDIMENT FOR MACROINVERTEBRATES
Excessive fine sediment delivery can cause serious deleterious effects to riverine systems (e.g. increasing turbidity, clogging the river bed, smothering aquatic insects). There has been a drive to employ biomonitoring practices, instead of physical methods of measuring fine sediment, in these highly dynamic systems. A systematic literature review, which examined the response of macroinvertebrates to different gradients of fine sediment pollution, found that there was a wealth of evidence relating to organismal response to sediment associated contaminants, but indicated a distinct absence of studies which considered the direct and physical effects of fine sediment (e.g. clogging, abrasion) at the organism level. A recirculating flume experiment was set up to investigate physical damage on three different species of macroinvertebrate gills. Insect cadavers were exposed for eight hours to two concentrations of fine sediment (High/Low) and at two velocities (High/Low). Gills from cadavers of different species were damaged to varying extents and responded differently to treatments in a way that suggested gill morphology and behavioural responses (such as avoidance) as key factors.
- Sediment
- Pollution
- Bioassessment
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Presenters/Authors
Morwenna Mckenzie
(), Coventry University, mckenz36@coventry.ac.uk;
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Kate Mathers
(), Loughborough University, k.mathers@lboro.ac.uk;
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Paul Wood
(), Loughborough University, UK, p.j.wood@lboro.ac.uk;
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Martin Wilkes
(), Coventry University, ab9323@coventry.ac.uk;
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