On modelling the flow controls on macrophyte and epiphyte dynamics in a lowland permeable catchment: the River Kennet, southern England

Wade, Andrew J.; Whitehead, Paul; Hornberger, G. M.; Snook, Deborah L.

doi:10.1016/s0048-9697(01)00925-1

Cited by 64 publications

(26 citation statements)

References 26 publications

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“…In addition, temperature controls the growth rates of phytoplankton, macrophytes and epiphytes, making freshwater ecosystems sensitive to rising temperatures (Whitehead & Hornberger., 1984;Wade et al, 2002b). Water temperatures also regulate the behaviour of aquatic organisms, such as fish migration, and the timing of emergence and abundance of insect populations at different lifecycle stages (e.g.…”

Section: Hydrology Water Quality and Thermal Regimesmentioning

confidence: 99%

“…The impact of low flows on biotic communities has been studied extensively in the River Lambourn, UK (Wright et al, 1982). In this case, drought has a deleterious effect on aquatic ecology with Ranunculus being smothered by epiphytic algae (Wade et al, 2002b). Drought also significantly damages macro-invertebrates, although recovery can be fast (Ladle & Bass, 1981).…”

Section: Hydromorphology and Ecologymentioning

confidence: 99%

“…A number of techniques for estimating uncertainty in environmental models are currently being explored by Euro-limpacs participants. For example, a Monte Carlo-based tool is being used to perform sensitivity analysis, to identify key parameters and, hence, place confidence limits about model predictions (Wade et al, 2002b;Cox & Whitehead, 2004;Wilby, 2005). At the same time, less formal approaches are being used, such as applying different models to the same problem and comparing the results.…”

Section: Model Uncertaintymentioning

confidence: 99%

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A review of the potential impacts of climate change on surface water quality

Whitehead

Wilby

Battarbee

et al. 2009

Hydrological Sciences Journal

1,026

561

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It is now accepted that some human-induced climate change is unavoidable. Potential impacts on water supply have received much attention, but relatively little is known about the concomitant changes in water quality. Projected changes in air temperature and rainfall could affect river flows and, hence, the mobility and dilution of contaminants. Increased water temperatures will affect chemical reaction kinetics and, combined with deteriorations in quality, freshwater ecological status. With increased flows there will be changes in stream power and, hence, sediment loads with the potential to alter the morphology of rivers and the transfer of sediments to lakes, thereby impacting freshwater habitats in both lake and stream systems. This paper reviews such impacts through the lens of UK surface water quality. Widely accepted climate change scenarios suggest more frequent droughts in summer, as well as flash-flooding, leading to uncontrolled discharges from urban areas to receiving water courses and estuaries. Invasion by alien species is highly likely, as is migration of species within the UK adapting to changing temperatures and flow regimes. Lower flows, reduced velocities and, hence, higher water residence times in rivers and lakes will enhance the potential for toxic algal blooms and reduce dissolved oxygen levels. Upland streams could experience increased dissolved organic carbon and colour levels, requiring action at water treatment plants to prevent toxic by-products entering public water supplies. Storms that terminate drought periods will flush nutrients from urban and rural areas or generate acid pulses in acidified upland catchments. Policy responses to climate change, such as the growth of bio-fuels or emission controls, will further impact freshwater quality.Key words climate change; water quality; rivers; catchments; lakes; estuaries; ecology; hydrochemistry Une revue des impacts potentiels du changement climatique sur la qualité des eaux de surface Résumé Il est maintenant admis qu'un certain changement climatique d'origine anthropique est inévitable. Les impacts potentiels sur l'alimentation en eau ont fait l'objet de nombreuses attentions, mais peu de connaissances sont disponibles sur les changements associés en termes de qualité de l'eau. Les changements prévus en termes de température de l'air et de précipitations pourraient affecter les écoulements des rivières et par conséquent la mobilité et la dilution des substances polluantes. Une augmentation des températures de l'eau affectera la cinétique des réactions chimiques et, par combinaison avec les dégradations de la qualité, l'état écologique des hydrosystèmes. Une augmentation des écoulements aura pour conséquences des changements dans la puissance des cours d'eau et donc aussi des charges sédimentaires qui pourront altérer la morphologie des rivières et le transfert de sédiments vers les lacs, ce qui aura des impacts sur les habitats hydrobiologiques dans les systèmes lacustres et fluviatiles. Cet article fait une revue de tels imp...

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Section: Hydrology Water Quality and Thermal Regimesmentioning

confidence: 99%

Section: Hydromorphology and Ecologymentioning

confidence: 99%

Section: Model Uncertaintymentioning

confidence: 99%

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A review of the potential impacts of climate change on surface water quality

Whitehead

Wilby

Battarbee

et al. 2009

Hydrological Sciences Journal

1,026

561

View full text Add to dashboard Cite

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“…This is likely to have revitalised existing plants and initiated new growth by reducing the areas of low flow velocity within stands where growth may have been limited by diffusion (Westlake, 1967) or growth of epiphytic algae (Franklin, 2007;Wade et al, 2002) and exposing the remaining plant edges to higher desirable velocities (Franklin, 2007;Riis and Biggs, 2003).…”

Section: Instream Macrophyte Growth and Diversitymentioning

confidence: 99%

Instream and riparian implications of weed cutting in a chalk river

Old

Naden

Rameshwaran

et al. 2014

Ecological Engineering

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were monitored at a site on the River Lambourn (The CEH River Lambourn Observatory) and major instream and riparian impacts were observed. Measurements clearly demonstrated how weed cutting enhanced flood flow conveyance, reduced water levels (river and wetland), increased river velocities, and mobilised suspended sediment (with associated chemicals) and reduced the capacity for its retention within the river channel. Potential implications in relation to flood risk, water resources, downstream water quality, instream and riparian ecology, amenity value of the river, and wetland greenhouse gas emissions were considered. Provided the major influence of macrophytes on instream and riparian environments is fully understood then the manipulation of macrophytes represents an effective management tool that demonstrates the great potential of working with nature.

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“…Drought also has the potential to alter ecosystem functioning and the supply of ecological goods and ecosystem services, such as carbon and nutrient cycling and fish production. Organic matter processing by microbes and detritivores may decline during severe drought (Schlief and Mutz, 2011), whereas primary production can at first increase greatly because of elevated temperature and nutrients, but then decline dramatically and even cease as drying intensifies (Ledger and Hildrew, 2001;Ledger et al, 2008;Suren et al, 2003;Wade et al, 2002). Direct impacts on the secondary production of invertebrates and fish depend on drought intensity, with greatest effects occurring where flow cessation occurs (Lake, 2011;Ledger et al, 2011;Matthews and Marsh-Matthews, 2003).…”

Section: P0405mentioning

confidence: 99%