Fiche du document
1 octobre 2011
- handle: 10670/1.neo3fx
Mots-clés
water temperature riverine ecosystems rivers thermal regimes biotic responses aquatic organisms micro-scale heterogeneity modellingSujets proches
Canal aqueducts--Temperature Stream temperature Reservoirs--Temperature Surface water temperature Rivers--Temperature Lakes--Temperature Water--TemperatureCiter ce document
HF Dallas et al., « Micro-scale heterogeneity in water temperature », Water SA, ID : 10670/1.neo3fx
Métriques
Partage / Export
Résumé
Micro-scale heterogeneity in water temperature was examined in 6 upland sites in the Western Cape, South Africa. Hourly water temperature data converted to daily data showed that greatest differences were apparent in daily maximum temperatures between shallow- and deep-water biotopes during the warmest period of the year. Pool depth affected water temperature with deeper pools creating a more stable thermal environment. Groundwater-dependency affected water temperature differences with less groundwater-dependent rivers exhibiting greater differences in daily maximum temperatures. The importance of maintaining instream and riparian habitat, including pools, undercut banks, marginal vegetation, and an intact hyporheos, is discussed, giving examples of organisms utilising such habitats as thermal refugia. Considerations when choosing an appropriate model to simulate water temperatures, including groundwater-dependency, temporal and spatial scale, and study objectives, are discussed.