Browsing All Posts filed under »turbidity«

Collapsing waterweeds:  shading and herbivory work together

December 21, 2017

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In lakes and ponds, aquatic plants help to maintain clear-water conditions and their decline can cause a shift to a turbid state with lower biodiversity.  But what triggers the collapse of waterweed populations?  Grazing by aquatic herbivores would seem to be an obvious cause, but supporting evidence for this idea has proved surprisingly elusive, leading […]

More clarity on climate change

December 21, 2017

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Although climate change is warming many lakes around the world, there are big variations in their rate of temperature increase.  This variability is thought to be partly due to the fact that lakes differ widely in terms of water clarity, which is affected by factors such as land management, rainfall and changes in dissolved organic […]

A disturbing mix

June 19, 2017

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The common carp (Cyprinus carpio) has been introduced to many locations around the world and is highly invasive.  Its habit of foraging by digging in the bottom substrate significantly alters freshwater systems by uprooting plants, resuspending sediment, and increasing turbidity and the release of nutrients.  However, the extent to which aquatic nutrient flows are affected […]

Planting vegetation to stop stream bank erosion: where’s the evidence?

June 19, 2017

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Increased rates of stream bank erosion and sediment movement in disturbed catchments have been attributed to changes in catchment hydrology caused by land clearing, channel modification, the trampling activities of livestock and the removal of riparian vegetation. Given that these effects are human-induced, it’s commonly assumed that they can also be reversed by human intervention, […]

Remote surveillance: assessing water quality

June 1, 2016

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Remote sensing technology gives natural resource managers and landowners the ability to monitor environmental conditions in new and powerful ways. However, the remote assessment of water quality in lakes and ponds is complicated by wide variations in the inorganic and organic composition of suspended particles, which affect the optical environment, and the moderate- and medium-resolution […]

How environmentally-damaging are run-of-river hydropower systems?

June 1, 2016

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Hydropower generation typically involves the creation of large dams for the storage and release of water, which can have serious adverse effects on riverine environments. However, growing pressures on governments to meet renewable energy targets have stimulated interest in small-scale hydropower systems, especially run-of-river schemes, which use the flow within a river channel and operate […]

Chemical control of algae by submerged plants

October 15, 2015

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The appearance and ecology of lakes can be strongly affected by competition between large submerged plants (macrophytes) and algae. Macrophyte-dominated lakes tend to have a limited nutrient supply and clear water, while algal dominance is usually associated with nutrient enrichment and turbid water. Although macrophytes and algae compete mainly for nutrients and light, Belgian experiments […]