Browsing All Posts filed under »pollution«

Water quality: documenting a problem

June 26, 2022

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Many villages in subtropical countries possess ponds that can be used for a variety of purposes, including aquaculture, flood mitigation, groundwater recharge, carbon sequestration, recreation, biodiversity protection and water supply for irrigation and drinking.  However, in a large number of cases, these services can’t be supplied because the ponds are polluted.  As part of an […]

Water quality: a plankton-based treatment system

June 26, 2022

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Water fleas (cladocerans) are very common in freshwater plankton and they feed by filtering small particles from currents of water generated by their modified legs.  This ability led a team of Spanish researchers to investigate whether the filtration skills of water fleas can be harnessed to treat wastewater to provide an effective alternative to other […]

Lake management gets harder as the climate changes

March 26, 2022

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Excessive inflows of nutrients, especially phosphorus in fertilisers, pesticides and sewage, reduce water quality in lakes and reservoirs and can encourage toxic algal blooms, often with serious implications for public health, food security and biodiversity.  Increases in nutrient inputs are partly due to increased rainfall associated with  climate change.  And the availability and residence times […]

Water flow through the beds of streams

December 14, 2021

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The permeability of saturated sediments at the bottom of streams, where surface water and groundwater can mix, has a strong influence on the exchange of mass and energy across the sediment-water interface.  Streambed permeability depends mainly on sediment properties such as pore networks and the size and sorting of particles, and can vary greatly, even […]

Guidelines for conserving groundwater ecosystems

December 14, 2021

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Aquatic groundwater-dependent ecosystems include subsurface aquifers, springs, seepage wetlands and other groundwater-fed surface waters.  Their biodiversity is high: for example, in Europe around 13% of all freshwater animal species are found only in groundwater.  Many of these species are rare, with limited distributions, and some are “living fossils”.  Groundwater species deliver ecosystem services by recycling […]

How to capture the tiniest animals

December 14, 2021

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Although meiobenthic species are inconspicuous and the smallest animals living in aquatic sediments, they account for up to 80-90% of all animals in streams and lakes.  They play an important role in nutrient cycling, contribute up to half of all secondary production in freshwater food webs, and are good indicators of environmental pollution.  Meiofauna have […]

Land use patterns can aggravate toxic plankton blooms

September 28, 2021

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An understanding of how environmental factors affect the composition of biological communities is a crucial prerequisite for managing challenges due to climate change, land use practices and invasive species.  However, establishing the significance of interacting local and regional factors that vary widely across space and time is a challenge in itself.   Canadian biologists set out […]

Restoration of urban headwaters pays dividends

September 28, 2021

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Because urban streams are often ecologically degraded as a result of channelisation and pollution, restoration work is often attempted to improve ecosystem structure and function.  This usually involves remodelling of the stream channel.  Knowing that there are predictable shifts in ecosystem processes between headwater streams and the main body of the river, American ecologists investigated […]

Key wetland species deliver most ecosystem services

September 28, 2021

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There’s a lot of evidence that in ecosystems such as grasslands and forests, biodiversity is positively related to productivity and to the efficiency of nutrient recycling and decomposition.   On this basis it can be argued that the loss of biodiversity is likely to damage the delivery of ecosystem services.  However, in the case of wetlands, […]

Assessing human impacts on river systems

September 28, 2021

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Because many river systems have been significantly modified as a result of human activities, indicators of changing river structure and function are very helpful in guiding our efforts to manage rivers on a sustainable basis.  A number of different indicators based on the hydrology, chemistry or biology of rivers have been developed, but in many […]