Browsing All Posts filed under »invertebrates«

Polluting antidepressants are more potent in high-pH systems

December 13, 2016

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The increased use of antidepressants in society means that the pollution of freshwater systems by SSRIs (serotonin selective reuptake inhibitors) is becoming more prevalent. SSRIs persist in the environment, bioaccumulate in animals, influence a wide range of physiological and behavioural processes and are toxic at high concentrations. Although it’s been established that SSRI toxicity is […]

Emergent wetland plants as conduits for methane

December 13, 2016

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Wetlands release more methane to the atmosphere than other any other type of ecosystem and wetland plants, especially those in the shallow fringing zones, play an important role in methane dynamics. However, aquatic plants can be damaged by the grazing activities of herbivorous animals. To examine the impacts of grazing damage on the release of […]

Volunteers collect high quality data

June 1, 2016

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Volunteer community groups are increasingly active in environmental monitoring, and often have the capacity to collect large amounts of data that can potentially complement or replace information gathered by management agencies. However, in some instances, scientists have expressed reservations about the reliability of community-generated data. New Zealand researchers compared the level of agreement between stream […]

“Cosmopolitan” species are often alien invaders

June 1, 2016

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Our ability to manage species invasions is often compromised by a lack of knowledge as to which species are actually aliens and which are natives. This is especially true in the case of animal groups containing small, poorly- studied species. In the absence of solid information, many such taxa have been uncritically assumed to have […]

Flow-on effects of water movement

March 23, 2016

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Although aquatic plants risk being uprooted in fast-flowing streams, if they’re capable of varying their growth form to suit the conditions they may be able to reduce the chance of dislodgement. To see if water plants can adapt to fast-moving water by increasing their strength and reducing their drag, Swedish researchers compared the growth of […]

Cold water plankton are bigger

March 23, 2016

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Because large-bodied zooplankton species have higher grazing rates, take a wider size-range of food items, and evade predators more easily than small species, variations in zooplankton body size can have a strong effect on aquatic food webs. An international group of biologists looked at the influence of temperature on the size of planktonic crustaceans by […]

Constructed wetlands can boost functional diversity

March 23, 2016

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The success of freshwater restoration projects has typically been assessed by reference to structural ecosystem features, such as water quality and species diversity. To date, indicators of ecosystem function have seldom been used for restoration assessment, but this situation is likely to change with the growing recognition that ecosystem processes are reflected in the biological […]