Browsing All Posts filed under »invertebrates«

Getting the message across

October 8, 2018

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Since recreational boaters can unintentionally spread invasive aquatic species while transporting boats and equipment from one body of water to another, it’s important that management agencies communicate the need for boaters to clean, drain and dry their gear after use.  Researchers used a questionnaire-based approach to find out if the way the “clean, drain and […]

How the food web affects river restoration

October 8, 2018

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River restoration commonly  concentrates on improving habitat quality for threatened fish populations.  However, because stream fish are strongly influenced by food availability, competition and predation, a case can be made for also incorporating food web modelling into the restoration process.  A group of environmental scientists developed an ecosystem model and applied it to a river-floodplain […]

Research on insect emergence warms up

October 8, 2018

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Long-term data show that climate change affects ecosystem functioning and the body size distributions of animal species, but more information is needed to understand the mechanisms underlying these changes.  There’s a need for experimental studies that take account of linkages between the aquatic and terrestrial environment and that simulate changes in the intensity and frequency […]

How does disturbance affect biodiversity?

October 8, 2018

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In freshwater systems, drying events are ramp disturbances that reduce habitat availability and connectivity, while floods are sudden pulse disturbances.  The relationship between disturbance and biodiversity is complex, and although some studies indicate that perennial rivers, which often flood, are more biodiverse than intermittent rivers, which periodically stop flowing and dry out, other work suggests […]

The magical diatom diet

July 5, 2018

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In forested headwater streams, detritus derived from decaying plant material is the primary source of energy driving the aquatic ecosystem, and most studies of such systems have focussed on the fate of leaf litter, the main resource.   However, because the food quality of detritus is extremely low it’s unclear how headwater streams support their  biological […]

Worms, midges and the greenhouse effect

July 5, 2018

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Severely impacted aquatic environments such as urban wetlands and wastewater treatment ponds are designed to treat large amounts of carbon and nitrogen, which raises concerns about their potential greenhouse gas emissions.  Because pollution-tolerant worms (oligochaetes) and insects (midges) can reach very high densities in such systems, it’s possible that their activities influence  the flux of […]

How delayed is the flow-on effect?

July 5, 2018

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It’s generally accepted that river flows have a major influence on the structure of stream communities, but what’s the lag time from river discharge to community expression?  This question is particularly relevant for headwater streams that are vulnerable to seasonal drying or the over-extraction of groundwater, where changes in flow often lead to successional changes […]