Why are cold water fish bigger?

December 21, 2017

2

In a wide range of animal groups, maximum body sizes tend to be higher in temperate and polar species than in those living closer to the equator, and there’s been a lively debate about the underlying reasons for this trend.  French and Bolivian scientists  investigated possible explanations by using a family of freshwater fish (the […]

Invasive waterplants: be prepared

December 21, 2017

0

Investigators from Europe, the USA and New Zealand recently authored a comprehensive review of methods for the management of invasive freshwater plants.   As well as describing options for mechanical, biological and chemical control, the review includes information on relevant biology, management costs, the effects of management on freshwater ecosystems, and the post-management restoration of native […]

Deforestation means defishation

December 21, 2017

0

The impacts of tropical deforestation on terrestrial biodiversity are well known but only a few studies have considered the impacts of deforestation on freshwater systems.  Such effects are likely to be significant, given the importance of riparian vegetation as a source of nutrients and the high abundances of fish in tropical floodplain forests.  In a […]

More clarity on climate change

December 21, 2017

2

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 […]

Restoration and invertebrates: Build it and at least some of them will come

September 25, 2017

Comments Off on Restoration and invertebrates: Build it and at least some of them will come

It’s commonly assumed that the biodiversity of a disturbed ecosystem can be improved by restoring its original physical and chemical conditions. According to this “Field of Dreams” view (“build it and they will come”), ecosystem recovery occurs through the recolonization activities of lost species.  While a lot of river restoration is founded on Field of […]

Restoration and invertebrates: Reappraising stream condition indicators

September 25, 2017

Comments Off on Restoration and invertebrates: Reappraising stream condition indicators

In degraded rivers and stream systems, the replanting of riparian vegetation is a common restoration activity, partly because increases in shading, nutrient interception and litter fall are expected to provide food and habitat benefits for aquatic communities. Changed habitat conditions should be reflected in indices of stream condition, such as those based on macroinvertebrate richness. […]

Ironing out harmful algal blooms

September 25, 2017

Comments Off on Ironing out harmful algal blooms

An understanding of how iron affects the supply of nutrients in aquatic systems may open the door to better success in managing harmful algal blooms. In highly productive lakes, the release of phosphorus stored in the bottom sediment can encourage bloom development, but nutrient release is retarded in the presence of iron, which precipitates phosphorus […]