Ecologists find strong evidence of fishing down the food web in freshwater lake

Research by ecologists shows strong evidence in a freshwater lake of 'fishing down the food web' – the deliberate shift away from top predatory fish on the food chain to smaller species closer to the base. While the effect has historically been observed almost exclusively in marine ecosystems and ocean fisheries, there has been little evidence of the effect in freshwater ecosystems.

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Fungicides as an underestimated hazard for freshwater organisms

Large amounts of fungicides, used in agriculture, leak into nearby surface waters. The effects of it on aquatic organisms are poorly understood and not specifically addressed in the EU regulatory frameworks with respect to the protection of surface waters. Scientists have found that pollution by fungicides can have unforeseen but far-reaching consequences for the functioning of aquatic systems — like indirect effects on the development of algal blooms.

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Researchers see need for action on forest fire risk

How do humans affect forest fires? An international team of researchers has now shown for a region in north-eastern Poland that forest fires increasingly occurred there after the end of the 18th century with the change to organized forestry. The increased number of fires subsequently made it necessary to manage and maintain the forests differently. In the wake of climate change, the researchers suggest new strategies for the fight against forest fires.

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Shark pups lose gains in stressed environments

Scientists compared the growth and body condition of one species of shark in two different environments. They found larger shark pups on degraded reefs grow less and perform worse than smaller pups on pristine reefs. Human-induced stressors, including climate change, put shark populations at risk — they may not be able to adapt fast enough to keep pace with the changes that are happening in their environment.

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We need more realistic experiments on the impact of climate change on ecosystems

When it comes to the impact of climate change on ecosystems, we still have large knowledge gaps. Most experiments are unrealistic because they do not correspond to projected climate scenarios for a specific region. Thus, we lack reliable data on what ecosystems might look like in the future, as a team of biodiversity researchers show.

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