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Why Small Ponds Have Enormous Value

January 04, 2018 |

This article was originally published at SwissInfo.

“Ponds may not seem as glamorous as rushing rivers or majestic lakes, but they’re indispensable when it comes to biodiversity and ecosystem health. In Switzerland natural ponds have all but vanished with the rise of agricultural intensification.

Only 12 kilometres to the east of the bustling city of Geneva at the Lullier Horticultural School, a cattail-shrouded pond blends in so perfectly with the bucolic surroundings that the eye passes right over it. But as Beat Oertli, a professor of aquatic ecology at the University of Applied Sciences of Western Switzerland (HESSO) explains, this pond isn’t just part of the landscape: it’s been strategically placed to protect a natural stream that lies downhill from one of the school’s fruit orchards.

“This is not a nice-looking pond, but its function isn’t to look nice,” Oertli says. “We’ve constructed it to protect the stream, because here at our school we use some fertilisers. All the rainwater flows into the pond first, where it is naturally filtered. Research shows that ponds like this can trap and degrade about 70% of pesticides that enter it within a year.”…”

Read on at: SwissInfo.

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