Taking your dog for a walk in a nature reserve could harm biodiversity because its faeces and urine bring in excess nitrogen and phosphorus to the ecosystem.
, through disease transmission and disturbance, have been well-studied, little is known about the impact of their waste.at Ghent University in Belgium and his colleagues monitored the number of dogs at four sites in nature reserves less than 5 kilometres from the centre of Ghent between February 2020 and June 2021. They included forests, grassland and a meadow that were both popular for recreation and considered important for biodiversity.
They estimate that dogs bring 5 kilograms of phosphorus per hectare per year and 11 kilograms of nitrogen per hectare per year into suburban nature reserves.“That’s 50 per cent of the nitrogen that comes in via the rain,” says De Frenne. However, this assumes that the dogs’ owners don’t take any of the waste away with them.
These figures are significant, says De Frenne. Too much phosphorus or nitrogen – common components of fertilisers – in the soil can lead to loss of plant biodiversity and habitat degradation. “Dogs bring substantial amounts of nutrients to nature reserves and woodlands that should not be neglected,” says De Frenne. “Dog owners should be aware that their dog is behaving as a fertiliser, and if this is not yet the case, pick up their faeces more.”
The study found that if owners picked up all of the dogs’ faeces, this would reduce the nitrogen input by 57 per cent and the phosphorus input by 97 per cent.
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