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Largest lake in Britain and Ireland has lost three-quarters of winter water birds
Date:11/13/2013

The largest lake in Britain and Ireland, Lough Neagh, has lost more than three quarters of its overwintering water birds according to researchers at Queen's University Belfast.

The study by Quercus, Northern Ireland's Centre for Biodiversity and Conservation Science, found the number of diving ducks migrating to the lake for the winter months has dropped from 100,000 to less than 21,000 in the space of a decade.

The research, published in the journal Freshwater Biology, found the ecosystem of the lake has dramatically changed since 2000/01 leading to a huge decline in the numbers of insects and snails living at the bottom of the lake. This combined with the effects of global climate change dramatically affected the numbers of migratory and overwintering water birds, a feature for which the lake is designated a Special Protection Area.

Dr Irena Tomnkov, from Quercus at the School of Biological Sciences at Queen's and who led the study, said: "Our research found there was a 66 per cent decline in the numbers of insects and snails in the lake and that this was associated with a decline of algae. As the water birds, which migrate from Northern and Eastern Europe to spend the winter months on the lake, depend on these invertebrates, we partly attribute their decline to the lack of food as well as the effects of climate change.

"Historically the lake was heavily affected by organic pollution as a result of nutrients from agricultural run-off. This artificially boosted its productivity. Now that conservation schemes are beginning to have an effect and reduce levels of pollution we are seeing increasing water quality and the unexpected consequence is fewer invertebrates and as a result less duck food."

An associated study published earlier this year showed that numbers of some key water bird species declined throughout south-western Europe at the same time as numbers equally dramatically increased in north-eastern Europe. The reason is that w
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Contact: Claire O'Callaghan
c.ocallaghan@qub.ac.uk
Queen's University Belfast
Source:Eurekalert

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