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Urban point sources of nutrients were the leading cause for the historical spread of hypoxia across European lakes.

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Fig. 1. Location of the 1,607 study sites and changes in land cover over the last 300 years (CE 1700-2000)
Fig. 4. One hundred year trends for land cover in Europe based on an additive mixed-effect model (AMM), grouping watersheds according to their history of downstream lake hypoxia or reference source

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