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Atmospheric nitrogen deposition in world biodiversity hotspots: The need for a greater global perspective in assessing N deposition impacts

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JournalGlobal Change Biology
DatePublished - 1 Mar 2006
Issue number3
Volume12
Number of pages7
Pages (from-to)470-476
Original languageEnglish

Abstract

Increased atmospheric nitrogen (N) deposition is known to reduce plant diversity in natural and semi-natural ecosystems, yet our understanding of these impacts comes almost entirely from studies in northern Europe and North America. Currently, we lack an understanding of the threat of N deposition to biodiversity at the global scale. In particular, rates of N deposition within the newly defined 34 world biodiversity hotspots, to which 50% of the world's floristic diversity is restricted, has not been quantified previously. Using output from global chemistry transport models, here we provide the first estimates of recent (mid-1990s) and future (2050) rates and distributions of N deposition within biodiversity hotspots. Our analysis shows that the average deposition rate across these areas was 50% greater than the global terrestrial average in the mid-1990s and could more than double by 2050, with 33 of 34 hotspots receiving greater N deposition in 2050 compared with 1990. By this time, 17 hotspots could have between 10% and 100% of their area receiving greater than 15 kg N ha-1 yr-1, a rate exceeding critical loads set for many sensitive European ecosystems. Average deposition in four hotspots is predicted to be greater than 20 kg Nha-1 yr-1. This elevated N deposition within areas of high plant diversity and endemism may exacerbate significantly the global threat of N deposition to world floristic diversity. Overall, we highlight the need for a greater global approach to assessing the impacts of N deposition.

    Research areas

  • Conservation, Endemics, Nitrogen deposition, Plant diversity, Pollution, Species loss, TERRESTRIAL ECOSYSTEMS, SPECIES RICHNESS, CHALK-GRASSLAND, CONSEQUENCES, ECOREGIONS, POLLUTANTS, POPULATION, VEGETATION, SCENARIOS, AMMONIA

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