Nutrient enrichment modifies temperature-biodiversity relationships in large-scale field experiments

Jianjun Wang (), Feiyan Pan, Janne Soininen, Jani Heino and Ji Shen
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Jianjun Wang: State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academic of Sciences
Feiyan Pan: Jiangsu Key Laboratory for Molecular and Medical Biotechnology, Nanjing Normal University
Janne Soininen: University of Helsinki
Jani Heino: Finnish Environment Institute, Natural Environment Centre, Biodiversity
Ji Shen: State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academic of Sciences

Nature Communications, 2016, vol. 7, issue 1, 1-9

Abstract: Abstract Climate effects and human impacts, that is, nutrient enrichment, simultaneously drive spatial biodiversity patterns. However, there is little consensus about their independent effects on biodiversity. Here we manipulate nutrient enrichment in aquatic microcosms in subtropical and subarctic regions (China and Norway, respectively) to show clear segregation of bacterial species along temperature gradients, and decreasing alpha and gamma diversity toward higher nutrients. The temperature dependence of species richness is greatest at extreme nutrient levels, whereas the nutrient dependence of species richness is strongest at intermediate temperatures. For species turnover rates, temperature effects are strongest at intermediate and two extreme ends of nutrient gradients in subtropical and subarctic regions, respectively. Species turnover rates caused by nutrients do not increase toward higher temperatures. These findings illustrate direct effects of temperature and nutrients on biodiversity, and indirect effects via primary productivity, thus providing insights into how nutrient enrichment could alter biodiversity under future climate scenarios.

Date: 2016
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DOI: 10.1038/ncomms13960

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