期刊
GLOBAL CHANGE BIOLOGY
卷 18, 期 1, 页码 118-126出版社
WILEY
DOI: 10.1111/j.1365-2486.2011.02488.x
关键词
climate change; cyanobacteria; Europe; light; nutrients; phytoplankton; shade; South America; temperature; trophic state
资金
- European Community [ECOFRAME EVK1-CT-1999-00039]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq), Brazil [311427, 480122, 490487]
- Netherlands Organization for Scientific Research (NWO) [W84-549, WB84-586]
- National Geographic Society [7864-5]
- PEDECIBA, Maestria en Ciencias Ambientales, Donacion de Aguas de la Costa S.A.
- Banco de Seguros del Estado, Uruguay
- Dutch 'Knowledge for Climate Programme'
- Danish Research Council for Nature and Universe
- EU REFRESH
- CRES
- SNI (ANII)
Dominance by cyanobacteria hampers human use of lakes and reservoirs worldwide. Previous studies indicate that excessive nutrient loading and warmer conditions promote dominance by cyanobacteria, but evidence from global scale field data has so far been scarce. Our analysis, based on a study of 143 lakes along a latitudinal transect ranging from subarctic Europe to southern South America, shows that although warmer climates do not result in higher overall phytoplankton biomass, the percentage of the total phytoplankton biovolume attributable to cyanobacteria increases steeply with temperature. Our results also reveal that the percent cyanobacteria is greater in lakes with high rates of light absorption. This points to a positive feedback because restriction of light availability is often a consequence of high phytoplankton biovolume, which in turn may be driven by nutrient loading. Our results indicate a synergistic effect of nutrients and climate. The implications are that in a future warmer climate, nutrient concentrations may have to be reduced substantially from present values in many lakes if cyanobacterial dominance is to be controlled.
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