The interaction between climate warming and eutrophication to promote cyanobacteria is dependent on trophic state and varies among taxa
The interaction between climate warming and eutrophication to promote cyanobacteria is dependent on trophic state and varies among taxa
复制标题
DOI：
10.4319/lo.2014.59.1.0099
复制
发表时间：
2014-01-01
影响因子：
4.5
通讯作者：
Brookes, Justin D.
中科院分区：
文献类型：
--
作者：
Rigosi, Anna;Carey, Cayelan C.;Brookes, Justin D.
由于气候和土地利用的变化，预计蓝藻将增加。然而，在确定蓝藻水华的相对重要性和相互作用的升温温度和增加营养物质的可用性是未知的。我们调查了这两个因素在促进淡水湖泊浮游植物和蓝藻生物量的贡献。具体来说，我们问：（1）这两个驱动因素，温度或营养，是一个更好的预测蓝藻生物量？(2)营养物和温度是否显著地相互作用以影响浮游植物和蓝细菌，如果是，这种相互作用是协同的吗？和（3）这些因素之间的相互作用是否比单独的因素更能解释蓝藻生物量的变化？我们分析了来自超过1000个美国湖泊的数据，并证明在大多数情况下，温度和营养物质的相互作用不是协同的;相反，营养物质主要控制蓝藻生物量。这两个因子的相对重要性及其交互作用取决于湖泊的营养状态和蓝藻类群，在贫营养型湖泊中营养盐的作用更大，而在中营养型湖泊中温度的作用更大：只有富营养型和超富营养型湖泊的营养盐和温度之间存在显著的交互作用.同样，一些分类群，如鱼腥藻，对营养物质更敏感，而其他分类群，如微囊藻，对温度更敏感。我们将我们的结果与广泛的文献综述进行了比较，发现这些结果普遍得到了以前研究的支持。随着湖泊变得更加富营养化，蓝藻将更加敏感的营养和温度的相互作用，但最终营养是蓝藻生物量的更重要的预测。
Cyanobacteria are predicted to increase due to climate and land use change. However, the relative importance and interaction of warming temperatures and increased nutrient availability in determining cyanobacterial blooms are unknown. We investigated the contribution of these two factors in promoting phytoplankton and cyanobacterial biovolume in freshwater lakes. Specifically, we asked: (1) Which of these two drivers, temperature or nutrients, is a better predictor of cyanobacterial biovolume? (2) Do nutrients and temperature significantly interact to affect phytoplankton and cyanobacteria, and if so, is the interaction synergistic? and (3) Does the interaction between these factors explain more of the variance in cyanobacterial biovolume than each factor alone? We analyzed data from > 1000 U.S. lakes and demonstrate that in most cases, the interaction of temperature and nutrients was not synergistic; rather, nutrients predominantly controlled cyanobacterial biovolume. Interestingly, the relative importance of these two factors and their interaction was dependent on lake trophic state and cyanobacterial taxon. Nutrients played a larger role in oligotrophic lakes, while temperature was more important in mesotrophic lakes: Only eutrophic and hyper-eutrophic lakes exhibited a significant interaction between nutrients and temperature. Likewise, some taxa, such as Anabaena, were more sensitive to nutrients, while others, such as Microcystis, were more sensitive to temperature. We compared our results with an extensive literature review and found that they were generally supported by previous studies. As lakes become more eutrophic, cyanobacteria will be more sensitive to the interaction of nutrients and temperature, but ultimately nutrients are the more important predictor of cyanobacterial biovolume.