Modeling the habitat range of phototrophs in yellowstone national park: toward the development of a comprehensive fitness landscape.
Modeling the habitat range of phototrophs in yellowstone national park: toward the development of a comprehensive fitness landscape.
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DOI：
10.3389/fmicb.2012.00221
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发表时间：
2012
影响因子：
5.2
通讯作者：
Peters JW
中科院分区：
文献类型：
--
作者：
Boyd ES;Fecteau KM;Havig JR;Shock EL;Peters JW
地球化学变化在多大程度上塑造了光养代谢的分布是基于怀俄明州黄石国家公园（YNP）地热泉的439个观测结果建模的。广义加性模型（GAMs）被开发来预测作为春季温度，pH值和总硫化物的函数的光合代谢的分布。由温度组成的GAM解释了38.8%的光养代谢分布的变化，而由硫化物和pH组成的GAM分别解释了19.6%和11.2%的变化。这些结果表明，所测量的变量，温度是主要的限制光养生物在YNP的分布。由多个变量组成的GAM解释了光养代谢分布的较大百分比的变化，表明变量之间的加性相互作用。结合温度和硫化物的GAM解释了数据集中的最大变化（53.4%），同时最大限度地减少了自由度的引入。为了验证光养生物分布在多大程度上反映了对活性的限制，我们研究了在光照和黑暗条件下硫化物和温度对溶解无机碳（DIC）吸收速率的影响。光驱动DIC吸收系统减少，在酸性，藻类为主的系统中，硫化物浓度的增加，但在碱性，蓝藻为主的系统不受影响。在碱性和酸性系统中，在比原位温度高10°C的温度下孵育的培养物中，光驱动的DIC摄取受到抑制。总的来说，这些定量结果表明，除了光的可用性，在YNP温泉的光养生物的栖息地范围主要是由温度和硫化物对这些人口的活动，居住在栖息地范围的边缘的限制。这些研究结果是一致的预测，从GAMs和提供一个定量的框架，从该框架翻译成健身景观的分布模式，用于解释环境的限制，塑造了这个过程的演变，通过地球历史。
The extent to which geochemical variation shapes the distribution of phototrophic metabolisms was modeled based on 439 observations in geothermal springs in Yellowstone National Park (YNP), Wyoming. Generalized additive models (GAMs) were developed to predict the distribution of phototrophic metabolism as a function of spring temperature, pH, and total sulfide. GAMs comprised of temperature explained 38.8% of the variation in the distribution of phototrophic metabolism, whereas GAMs comprised of sulfide and pH explained 19.6 and 11.2% of the variation, respectively. These results suggest that of the measured variables, temperature is the primary constraint on the distribution of phototrophs in YNP. GAMs comprised of multiple variables explained a larger percentage of the variation in the distribution of phototrophic metabolism, indicating additive interactions among variables. A GAM that combined temperature and sulfide explained the greatest variation in the dataset (53.4%) while minimizing the introduction of degrees of freedom. In an effort to verify the extent to which phototroph distribution reflects constraints on activity, we examined the influence of sulfide and temperature on dissolved inorganic carbon (DIC) uptake rates under both light and dark conditions. Light-driven DIC uptake decreased systematically with increasing concentrations of sulfide in acidic, algal-dominated systems, but was unaffected in alkaline, cyanobacterial-dominated systems. In both alkaline and acidic systems, light-driven DIC uptake was suppressed in cultures incubated at temperatures 10°C greater than their in situ temperature. Collectively, these quantitative results indicate that apart from light availability, the habitat range of phototrophs in YNP springs is defined largely by constraints imposed firstly by temperature and secondly by sulfide on the activity of these populations that inhabit the edges of the habitat range. These findings are consistent with the predictions from GAMs and provide a quantitative framework from which to translate distributional patterns into fitness landscapes for use in interpreting the environmental constraints that have shaped the evolution of this process through Earth history.
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