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Biogeographical controls on the marine nitrogen fixers

机译:海洋固氮剂的生物地理控制

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We interpret the environmental controls on the global ocean diazotroph biogeography in the context of a three-dimensional global model with a self-organizing phytoplankton community. As is observed, the model's total diazotroph population is distributed over most of the oligotrophic warm subtropical and tropical waters, with the exception of the southeastern Pacific Ocean. This biogeography broadly follows temperature and light constraints which are often used in both field-based and model studies to explain the distribution of diazotrophs. However, the model suggests that diazotroph habitat is not directly controlled by temperature and light, but is restricted to the ocean regions with low fixed nitrogen and sufficient dissolved iron and phosphate concentrations. We interpret this regulation by iron and phosphate using resource competition theory which provides an excellent qualitative and quantitative framework.
机译:我们在具有自组织浮游植物群落的三维全球模型的背景下,解释了全球海洋重氮营养生物地理环境的控制措施。可以看出,该模型的重氮营养菌总数分布在除东南太平洋以外的大多数贫营养性亚热带和热带水域。这种生物地理学广泛地遵循温度和光的限制条件,这在基于现场的研究和模型研究中经常使用,以解释重氮营养菌的分布。但是,该模型表明重氮营养生境并不直接受温度和光照的控制,而是局限于固氮含量低,铁和磷酸盐溶解浓度足够的海洋区域。我们使用资源竞争理论来解释铁和磷酸盐的这种调控,这提供了极好的定性和定量框架。

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