Irradiance and pH affect coccolithophore community composition on a transect between the North Sea and the Arctic Ocean
Irradiance and pH affect coccolithophore community composition on a transect between the North Sea and the Arctic Ocean
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DOI：
10.3354/meps09140
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发表时间：
2011-06
影响因子：
2.5
通讯作者：
A. Charalampopoulou;A. Poulton;T. Tyrrell;M. Lucas
中科院分区：
文献类型：
--
作者：
A. Charalampopoulou;A. Poulton;T. Tyrrell;M. Lucas
关于颗石藻在北极地区的分布情况，以及它们在某些地方缺席但在其他地方蓬勃发展的原因，人们知之甚少。被认为影响球藻石载体分布的因素包括营养物质、盐度、温度和光照以及碳酸盐化学参数。在这里，我们提出的数据收集在2008年夏天沿着一个断面之间的北海和斯瓦尔巴群岛（北极）。测量并比较了一组环境变量，包括常量营养素，盐度，温度，辐照度，pH值和颗石体的丰度和多样性？方解石在北海南部发现了18种颗石藻，以前认为那里没有颗石藻。在斯瓦尔巴特群岛北部的冰雪覆盖地区，Cocco lithophores是稀缺的，主要由Papposphaeraceae科。一个多变量的方法表明，在pH值和混合层的辐照度的变化解释了大部分的变化，在cocco lithophore分布和社区组成（斯皮尔曼的rS = 0.62）。斯瓦尔巴群岛人口和其他地区之间的差异主要是由pH值（RS = 0.45），而混合层的辐照度解释了北海，挪威海和北极水组合（RS = 0.40）之间的变化。细胞特异性钙化率的估计表明，物种组成可以大大影响社区钙化。因此，未来的海洋酸化（pH值变化）和全球变暖（混合层辐照度变化）造成的分层可能会影响浮游生物钙化，引起的变化的物种组成的cocco lithophore社区。
Little is known about the distribution of coccolithophores in Arctic regions, or the reasons why they are absent from certain locations but thrive in others. Factors thought to affect coccolithophore distribution include nutrients, salinity, temperature and light, as well as carbonate chemistry parameters. Here we present data collected in summer 2008 along a transect between the North Sea and Svalbard (Arctic). Coccolithophore abundance and diversity were measured and compared with a set of environmental variables that included macronutrients, salinity, temperature, irradiance, pH and ?calcite. Eighteen coccolithophore species were found in the southern North Sea where coccolithophores were previously thought to be absent. In the ice-covered region north of Svalbard, coccolithophores were scarce and dominated by the family Papposphaeraceae. A multivariate approach showed that changes in pH and mixed layer irradiance explained most of the variation in coccolithophore distribution and community composition (Spearman’s rS = 0.62). Differences between the Svalbard population and those from other regions were mostly explained by pH (rS = 0.45), whereas mixed layer irradiance explained most of the variation between the North Sea, Norwegian Sea and Arctic water assemblages (rS = 0.40). Estimates of cell specific calcification rates showed that species composition can considerably affect community calcification. Consequently, future ocean acidification (changes in pH) and stratification due to global warming (changes in mixed layer irradiance) may influence pelagic calcification by inducing changes in the species composition of coccolithophore communities.