Competition limits adaptation and productivity in a photosynthetic alga at elevated CO2.
Competition limits adaptation and productivity in a photosynthetic alga at elevated CO2.
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DOI：
10.1098/rspb.2010.1173
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发表时间：
2011-01-22
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影响因子：
--
通讯作者：
Collins S
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文献类型：
--
作者：
Collins S
当谱系之间的竞争排斥和谱系内的遗传适应发生在同一时间尺度上时，这两个过程有可能相互作用。我使用实验微生物进化，其中光合微生物的菌株对CO2富集的生理反应不同，单独生长或在CO2富集下的数百代群落中生长。经过大约300代的生长，在适应环境变化的同时经历竞争的菌株比在没有竞争对手的情况下适应相同环境变化的相应菌株生产力更低，适应性更差。此外，我发现，排除竞争对手不仅限制了应变的适应性反应，非生物的变化，但也降低了社会生产力，我量化这种影响使用价格方程。最后，这些数据使我能够凭经验检验一个常见的假设，即在短期内最能利用单菌株种群中碳富集的浮游植物，在较长的时间尺度内，在多菌株群落中的频率会增加。
When competitive exclusion between lineages and genetic adaptation within lineages occur on the same timescale, the two processes have the potential to interact. I use experimental microbial evolution where strains of a photosynthetic microbe that differ in their physiological response to CO2 enrichment are grown either alone or in communities for hundreds of generations under CO2 enrichment. After about 300 generations of growth, strains that experienced competition while adapting to environmental change are both less productive and less fit than corresponding strains that adapted to that same environmental change in the absence of competitors. In addition, I find that excluding competitors not only limits that strain's adaptive response to abiotic change, but also decreases community productivity; I quantify this effect using the Price equation. Finally, these data allow me to empirically test the common hypothesis that phytoplankton that are most able to take advantage of carbon enrichment in single-strain populations over the short term will increase in frequency within multi-strain communities over longer timescales.
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