Temperature‐dependence of minimum resource requirements alters competitive hierarchies in phytoplankton
Temperature‐dependence of minimum resource requirements alters competitive hierarchies in phytoplankton
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DOI：
10.1111/oik.06060
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发表时间：
2019-04
期刊：
影响因子：
3.4
通讯作者：
Leah Lewington-Pearce;Anita Narwani;Mridul K. Thomas;Colin T. Kremer;Helena Vogler;P. Kratina
中科院分区：
文献类型：
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作者：
Leah Lewington-Pearce;Anita Narwani;Mridul K. Thomas;Colin T. Kremer;Helena Vogler;P. Kratina
资源竞争理论是一个概念框架，它提供了对具有不同资源需求的物种的竞争和群落组装的机制见解。然而，很少有人探索资源需求如何取决于其他环境因素，包括温度。受环境温度影响的资源需求变化意味着气候变暖可以改变竞争和社区聚集的结果。我们通过实验证明，环境温度改变了六种分布广泛的不同分类类群的浮游植物的最低光和氮需求以及其他生长参数。我们发现，物种在最高温度下需要最多的氮，而在中等温度下对光的需求往往最低，尽管在这种关系的确切形状上存在实质性的种间差异。我们还通过实验参数化了两个竞争模型，我们使用这两个模型来说明温度如何通过其对物种特征的影响，改变多物种组合中的竞争等级，决定群落动态。发展对温度如何影响争夺有限资源能力的机制理解，是改善气候变暖下群落动态预测的关键一步。435nm和685nm。我们用620nm和665nm的激发和发射波长测量藻蓝蛋白。实验单元是用Breathe-Easy™膜密封的组织培养板，以防止蒸发损失和相邻孔之间的交叉污染。为了降低污染的风险，所有驯化和实验接种步骤都在层流罩中使用无菌技术进行。放慢了
Resource competition theory is a conceptual framework that provides mechanistic insights into competition and community assembly of species with different resource requirements. However, there has been little exploration of how resource requirements depend on other environmental factors, including temperature. Changes in resource requirements as influenced by environmental temperature would imply that climate warming can alter the outcomes of competition and community assembly. We experimentally demonstrate that environmental temperature alters the minimum light and nitrogen requirements – as well as other growth parameters – of six widespread phytoplankton species from distinct taxonomic groups. We found that species require the most nitrogen at the highest temperatures while light requirements tend to be lowest at intermediate temperatures, although there are substantial interspecific differences in the exact shape of this relationship. We also experimentally parameterize two competition models, which we use to illustrate how temperature, through its effects on species’ traits, alters competitive hierarchies in multispecies assemblages, determining community dynamics. Developing a mechanistic understanding of how temperature influences the ability to compete for limiting resources is a critical step towards improving forecasts of community dynamics under climate warming. 435nm and 685nm. We measured the phycocyanin using excitation and emission wavelength of 620nm and 665nm. Experimental units were tissue-culture plates that were sealed with Breathe-Easy™ membranes to prevent evaporative losses and cross-contamination between adjacent wells. To reduce the risk of contamination, all acclimation and experimental inoculation steps were performed in a laminar flow hood using sterile technique. Well-A