Variability approaching the thermal limits can drive diatom community dynamics
Variability approaching the thermal limits can drive diatom community dynamics
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DOI：
10.1002/lno.11430
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发表时间：
2020-09-01
影响因子：
4.5
通讯作者：
Rynearson, Tatiana A.
中科院分区：
文献类型：
--
作者：
Anderson, Stephanie I.;Rynearson, Tatiana A.
有机体分布在很大程度上是由温度介导的，这表明热性状变异在定义物种的生态位中起着关键作用。我们采用了一种基于性状的方法，以更好地了解如何间和种内的热性状变异可以解释硅藻群落动态使用24株5种硅藻属的硅藻，分离自纳拉甘塞特湾（NBay），在该属可以包括高达99%的微型浮游生物。使用在-2 ° C至36 ° C范围内的温度下获得的生长速率产生菌株特异性热反应标准。热反应规范的比较显示，种间和种内的相似性，在热最佳，但显着差异接近热极限。细胞的元素组成，确定了两个热分化的物种，并再次，最多的变化发生接近热极限。为了确定种间变异对群落组成的潜在影响，物种演替模型，制定利用每个物种的经验确定的热反应规范和历史温度数据从NBay。模拟群落的季节演替与野外物种发生的时间相似，但与物种的相对丰度不同。该模型正确地预测了占主导地位的冬春季物种的时间，Marinoi，在0-14天内，其观察到的峰值发生在外地。种间变异接近热极限提供了一种替代机制的时间硅藻演替，导致改变细胞元素组成，从而有可能影响碳通量和养分循环，这表明接近热极限的增长纳入经验和建模工作在未来。
Organismal distributions are largely mediated by temperature, suggesting thermal trait variability plays a key role in defining species' niches. We employed a trait-based approach to better understand how inter- and intraspecific thermal trait variability could explain diatom community dynamics using 24 strains from 5 species in the diatom genusSkeletonema, isolated from Narragansett Bay (NBay), where this genus can comprise up to 99% of the microplankton. Strain-specific thermal reaction norms were generated using growth rates obtained at temperatures ranging from -2 degrees C to 36 degrees C. Comparison of thermal reaction norms revealed inter- and intraspecific similarities in the thermal optima, but significant differences approaching the thermal limits. Cellular elemental composition was determined for two thermally differentiated species and again, the most variation occurred approaching the thermal limits. To determine the potential impact of interspecific variability on community composition, a species succession model was formulated utilizing each species' empirically determined thermal reaction norm and historical temperature data from NBay. Seasonal succession in the modeled community resembled the timing of species occurrence in the field, but not species' relative abundance. The model correctly predicted the timing of the dominant winter-spring species,Skeletonema marinoi, within 0-14 d of its observed peak occurrence in the field. Interspecific variability approaching the thermal limits provides an alternative mechanism for temporal diatom succession, leads to altered cellular elemental composition, and thus has the potential to influence carbon flux and nutrient cycling, suggesting that growth approaching the thermal limits be incorporated into both empirical and modeling efforts in the future.