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Temperature and pathogen exposure act independently to drive host phenotypic trajectories
Biology Letters ( IF 3.3 ) Pub Date : 2021-06-16 , DOI: 10.1098/rsbl.2021.0072
Tobias E Hector 1 , Carla M Sgrò 1 , Matthew D Hall 1, 2
Affiliation  

Natural populations are experiencing an increase in the occurrence of both thermal stress and disease outbreaks. How these two common stressors interact to determine host phenotypic shifts will be important for population persistence, yet a myriad of different traits and pathways are a target of both stressors, making generalizable predictions difficult to obtain. Here, using the host Daphnia magna and its bacterial pathogen Pasteuria ramosa, we tested how temperature and pathogen exposure interact to drive shifts in multivariate host phenotypes. We found that these two stressors acted mostly independently to shape host phenotypic trajectories, with temperature driving a faster pace of life by favouring early development and increased intrinsic population growth rates, while pathogen exposure impacted reproductive potential through reductions in lifetime fecundity. Studies focussed on extreme thermal stress are increasingly showing how pathogen exposure can severely hamper the thermal tolerance of a host. However, our results suggest that under milder thermal stress, and in terms of life-history traits, increases in temperature might not exacerbate the impact of pathogen exposure on host performance, and vice versa.



中文翻译:

温度和病原体暴露独立地驱动宿主表型轨迹

自然种群正在经历热应激和疾病爆发的增加。这两种常见压力源如何相互作用以确定宿主表型变化对于种群持久性很重要,但无数不同的性状和途径是这两种压力源的目标,使得难以获得普遍预测。在这里,使用宿主大水蚤及其细菌病原体巴氏杆菌,我们测试了温度和病原体暴露如何相互作用以驱动多变量宿主表型的变化。我们发现这两种压力因素主要独立地影响宿主表型轨迹,温度通过有利于早期发育和增加内在人口增长率来推动更快的生活节奏,而病原体暴露通过降低终生繁殖力影响生殖潜力。专注于极端热应激的研究越来越多地表明病原体暴露如何严重阻碍宿主的热耐受性。然而,我们的结果表明,在较温和的热应激下,在生活史特征方面,温度升高可能不会加剧病原体暴露对宿主性能的影响,反之亦然。

更新日期:2021-06-16
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