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| DOI | 10.1242/jeb.246222 |
| Comparative physiology reveals heat stress disrupts acid-base homeostasis independent of symbiotic state in the model cnidarian Exaiptasia diaphana | |
| 发表日期 | 2024 |
| ISSN | 0022-0949 |
| EISSN | 1477-9145 |
| 起始页码 | 227 |
| 结束页码 | 4 |
| 卷号 | 227期号:4 |
| 英文摘要 | Climate change threatens the survival of symbiotic cnidarians by causing photosymbiosis breakdown in a process known as bleaching. Direct effects of temperature on cnidarian host physiology remain difficult to describe because heatwaves depress symbiont performance, leading to host stress and starvation. The symbiotic sea anemone Exaiptasia diaphana provides an opportune system to disentangle direct versus indirect heat effects on the host, as it can survive indefinitely without symbionts. We tested the hypothesis that heat directly impairs cnidarian physiology by comparing symbiotic and aposymbiotic individuals of two laboratory subpopulations of a commonly used clonal strain of E. diaphana, CC7. We exposed anemones to a range of temperatures (ambient, +2 degrees C, +4 degrees C and +6 degrees C) for 15-18 days, then measured their symbiont population densities, autotrophic carbon assimilation and translocation, photosynthesis, respiration and host intracellular pH (pHi). Symbiotic anemones from the two subpopulations differed in size and symbiont density and exhibited distinct heat stress responses, highlighting the importance of acclimation to different laboratory conditions. Specifically, the cohort with higher initial symbiont densities experienced dose-dependent symbiont loss with increasing temperature and a corresponding decline in host photosynthate accumulation. In contrast, the cohort with lower initial symbiont densities did not lose symbionts or assimilate less photosynthate when heated, similar to the response of aposymbiotic anemones. However, anemone pHi decreased at higher temperatures regardless of cohort, symbiont presence or photosynthate translocation, indicating that heat consistently disrupts cnidarian acid-base homeostasis independent of symbiotic status or mutualism breakdown. Thus, pH regulation may be a critical vulnerability for cnidarians in a changing climate. |
| 英文关键词 | KEY WORDS; Intracellular pH; Thermal stress; Aiptasia; Symbiosis; Climate change; Symbiodiniaceae |
| 语种 | 英语 |
| WOS研究方向 | Life Sciences & Biomedicine - Other Topics ; Zoology |
| WOS类目 | Biology ; Zoology |
| WOS记录号 | WOS:001175450900011 |
| 来源期刊 | JOURNAL OF EXPERIMENTAL BIOLOGY
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| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/286716 |
| 作者单位 | University of Pennsylvania |
| 推荐引用方式 GB/T 7714 | . Comparative physiology reveals heat stress disrupts acid-base homeostasis independent of symbiotic state in the model cnidarian Exaiptasia diaphana[J],2024,227(4). |
| APA | (2024).Comparative physiology reveals heat stress disrupts acid-base homeostasis independent of symbiotic state in the model cnidarian Exaiptasia diaphana.JOURNAL OF EXPERIMENTAL BIOLOGY,227(4). |
| MLA | "Comparative physiology reveals heat stress disrupts acid-base homeostasis independent of symbiotic state in the model cnidarian Exaiptasia diaphana".JOURNAL OF EXPERIMENTAL BIOLOGY 227.4(2024). |
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