Oxygen metabolic responses of three species of large benthic foraminifers with algal symbionts to temperature stress.
Oxygen metabolic responses of three species of large benthic foraminifers with algal symbionts to temperature stress.
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DOI：
10.1371/journal.pone.0090304
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发表时间：
2014
期刊：
影响因子：
3.7
通讯作者：
Hosono T
中科院分区：
文献类型：
--
作者：
Fujita K;Okai T;Hosono T
水温影响珊瑚礁环境中与藻类共生体大型底栖有孔虫 (LBF) 的生理机能。然而，LBF 全生物对其栖息地温度范围的详细生理反应尚不清楚。我们报告了三种 LBF 全生物（硅藻共生体的 Baculogypsina sphaerulata 和 Calcarina gaudichaudii，以及甲藻共生体 Amphisorus kudakajimensis）在实验室中测量的净氧 (O2) 产量和呼吸速率，水温范围为 5°C 至 45°C，间隔为 2.5°C 或 5°C，光饱和度为～500 µmol m−2 s−1。此外，还评估了暴露于温度胁迫后净氧气产量和呼吸速率的恢复情况。三种 LBF 全生物的净 O2 产量和呼吸速率在~30°C 时达到峰值，表明它们在短时间内暴露的最佳温度。在极端高温（≥40°C）下，所有三种LBF全生物的净O2生产率均下降至小于零，呼吸速率略有下降，表明藻类共生体的光合作用失活。在极端低温下（两种类蛔虫≤10°C，A. kudakajimensis≤5°C），净O2产量和呼吸速率接近于零，表明全生物活动减弱。暴露于极高或极低温度后，净O2生产率直到第二天才恢复，而呼吸率则迅速恢复，这表明与呼吸系统相比，温度应激对光系统的损害需要更长的时间（天）才能恢复。这些结果表明，LBF 全生物的氧代谢通常可以很好地应对栖息地中昼夜和季节性波动的条件。然而，高光水平下的短暂热和冷应激可能会对藻类共生体造成严重损害，也会对宿主有孔虫造成损害。
Water temperature affects the physiology of large benthic foraminifers (LBFs) with algal symbionts dwelling in coral reef environments. However, the detailed physiological responses of LBF holobionts to temperature ranges occurring in their habitats are not known. We report net oxygen (O2) production and respiration rates of three LBF holobionts (Baculogypsina sphaerulata and Calcarina gaudichaudii hosting diatom symbionts, and Amphisorus kudakajimensis hosting dinoflagellate symbionts) measured in the laboratory at water temperatures ranging from 5°C to 45°C in 2.5°C or 5°C intervals and with light saturation levels of ∼500 µmol m−2 s−1. In addition, the recovery of net O2 production and respiration rates after exposure to temperature stress was assessed. The net O2 production and respiration rates of the three LBF holobionts peaked at ∼30°C, indicating their optimal temperature for a short exposure period. At extreme high temperatures (≥40°C), the net O2 production rates of all three LBF holobionts declined to less than zero and the respiration rates slightly decreased, indicating that photosynthesis of algal symbionts was inactivated. At extreme low temperatures (≤10°C for two calcarinid species and ≤5°C for A. kudakajimensis), the net O2 production and respiration rates were near zero, indicating a weakening of holobiont activity. After exposure to extreme high or low temperature, the net O2 production rates did not recover until the following day, whereas the respiration rates recovered rapidly, suggesting that a longer time (days) is required for recovery from damage to the photosystem by temperature stress compared to the respiration system. These results indicate that the oxygen metabolism of LBF holobionts can generally cope well with conditions that fluctuate diurnally and seasonally in their habitats. However, temporal heat and cold stresses with high light levels may induce severe damage to algal symbionts and also damage to host foraminifers.
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DOI：
10.1111/j.1439-0485.1994.tb00059.x
发表时间：
1994-01-01
期刊：
Marine Ecology
影响因子：
--
作者：
Hohenegger, Johann
通讯作者：
Hohenegger, Johann
影响因子：
2.5
作者：
Momigliano, Paolo;Uthicke, Sven
通讯作者：
Uthicke, Sven
影响因子：
7.3
作者：
Jones, RJ;Hoegh-Guldberg, O;Schreiber, U
通讯作者：
Schreiber, U
影响因子：
3.7
作者：
Hill, R;Larkum, AWD;Ralph, PJ
通讯作者：
Ralph, PJ
DOI：
10.1016/j.jembe.2012.06.025
发表时间：
2012-11-01
影响因子：
2
作者：
Doo, Steve S.;Mayfield, Anderson B.;Fan, Tung-Yung
通讯作者：
Fan, Tung-Yung