Heterotrophy mitigates the response of the temperate coral Oculina arbuscula to temperature stress.

Heterotrophy mitigates the response of the temperate coral Oculina arbuscula to temperature stress.
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DOI:
10.1002/ece3.2399
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发表时间:
2016-09
影响因子:
2.6
通讯作者:
Castillo, Karl D.
Castillo, Karl D.
中科院分区:
生物学2区
文献类型:
--
作者:
Aichelman, Hannah E.;Townsend, Joseph E.;Courtney, Travis A.;Baumann, Justin H.;Davies, Sarah W.;Castillo, Karl D.

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在1971年至2010年期间,大气二氧化碳浓度的人为增加导致全球平均海表温度每十年增加约0.11°C,预计这一趋势将持续到21世纪。大量研究表明,增加的SSTs通过降低宿主钙化和共生体密度以及其他变量,损害了珊瑚全息生物(刺胞宿主及其共生藻类)。然而,我们仍然不完全了解异养在珊瑚全息生物对温度升高的反应中的作用,特别是对于温带珊瑚。在此,我们进行了两个独立的实验,研究了异养对温带硬核珊瑚(Oculina arbuscula)对热胁迫反应的影响。在2005-2012年的平均海温(20°C)和平均夏季温度(28°C)两个独立的温度实验中,对北卡罗来纳州Radio岛的O. arbuscula菌落进行了四种摄食处理(零、低、中、高浓度新孵化的Artemia sp. nauplii),以量化异养对珊瑚骨骼生长和共生体密度的影响。结果表明,在28°C饲养的未喂食珊瑚中,异养减轻了骨骼生长的减少和共生体密度的减少。本研究强调了异养在维持热胁迫下珊瑚全息生物适应性方面的重要性,并对解释珊瑚对气候变化的响应具有重要意义。
Anthropogenic increases in atmospheric carbon dioxide concentration have caused global average sea surface temperature (SST) to increase by approximately 0.11°C per decade between 1971 and 2010 – a trend that is projected to continue through the 21st century. A multitude of research studies have demonstrated that increased SSTs compromise the coral holobiont (cnidarian host and its symbiotic algae) by reducing both host calcification and symbiont density, among other variables. However, we still do not fully understand the role of heterotrophy in the response of the coral holobiont to elevated temperature, particularly for temperate corals. Here, we conducted a pair of independent experiments to investigate the influence of heterotrophy on the response of the temperate scleractinian coral Oculina arbuscula to thermal stress. Colonies of O. arbuscula from Radio Island, North Carolina, were exposed to four feeding treatments (zero, low, moderate, and high concentrations of newly hatched Artemia sp. nauplii) across two independent temperature experiments (average annual SST (20°C) and average summer temperature (28°C) for the interval 2005–2012) to quantify the effects of heterotrophy on coral skeletal growth and symbiont density. Results suggest that heterotrophy mitigated both reduced skeletal growth and decreased symbiont density observed for unfed corals reared at 28°C. This study highlights the importance of heterotrophy in maintaining coral holobiont fitness under thermal stress and has important implications for the interpretation of coral response to climate change.
变暖和浸润性藻类对温带珊瑚礁建造者珊瑚的协同作用的实验证据。
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