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首页> 外文期刊>Marine ecology progress series >Symbiodinium spp. in colonies of eastern Pacific Pocillopora spp. are highly stable despite the prevalence of low-abundance background populations
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Symbiodinium spp. in colonies of eastern Pacific Pocillopora spp. are highly stable despite the prevalence of low-abundance background populations

机译:共生菌属在东部太平洋Pocillopora spp的殖民地中。尽管背景人群数量很少,但仍保持高度稳定

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摘要

A shift in the dominant Symbiodinium species within a coral colony may allow rapid acclimatization to environmental stress, provided that the new symbiont is better suited to prevailing conditions. In this study, the Symbiodinium diversity in Pocillopora corals was examined following a cold-water bleaching event in the Gulf of California. Individual colonies were differentially impacted by this event based upon their association with either the Symbiodinium ITS-2 type Clb-c (sensitive) or ITS-2 type D1 (tolerant). Real-time PCR indicated a high prevalence of an alternate and compatible Symbiodinium sp. (i.e. Clb-c or D1) residing at low-abundance background levels within many colonies both during and after a 1 yr recovery interval (46 to 52%). However, despite the potential for 'switching,' the dominant resident symbiont remained at high abundance during the recovery, with only 2 of 67 colonies (3%) undergoing a change to the other Symbiodinium type. Pocillopora residing in the Gulf of California therefore maintain long-term associations dominated by a specific Symbiodinium sp., where potential competition by a second symbiont type is suppressed despite the temporary change in environmental conditions that would favor a shift in symbiosis toward a more stress-tolerant species.
机译:只要新的共生体更适合当前条件,珊瑚群落中优势共生菌种的转移就可以使环境适应环境压力。在这项研究中,在加利福尼亚湾发生冷水漂白事件之后,对Pocillopora珊瑚中的共生生物多样性进行了检查。基于单个菌落与Symbiodinium ITS-2型Clb-c(敏感)或ITS-2型D1(耐受)的关联,其受此事件的影响不同。实时荧光定量PCR表明,另一种和兼容的Symbiodinium sp。的流行率很高。 (即Clb-c或D1)在1年的恢复间隔期间和之后(46%至52%)处于许多菌落内的低丰度背景水平。然而,尽管具有“转换”的潜力,但主要的常驻共生菌在恢复过程中仍保持高丰度,只有67个菌落中的2个(3%)经历了另一种共生菌素类型的改变。因此,居住在加利福尼亚湾的Pocillopora保持着长期的联系,这些联系以特定的共生菌属为主,尽管环境条件的暂时变化有利于将共生关系转向压力更大的环境,但第二种共生菌类型的潜在竞争受到抑制。耐受物种。

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