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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Phenotypic plasticity of the coral Porites rus: Acclimatization responses to a turbid environment
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Phenotypic plasticity of the coral Porites rus: Acclimatization responses to a turbid environment

机译：珊瑚多孔体的表型可塑性：对浑浊环境的适应性反应

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摘要

Increasing terrestrial runoff due to anthropogenic activities has become a major problem for coral reef ecosystems around the world. Turbidity due to runoff can reduce light availability (via nutrient enrichment and sedimentation) and influence the biology and ecology of coral reefs. In this study, we explored the physiology and acclimatization potential of Porites rus, a morphologically variable reef-building coral that is common in Moorea, French Polynesia, and a species that thrives across turbidity gradients driven by proximity to terrestrial runoff. We compared tissue biomass, Symbiodinium identity, Symbiodinium density, chlorophyll concentrations, and stable isotope ratios in plating and branching areas of colonies sampled in turbid and non-turbid environments. A reciprocal transplant experiment (RTE) was also employed to compare the acclimatization capacity of P.rus from turbid and non-turbid environments. Our results indicate that the physiological differences between plating and branching regions within individual colonies of P. rus are greater than those of colonies from turbid and non-turbid environments. Plating regions of colonies had larger tissue biomasses than branching areas, regardless of environment. Plating regions also had higher chlorophyll concentrations than branching regions at the non-turbid site. The densities and genetic identity of Symbiodinium were the same at both sites. At the turbid site, δ~(13)C signatures were lower in plating than branching regions of the colony, suggesting they exhibit different rates of photosynthesis and/or capacity for heterotrophy. δ~(15)N were similar across sites and between morphologies, indicating that colonies from both sites were feeding at similar trophic levels and utilizing similar nitrogen sources. The RTE showed that P. rus acclimatizes differently when transplanted to the turbid and non-turbid environments. Corals from the non-turbid site grew less when transplanted to the turbid site, whereas corals from the turbid site showed no change in growth regardless of transplant location. Coral fragments transplanted to the non-turbid site, had lower levels of chlorophyll per tissue area than fragments transplanted to the turbid site, most likely reflecting the higher light levels at this site. Thus, our results demonstrate that there is significant variation in the physiology of P.rus at the colony level (branching vs. plate regions) and at the site level (turbid vs. non-turbid) and that this species can acclimatize to changes in environmental conditions on short time scales (weeks). This acclimatization potential may play an important role in enabling this coral species to diversify strategies for energy acquisition within the colony and facilitate persistence in turbid environments.
机译：人为活动引起的地表径流增加已成为全球珊瑚礁生态系统的主要问题。径流引起的浑浊会减少光的利用率（通过营养物富集和沉积），并影响珊瑚礁的生物学和生态。在这项研究中，我们探索了Porites rus的生理学和驯化潜力，Porites rus是一种形态多样的造礁珊瑚，在法属波利尼西亚的莫雷阿岛很常见，并且该物种在接近地表径流的情况下可以通过浊度梯度繁衍。我们比较了在浑浊和非浑浊环境中采样的菌落的平铺和分支区域中的组织生物量，共生素身份，共生素密度，叶绿素浓度和稳定的同位素比。还进行了相互移植实验（RTE），比较了混浊和非混浊环境中P.rus的适应能力。我们的结果表明，P。rus单个菌落的铺板区和分支区之间的生理差异要大于混浊和非混浊环境中菌落的菌落差异。不论环境如何，菌落的电镀区域都比分支区域具有更大的组织生物量。电镀区域的叶绿素浓度也高于非混浊部位的分支区域。两个部位的共生素的密度和遗传同一性均相同。在浑浊的位点，平板中的δ〜（13）C信号低于菌落的分支区域，表明它们显示出不同的光合作用速率和/或异养能力。 δ〜（15）N在位点之间和形态之间相似，表明两个位点的菌落都以相似的营养水平和利用相似的氮源为食。 RTE显示，当被移植到混浊和非混浊的环境中时，P。rus的适应能力有所不同。来自非浑浊部位的珊瑚在移植到浑浊部位时生长较少，而来自浑浊部位的珊瑚无论移植位置如何均未显示生长变化。移植到非浑浊部位的珊瑚碎片的每组织面积叶绿素水平低于移植到浑浊部位的碎片，这很可能反映了该部位较高的光照水平。因此，我们的结果表明，在菌落水平（分支vs.平板区域）和位点水平（浑浊vs.非浑浊），P.rus的生理存在显着变化，并且该物种可以适应短时间范围（周）的环境条件。这种适应环境的潜力可能在使该珊瑚物种多样化在殖民地内获取能量的策略以及促进在浑浊环境中的持久性方面发挥重要作用。

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    Jacqueline L. Padilla-Gamino; Katharine M. Hanson; Michael Stat; Ruth D. Gates;

  • 作者单位

    Hawaii Institute of Marine Biology, University of Hawaii, 46-007 Lilipuna Rd., Kaneohe 96744, USA,Department of Ecology, Evolution and Marine Biology, UC Santa Barbara, Santa Barbara, CA 93106, USA;

    American Museum of Natural History, Center for Biodiversity and Conservation, Central Park West at 79th Street, New York, NY 10024, USA;

    Hawaii Institute of Marine Biology, University of Hawaii, 46-007 Lilipuna Rd., Kaneohe 96744, USA,The UWA Oceans Institute and the Centre for Microscopy, Characterisation and Analysis, The University of Western Australia, 35 Stirling Highway Crawley, WA 6009, Australia,The Australian Institute of Marine Science, The University of Western Australia, 35 Stirling Highway Crawly, WA 6009, Australia,CSIRO Marine and Atmospheric Research, Private Mail Bag 5, Wembley, WA 6913, Australia;

    Hawaii Institute of Marine Biology, University of Hawaii, 46-007 Lilipuna Rd., Kaneohe 96744, USA;

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  • 正文语种 eng
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  • 关键词

    acclimatization; intra-colony variation; light; morphology; physiological flexibility; sediments;

    机译：适应菌落内变异光;形态学;生理弹性;沉积物;

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