Grupo de Pesquisa em Recifes de Corais e Mudanças Globais, Instituto de Geologia, Universidade Federal da Bahia, Rua Barão de Jeremoabo, s/n, Ondina, CEP 40170-115, Salvador, BA, Brazil; Programa de Pós-Graduação em Ecologia e Biomonitoramento - PPG ECOBIO - UFBA, Rua Barão de Jeremoabo, 147, Ondina, CEP 40170-290, Salvador, BA, Brazil.
Mar Pollut Bull. 2013 Dec 15;77(1-2):55-62. doi: 10.1016/j.marpolbul.2013.10.033. Epub 2013 Nov 11.
In Brazil, where reefs occur in markedly turbid environments, the relationship between sedimentation/organic matter and corals is poorly known. Thus, the ex situ effects of sediment with and without organic matter over the ΔF/Fm and physical state of Mussismilia braziliensis were analyzed. The ΔF/Fm and coral physical state, evaluated through the susceptibility index to sedimentation (SI), were measured in seven colonies exposed to sedimentation (0-450 mg cm(-2) day(-1)) free of organic matter after 45 days of exposure, and in 12 colonies exposed to sedimentation (0-500 mg cm(-2) day(-1)) with organic matter content (10%), in which case ΔF/Fm was measured after 72 h and SI after 120 h. In both cases there were effects of increasing sedimentation on the SI with no effect on ΔF/Fm. Despite the tolerance to high sedimentation rates shown by this coral, we noted that the presence of organic matter might reduce its tolerance to sedimentation stress.
在巴西，珊瑚礁生长于明显浑浊的环境中，人们对沉积物和有机物与珊瑚之间的关系知之甚少。因此，本研究分析了有无有机物存在时，沉积物对离体条件下 Mussismilia braziliensis 的 ΔF/Fm 和物理状态的影响。通过对沉降敏感性指数（SI）的评估，测定了在暴露于无有机物（0-450 mg cm(-2) day(-1)）的沉降条件下 45 天后的七个珊瑚虫群体，以及在暴露于有有机物（10%）（0-500 mg cm(-2) day(-1)）的 12 个珊瑚虫群体中的 ΔF/Fm 和珊瑚物理状态，在这两种情况下，分别在 72 小时和 120 小时后测量了 ΔF/Fm 和 SI。在这两种情况下，随着沉降量的增加，SI 均呈现出明显的变化，但对 ΔF/Fm 没有影响。尽管这种珊瑚对高沉降率具有耐受性，但我们注意到有机物的存在可能会降低其对沉降压力的耐受性。
