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首页> 外文期刊>Marine ecology >Why do certain species dominate? What we can learn from a rare case of Microdictyon dominance on a Caribbean reef
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Why do certain species dominate? What we can learn from a rare case of Microdictyon dominance on a Caribbean reef

机译：为什么某些物种占主导地位？我们可以从罕见的Microdictyon占主导地位学习的东西

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摘要

Many Caribbean reefs have shifted from coral dominance to macroalgal dominance, often by brown algae such asDictyotaandLobophora. However, the north side of Cayman Brac in the Cayman Islands is dominated seasonally by the green macroalgaMicrodictyon(percent cover ofMicrodictyonis 4% in the winter and similar to 40% of the reef in the summer), although it is absent from the south side of the island and the remainder of the country. Indeed,Microdictyonis rare in much of the Caribbean, so this situation on Cayman Brac provides an opportunity to investigate the conditions that facilitate its distribution and dominance. The impact of herbivory, competition, nutrient input and other abiotic conditions were examined as factors that could influence the distribution and dominance ofMicrodictyon. While herbivory or nutrient input are frequently found to be key drivers of benthic community composition on coral reefs, here consumption ofMicrodictyonby herbivores was low, and thus, the alga was not subject to strong top-down control by herbivory. So, in this case, neither herbivore abundance nor feeding preference appeared to influence the distribution ofMicrodictyon. Nutrient input was also similar to both sides of the island suggesting nutrients played little role in differential distribution. But, in a controlled transplant experiment whereMicrodictyonwas protected from herbivory and competition, it experienced almost complete mortality (93.3%) when transplanted to the south side, compared to only 11.8% mortality on the north. The south side was exposed to the strongest wave action 92% of the days in our study and was on average a slight, but significant 0.2 degrees C warmer. Thus, these data suggest physical forcing (i.e. wave exposure) is the most likely factor dictatingMicrodictyondistribution. Conversely, a combination of reduced herbivory and increased competitive strength may explain the seasonal dominance ofMicrodictyonon the north side of Cayman Brac.Microdictyonwas a competitive inferior to the other common algae in winter but increased in competitive strength to equal other species in summer. These results add to the literature onMicrodictyonand on the forces impacting benthic community structure of coral reefs.
机译：许多加勒比珊瑚礁从珊瑚统治地转移到大型统治地位，通常由棕色藻类如粗糙的大床。然而，开曼群岛的开曼群岛的北侧由绿色大型巨大喹甲蛋白（冬季4％的百分比4％）季节性化季节性化，虽然南侧不存在于夏天的珊瑚礁的40％岛上和剩下的国家。实际上，微摩托尼斯在大部分加勒比地区都很罕见，因此开曼BRAC的这种情况提供了调查其促进其分配和优势的条件的机会。检查草药，竞争，营养投入和其他非生物疾病的影响被检查为可能影响Microdictyon的分布和占优势的因素。虽然经常被发现草药或营养投入是珊瑚礁上底栖群落组成的关键驱动因素，但在这里消耗蒙癌素来自食草动物的消耗量低，因此，藻类不受草食性的强大自上而下控制。因此，在这种情况下，既不似乎也没有喂养的偏好影响霉菌的分布。营养投入也类似于岛的两侧，暗示营养素在差分分布中发挥着小的作用。但是，在受控的移植实验中，在移植到南侧时，它在移植到南侧时，它几乎完全死亡（93.3％），而北方的死亡率仅为11.8％。南侧暴露于我们研究中的最强烈的波浪动作92％，平均略有，但大幅度的0.2度C。因此，这些数据表明物理强制（即波浪曝光）是最有可能的因素决定了MICRODICTYSIBURE。相反，降低食草动物和增加的竞争力量的组合可以解释Mayman Brac.Microdictyonwas的北侧Microdictyonon的季节性主导地位。冬季其他常见藻类的竞争性差异，但夏季等同于其他物种的竞争力量增加。这些结果为文献onmicrodictyonand造成了影响珊瑚礁底栖群落结构的力量。

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  • 来源
    《Marine ecology》 |2020年第5期|e12613.1-e12613.12|共12页
  • 作者

    Dell Claire L. A.; Longo Guilherme O.; Manfrino Carrie; Burkepile Deron E.;

  • 作者单位

    Cent Caribbean Marine Inst Princeton NJ USA|Univ Calif Santa Barbara Marine Sci Inst Santa Barbara CA 93106 USA;

    Univ Fed Rio Grande do Norte Dept Oceanog & Limnol Marine Ecol Lab Natal RN Brazil;

    Cent Caribbean Marine Inst Princeton NJ USA;

    Univ Calif Santa Barbara Marine Sci Inst Santa Barbara CA 93106 USA|Univ Calif Santa Barbara Dept Ecol Evolut & Marine Biol Santa Barbara CA 93106 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    competition; herbivory; macroalgae; nutrients; wave action;

    机译：竞争;草本;宏观格子;营养素;波动动作;

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