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首页> 外文期刊>Harmful Algae >The influence of bloom intensity on the encystment rate and persistence of Alexandrium minutum in Cork Harbor, Ireland
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The influence of bloom intensity on the encystment rate and persistence of Alexandrium minutum in Cork Harbor, Ireland

机译：开花强度对爱尔兰软木港亚历山大藻的包囊率和持久性的影响

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摘要

Toxic Alexandrium minutum blooms recur annually in Cork Harbor, Ireland where they initiate in an inlet known as the North Channel. The dynamics of these blooms have been studied since 2003, and a high degree of inter-annual variability in the cell densities has been observed. Two intense blooms, with maximum cell densities ＞500,000 cells L~(-1), were observed in the summers of 2004 and 2011. Annual cyst surveys during winter found that cyst densities decreased after the 2004 bloom, and by 2010 an average of ca. 40 cysts g dry wt sediment~(-1) was recorded. The intensity of blooms was found to be independent of the cyst density measured the previous winter. The cyst input to the sediment during both intense and low density blooms was measured directly through the deployment of sediment traps in the North Channel. The data allowed an estimate of the proportion of the A minutum vegetative cells that underwent successful encystment, which averaged at 2.5% across a range of cell densities spanning three orders of magnitude. Maturation times of fresh cysts were determined at 5, 10 and 15 ℃. The maturation time at 15 ℃ was found to be approximately 5 months, a value which increased by two months for a 5° decrease in temperature. A cyst dynamics model was constructed based on the field data to simulate the temporal variation of A minutum cysts in the oxic layer of sediment. It revealed that a degree of resuspension is required to prevent cyst stocks from becoming exhausted in the thin oxic layer at the surface of the sediment. The model also demonstrated that the cysts supplied by periodic intense blooms, which occur with a frequency of every 7-8 years, are not in themselves enough to allow the population to persist over long time scales (decades). The cyst input from interim blooms of lower density is however enough to ensure the annual inoculation of the water column with A minutum cells.
机译：有毒亚历山大藻每年在爱尔兰的科克港重复开花，并从一个称为北海峡的入口开始。自2003年以来，已经研究了这些水华的动力学，并且观察到了细胞密度的高度年际变化。在2004年和2011年夏季，观测到两次强烈的水华，最大细胞密度＞ 500,000个细胞L〜（-1）。冬季的年度囊肿调查发现，2004年水华后囊肿密度下降，到2010年平均约。记录到40个囊肿g干wt沉积物〜（-1）。发现水华的强度与前一个冬天测得的囊肿密度无关。直接在北河道中通过沉积物捕集器的部署来直接测量密集和低密度水华期间沉积物中的囊肿输入。数据可以估计成功包囊的A最小营养细胞的比例，在横跨三个数量级的一系列细胞密度范围内，平均比例为2.5％。新鲜囊肿的成熟时间在5、10和15℃下确定。发现在15℃的成熟时间约为5个月，温度降低5°时，该值增加两个月。基于野外数据建立了囊肿动力学模型，以模拟沉积物含氧层中微小囊肿的时间变化。结果表明，需要一定程度的重悬浮，以防止囊肿储备在沉积物表面的薄氧化层中耗尽。该模型还表明，周期性强烈开花所提供的囊肿（每7-8年发生一次）本身不足以使种群长期维持（数十年）。但是，来自密度较低的临时开花的囊肿输入足以确保每年用A最小细胞接种水柱。

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  • 来源
    《Harmful Algae》 |2014年第1期|114-124|共11页
  • 作者

    Sarah Cosgrove; Aoife Ni Rathaille; Robin Raine;

  • 作者单位

    The Martin Ryan Building, National University of Ireland, Galway, University Road, Galway, Ireland;

    The Ryan Institute, National University of Ireland, Galway, Ireland;

    The Ryan Institute, National University of Ireland, Galway, Ireland,Earth and Ocean Sciences, School of Natural Science, National University of Ireland, Galway, Ireland;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Alexandrium; Bloom dynamics; Cyst stocks; Encystment rate; Ireland;

    机译：亚历山大;布鲁姆动力;囊肿库存;包囊率;爱尔兰;

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