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首页> 外文期刊>Harmful Algae >Distribution, abundance and diversity of Gambierdiscus spp. from a ciguatera-endemic area in Marakei, Republic of Kiribati
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Distribution, abundance and diversity of Gambierdiscus spp. from a ciguatera-endemic area in Marakei, Republic of Kiribati

机译：Gambierdiscus spp的分布，丰度和多样性。来自基里巴斯共和国马拉基的雪茄流行地区

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摘要

Ciguatera is a serious seafood poisoning syndrome caused by the consumption of ciguatoxin-contaminated finfish from tropical and subtropical regions. This study examined the community structure of ciguatera-associated dinoflagellates and the distribution pattern, taxonomy and toxicity of Gambierdiscus spp. from a high-risk area of Marakei, Republic of Kiribati. The genera Gambierdiscus, Prorocentrum, Ostreopsis, Amphidinium and Coolia were present, and generally the former three dominated the dinoflagellate assemblage. Among these three, Gambierdiscus was the most abundant dinoflagellate genus observed at three of the four sites sampled, two of which (Sites 1 and 2) were on the northern half of the island and two (Sites 3 and 4) on the southern half. The following patterns of abundance were observed among sites: (1) Average Gambierdiscus spp. abundance at the northern sites exceeded the southern sites by a factor of 19-54; and (2) Gambierdiscus spp. abundance at shallow sites (2-3 m) exceeded deeper sites (10-15 m). The distribution of Gambierdiscus spp. at Marakei corresponded with previously observed patterns of fish toxicity, with fish from southern locations being much less toxic than fish sampled north of the central channel. DNA sequencing identified three Gambierdiscus species (Gambierdiscus carpenteri, Gambierdiscus belizeanus, Gambierdiscus pacificus) and three previously unreported ribotypes [Gambierdiscus sp. type 4, Gambierdiscus sp. type 5, Gambierdiscus sp. type 6) in the samples; Gambierdiscus sp. type 4 may represent a Pacific clade of Gambierdiscus sp. ribotype 1. Toxicity analyses determined that Gambierdiscus sp. type 4 isolates were more toxic than the Gambierdiscus sp. type 5 and G. pacificus isolates, with toxin contents of 2.6-6.0 (mean: 4.3 ± 1.4), 0.010 and 0.011 fg P-CTX-1 eq cell~(-1), respectively. Despite low densities of Gambierdiscus spp. observed at Marakei relative to other studies in other parts of the world, the presence of low and moderately toxic populations may be sufficient to render the western coast of Marakei a high-risk area for ciguatera. The long history of toxicity along the western side of Marakei suggests that large-scale oceanographic forcings that regulate the distribution of Gambierdiscus spp. along the western side of Marakei may have remained relatively stable over that time. Chronic as well as acute exposure to ciguatoxins may therefore pose an important human health impact to the residents of Marakei.
机译：Ciguatera是一种严重的海鲜中毒综合症，原因是食用热带和亚热带地区受Ciguatox污染的有鳍鱼类。这项研究审查了与雪茄相关的鞭毛虫的群落结构以及甘比氏菌属的分布模式，分类学和毒性。来自基里巴斯共和国马拉基的高风险地区。存在冈比亚属，原中心，骨质疏松症，两栖类和库里亚属，并且通常前三类占优势鞭毛体。在这三个地点中，冈比亚鞭毛虫是在采样的四个地点中的三个地点观察到的最丰富的鞭毛藻属，其中两个（地点1和2）位于岛的北半部，两个地点（地点3和4）在南半部。在站点之间观察到以下丰度模式：（1）平均Gambierdiscus spp。北部地区的丰度比南部地区高19-54倍； （2）Gambierdiscus spp。浅处（2-3 m）的丰度超过深处（10-15 m）。 Gambierdiscus spp的分布。马拉基（Marakei）的鱼类与先前观察到的鱼类毒性模式相对应，南部地区的鱼类比中央通道北部的鱼类毒性要低得多。 DNA测序确定了三种甘比氏菌（Gambierdiscus carpenteri，Gambierdiscus belizeanus，Gambierdiscus pacificus）和三种以前未报道的核糖型[Gambierdiscus sp。类型4，Gambierdiscus sp。类型5，Gambierdiscus sp。样本中的类型6）； Gambierdiscus sp。 4型可能代表Gambierdiscus sp。的太平洋进化枝。核糖型1。毒性分析确定该Gambierdiscus sp。 4型分离物比Gambierdiscus sp。具有更高的毒性。 5型和G.pacificus分离株，毒素含量分别为2.6-6.0（平均值：4.3±1.4），0.010和0.011 fg P-CTX-1 eq细胞〜（-1）。尽管Gambierdiscus spp的密度低。相对于世界其他地区的其他研究，在马拉基（Marakei）观察到，低毒性和中等毒性种群的存在可能足以使马拉基（Marakei）西部海岸成为西瓜特拉的高风险地区。马拉基（Marakei）西侧的悠久毒性历史表明，大规模的海洋强迫作用调节了甘比氏菌的分布。在这段时间里，马拉基（Marakei）西侧的沿线可能一直保持相对稳定。因此，慢性以及急性接触雪茄毒素可能会对马拉基居民造成重大的人类健康影响。

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  • 来源
    《Harmful Algae》 |2014年第4期|56-68|共13页
  • 作者

    Yixiao Xu; Mindy L. Richlen; Steve L. Morton; Yim Ling Mak; Leo Lai Chan; Aranteiti Tekiau; Donald M. Anderson;

  • 作者单位

    School of Geographical and Oceanographic Sciences, Nanjing University, Nanjing, Jiangsu 210093, PR China,Biology Department, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA;

    Biology Department, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA;

    NOAA/NOS, Marine Biotoxins Program, 219 Fort Johnson Road, Charleston, SC 29412, USA;

    State Key Laboratory in Marine Pollution, Research Centre for the Oceans and Human Health, City University of Hong Kong, Hong Kong Special Administrative Region;

    State Key Laboratory in Marine Pollution, Research Centre for the Oceans and Human Health, City University of Hong Kong, Hong Kong Special Administrative Region;

    Fisheries Division, Ministry of Fisheries & Marine Resources Development, Republic of Kiribati;

    Biology Department, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Ciguatera fish poisoning; Ciguatoxins; Gambierdiscus; Ostreopsis; HABs; Kiribati;

    机译：Ciguatera鱼中毒;西瓜毒素;Gambierdiscus;骨质疏松症;HAB;基里巴斯;

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