Diversity and dynamics of a widespread bloom of the toxic dinoflagellate Alexandrium fundyense.
Diversity and dynamics of a widespread bloom of the toxic dinoflagellate Alexandrium fundyense.
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DOI：
10.1371/journal.pone.0022965
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发表时间：
2011
期刊：
影响因子：
3.7
通讯作者：
Anderson DM
中科院分区：
文献类型：
--
作者：
Erdner DL;Richlen M;McCauley LA;Anderson DM
从历史上看，世界各地的浮游植物物种被推定为在很大程度上代表无结构的种群。然而，最近研究遗传多样性的分子工具的发展揭示了不同地理尺度的浮游植物类群的差异，并为深入了解水华的生理学和生态学提供了洞察。在这里，我们描述了对2005年发生在缅因湾的有毒甲藻亚历山大藻大规模水华的遗传分析。这次水华以其强度和持续时间而闻名，覆盖了数百公里，持续了近两个月。基于微卫星标记数据的基因分型分析表明，美国东北部的开阔水域只有一个由两个不同的遗传亚群组成的区域种群。这些亚群是早花和晚花样品的特征，分别来自花期的北部和南部地区。在这项研究中观察到的时间变化为连续开花期间的演替提供了明确的证据，并表明选择可以在几周的时间尺度上作用于种群内显着改变基因型的表现。如果有性繁殖同样受到环境条件的影响，那么选择对种群组成和周转的影响将被放大。我们假设，不同的生长和繁殖率的综合影响有助于减少亚种群之间的基因流动，加强种群结构，同时保持整个区域种群的多样性。
Historically, cosmopolitan phytoplankton species were presumed to represent largely unstructured populations. However, the recent development of molecular tools to examine genetic diversity have revealed differences in phytoplankton taxa across geographic scales and provided insight into the physiology and ecology of blooms. Here we describe the genetic analysis of an extensive bloom of the toxic dinoflagellate Alexandrium fundyense that occurred in the Gulf of Maine in 2005. This bloom was notable for its intensity and duration, covering hundreds of kilometers and persisting for almost two months. Genotypic analyses based on microsatellite marker data indicate that the open waters of the northeastern U.S. harbor a single regional population of A. fundyense comprising two genetically distinct sub-populations. These subpopulations were characteristic of early- and late-bloom samples and were derived from the northern and southern areas of the bloom, respectively. The temporal changes observed during this study provide clear evidence of succession during a continuous bloom and show that selection can act on the timescale of weeks to significantly alter the representation of genotypes within a population. The effects of selection on population composition and turnover would be magnified if sexual reproduction were likewise influenced by environmental conditions. We hypothesize that the combined effects of differential growth and reproduction rates serves to reduce gene flow between the sub-populations, reinforcing population structure while maintaining the diversity of the overall regional population.
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影响因子：
2.9
作者：
Nagai, Satoshi;Lian, Chunlan;Hogetsu, Taizo
通讯作者：
Hogetsu, Taizo
影响因子：
2.8
作者：
GUILLARD, RR;RYTHER, JH
通讯作者：
RYTHER, JH
DOI：
10.1016/j.dsr2.2005.09.004
发表时间：
2005-01-01
影响因子：
3
作者：
Anderson, DM;Keafer, BA;Smith, KW
通讯作者：
Smith, KW
影响因子：
2.6
作者：
Excoffier, Laurent;Laval, Guillaume;Schneider, Stefan
通讯作者：
Schneider, Stefan
影响因子：
2.8
作者：
MARANDA, L;ANDERSON, DM;SHIMIZU, Y
通讯作者：
SHIMIZU, Y