智利南部巴塔哥尼亚峡湾系统产毒甲藻亚历山大藻的遗传种群结构

Pub Date : 2020-08-14 DOI:10.22370/rbmo.2020.55.1.2356
Javier Paredes-Mella, D. Varela
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引用次数: 3

摘要

链状亚历山大藻是在智利南部形成有害藻类水华(HABs)的主要物种。自1972年在麦哲伦地区首次记录以来,该物种的分布范围从南到北明显增加。在本研究中,我们研究了范围扩展分布对连锁A.catenella种群遗传多样性和结构的影响。这是通过从麦哲伦和艾森地区不同地区分离33个克隆来实现的,这些克隆用扩增片段长度多态性(AFLP)分子标记进行了遗传表征。结果表明,从南到北种群在纬度上存在遗传多样性梯度。种群间的遗传差异很低,但在地理上相近和遥远的种群之间都很显著。结果表明,遗传多样性分化可能是由奠基者效应产生的,这在扩大分布范围的种群中是意料之中的。另一方面,遥远种群之间的低水平遗传差异似乎表明,高基因流发生在太平洋沿岸,但似乎也暗示了麦哲伦和艾森种群之间的连通路线,即种群之间的营养细胞分散,将发生在太平洋沿海海岸和瓜佛岛。最后,在更接近的艾森种群之间发现的多点连锁不平衡的高值表明,分化可能受到营养细胞繁殖动态的影响。
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Genetic population structure of the toxigenic dinoflagellate Alexandrium catenella in the Patagonian Fjords System, southern Chile
Alexandrium catenella is the main species that form harmful algae blooms (HABs) in southern Chile. Since its first record in 1972 in the Magallanes region this species apparently has increased its range distribution from south to north. In this study, we investigate the influence of the range expansions distribution on the A. catenella populations genetic diversity and structure. This was achieved by isolating 33 clones from different localities along the Magallanes and Aysen region which were genetically characterized with Amplified Fragment Length Polymorphism (AFLPs) molecular markers. Results showed a latitudinal genetic diversity gradient from the south to north populations. Inter-populations genetic divergences were low but significant between both geographically close and distant populations. Results indicated that the genetic diversity differentiation could be generated by a founder effect, which is expected in populations that have expanded their distribution range. On the other hand, low levels of genetic divergences between distant populations seems point out that high gene flow occurs along coast of the Pacific Ocean, but also, seems hints the connectivity route between the Magallanes and Aysen populations i.e. , the vegetative cells dispersion among populations, would occur through coastal Pacific coast and Boca del Guafo. Finally, the high values of multilocus linkage disequilibrium found between closer population of Aysen indicates that divergence could be influenced along with the reproductive dynamic of the vegetative cells.
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