Post-doctoral researcher in Scientific and Technological Bioresource Nucleus (BIOREN), Universidad de La Frontera, Temuco, Chile.
Núcleo Milenio MASH, Instituto de Ciencias Ambientales y Evolutivas, Universidad Austral de Chile, Valdivia, Chile.
J Phycol. 2023 Aug;59(4):712-724. doi: 10.1111/jpy.13343. Epub 2023 Jun 9.
The coastline is a heterogeneous and highly dynamic environment influenced by abiotic and biotic variables affecting the temporal stability of genetic diversity and structure of marine organisms. The aim of this study was to determine how much the genetic structure of four species of marine Bangiales vary in time and space. Partial sequences of the cytochrome oxidase I (COI) gene obtained from two Pyropia (Py. sp. CHJ and Py. orbicularis) and two Porphyra (P. mumfordii and P. sp. FIH) species were used to compare the effect of the 40° S/41° S biogeographic break (spatial-regional scale) and the one of the Valdivia River discharges (spatial-local scale) and determine their temporal stability. Four seasonal samplings were taken during 1 year at five sites, one site located in Melinka (Magallanes province) and four sites along the coast of Valdivia (Intermediate area), on both sides of the river mouth. Results showed a strong genetic spatial structure at regional scale (ΦST > 0.4) in Py. sp. CHJ, Py. orbicularis, and P. mumfordii, congruent with the 41° S/42° S biogeographic break. A potential barrier to gene flow, related to the Valdivia River discharge, was detected only in P. mumfordii. In P. sp. FIH, spatial genetic structure was not detected at any scale. The genetic structure of all four species is stable throughout the year. The potential effect of main currents and river discharge in limiting the transport of Bangiales spores are discussed. We propose that both a restricted propagule dispersal and the formation potential for persistent banks of microscopic stages could lead to a temporally stable spatial partitioning of genetic variation in bladed Bangiales.
海岸线是一个不均匀且高度动态的环境，受影响生物和非生物变量影响，影响海洋生物遗传多样性和结构的时间稳定性。本研究的目的是确定四种海洋 Bangiales 物种的遗传结构在时间和空间上的变化程度。从两个 Pyropia（Py. sp. CHJ 和 Py. orbicularis）和两个 Porphyra（P. mumfordii 和 P. sp. FIH）物种中获得的细胞色素氧化酶 I（COI）基因的部分序列用于比较 40° S/41° S 生物地理分界线（空间-区域尺度）和瓦尔迪维亚河排放量（空间-局部尺度）的影响，并确定它们的时间稳定性。在 1 年内的四个季节，在五个地点进行了四次采样，一个地点位于梅linka（马加拉内斯省），四个地点位于瓦尔迪维亚（中间区）沿海，在河口两岸。结果表明，在 Py. sp. CHJ、Py. orbicularis 和 P. mumfordii 中，存在强烈的遗传空间结构（区域尺度，ΦST>0.4），与 41° S/42° S 生物地理分界线一致。仅在 P. mumfordii 中检测到与瓦尔迪维亚河排放量有关的潜在基因流动障碍。在 P. sp. FIH 中，在任何尺度上都未检测到空间遗传结构。所有四个物种的遗传结构在整个一年中都是稳定的。讨论了主要海流和河流排放对 Bangiales 孢子运输的潜在影响。我们提出，受限的繁殖体传播和微观阶段的持久银行形成潜力可能导致 Blade Bangiales 遗传变异的时间稳定的空间划分。
