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Genetic and morpho-physiological differentiation in a limpet population across an intertidal gradient
Helgoland Marine Research Pub Date : 2018-11-03 , DOI: 10.1186/s10152-018-0519-1
Jesús Darío Nuñez , Pedro Fernández Iriarte , Emiliano Hernán Ocampo , Enrique Madrid , Maximiliano Cledón

Marine organism adaptive capacity to different environmental conditions is a research priority to understand what conditions are important in structuring the spatial distribution of natural populations. In this context, this study evaluates whether potential differences in Siphonaria lessonii morphology (size and shell shape) and physiology (water loss regulation) at different shore heights are linked to genetically distinguishable individuals. To achieve this goal, we compared size-frequency distribution, morphometric, and genetic data (ISSR-PCR technique) of S. lessonii from the upper, middle and lower shore. We complemented these field samplings with laboratory experiments on water loss and mortality. Genetic analysis showed different genetic composition for individuals from the upper and lower shore. This pattern was accompanied by morpho-physiological variations: the upper shore had fewer small limpets, lower shell shape dispersion (with a morphotype characterized by a higher shell), and less water loss and mortality related to air exposure than the lower shore. The results reported herein support the idea that the extreme and unpredictable conditions of the upper shore may impose strong selection pressure on its inhabitants, leading to considerable morpho-physiological differentiation consistent with different genetic composition. This probably plays an important role in structuring the spatial distribution of natural S. lessonii populations with a possible effect on size-structure distribution.

中文翻译:

潮间带梯度上的帽贝种群的遗传和形态生理分化

海洋生物对不同环境条件的适应能力是研究的重点,以了解哪些条件对构建自然种群的空间分布至关重要。在这种情况下,本研究评估了在不同岸高处,虹吸管形态(大小和壳形)和生理学(失水调节)的潜在差异是否与遗传上可区分的个体相关。为了实现此目标,我们比较了来自上,中,下海岸的教训链球菌的大小频率分布,形态计量和遗传数据(ISSR-PCR技术)。我们通过水损失和死亡率的实验室实验对这些现场采样进行了补充。遗传分析表明,上岸和下岸个体的遗传组成不同。这种模式伴随着形态生理变化:与下岸相比,上岸具有较少的小帽贝,下壳形分散度较低(形态特征为更高的壳),与水暴露有关的水分流失和死亡率也较低。本文报道的结果支持这样的观点,即上岸的极端和不可预测的条件可能对其居民施加强大的选择压力,从而导致与不同遗传组成相一致的显着形态生理分化。这可能在构建自然链球菌种群的空间分布中起重要作用,可能对大小结构分布产生影响。与低空接触相比,与空气接触造成的失水和死亡率降低。本文报道的结果支持这样的观点,即上岸的极端和不可预测的条件可能对其居民施加强大的选择压力,从而导致与不同遗传组成相一致的显着形态生理分化。这可能在构建自然链球菌种群的空间分布中起重要作用,可能对大小结构分布产生影响。与低空接触相比,与空气接触造成的水分流失和死亡率降低。本文报道的结果支持这样的观点,即上岸的极端和不可预测的条件可能对其居民施加强大的选择压力,从而导致与不同遗传组成相一致的显着形态生理分化。这可能在构建自然链球菌种群的空间分布中起重要作用,可能对大小结构分布产生影响。导致与不同遗传组成相一致的显着形态生理分化。这可能在构建自然链球菌种群的空间分布中起重要作用,并可能影响大小结构分布。导致与不同遗传组成相一致的显着形态生理分化。这可能在构建自然链球菌种群的空间分布中起重要作用,可能对大小结构分布产生影响。
更新日期:2018-11-03
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