Eelgrass (Zostera marina L.), an underwater marine flowering plant, has a high degree of morphological plasticity that allows it to survive and adapt to environmental changes. To test the effect of eelgrass genetic diversity (measured as allelic richness and observed heterozygosity) on resilience to stresses associated with eutrophication, eelgrass from ten genetically differentiated populations was studied in outdoor mesocosms. In a full factorial experiment lasting 3 months, eelgrass was subjected to two light levels (100 and 58% ambient) and two sediment treatments (1 and 8% organic content). Some populations of eelgrass showed higher resilience, measured as a combination of productivity and survival, when exposed to the stress of high sediment organic matter and, to a lesser extent, reduced light. Overall, eelgrass resilience correlated positively with eelgrass source population genetic diversity. The findings show that eelgrass resilience to stress typical of eutrophic estuaries (low light, high organic sediment) is improved by genetic diversity, with implications for transplantation, conservation, and management.

中文翻译：

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鳗草的遗传多样性影响对富营养化胁迫的适应力

鳗草（Zostera码头L.）是一种水下海洋开花植物，具有高度的形态可塑性，可以生存并适应环境变化。为了测试鳗草的遗传多样性（以等位基因丰富度和观察到的杂合度衡量）对与富营养化相关的胁迫的抵御力的影响，在室外中观研究了十个遗传分化种群的鳗草。在历时3个月的充分因子分析实验中，鳗gra接受了两次光照（100和58％的环境光）和两次沉淀物处理（1和8％的有机物含量）。当暴露于高沉积物有机质的压力下，并且在较小程度上减少光的照射下，一些鳗草种群显示出较高的复原力，这是生产力和生存能力的组合。总体，鳗草的复原力与鳗草来源种群的遗传多样性呈正相关。研究结果表明，鳗鱼草对富营养化河口（弱光，高有机沉积物）典型的胁迫的抵抗力通过遗传多样性得到改善，这对于移植，保护和管理具有重要意义。