Eelgrass Genetic Diversity Influences Resilience to Stresses Associated with Eutrophication
Eelgrass Genetic Diversity Influences Resilience to Stresses Associated with Eutrophication
复制标题
大鳗草遗传多样性影响对富营养化相关压力的恢复能力
作者：
H. Plaisted;A. Novak;Sarah Weigel;A. Klein;F. Short
大叶藻（Zostera marina L.）是一种水下海洋开花植物，具有高度的形态可塑性，使其能够生存并适应环境变化。为了测试鳗草遗传多样性（以等位基因丰富度和观察到的杂合性来衡量）对富营养化相关压力恢复能力的影响，在室外中生态系统中对来自十个遗传分化群体的鳗草进行了研究。在持续 3 个月的全析因实验中，鳗草接受了两种光照水平（100% 和 58% 环境光）和两种沉积物处理（1% 和 8% 有机物含量）。当暴露于高沉积物有机质和较小程度的光照减少的压力时，一些鳗草种群表现出更高的恢复能力，以生产力和存活率的综合衡量。总体而言，鳗草的恢复力与鳗草来源群体的遗传多样性呈正相关。研究结果表明，遗传多样性提高了鳗草对富营养化河口典型压力（低光照、高有机沉积物）的抵抗力，这对移植、保护和管理具有影响。
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.