Seagrass meadows are influenced by anthropogenic activities occurring in the littoral, generally resulting in an intense regression in the last decades. This study examines the evolution of the Z. noltei coverage from 1989 to 2014 in two seagrass meadows located in the Ría de Vigo (Arcade and A Ramallosa), subjected to different degrees of coastline alteration, anthropogenic land cover, population growth and shellfishing activity. A spatial analysis of the distribution of Z. noltei was carried out using aerial photographs from 1989, 2004 and 2014 and field surveys. The results obtained showed that in Arcade, a meadow characterized by low watershed-scale anthropogenic pressure and absence of shellfishing on the seagrass, the Z. noltei coverage decreased by 48 % in the studied period. By contrast, in A Ramallosa, a meadow characterized by moderately watershed-scale anthropogenic pressure and presence of shellfishing on the seagrass, the Z. noltei coverage increased by 56%. The observed increase of Z. noltei coverage in A Ramallosa appears to be related to the combined effect of increase of finer sediment loads and a decrease of bivalve harvesting.

海草草甸受沿海地区发生的人为活动的影响，通常导致最近几十年的强烈退化。这项研究调查了1989年至2014年间Z. noltei覆盖率在维加河（Arcade和A Ramallosa）上的两个海草草地上的演变过程，这些草地受到了不同程度的海岸线变化，人为土地覆盖，人口增长和贝类活动的影响。使用1989年，2004年和2014年的航拍照片以及实地调查对No. Z.分布进行了空间分析。获得的结果表明，在Arcade上，流域尺度的人为压力低且海草Z. noltei没有贝类捕捞的特点在研究期间，覆盖率下降了48％。相比之下，在以分水岭规模的人为压力为特征并在海草上有贝类捕捞为特征的草甸拉马洛萨（A Ramallosa）中，诺氏梭菌的覆盖率增加了56％。观察到的南极野菜Z. noltei覆盖率的增加似乎与更细的泥沙量增加和双壳类收获物减少的综合影响有关。