Seagrasses provide important services to coastal ecosystems and mankind. Even though seagrasses have been seriously threatened in Europe from the 1970s, a recent study suggests that they are expanding in extension since the past few decades. Here, we add a new case to this reverse trend of seagrass decline, showing the resurgence of several patches of Zostera marina in the Ria de Aveiro lagoon. In the past, this seagrass disappeared on numerous occasions, especially due to dredging activities and its use for agricultural purposes. The last record of the species in the area was a decade ago, when small patches became extinct after a long period of heavy storms. Now, a decade later, nine patches of Z. marina were identified in the Mira channel, inhabiting a much wider area than that occupied prior to its extinction. Although in periods of low tide some patches were submerged in pools and others were exposed to the air, this fact did not cause differences in the eelgrass biometrics and flowering effort. All the patches formed several sexual spathes, suggesting that the eelgrass could form seed banks in the sediment. However, due to this species vulnerability to environmental changes and human activities, further studies are required to determine long-term reproductive success and survival in the Ria de Aveiro.

海草为沿海生态系统和人类提供重要服务。尽管从1970年代以来欧洲海草受到了严重威胁，但最近的一项研究表明，自从过去的几十年以来，海草的范围正在扩大。在这里，我们为这种海草下降的逆向趋势添加了一个新案例，显示了Ria de Aveiro泻湖中几处Zostera码头的死灰复燃。过去，这种海草无数次消失，特别是由于疏activities活动及其在农业上的用途。该地区该物种的最后记录是十年前，当时在长期暴风雨之后小片斑块已灭绝。现在，十年后，九个Z. marina码头在米拉海峡被发现，其居住面积比灭绝前的居住面积要大得多。尽管在退潮期间，有些斑块浸没在水池中，而另一些斑块则暴露在空气中，但这一事实并没有引起鳗草生物特征和开花力的差异。所有的斑块都形成了几个有性的裂隙，表明鳗草可以在沉积物中形成种子库。但是，由于该物种易受环境变化和人类活动的影响，因此需要进一步的研究以确定Ria de Aveiro地区的长期生殖成功和生存。