Global challenges for seagrass conservation include increasing societal recognition of the importance of seagrass and assessing its distribution and status. We present the first characterization of a Halodule wrightii meadow in the Fernando de Noronha Archipelago, Brazil. The seagrass was registered in Sueste Bay, which is the most sheltered coastal environment of the archipelago and is also where the only mangrove on a Brazilian oceanic island is located. The mean shoot density was 6690 ± 2670 shoots.m⁻², the mean aboveground and belowground biomasses were 15.33 ± 8.46 gDW.m⁻² and 69.51 ± 61.65 gDWm⁻², respectively. Additionally, the mean leaf length and width were 7.7 ± 1.7 cm and 0.05 ± 0.02 mm, respectively. In Fernando de Noronha, H. wrightii is a food source for sea turtles and is probably the only seagrass population on the Northeastern coast that was not affected by the crude oil spill that reached the Brazilian coast in 2019. Our results represent an essential starting point for raising awareness about the importance of seagrass in one of the most important marine protected areas on the Brazilian coast.

海草保护的全球挑战包括，社会日益认识到海草的重要性，并评估其分布和状况。我们介绍了巴西费尔南多·迪诺罗尼亚群岛的Halodule wrightii草甸的第一个特征。海草在苏埃斯特湾注册，苏埃斯特湾是该群岛最受庇护的沿海环境，也是巴西大洋岛上唯一的红树林所在的地方。平均芽密度为6690±2670个芽.m ^-2，平均地上和地下生物量为15.33±8.46 gDW.m ^-2和69.51±61.65 gDWm ^-2， 分别。此外，平均叶片长度和宽度分别为7.7±1.7 cm和0.05±0.02 mm。在费尔南多·迪诺罗尼亚群岛，H。wrightii是海龟的食物来源，可能是东北海岸唯一不受2019年到达巴西海岸的原油泄漏影响的海草种群。我们的结果代表了一个重要的起点旨在提高人们对巴西海岸最重要的海洋保护区之一海草重要性的认识。