Centro Acadêmico de Vitória, Universidade Federal de Pernambuco, Rua Alto Do Reservatório, S/n, Bela Vista, Vitória de Santo Antão, Pernambuco, Brazil; Departamento de Invertebrados, Museu Nacional, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.
Centro Acadêmico de Vitória, Universidade Federal de Pernambuco, Rua Alto Do Reservatório, S/n, Bela Vista, Vitória de Santo Antão, Pernambuco, Brazil; Programa de Pós-Graduação Em Biologia Animal, Departamento de Zoologia, Centro de Biociências, Universidade Federal de Pernambuco, Av. Professor Moraes Rego, 1235, Recife, Pernambuco, Brazil.
Mar Environ Res. 2024 Jun;198:106563. doi: 10.1016/j.marenvres.2024.106563. Epub 2024 May 23.
The Amazon Reef System (ARS) is one of the most important shallow and mesophotic reef ecosystems in the South Atlantic Ocean. The ARS consists mainly of extensive beds of calcareous algae interspersed by assemblages of octocorals and sponges. The enormous freshwater discharge from the Amazon River forms a plume along the extensive Amazon continental shelf, for which the hydroid community is still largely unknown. The aim of this study is to document the diversity and distribution of hydroids from the ARS, as well as to infer the influence of the plume on species composition in the different zones. Samples were collected at ninety-six stations between 15 and 240 m deep on the Amazon shelf. A total of 37 species were recorded in the studied area. Hydroid assemblages are richer in zones under lower river plume influence, and species composition differs significantly between zones with and without plume influence (PERMANOVA, p = 0.0025). The dissolved oxygen and nitrate ranges were the environmental variables significantly correlated with the hydroid distribution. This study is the first surveying the hydroid species composition and richness in the ARS, highlighting the presence of a typical reef biota and that further faunal studies in underexplored areas of the Atlantic should reveal the distribution of many poorly known hydroids species.
亚马逊礁系统（ARS）是南大西洋最重要的浅海和中层礁生态系统之一。ARS 主要由广泛的钙质藻类床组成，其间散布着八放珊瑚和海绵的组合体。亚马逊河巨大的淡水排放量在广阔的亚马逊大陆架上形成了一股羽流，而水螅社区在很大程度上仍未被了解。本研究的目的是记录 ARS 中水螅的多样性和分布情况，并推断羽流对不同区域物种组成的影响。在亚马逊大陆架上 15 至 240 米深的 96 个站位采集了样本。在所研究的区域中记录了 37 种水螅。在受较低河羽流影响的区域，水螅组合更为丰富，而受羽流影响和不受羽流影响的区域之间的物种组成差异显著（PERMANOVA，p=0.0025）。溶解氧和硝酸盐范围是与水螅分布显著相关的环境变量。本研究首次对 ARS 中水螅物种组成和丰富度进行了调查，突出了典型的珊瑚礁生物群的存在，并且在大西洋未充分探索的区域进行进一步的动物群研究应该会揭示许多鲜为人知的水螅物种的分布情况。
