{"title":"Diversity of benthic fauna of rhodoliths and sediments deposited on sandstone reefs in Southeast Brazil","authors":"Sabrina Brahim Neves, K. G. Costa","doi":"10.1590/2675-2824070.21029sbn","DOIUrl":null,"url":null,"abstract":"diversity of organisms. In the north sector of the state of Espírito Santo, southeastern Brazil, the beaches are characterized by ferruginous sandstone reefs in the intertidal zones. These structures have unconsolidated sediment deposited over the reefs, mainly composed of bioclastic fragments of shells and seaweed, like the rhodolith. Rhodoliths are free-living calcareous algae with three-dimensional structures. By modifying the environment's physical characteristics, they create new microhabitats capable of being inhabited by several organisms, such as meio- and macrobenthonic invertebrates. This study sought to investigate the diversity of benthic fauna (macro- and meiofauna) on different substrates (rhodoliths vs. unconsolidated sediment) in the sandstone reef and investigate whether there are differences in benthic community structure between reef zones on Gramuté Beach in the Costa das Algas Environmental Protection Area in Aracruz, Espírito Santo, Brazil. Uni and multifactor analyses showed significant differences in the composition of the benthic fauna between the substrates (p < 0.05). Meiofauna and macrofauna had higher numbers of taxa and diversity associated with rhodoliths compared to with sediments. A multivariate analysis corroborates the results of the univariate, showing variations between substrates and beach zones. The presence of rhodoliths at Gramuté Beach contributes to the heterogeneity of the ecosystem and increases the richness and diversity of the benthos. The character of the benthic community and its dynamic aspects are discussed herein and are extremely important for conservation actions. Abstract","PeriodicalId":19418,"journal":{"name":"Ocean and Coastal Research","volume":"1 1","pages":""},"PeriodicalIF":1.0000,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Ocean and Coastal Research","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1590/2675-2824070.21029sbn","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MARINE & FRESHWATER BIOLOGY","Score":null,"Total":0}
引用次数: 2
Abstract
diversity of organisms. In the north sector of the state of Espírito Santo, southeastern Brazil, the beaches are characterized by ferruginous sandstone reefs in the intertidal zones. These structures have unconsolidated sediment deposited over the reefs, mainly composed of bioclastic fragments of shells and seaweed, like the rhodolith. Rhodoliths are free-living calcareous algae with three-dimensional structures. By modifying the environment's physical characteristics, they create new microhabitats capable of being inhabited by several organisms, such as meio- and macrobenthonic invertebrates. This study sought to investigate the diversity of benthic fauna (macro- and meiofauna) on different substrates (rhodoliths vs. unconsolidated sediment) in the sandstone reef and investigate whether there are differences in benthic community structure between reef zones on Gramuté Beach in the Costa das Algas Environmental Protection Area in Aracruz, Espírito Santo, Brazil. Uni and multifactor analyses showed significant differences in the composition of the benthic fauna between the substrates (p < 0.05). Meiofauna and macrofauna had higher numbers of taxa and diversity associated with rhodoliths compared to with sediments. A multivariate analysis corroborates the results of the univariate, showing variations between substrates and beach zones. The presence of rhodoliths at Gramuté Beach contributes to the heterogeneity of the ecosystem and increases the richness and diversity of the benthos. The character of the benthic community and its dynamic aspects are discussed herein and are extremely important for conservation actions. Abstract
生物多样性。在巴西东南部Espírito圣州的北部地区,海滩的特点是潮间带的铁质砂岩礁。这些结构在珊瑚礁上沉积了未固结的沉积物,主要由贝壳和海藻的生物碎屑碎片组成,如rhodolith。Rhodoliths是自由生活的钙质藻类,具有三维结构。通过改变环境的物理特征,他们创造了新的微栖息地,能够被几种生物居住,比如小型和大型底栖无脊椎动物。本研究旨在调查砂岩礁中不同基质(rhodolith vs. un固结沉积物)上底栖动物(大型和小型动物)的多样性,并调查巴西Espírito Santo Aracruz Costa das Algas环境保护区gramut海滩各珊瑚礁区底栖动物群落结构是否存在差异。单因素和多因素分析显示,不同基质间底栖动物组成差异显著(p < 0.05)。与沉积物相比,与rhodoliths相关的小型动物和大型动物的类群数量和多样性更高。多变量分析证实了单变量分析的结果,显示了基质和海滩带之间的差异。gramut海滩的rhodolith的存在有助于生态系统的异质性,并增加了底栖生物的丰富性和多样性。本文讨论了底栖生物群落的特征及其动态方面,并对保护行动极为重要。摘要