Rafael Henrique DE Moura-Falcão, Maria DA Glória G DA Silva-Cunha, Gislayne Cristina P Borges, Leandro C Ferreira, Gabriel B Farias, Ana Cecília R DE Albergaria-Barbosa, Pedro A Reis, Moacyr C DE Araujo Filho, Pedro Augusto M C Melo
{"title":"环境变异对巴西-马尔维纳斯群岛交汇处(BMC)浮游植物结构、多样性和生物量的影响。","authors":"Rafael Henrique DE Moura-Falcão, Maria DA Glória G DA Silva-Cunha, Gislayne Cristina P Borges, Leandro C Ferreira, Gabriel B Farias, Ana Cecília R DE Albergaria-Barbosa, Pedro A Reis, Moacyr C DE Araujo Filho, Pedro Augusto M C Melo","doi":"10.1590/0001-3765202420230744","DOIUrl":null,"url":null,"abstract":"<p><p>The Brazil-Malvinas Confluence (BMC) is a significant biological frontier where distinct currents meet, fostering optimal conditions for phytoplankton development. In this study we tested the hypothesis that eddys promote an increase in phytoplankton biomass at the Brazil-Malvinas Confluence (BMC), altering species diversity. Phytoplankton were collected with Niskin bottles and nutrient concentrations assessed at two depths (Surface and Deep Chlorophyll Maximum Layer - DCML) in areas outside and under the influence of Cold-Core (CCE) and Warm-Core (WCE) Eddies. Environmental variables were determined in situ using a CTD profiler. Four regions were separated based on environmental variables and phytoplankton species, namely, the Brazil Current (BC), Malvinas Current (MC), CCE, and WCE. Species diversity was higher in the eddies. The conditions of the WCE were different from those of the CCE, with low temperature and salinity and high cell density values in the latter. The phylum Bacillariophyta was predominant in terms of species richness in all regions and was responsible for the higher cell density in the MC, while dinoflagellates were dominant in the BC and eddies. 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引用次数: 0
摘要
巴西-马尔维纳斯群岛交汇处(BMC)是一个重要的生物前沿地带,不同的洋流在此交汇,为浮游植物的生长提供了最佳条件。在这项研究中,我们对以下假设进行了检验:漩涡会促进巴西-马尔维纳斯群岛交汇处(BMC)浮游植物生物量的增加,从而改变物种多样性。在冷核涡旋(CCE)和暖核涡旋(WCE)影响范围外和影响范围内的两个深度(表层和深叶绿素最高层--DCML),我们用尼斯金瓶收集浮游植物并评估营养浓度。使用 CTD 剖面仪对环境变量进行了实地测定。根据环境变量和浮游植物种类划分了四个区域,即巴西洋流(BC)、马尔维纳斯群岛洋流(MC)、CCE 和 WCE。漩涡中的物种多样性较高。WCE 的条件与 CCE 不同,后者的温度和盐度较低,细胞密度值较高。从物种丰富度的角度看,所有区域都以芽孢杆菌门为主,这也是 MC 区细胞密度较高的原因,而 BC 区和漩涡区则以甲藻为主。因此,漩涡活动改变了 BMC 浮游植物群落的结构、多样性和生物量。
Effects of environmental variability on phytoplankton structure, diversity and biomass at the Brazil-Malvinas Confluence (BMC).
The Brazil-Malvinas Confluence (BMC) is a significant biological frontier where distinct currents meet, fostering optimal conditions for phytoplankton development. In this study we tested the hypothesis that eddys promote an increase in phytoplankton biomass at the Brazil-Malvinas Confluence (BMC), altering species diversity. Phytoplankton were collected with Niskin bottles and nutrient concentrations assessed at two depths (Surface and Deep Chlorophyll Maximum Layer - DCML) in areas outside and under the influence of Cold-Core (CCE) and Warm-Core (WCE) Eddies. Environmental variables were determined in situ using a CTD profiler. Four regions were separated based on environmental variables and phytoplankton species, namely, the Brazil Current (BC), Malvinas Current (MC), CCE, and WCE. Species diversity was higher in the eddies. The conditions of the WCE were different from those of the CCE, with low temperature and salinity and high cell density values in the latter. The phylum Bacillariophyta was predominant in terms of species richness in all regions and was responsible for the higher cell density in the MC, while dinoflagellates were dominant in the BC and eddies. Therefore, eddy activity alters the structure, diversity and biomass of the phytoplankton community in the BMC.
期刊介绍:
The Brazilian Academy of Sciences (BAS) publishes its journal, Annals of the Brazilian Academy of Sciences (AABC, in its Brazilianportuguese acronym ), every 3 months, being the oldest journal in Brazil with conkinuous distribukion, daking back to 1929. This scienkihic journal aims to publish the advances in scienkihic research from both Brazilian and foreigner scienkists, who work in the main research centers in the whole world, always looking for excellence.
Essenkially a mulkidisciplinary journal, the AABC cover, with both reviews and original researches, the diverse areas represented in the Academy, such as Biology, Physics, Biomedical Sciences, Chemistry, Agrarian Sciences, Engineering, Mathemakics, Social, Health and Earth Sciences.