Pub Date : 2022-01-01DOI: 10.1590/2675-2824070.22071fmn
F. Nakamura, R. A. Lourenço, C. A. Magalhães, A. Bendia, A. Butarelli, Julia Gasparini Passos, Luiza Ferreira Soares, R. B. Ramos, T. Trevizani, C. N. Signori, M. Mahiques, P. Sumida, V. Pellizari
{"title":"Methane-related community of a carbonate-enriched pockmark, Brazilian Southeastern continental slope","authors":"F. Nakamura, R. A. Lourenço, C. A. Magalhães, A. Bendia, A. Butarelli, Julia Gasparini Passos, Luiza Ferreira Soares, R. B. Ramos, T. Trevizani, C. N. Signori, M. Mahiques, P. Sumida, V. Pellizari","doi":"10.1590/2675-2824070.22071fmn","DOIUrl":"https://doi.org/10.1590/2675-2824070.22071fmn","url":null,"abstract":"","PeriodicalId":19418,"journal":{"name":"Ocean and Coastal Research","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67144121","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.1590/2675-2824070.23001cac
C. Collins, R. Castro, Ilson C. A. da Silveira
{"title":"Introduction to advances in physical oceanography: a tribute to Prof. Affonso da Silveira Mascarenhas, Jr. (1938-2017)","authors":"C. Collins, R. Castro, Ilson C. A. da Silveira","doi":"10.1590/2675-2824070.23001cac","DOIUrl":"https://doi.org/10.1590/2675-2824070.23001cac","url":null,"abstract":"","PeriodicalId":19418,"journal":{"name":"Ocean and Coastal Research","volume":"81 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67143853","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.1590/2675-2824070.21093pcp
P. Pardo, S. F. Bastero, Laura Moreno, C. G. Castro
This study presents the implementation of a portable module designed for autonomous analysis of sea-surface inorganic nutrients onboard vessels of opportunity, as an additional tool for assessing the levels of eutrophication risk. The study was carried out during August-mid-September 2019 in the Ria de Arousa and outer shelf area (NW-Iberian coastal upwelling system). During this period, the distributions of the measured sea-surface concentrations of nitrate and phosphate were compared according to three Oceanographic Environments (OEs). The OEs were defined according to the interplay between upwelling/downwelling events and river discharge on the coastal system. The nutrient measurements agreed well with the OEs, showing that the portable module is a useful tool for opportune measurements of sea-surface nutrients and can serve as a complement for the available monitoring networks. An initial evaluation of the eutrophication risk in this area indicated low risk levels (following the Environmental European Agency criteria) for most of the measured points in summer, except for some vulnerable areas under certain OEs. Nutrient concentrations are sensitive to periods of Sustained Upwelling events, reaching medium risk levels (7.14 – 9.05 µmol L -1 for nitrate and 0.39 – 0.64 µmol L -1 for phosphate) in inner parts of the Ria de Arousa. These areas are characterized by abrupt bathymetric changes that channel and intensify the upwelling processes, increasing sea-surface nutrient concentrations. High eutrophication risk levels of phosphate (1.53 µmol L -1 ) were detected close to the coastline during Upwelling Relaxation periods. Under these conditions, continental flows, previously retained by the upwelling, are able to expand. The location of these samples and the difference in concentration between phosphate and nitrate indicate a most likely source in wastewater outflows. Our results highlight the need for deeper studies on the synergy between upwelling/downwelling processes and the continental water discharges and its modulation of sea-surface nutrients. Abstract
本研究介绍了一种便携式模块的实施，该模块设计用于自主分析机遇船上的海面无机营养物质，作为评估富营养化风险水平的附加工具。该研究于2019年8月至9月中旬在Ria de a和外大陆架区域(西北伊比利亚沿海上升流系统)进行。在此期间，根据三种海洋环境(OEs)比较了测量的海面硝酸盐和磷酸盐浓度的分布。根据上升流/下升流事件与海岸系统河流流量的相互作用来定义OEs。营养物的测量结果与OEs的结果一致，表明便携式模块是测量海面营养物的有用工具，可以作为现有监测网络的补充。对该地区富营养化风险的初步评估表明，除某些OEs下的一些脆弱地区外，夏季大多数测量点的富营养化风险水平较低(符合欧洲环境署的标准)。营养物质浓度对持续上升流事件的周期很敏感，在Ria de aroua内部达到中等风险水平(硝酸盐7.14 - 9.05µmol L -1，磷酸盐0.39 - 0.64µmol L -1)。这些地区的特点是水深变化突然，引导和加强了上升流过程，增加了海面营养物质浓度。在上升流松弛期，在海岸线附近检测到高富营养化风险水平(1.53µmol L -1)。在这些条件下，先前被上升流保留的大陆流能够扩张。这些样品的位置以及磷酸盐和硝酸盐浓度的差异表明废水流出中最有可能的来源。我们的研究结果表明，需要深入研究上升流/下升流过程与大陆水排放及其对海面营养物质的调节之间的协同作用。摘要
{"title":"Implementation of a portable module for assessing the eutrophication risk: initial evaluation in the upwelling-driven bay of Ria de Arousa (NW-Iberian Peninsula)","authors":"P. Pardo, S. F. Bastero, Laura Moreno, C. G. Castro","doi":"10.1590/2675-2824070.21093pcp","DOIUrl":"https://doi.org/10.1590/2675-2824070.21093pcp","url":null,"abstract":"This study presents the implementation of a portable module designed for autonomous analysis of sea-surface inorganic nutrients onboard vessels of opportunity, as an additional tool for assessing the levels of eutrophication risk. The study was carried out during August-mid-September 2019 in the Ria de Arousa and outer shelf area (NW-Iberian coastal upwelling system). During this period, the distributions of the measured sea-surface concentrations of nitrate and phosphate were compared according to three Oceanographic Environments (OEs). The OEs were defined according to the interplay between upwelling/downwelling events and river discharge on the coastal system. The nutrient measurements agreed well with the OEs, showing that the portable module is a useful tool for opportune measurements of sea-surface nutrients and can serve as a complement for the available monitoring networks. An initial evaluation of the eutrophication risk in this area indicated low risk levels (following the Environmental European Agency criteria) for most of the measured points in summer, except for some vulnerable areas under certain OEs. Nutrient concentrations are sensitive to periods of Sustained Upwelling events, reaching medium risk levels (7.14 – 9.05 µmol L -1 for nitrate and 0.39 – 0.64 µmol L -1 for phosphate) in inner parts of the Ria de Arousa. These areas are characterized by abrupt bathymetric changes that channel and intensify the upwelling processes, increasing sea-surface nutrient concentrations. High eutrophication risk levels of phosphate (1.53 µmol L -1 ) were detected close to the coastline during Upwelling Relaxation periods. Under these conditions, continental flows, previously retained by the upwelling, are able to expand. The location of these samples and the difference in concentration between phosphate and nitrate indicate a most likely source in wastewater outflows. Our results highlight the need for deeper studies on the synergy between upwelling/downwelling processes and the continental water discharges and its modulation of sea-surface nutrients. Abstract","PeriodicalId":19418,"journal":{"name":"Ocean and Coastal Research","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67342726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.1590/2675-2824070.21108tht
T. Trevizani, R. Nagai, R. Figueira, P. Sumida, M. Mahiques
{"title":"Chemical characterization of deep-sea corals from the continental slope of Santos Basin (southeastern Brazilian upper margin)","authors":"T. Trevizani, R. Nagai, R. Figueira, P. Sumida, M. Mahiques","doi":"10.1590/2675-2824070.21108tht","DOIUrl":"https://doi.org/10.1590/2675-2824070.21108tht","url":null,"abstract":"","PeriodicalId":19418,"journal":{"name":"Ocean and Coastal Research","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67143625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.1590/2675-2824070.22035pm
Pablo Mendonça, João Pedro de Mello Domingues, A. B. Bauer, L. G. Fischer, M. R. Costa
{"title":"Relative growth and morphometry of sagittae otoliths of weakfishes, Cynoscion guatucupa (Cuvier, 1830) and Cynoscion jamaicensis (Vaillant & Bocourt, 1883), in the Southwestern Atlantic Ocean, Brazil","authors":"Pablo Mendonça, João Pedro de Mello Domingues, A. B. Bauer, L. G. Fischer, M. R. Costa","doi":"10.1590/2675-2824070.22035pm","DOIUrl":"https://doi.org/10.1590/2675-2824070.22035pm","url":null,"abstract":"","PeriodicalId":19418,"journal":{"name":"Ocean and Coastal Research","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67143944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.1590/2675-2824070.21029sbn
Sabrina Brahim Neves, K. G. Costa
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
{"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":"https://doi.org/10.1590/2675-2824070.21029sbn","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":0.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67342235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.1590/2675-2824070.21077vt
V. Thirumurugan, Anoop Raj Singh, Nehru Prabakaran
{"title":"First report on the occurrence of Avicennia marina (Forssk.) Vierh. (Acanthaceae) in the Nicobar archipelago","authors":"V. Thirumurugan, Anoop Raj Singh, Nehru Prabakaran","doi":"10.1590/2675-2824070.21077vt","DOIUrl":"https://doi.org/10.1590/2675-2824070.21077vt","url":null,"abstract":"","PeriodicalId":19418,"journal":{"name":"Ocean and Coastal Research","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67342631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-09DOI: 10.1590/2675-2824069.20-011psp
P. Polito, O. Sato, D. Napolitano, I. T. Simoes-Sousa, Hélio Almeida, Fabrício R. Lapolli
Abstract At age 101, Walter Munk passed away in 2019. His groundbreaking discoveries will still guide and amaze oceanography students for years to come. Here, we perceive patterns in rotating tank with Munk's circulation theory aided by a Lagrangian particles tracking algorithm and numerical modeling. From information captured by video, we track the trajectories of drifters, and then objectively mapped the streamfunction to obtain the mean circulation pattern. We were able to reproduce the wind-forced anticyclonic and asymmetric gyre, including the western boundary intensification and its retroflection. The latter phenomenon was predicted by the non-linear version of Munk's model and observed in real subtropical gyres as small recirculation regions. We have configured two numerical model simulations mimicking the physical experiment, with linear and non-linear terms. The comparison between the numerical and physical experiments confirmed the effect of non-linear distortion of the gyre. Geophysical fluid dynamics is often hard to visualize, and counter-intuitive in a rotating system. We present this set of experiments as a tool for oceanography teaching. Besides studying general ocean circulation theories and observations through practical examples, this experiment provides an opportunity to develop basic image processing and geophysical modelling skills.
{"title":"Insights on the non-linear solution of Munk's ocean circulation theory from a rotating tank experiment","authors":"P. Polito, O. Sato, D. Napolitano, I. T. Simoes-Sousa, Hélio Almeida, Fabrício R. Lapolli","doi":"10.1590/2675-2824069.20-011psp","DOIUrl":"https://doi.org/10.1590/2675-2824069.20-011psp","url":null,"abstract":"Abstract At age 101, Walter Munk passed away in 2019. His groundbreaking discoveries will still guide and amaze oceanography students for years to come. Here, we perceive patterns in rotating tank with Munk's circulation theory aided by a Lagrangian particles tracking algorithm and numerical modeling. From information captured by video, we track the trajectories of drifters, and then objectively mapped the streamfunction to obtain the mean circulation pattern. We were able to reproduce the wind-forced anticyclonic and asymmetric gyre, including the western boundary intensification and its retroflection. The latter phenomenon was predicted by the non-linear version of Munk's model and observed in real subtropical gyres as small recirculation regions. We have configured two numerical model simulations mimicking the physical experiment, with linear and non-linear terms. The comparison between the numerical and physical experiments confirmed the effect of non-linear distortion of the gyre. Geophysical fluid dynamics is often hard to visualize, and counter-intuitive in a rotating system. We present this set of experiments as a tool for oceanography teaching. Besides studying general ocean circulation theories and observations through practical examples, this experiment provides an opportunity to develop basic image processing and geophysical modelling skills.","PeriodicalId":19418,"journal":{"name":"Ocean and Coastal Research","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45052881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-02DOI: 10.1590/2675-2824069.21-005wr
Wilson Rodríguez, C. Duque, S. Zea, L. Castellanos, Freddy A. Ramos, Abel M. Forero, O. Osorno
Abstract Five demosponges belonging to the order Axinellida: Axinella corrugata, Dragmacidon alvarezae, Dragmacidon reticulatum, Ptilocaulis walpersi, Myrmekioderma rea and one sponge belonging to the order Scopalinida: Scopalina ruetzleri were analyzed to assess their fatty acid composition in the phospholipid fraction. Additionally, the seasonal and intraspecific variation in fatty acids composition was assessed in M. rea and D. alvarezae. Fatty acid identification was conducted using an HRGC-MS with an ECL value of methyl ester derivatives, and analyzing their mass spectra. To confirm double bound location, N-acylpyrrolidide derivatives were used studying their mass spectra. In total, 83 fatty acids were identified with chain lengths ranging from C14 to C32. Interestingly, brominated fatty acids were identified, previously suggested for sponges. Polybranched fatty acids such as 4,8,12-trimethyltridecanoic acid (4,8,12-TMTD) and 3,7,11,15-tetramethylhexadecanoic (phytanic acid) were found, without a clear distribution pattern. A predominance of iso-acids (i-15:0 and i-17:0) on anteiso acids were observed. Some seasonal variations in fatty acid (FA) compositions for M. rea and D. alvarezae were observed. The hierarchical Clusters Analysis (HCA) showed that the FA composition was species-specific but not informative at the family or order level.
{"title":"Phospholipid fatty acids from Colombian Caribbean sea sponges","authors":"Wilson Rodríguez, C. Duque, S. Zea, L. Castellanos, Freddy A. Ramos, Abel M. Forero, O. Osorno","doi":"10.1590/2675-2824069.21-005wr","DOIUrl":"https://doi.org/10.1590/2675-2824069.21-005wr","url":null,"abstract":"Abstract Five demosponges belonging to the order Axinellida: Axinella corrugata, Dragmacidon alvarezae, Dragmacidon reticulatum, Ptilocaulis walpersi, Myrmekioderma rea and one sponge belonging to the order Scopalinida: Scopalina ruetzleri were analyzed to assess their fatty acid composition in the phospholipid fraction. Additionally, the seasonal and intraspecific variation in fatty acids composition was assessed in M. rea and D. alvarezae. Fatty acid identification was conducted using an HRGC-MS with an ECL value of methyl ester derivatives, and analyzing their mass spectra. To confirm double bound location, N-acylpyrrolidide derivatives were used studying their mass spectra. In total, 83 fatty acids were identified with chain lengths ranging from C14 to C32. Interestingly, brominated fatty acids were identified, previously suggested for sponges. Polybranched fatty acids such as 4,8,12-trimethyltridecanoic acid (4,8,12-TMTD) and 3,7,11,15-tetramethylhexadecanoic (phytanic acid) were found, without a clear distribution pattern. A predominance of iso-acids (i-15:0 and i-17:0) on anteiso acids were observed. Some seasonal variations in fatty acid (FA) compositions for M. rea and D. alvarezae were observed. The hierarchical Clusters Analysis (HCA) showed that the FA composition was species-specific but not informative at the family or order level.","PeriodicalId":19418,"journal":{"name":"Ocean and Coastal Research","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43404589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-06-15DOI: 10.1590/2675-2824069.20-004hmdja
H. M. Affe, Lorena Pedreira Conceição, D. S. Rocha, L. Proença, J. M. Nunes
The objective of this study was to evaluate variations in the composition and abundance of the phytoplankton community after an exceptional harmful bloom of Akashiwo sanguinea that occurred in Todos os Santos Bay (BTS) in early March, 2007. Samples were collected every ten days, between April, 2007 and March, 2008, from the estuarine gradient of the Paraguacu River to BTS. The physical and chemical variables were measured in situ using a multiparameter sensor. Water samples were collected for analysis of the dissolved inorganic nutrient concentrations and for the study of composition and abundance of the microphytoplankton. Overall, 135 taxa were identified, with a higher richness of diatoms. The total cell density ranged from 2.92 × 103 to 1.16 × 107 (5.47 × 105 ± 1.69 × 106) cells L−1, with higher values in the freshwater zone than in the marine area. Five species showed peaks of abundance throughout the study, forming small blooms. Four of these blooms occurred in the rainy season, formed by the species Guinardia striata (April, 2007), Scrippsiella cf. acuminata (August, 2007), Euglena gracilis (August, 2007), and Skeletonema cf. costatum (September, 2007), while a new bloom of the species Akashiwo sanguinea occurred during the dry season (December, 2007). The environment was typically oligotrophic, with low spatiotemporal variation in the concentrations of dissolved nutrients. Even so, we observed short-term variations in the structure and composition of the phytoplankton community, demonstrated by rapid bloom events, followed by an increase in the total abundance of microphytoplankton, especially during the rainy season. The blooms did not cause any notable changes in the water column and did not present any harmful effects on the system.
本研究的目的是评估2007年3月初在Todos os Santos湾（BTS）发生的Akashiwo血藻异常有害水华后浮游植物群落组成和丰度的变化。从2007年4月到2008年3月，每十天从巴拉圭河河口梯度到BTS采集一次样本。物理和化学变量使用多参数传感器进行现场测量。采集水样用于分析溶解的无机营养物浓度，并用于研究微小浮游生物的组成和丰度。总共鉴定了135个分类群，硅藻的丰富度较高。总细胞密度范围为2.92×103至1.16×107（5.47×105±1.69×106）个细胞L−1，淡水区的值高于海洋区。在整个研究过程中，有五个物种表现出丰富的峰值，形成了小花。其中四次开花发生在雨季，由条纹Guinardia striata（2007年4月）、尖尖斯克里普菌（2007年8月）、细眼虫（2007年八月）和中肋骨Skeletonema cf.costatum（2007年9月）形成，而赤血赤藻的一次新开花发生在旱季（2007年12月）。环境通常是贫营养的，溶解营养物质浓度的时空变化很低。即便如此，我们观察到浮游植物群落结构和组成的短期变化，表现为快速水华事件，随后微小浮游植物的总丰度增加，尤其是在雨季。水华没有引起水柱的任何显著变化，也没有对系统产生任何有害影响。
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