干旱区生态环境知识资源中心(Arid): Spatio-temporal variation of cyanobacteria and cyanotoxins in public supply reservoirs of the semi-arid region of Brazil

Arid

DOI	10.4081/jlimnol.2019.1893
	Spatio-temporal variation of cyanobacteria and cyanotoxins in public supply reservoirs of the semi-arid region of Brazil
	dos Santos Silva, Ranielle Daiana 1; Severiano, Juliana dos Santos 1; de Oliveira, Dayany Aguiar 1; Mendes, Camila Ferreira 1; Barbosa, Vanessa Virginia 1; Chia, Mathias Ahii 2; de Lucena Barbosa, Jose Etham 1
通讯作者	Severiano, Juliana dos Santos
来源期刊	JOURNAL OF LIMNOLOGY
ISSN	1129-5767
EISSN	1723-8633
出版年	2020
卷号	79 期号:1 页码:13-29
英文摘要	Cyanobacteria harmful algal blooms (CyanoHABs) have become increasingly frequent and intense in public supply reservoirs as a result of eutrophication and global climate change. The semi-arid region of Brazil has a well documented history of CyanoHABs but the underlying factors that control the excessive proliferation of these organisms and the production of their bioactive secondary metabolites are not comprehensively understood. This study aimed to identify the environmental factors that explain the spatial and temporal variations in the abundance of cyanobacteria and the concentration of cyanotoxins (microcystins, saxitoxins, and cylindrospermopsin) in semi-arid reservoirs. The following hypotheses were tested: i) the largest biovolumes of potential toxin producing cyanobacteria occur when cyanotoxin concentrations are highest; and ii) the environmental factors that explain variations in biovolume of cyanobacteria also explain changes in cyanotoxins concentrations. Samples were taken from four reservoirs located in the Northeast region of Brazil, over a threemonth period (October 2016 and February and June 2017). Of the 24 species of cyanobacteria identified, 13 were potentially toxin-producing. Physicochemical variables such as water volume of the reservoir, water transparency, soluble reactive phosphorus, and total phosphorus explained the abundance of cyanobacteria and the levels of cyanotoxins. These results corroborate the hypothesis that similar physicochemical conditions influence the abundance and diversity of cyanobacteria and cyanotoxins. Cyanobacterial blooms composed of more than one potential toxin producing species were observed in the studied reservoirs, where potential microcystin-producing species were the most common. Microcystins and saxitoxins were detected in all the reservoirs studied, while cylindrospermopsin and the cyanobacterium Cylindrospermopsis raciborskii were simultaneously recorded in only one reservoir (Camalau Reservoir). Cylindrospermopsin was only detected in a reservoir for the first time in the State of Paraiba. Canonical redundancy analysis showed that the cyanotoxins were related to potential toxin producing species. These results corroborate the proposed hypothesis that there is a correlation between cyanotoxins and the biomass of potential producers. Also, there were situations where cyanotoxins were detected without the presence of potential producers. These results demonstrate the need for reassessment of potential toxin producing species of cyanobacteria in semi-arid reservoirs. This may lead to the identification and characterization of novel producers of these bioactive secondary metabolites.
英文关键词	Eutrophication cylindrospermopsins microcystins saxitoxins tropical reservoirs
类型	Article
语种	英语
国家	Brazil ; Nigeria
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000548063600002
WOS关键词	WATER-RESOURCES MANAGEMENT ; CLIMATE-CHANGE ; MICROCYSTIN-LR ; CYLINDROSPERMOPSIS-RACIBORSKII ; ENVIRONMENTAL-FACTORS ; GLOBAL EXPANSION ; BLOOMS ; LAKE ; TOXICITY ; RISK
WOS类目	Limnology
WOS研究方向	Marine & Freshwater Biology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/319665
作者单位	1.Univ Estadual Paraiba, Lab Ecol Aquat, Ctr Ciencias Biol, Programa Posgrad Ecol & Conservacao,Dept Biol, Rua Baraimas 351, BR-58429500 Campina Grande, Paraiba, Brazil; 2.Ahmadu Bello Univ, Dept Bot, Zaria, Nigeria
推荐引用方式 GB/T 7714	dos Santos Silva, Ranielle Daiana,Severiano, Juliana dos Santos,de Oliveira, Dayany Aguiar,et al. Spatio-temporal variation of cyanobacteria and cyanotoxins in public supply reservoirs of the semi-arid region of Brazil[J],2020,79(1):13-29.
APA	dos Santos Silva, Ranielle Daiana.,Severiano, Juliana dos Santos.,de Oliveira, Dayany Aguiar.,Mendes, Camila Ferreira.,Barbosa, Vanessa Virginia.,...&de Lucena Barbosa, Jose Etham.(2020).Spatio-temporal variation of cyanobacteria and cyanotoxins in public supply reservoirs of the semi-arid region of Brazil.JOURNAL OF LIMNOLOGY,79(1),13-29.
MLA	dos Santos Silva, Ranielle Daiana,et al."Spatio-temporal variation of cyanobacteria and cyanotoxins in public supply reservoirs of the semi-arid region of Brazil".JOURNAL OF LIMNOLOGY 79.1(2020):13-29.