Spatio-temporal variation of cyanobacteria and cyanotoxins in public supply reservoirs of the semi-arid region of Brazil
Cyanobacteria and cyanotoxins in reservoirs of the semi-arid region
Accepted: 16 September 2019
HTML: 151
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.
Authors
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: (a) the largest biovolumes of potential toxin producing cyanobacteria occur when cyanotoxin concentrations are highest; and (b) 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 three-month 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 (Camalaú Reservoir). Cylindrospermopsin was only detected in a reservoir for the first time in the State of Paraíba. 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.
Edited by
Andrea Lami, CNR-IRSA Verbania, ItalyHow to Cite
Similar Articles
- Mariana C. Hennemann, Mauricio M. Petrucio, High chlorophyll a concentration in a low nutrient context: discussions in a subtropical lake dominated by Cyanobacteria , Journal of Limnology: Vol. 75 No. 3 (2016)
- Armine Hayrapetyan, Gor Gevorgyan , Martin Schultze, Muhammed Shikhani, Termine Khachikyan, Aleksandr Krylov, Karsten Rinke, Contemporary community composition, spatial distribution patterns, and biodiversity characteristics of zooplankton in large alpine Lake Sevan, Armenia , Journal of Limnology: Vol. 81 No. s1 (2022): Lake Sevan. Past, present, and future state of a unique alpine lake
- Tomasz Mieczan, Małgorzata Adamczuk, Monika Tarkowska-Kukuryk, Dorota Nawrot, Effect of water chemistry on zooplanktonic and microbial communities across freshwater ecotones in different macrophyte-dominated shallow lakes , Journal of Limnology: Vol. 75 No. 2 (2016)
- Alexey A. Kotov, Sompop Saeheng, Supiyanit Maiphae, Kay Van Damme, Study of the embryogenesis of Dunhevedia crassa King, 1853 (Cladocera: Chydoridae) and a comparison of embryonic instar durations in different cladocerans , Journal of Limnology: Vol. 72 No. 3 (2013)
- Stephan Hilgert, Friedrich Gauger, Sebastian Hölzlwimmerl, Stephan Fuchs, Development of a flexible dialysis pore water sampler placement system: easy handling and related error sources , Journal of Limnology: Vol. 74 No. 2 (2015)
- Pol Tarrats, Miguel Cañedo-Argüelles, Maria Rieradevall, Narcís Prat, Chironomid communities as indicators of local and global changes in an oligotrophic high mountain lake (Enol Lake, Northwestern Spain) , Journal of Limnology: Vol. 76 No. 2 (2017)
- María I. Ríos-Pulgarín, Mario Barletta, María C. Arango-Jaramillo, Néstor J. Mancera-Rodríguez, The role of the hydrological cycle on the temporal patterns of macroinvertebrate assemblages in an Andean foothill stream in Colombia , Journal of Limnology: Vol. 75 No. s1 (2016): Proceedings of the 6th National Congress of Limnology
- Wenzhi Wei, Riming Chen, Liufu Wang, Lixia Fu, Spatial distribution of crustacean zooplankton in a large river-connected lake related to trophic status and fish , Journal of Limnology: Vol. 76 No. 3 (2017)
- Tiina Nõges, Orlane Anneville, Jean Guillard, Juta Haberman, Ain Järvalt, Marina Manca, Giuseppe Morabito, Michela Rogora, Stephen J. Thackeray, Pietro Volta, Ian J. Winfield, Peeter Nõges, Fisheries impacts on lake ecosystem structure in the context of a changing climate and trophic state , Journal of Limnology: Vol. 77 No. 1 (2018)
- Gayane Shahnazaryan, Martin Schultze, Karsten Rinke, Bardukh Gabrielyan, Lake Sevan. Past, present, and future state of a unique alpine lake , Journal of Limnology: Vol. 81 No. s1 (2022): Lake Sevan. Past, present, and future state of a unique alpine lake
<< < 5 6 7 8 9 10 11 12 13 14 > >>
You may also start an advanced similarity search for this article.
-
Juliana dos Santos Severiano, Edlayne Rayanara Pontes de Lima, Daniely de Lucena-Silva, Dayrla Kelly Gomes Rocha, Maria Eduarda Santana Veríssimo, Bruno Renaly Souza Figueiredo, José Etham de Lucena Barbosa, Joseline MolozziWater Research : 2023
-
Thiago Santos de Almeida Lopes, Amanda Myrna de Meneses e Costa, Whelton Brito dos Santos, Weruska Brasileiro Ferreira, Patricia Herminio CunhaCadernos Técnicos Engenharia Sanitária e Ambiental : 2023
-
Ranielle Daiana dos Santos-Silva, Juliana dos Santos Severiano, Mathias Ahii Chia, Tatiane Medeiros Queiroz, Micheline Kézia Cordeiro-Araújo, José Etham de Lucena BarbosaEnvironmental Pollution : 2024
-
Flávia Morgana Monteiro, Gustavo Correia de Moura, Juliana dos Santos Severiano, Camila Ferreira Mendes, José Etham de Lucena BarbosaAquatic Ecology : 2021
-
Andreia Souza Regis, Ronaldo Faustino da Silva , Fabio Henrique Portella Corrêa de Oliveira, Eduardo José Alécio de OliveiraRevista de Gestão Social e Ambiental : 2024