Cyanobacteria and microcystins in lake Furnas (S. Miguel island-Azores)
This study investigated the changes in the cyanobacterial population and quantified the occurrence of microcystins in Lake Furnas during the first decade of the 21st century. The eutrophication of Lake Furnas has been recognized since the 1980s. The lake's phytoplankton population increased ove...
| Autores: | , , |
|---|---|
| Formato: | artículo |
| Fecha de publicación: | 2012 |
| País: | España |
| Recursos: | Universitat Autònoma de Barcelona |
| Repositorio: | Dipòsit Digital de Documents de la UAB |
| Idioma: | inglés |
| OAI Identifier: | oai:ddd.uab.cat:108760 |
| Acesso em linha: | https://ddd.uab.cat/record/108760 |
| Access Level: | acceso abierto |
| Palavra-chave: | Qualitat d'aigua Cianobactèries Floracions algals Microcistines Water quality Cyanobacteria Blooms Microcystins Calidad del agua Cianobacterias Floraciones algales Microcistinas |
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Cyanobacteria and microcystins in lake Furnas (S. Miguel island-Azores) Cianobacterias y microcistinas en la laguna Furnas (isla de S. Miguel-Azores) |
| title |
Cyanobacteria and microcystins in lake Furnas (S. Miguel island-Azores) |
| spellingShingle |
Cyanobacteria and microcystins in lake Furnas (S. Miguel island-Azores) Santos, Maria C. R. Qualitat d'aigua Cianobactèries Floracions algals Microcistines Water quality Cyanobacteria Blooms Microcystins Calidad del agua Cianobacterias Floraciones algales Microcistinas |
| title_short |
Cyanobacteria and microcystins in lake Furnas (S. Miguel island-Azores) |
| title_full |
Cyanobacteria and microcystins in lake Furnas (S. Miguel island-Azores) |
| title_fullStr |
Cyanobacteria and microcystins in lake Furnas (S. Miguel island-Azores) |
| title_full_unstemmed |
Cyanobacteria and microcystins in lake Furnas (S. Miguel island-Azores) |
| title_sort |
Cyanobacteria and microcystins in lake Furnas (S. Miguel island-Azores) |
| dc.creator.none.fl_str_mv |
Santos, Maria C. R. Muelle, Helena Pacheco, Dina M. D. |
| author |
Santos, Maria C. R. |
| author_facet |
Santos, Maria C. R. Muelle, Helena Pacheco, Dina M. D. |
| author_role |
author |
| author2 |
Muelle, Helena Pacheco, Dina M. D. |
| author2_role |
author author |
| dc.subject.none.fl_str_mv |
Qualitat d'aigua Cianobactèries Floracions algals Microcistines Water quality Cyanobacteria Blooms Microcystins Calidad del agua Cianobacterias Floraciones algales Microcistinas |
| topic |
Qualitat d'aigua Cianobactèries Floracions algals Microcistines Water quality Cyanobacteria Blooms Microcystins Calidad del agua Cianobacterias Floraciones algales Microcistinas |
| description |
This study investigated the changes in the cyanobacterial population and quantified the occurrence of microcystins in Lake Furnas during the first decade of the 21st century. The eutrophication of Lake Furnas has been recognized since the 1980s. The lake's phytoplankton population increased over the years in relation to this process of nutrient enrichment. Cyanobacteria began to dominate the phytoplankton and blooms of greater than 20 · 103 cells/ml occurred. After 2004, cyanobacterial blooms occurred regularly in the lake throughout the year. From 2000 through 2009, 30 blooms were detected. Of these blooms, 13 were dominated by Microcystis aeruginosa and 11 by Woronichinia naegeliana. In the other 6 blooms, the dominant cyanobacteria were Microcystis spp., Anabaena spp., Aphanocapsa spp. and Coelosphaerium kuetzingianum. A number of blooms involved more than 2 species simultaneously. The highest cell density (12.3 · 106 cells/ml) occurred during winter 2007. The predominant species in this bloom were M. aeruginosa (11.9 · 106 cells/ml) and W. naegeliana (83.8 · 103 cells/ml). Because almost all of the cyanobacteria cited were considered toxin producers, a search for microcystins, the hepatotoxins most often found in freshwaters, was initiated in 2001. Samples were collected at four depths: surface, 2.5 m, 5.0 m and 0.5 m above the sediments. From 2001 through 2009, soluble microcystins were detected six times during the summer, four times during the winter and autumn and three times during the spring (25 % of 129 samples). The average concentrations of soluble microcystins in the water column ranged from 0.1 µg/l to 0.5 µg/l. Intracellular microcystins were detected in 84 % of the samples. All samples collected after 2004 contained these cyanotoxins. The average concentrations of intracellular microcystins in the water column ranged from 0.1 µg/l to 11.2 µg/l. The highest value (154.5 µg/l) was found in a water sample collected from the lake surface during the winter of 2009, during a bloom dominated by W. naegeliana. The amounts of microcystins produced by cyanobacteria, expressed on a seston dry weight basis, varied between 24 mg/kg and 9737 mg/kg and showed an increase in 2008 and 2009. The concentrations of microcystins in samples from M. aeruginosa blooms ranged from 86 mg/kg to 1171 mg/kg and the highest values were recorded during the spring and summer of 2008. |
| publishDate |
2012 |
| dc.date.none.fl_str_mv |
2 2012-01-01 2012 2012-01-01 |
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Article http://purl.org/coar/resource_type/c_6501 VoR http://purl.org/coar/version/c_970fb48d4fbd8a85 |
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info:eu-repo/semantics/article |
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article |
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https://ddd.uab.cat/record/108760 |
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https://ddd.uab.cat/record/108760 |
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Inglés eng |
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Inglés |
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eng |
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open access http://purl.org/coar/access_right/c_abf2 https://rightsstatements.org/vocab/InC/1.0/ |
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info:eu-repo/semantics/openAccess |
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open access http://purl.org/coar/access_right/c_abf2 https://rightsstatements.org/vocab/InC/1.0/ |
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openAccess |
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application/pdf |
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reponame:Dipòsit Digital de Documents de la UAB instname:Universitat Autònoma de Barcelona |
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Universitat Autònoma de Barcelona |
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Cyanobacteria and microcystins in lake Furnas (S. Miguel island-Azores)Cianobacterias y microcistinas en la laguna Furnas (isla de S. Miguel-Azores)Santos, Maria C. R.Muelle, HelenaPacheco, Dina M. D.Qualitat d'aiguaCianobactèriesFloracions algalsMicrocistinesWater qualityCyanobacteriaBloomsMicrocystinsCalidad del aguaCianobacteriasFloraciones algalesMicrocistinasThis study investigated the changes in the cyanobacterial population and quantified the occurrence of microcystins in Lake Furnas during the first decade of the 21st century. The eutrophication of Lake Furnas has been recognized since the 1980s. The lake's phytoplankton population increased over the years in relation to this process of nutrient enrichment. Cyanobacteria began to dominate the phytoplankton and blooms of greater than 20 · 103 cells/ml occurred. After 2004, cyanobacterial blooms occurred regularly in the lake throughout the year. From 2000 through 2009, 30 blooms were detected. Of these blooms, 13 were dominated by Microcystis aeruginosa and 11 by Woronichinia naegeliana. In the other 6 blooms, the dominant cyanobacteria were Microcystis spp., Anabaena spp., Aphanocapsa spp. and Coelosphaerium kuetzingianum. A number of blooms involved more than 2 species simultaneously. The highest cell density (12.3 · 106 cells/ml) occurred during winter 2007. The predominant species in this bloom were M. aeruginosa (11.9 · 106 cells/ml) and W. naegeliana (83.8 · 103 cells/ml). Because almost all of the cyanobacteria cited were considered toxin producers, a search for microcystins, the hepatotoxins most often found in freshwaters, was initiated in 2001. Samples were collected at four depths: surface, 2.5 m, 5.0 m and 0.5 m above the sediments. From 2001 through 2009, soluble microcystins were detected six times during the summer, four times during the winter and autumn and three times during the spring (25 % of 129 samples). The average concentrations of soluble microcystins in the water column ranged from 0.1 µg/l to 0.5 µg/l. Intracellular microcystins were detected in 84 % of the samples. All samples collected after 2004 contained these cyanotoxins. The average concentrations of intracellular microcystins in the water column ranged from 0.1 µg/l to 11.2 µg/l. The highest value (154.5 µg/l) was found in a water sample collected from the lake surface during the winter of 2009, during a bloom dominated by W. naegeliana. The amounts of microcystins produced by cyanobacteria, expressed on a seston dry weight basis, varied between 24 mg/kg and 9737 mg/kg and showed an increase in 2008 and 2009. The concentrations of microcystins in samples from M. aeruginosa blooms ranged from 86 mg/kg to 1171 mg/kg and the highest values were recorded during the spring and summer of 2008.Este estudio presenta la variación de la población de cianobacterias y la cuantificación de microcistinas en la Laguna Furnas en la primera década del siglo 21. La eutrofización de la Laguna Furnas había sido señalada desde los años ochenta del siglo pasado. Debido a este proceso de enriquecimiento en nutrientes, la población de fitoplancton aumentó a lo largo de los años, las cianobacterias se volvieron dominantes y surgieron blooms (más de 20 · 103 células/ml). Después del 2004, los blooms de cianobacterias fueron permanentes en la laguna. De 2000 a 2009, se detectaron 30 blooms, 13 dominados por Microcystis aeruginosa y 11 por Woronichinia naegeliana. En los 6 restantes, las cianobacterias dominantes fueron Microcystis spp., Anabaena spp., Aphanocapsa spp. y Coelosphaerium kuetzingianum. A recesen algunas ocasiones, existieron más de dos especies en la fase de Bloom al mismo tiempo. La densidad celular más alta (12.3 · 106 células/ml) tuvo lugar en el invierno de 2007, siendo M. aeruginosa (11.9 · 106 células/ml) y la W. naegeliana (83.8 · 103 células/ml) las especies predominantes. A partir de 2001 y una vez que casi todas las cianobacterias mencionadas fueron consideradas como productoras de toxinas, se inició la búsqueda de microcistinas, concretamente las hepatotoxinas ya que son las más frecuentes en aguas dulces. Las muestras se tomaron en cuatro profundidades: superficie, 2.5 m, 5.0 m y 0.5 m por cima del sedimento. De 2001 a 2009, fueron detectadas microcistinas solubles seis veces en verano, cuatro veces en invierno y otoño y tres veces en primavera (25 %de 129 muestras). Sus concentraciones medias en la columna de agua variaron desde 0.1 µg/l hasta 0.5 µg/l. Fueron detectadas microcistinas intracelulares en el 84 % de las muestras y en todas las recogidas después del 2004. Sus concentraciones medias en la columna de agua variaron desde 0.1 µg/l hasta 11.2 µg/l. El valor más alto (154.5 µg/l) fue encontrado en una muestra recogida en la superficie durante el invierno de 2009, mientras ocurría un bloom dominado por W. naegeliana. Las cantidades de microcistinas producidas por las cianobacterias, expresadas en base de peso seco del seston, variaron entre 24 mg/kg y 9737 mg/kg y mostraron un aumento en los años 2008 y 2009. Las concentraciones en muestras de blooms de M. aeruginosa variaron desde 86 mg/kg hasta 1171 mg/kg y los valores más altos fueron registrados en primavera y verano de 2008. 22012-01-0120122012-01-01Articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://ddd.uab.cat/record/108760reponame:Dipòsit Digital de Documents de la UABinstname:Universitat Autònoma de BarcelonaInglésengopen accesshttp://purl.org/coar/access_right/c_abf2Aquest material està protegit per drets d'autor i/o drets afins. Podeu utilitzar aquest material en funció del que permet la legislació de drets d'autor i drets afins d'aplicació al vostre cas. Per a d'altres usos heu d'obtenir permís del(s) titular(s) de drets.https://rightsstatements.org/vocab/InC/1.0/info:eu-repo/semantics/openAccessoai:ddd.uab.cat:1087602026-06-06T12:50:31Z |
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15,300724 |