Hydrochemistry and trophic state change in a large reservoir in the Brazilian northeast region under intense drought conditions
The study shows changes on physical and chemical water parameters and of trophic state in a large reservoir in the Brazilian semiarid region following decreasing reservoir volume due to rainfall shortage during four consecutive years. The monitoring period, between November 2011 and May 2014, assess...
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| Natura: | article |
| Lingua: | inglese |
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2017
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| Accesso online: | https://hdl.handle.net/20.500.12008/22063 |
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| _version_ | 1868890178955771904 |
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| author | Santos, J. A. |
| author2 | Marins, R. V. Aguiar, J. E. Chalar Marquisá, Guillermo Silva, F. A. T. F. Lacerda, L. D. |
| author2_role | author author author author author |
| author_browse | Aguiar, J. E. Chalar Marquisá, Guillermo Lacerda, L. D. Marins, R. V. Santos, J. A. Silva, F. A. T. F. |
| author_facet | Santos, J. A. Marins, R. V. Aguiar, J. E. Chalar Marquisá, Guillermo Silva, F. A. T. F. Lacerda, L. D. |
| author_role | author |
| collection | COLIBRI |
| dc.contributor.none.fl_str_mv | Chalar Marquisá, Guillermo. Universidad de la República (Uruguay). Facultad de Ciencias. Instituto de Biología |
| dc.creator.none.fl_str_mv | Santos, J. A. Marins, R. V. Aguiar, J. E. Chalar Marquisá, Guillermo Silva, F. A. T. F. Lacerda, L. D. |
| dc.date.none.fl_str_mv | 2017 2019-10-02T22:12:08Z 2019-10-02T22:12:08Z 20190930 |
| dc.format.none.fl_str_mv | application/pdf |
| dc.identifier.none.fl_str_mv | Santos, J.A., et al. Hydrochemistry and trophic state change in a large reservoir in the Brazilian northeast region under intense drought conditions. Journal of Limnology, 2017, 76 (1): 41-51. doi: 10.4081/jlimnol.2016.1433 11295767 https://hdl.handle.net/20.500.12008/22063 10.4081/jlimnol.2016.1433 |
| dc.language.none.fl_str_mv | en eng |
| dc.publisher.none.fl_str_mv | Page Press Publications |
| dc.relation.none.fl_str_mv | Journal of Limnology, 2017, 76 (1): 41-51 |
| dc.rights.none.fl_str_mv | info:eu-repo/semantics/openAccess Licencia Creative Commons Atribución – No Comercial (CC -BY-NC 4.0) |
| dc.source.none.fl_str_mv | reponame:COLIBRI instname:Universidad de la República instacron:Universidad de la República |
| dc.subject.none.fl_str_mv | Eutrophication Reservoir Semiarid Trophic state index |
| dc.title.none.fl_str_mv | Hydrochemistry and trophic state change in a large reservoir in the Brazilian northeast region under intense drought conditions |
| dc.type.none.fl_str_mv | Artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
| description | The study shows changes on physical and chemical water parameters and of trophic state in a large reservoir in the Brazilian semiarid region following decreasing reservoir volume due to rainfall shortage during four consecutive years. The monitoring period, between November 2011 and May 2014, assessed approximately 50% water volume reduction and 10 meters’ decrease of reservoir water level that degraded water quality. Decrease in reservoir volume, strong evaporation and the permanent influence of anthropogenic activities, favored the concentration of salts and accumulation of nutrients and of increasing pH. Thermal stratification of the water column occurred when volume was maximum and lead to a significant reduction in dissolved oxygen in the hypolimnion (0.07 to 2.62 mg L–1). Diminishing volume resulted in mixing of the hypolimnion nutrient-rich and oxygen-poor waters in the entre water column and changed the initial oligotrophic condition to eutrophic. However, the temporal scale of the response of the reservoir’s trophic state differs in the different areas of the reservoir. Whereas deeper areas accumulating nutrients from aquaculture and agriculture progressively became mesotrophic and eventually eutrophic; shallower regions far from direct anthropogenic influences, changed their trophic sate much later, but rapidly turned into super-eutrophic conditions, probably due to more intense sediment resuspension and water mixing. Trophic State Index followed nutrient increase during most of the period. However, it also responded to an increase in chlorophyll a concentrations when the reservoir achieved its minimum volume, in particular in the shallower areas. The results suggest that this type of reservoir systems are vulnerable to eutrophication during extended drought periods and that a better assessment of the maximum support capacity for reservoir activities, particularly aquaculture, must be re-assessed taking into consideration worst case scenarios forecasted by global climate change. |
| eu_rights_str_mv | openAccess |
| format | article |
| id | anni_bdd56edd7cc2cd78c5e0ff802c25f089 |
| identifier_str_mv | Santos, J.A., et al. Hydrochemistry and trophic state change in a large reservoir in the Brazilian northeast region under intense drought conditions. Journal of Limnology, 2017, 76 (1): 41-51. doi: 10.4081/jlimnol.2016.1433 11295767 10.4081/jlimnol.2016.1433 |
| instacron_str | Universidad de la República |
| institution | Universidad de la República |
| instname_str | Universidad de la República |
| language | eng |
| language_invalid_str_mv | en |
| network_acronym_str | anni |
| network_name_str | oai-lr-anni |
| oai_identifier_str | oai:colibri.udelar.edu.uy:20.500.12008/22063 |
| publishDate | 2017 |
| publishDateSort | 2017 |
| publisher.none.fl_str_mv | Page Press Publications |
| reponame_str | COLIBRI |
| repository.mail.fl_str_mv | |
| repository.name.fl_str_mv | |
| repository_id_str | |
| rights_invalid_str_mv | Licencia Creative Commons Atribución – No Comercial (CC -BY-NC 4.0) |
| spelling | Hydrochemistry and trophic state change in a large reservoir in the Brazilian northeast region under intense drought conditionsSantos, J. A.Marins, R. V.Aguiar, J. E.Chalar Marquisá, GuillermoSilva, F. A. T. F.Lacerda, L. D.EutrophicationReservoirSemiaridTrophic state indexThe study shows changes on physical and chemical water parameters and of trophic state in a large reservoir in the Brazilian semiarid region following decreasing reservoir volume due to rainfall shortage during four consecutive years. The monitoring period, between November 2011 and May 2014, assessed approximately 50% water volume reduction and 10 meters’ decrease of reservoir water level that degraded water quality. Decrease in reservoir volume, strong evaporation and the permanent influence of anthropogenic activities, favored the concentration of salts and accumulation of nutrients and of increasing pH. Thermal stratification of the water column occurred when volume was maximum and lead to a significant reduction in dissolved oxygen in the hypolimnion (0.07 to 2.62 mg L–1). Diminishing volume resulted in mixing of the hypolimnion nutrient-rich and oxygen-poor waters in the entre water column and changed the initial oligotrophic condition to eutrophic. However, the temporal scale of the response of the reservoir’s trophic state differs in the different areas of the reservoir. Whereas deeper areas accumulating nutrients from aquaculture and agriculture progressively became mesotrophic and eventually eutrophic; shallower regions far from direct anthropogenic influences, changed their trophic sate much later, but rapidly turned into super-eutrophic conditions, probably due to more intense sediment resuspension and water mixing. Trophic State Index followed nutrient increase during most of the period. However, it also responded to an increase in chlorophyll a concentrations when the reservoir achieved its minimum volume, in particular in the shallower areas. The results suggest that this type of reservoir systems are vulnerable to eutrophication during extended drought periods and that a better assessment of the maximum support capacity for reservoir activities, particularly aquaculture, must be re-assessed taking into consideration worst case scenarios forecasted by global climate change.Page Press PublicationsChalar Marquisá, Guillermo. Universidad de la República (Uruguay). Facultad de Ciencias. Instituto de Biología2019-10-02T22:12:08Z2019-10-02T22:12:08Z201720190930Artículoinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfSantos, J.A., et al. Hydrochemistry and trophic state change in a large reservoir in the Brazilian northeast region under intense drought conditions. Journal of Limnology, 2017, 76 (1): 41-51. doi: 10.4081/jlimnol.2016.143311295767https://hdl.handle.net/20.500.12008/2206310.4081/jlimnol.2016.1433reponame:COLIBRIinstname:Universidad de la Repúblicainstacron:Universidad de la RepúblicaenengJournal of Limnology, 2017, 76 (1): 41-51Las obras depositadas en el Repositorio se rigen por la Ordenanza de los Derechos de la Propiedad Intelectual de la Universidad De La República. (Res. Nº 91 de C.D.C. de 8/III/1994 – D.O. 7/IV/1994) y por la Ordenanza del Repositorio Abierto de la Universidad de la República (Res. Nº 16 de C.D.C. de 07/10/2014)info:eu-repo/semantics/openAccessLicencia Creative Commons Atribución – No Comercial (CC -BY-NC 4.0)oai:colibri.udelar.edu.uy:20.500.12008/220632026-04-14T10:09:18Z |
| spellingShingle | Hydrochemistry and trophic state change in a large reservoir in the Brazilian northeast region under intense drought conditions Santos, J. A. Eutrophication Reservoir Semiarid Trophic state index |
| status_str | publishedVersion |
| title | Hydrochemistry and trophic state change in a large reservoir in the Brazilian northeast region under intense drought conditions |
| title_full | Hydrochemistry and trophic state change in a large reservoir in the Brazilian northeast region under intense drought conditions |
| title_fullStr | Hydrochemistry and trophic state change in a large reservoir in the Brazilian northeast region under intense drought conditions |
| title_full_unstemmed | Hydrochemistry and trophic state change in a large reservoir in the Brazilian northeast region under intense drought conditions |
| title_short | Hydrochemistry and trophic state change in a large reservoir in the Brazilian northeast region under intense drought conditions |
| title_sort | Hydrochemistry and trophic state change in a large reservoir in the Brazilian northeast region under intense drought conditions |
| topic | Eutrophication Reservoir Semiarid Trophic state index |
| url | https://hdl.handle.net/20.500.12008/22063 |