A test of hypotheses relating to the comparative limnology and assessment of eutrophication in semi-arid man-made lakes

Thornton, J. A.; Rast, Walter

doi:10.1007/978-94-017-1096-1_1

Cited by 50 publications

(60 citation statements)

References 11 publications

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“…The values of P in Gargalheiras ( Figure 5) and Cruzeta ( Figure 6) were very high throughout the study period; mean values are presented in Table 1. TP in both reservoirs presented values above the standard limit for eutrophication (50 µg.L -1 ) (Thornton & Rast, 1993).…”

Section: Resultsmentioning

confidence: 99%

Phosphorus dynamics in the water of tropical semiarid reservoirs in a prolonged drought period

2018

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Section: Resultsmentioning

confidence: 99%

Phosphorus dynamics in the water of tropical semiarid reservoirs in a prolonged drought period

2018

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“…According to the trophic classification criteria for semi-arid regions, concentrations above 60 ug.L -1 of total phosphorus and 12 ug.L -1 of Chl a are indicative of a eutrophic state (Thornton and Rast, 1993 . The frequent changes in trophic state in these reservoirs are an important selective factor for the success of potentially colonising species in such environments.…”

Section: Discussionmentioning

confidence: 99%

Zooplankton assemblages in eutrophic reservoirs of the Brazilian semi-arid

Menezes

et al. 2013

Braz. J. Biol.

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Species composition, density, and temporal dynamics of zooplankton were studied in six reservoirs in a semi-arid region in tropical northeastern Brazil (Rio Grande do Norte state). All the reservoirs are highly eutrophic, with high contents of total nitrogen (minimum of 1200 µg.L -1 ) and total phosphorus (minimum of 10 µg.L -1 ), and extremely high algal biomass was registered (surpassing 20 µg Chl a.L -1). All the reservoirs showed an enduring condition of high turbidity and phytoplankton assemblages dominated by cyanobacteria. Zooplankton also showed quantitative patterns suggestive of eutrophic conditions, expressed by high densities, mainly in Passagem das Traíras and Sabugi reservoirs. A spatial differentiation in the composition of the zooplankton community was registered. Rotifers (especially Keratella tropica, Brachionus havanensis, and Keratella americana) were the dominant forms in the zooplankton community of Itans, Passagem das Traíras, and Sabugi reservoirs, while calanoid copepods (mainly Notodiaptomus cearensis) dominated in the Armando Ribeiro, Gargalheiras, and Parelhas systems. The existence of novel relationships in zooplankton community composition in eutrophic reservoirs in this tropical semi-arid region must be considered in designating zooplankton indicators of eutrophic conditions. Keywords: reservoirs, semi-arid, zooplankton, eutrophication. Assembléias zooplanctônicas em reservatórios eutróficos do semiárido brasileiro ResumoA composição de espécies, a densidade e a dinâmica temporal do zooplâncton foram estudadas em seis reservatórios de uma região semiárida no nordeste do Brasil (Estado do Rio Grande do Norte). Todos os reservatórios estão altamente eutróficos, com altas concentrações de nitrogênio total (mínimo de 1.200 µg.L -1 ) e fósforo total (mínimo de 10 µg.L -1), e biomassa algal extremamente alta (muitas vezes, superando 20 µg.L -1 de Chl a). Todos os reservatórios apresentaram alta turbidez e assembleias fitoplanctônicas dominadas por cianobactérias. O zooplâncton também apresentou padrões quantitativos sugestivos de condições eutróficas, expressas por altas densidades, principalmente nos Reservatórios Passagem das Traíras e Sabugi. Foi registrada uma diferenciação espacial na composição da comunidade zooplanctônica. Rotíferos (especialmente Keratella tropica, Brachionus havanensis e Keratella americana) foram as formas dominantes na comunidade zooplanctônica dos Reservatórios Itans, Passagem das Traíras e Sabugi, enquanto copépodos Calanoida (principalmente Notodiaptomus cearensis) dominaram nos Reservatórios Armando Ribeiro Gonçalves, Gargalheiras e Parelhas. A existência de novas relações na composição da comunidade zooplanctônica em reservatórios eutróficos dessa região semiárida tropical deve ser considerada no estabelecimento de indicadores zooplanctônicos de condições eutróficas.Palavras-chave: reservatórios, semiárido, zooplâncton, eutrofização.

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“…The ratio of catchment area to maximum lake area is 164, the largest ratio among the case study lakes (Table 1). A large catchment to surface area ratio is characteristic of semi-arid manmade lakes (Thornton & Rast, 1993), which together with their lengthy water residence time (from months to years) makes these systems highly vulnerable to eutrophication and siltation due to high retention of nutrients and sediments exported from the catchment. Over the last eight decades, the lake has lost one-third of its maximum storage capacity, resulting in an average annual siltation rate of 0.4% (Freitas et al, 2011).…”

Section: Case Studiesmentioning

confidence: 99%

Ecological impacts of global warming and water abstraction on lakes and reservoirs due to changes in water level and related changes in salinity

et al. 2015

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According to the Intergovernmental Panel on Climate Change report released in September 2014, unprecedented changes in temperature and precipitation patterns have been recorded globally in recent decades and further change is predicted to occur in the near future, mainly as the result of human activity. In particular, projections show that the Mediterranean climate zone will be markedly affected with significant implications for lake water levels and salinity. This may be exacerbated by increased demands for irrigation water. Based on long-term data from seven lakes and reservoirs covering a geographical gradient of 52°of latitudes and a literature review, we discuss how changes in water level and salinity related to climate change and water abstraction affect the ecosystem structure, function, biodiversity and ecological state of lakes and reservoirs. We discuss mitigation measures to counteract the negative effects on ecological status that are likely to result from changes in climate and water abstraction practices. Finally, we highlight research required to improve knowledge of the impacts of anthropogenically induced changes on lake water level and consequent changes in salinity.

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A test of hypotheses relating to the comparative limnology and assessment of eutrophication in semi-arid man-made lakes

Cited by 50 publications

References 11 publications

Phosphorus dynamics in the water of tropical semiarid reservoirs in a prolonged drought period

Phosphorus dynamics in the water of tropical semiarid reservoirs in a prolonged drought period

Zooplankton assemblages in eutrophic reservoirs of the Brazilian semi-arid

Ecological impacts of global warming and water abstraction on lakes and reservoirs due to changes in water level and related changes in salinity

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