EurekaMag
+ Translate
+ Most Popular
Gaucher's disease;thirty-two years experience at Siriraj Hospital
A study of Macrobathra Meyrick from China (Lepidoptera, Cosmopterigidae)
First occurrence in ores of tetragonal chalcocite
Effects of trace element nutrition on sleep patterns in adult women
N.Z. range management guidelines. 2. Design of grazing management systems for tussock country
A case of lipoma of the esophagus
A revision of world Acanthosomatidae (Heteroptera: Pentatomidae): keys to and descriptions of subfamilies, tribes and genera, with designation of types
Life history of the coronate scyphozoan Linuche unguiculata (Swartz, 1788)
Perceptual restoration of obliterated sounds
Mutagenicity studies on two chromium(III) coordination compounds
The formation of the skeleton. I. Growth of a long bone. 1st appearance of a center of calcification
Leucopenia and abnormal liver function in travellers on malaria chemoprophylaxis
The joint commission: four key root causes loom large in sentinel event data
Treatment of vitiligo with topical 15% lactic acid solution in combination with ultra violet-A
Behaviour of dairy cows within three hours after feed supply: I. Influence of housing type and time elapsing after feed supply
Observations of the propagation velocity and formation mechanism of burst fractures caused by gunshot
Management and control of patients with type 2 diabetes mellitus in Lebanon: results from the International Diabetes Management Practices Study (IDMPS)
The diet composition and nutritional knowledge of patients with anorexia nervosa
Physoporella croatica Herak, 1958 of the Slovak karst Anisian (Slovakia, the West Carpathians Mts.)
Bright lights, big noise. How effective are vehicle warning systems?
Ein Plesiosaurier-Rest mit Magensteinen aus mittlerem Lias von Quedlinburg
Incidence of Chlamydia trachomatis in patients with sterility
Monster soup: the microscope and Victorian fantasy
Preliminary tests with residual sprays against poultry lice
Duration of the life of plants in phylogeny

Effect of reservoir drawdown on biomass of three species of aquatic macrophytes in a large sub-tropical reservoir (Itaipu, Brazil)


Effect of reservoir drawdown on biomass of three species of aquatic macrophytes in a large sub-tropical reservoir (Itaipu, Brazil)



Hydrobiologia 570(1): 53-59



ISSN/ISBN: 0018-8158

DOI: 10.1007/s10750-006-0161-9

The biomass and maximum depth of colonization (Zmax) of Egeria najas Planchon (submerged), and the biomass and area covered by a stand of Eichhornia crassipes (Mart.) Solms and Salvinia herzogii Raddi (floating species) were assessed to measure the effects of a 5 m drawdown in water level of the Itaipu Reservoir (Brazil–Paraguay), which lasted about 3 months. The frequency of occurrence of the two first species, and of Salvinia spp was also assessed in the main arms of the reservoir. A conspicuous decrease of E. najas biomass was observed and this attribute did not reach the previous values even 10 months after the water level had returned to normal. Rapid growth of free-floating species (surface tdoub = 2.9 and 3.2 days for total biomass of S. herzogii and E. crassipes, respectively, and 2.3 days for surface area covered by both species) was recorded immediately after the water level returned to normal. This fast growth was related to phosphorus increases in water. A clear succession was observed over a period of 103 days, during which S. herzogii was slowly substituted by E. crassipes. The effects of water level drawdown were also observed on E. najas frequency, given that this species occurred in 38% of the stands investigated before the water drawdown, but in only 9 and 6% of stands following 1 and 10 months of water level recovery, respectively. Water drawdown did not affect the frequency of occurrence of the floating species, which remained approximately constant, and lower than 15% in several of the reservoir arms investigated.

Please choose payment method:






(PDF emailed within 0-6 h: $19.90)

Accession: 018806175

Download citation: RISBibTeXText

Related references

Effect of reservoir drawdown on biomass of three species of aquatic macrophytes in a large sub-tropical reservoir (Itaipu, Brazil). International Symposium on Aquatic Weeds (11 ; Moliets, Maa 2002) 570: 53-59, 2006

Species richness and beta diversity of aquatic macrophytes in a large subtropical reservoir (Itaipu Reservoir, Brazil): The influence of limnology and morphometry. Hydrobiologia 505: 119-128, 2003

Aquatic macrophytes in the large, sub-tropical Itaipu Reservoir, Brazil. Revista de Biologia Tropical 58(4): 1437-1451, 2010

Aquatic macrophytes of Itaipu Reservoir, Brazil: Survey of species and ecological considerations. Brazilian Archives of Biology and Technology 42(1): 15-22, 1999

Spatial and temporal gradients in artisanal fisheries of a large Neotropical reservoir, the Itaipu Reservoir, B brazil. Canadian Journal of Fisheries and Aquatic Sciences 62(3): 714-724, 2005

Spatial and temporal gradients in artisanal fisheries of a large Neotropical reservoir, the Itaipu Reservoir, Brazil. Canadian Journal of Fisheries and Aquatic Sciences ch; 62(3): 714-724, 2005

Aquatic macrophytes in a tropical African reservoir diversity, communities and the impact of reservoir-level fluctuations. Transactions of the Royal Society of South Africa 67(3): 117-125, 2012

Environmental analysis of the eutrophication and spread of aquatic macrophytes in a tropical reservoir: a case study in Brazil. Environmental Science and Pollution Research International 2022, 2022

Prediction of Egeria najas and Egeria densa occurrence in a large subtropical reservoir (Itaipu Reservoir, Brazil-Paraguay). Aquatic Botany 83(3): 227-238, 2005

Relationships between environmental factors, periphyton biomass and nutrient content in Garas Reservoir, a hypereutrophic tropical reservoir in southeastern Brazil. Lakes and Reservoirs: Research and Management 15(2): 129-137, 2010

Aquatic macrophyte distribution in relation to water and sediment conditions in the Itaipu Reservoir, Brazil. International Symposium on Aquatic Weeds (10 ) 415: 147-154, 1999

Aquatic macrophyte distribution in relation to water and sediment conditions in the Itaipu Reservoir, Brazil. Hydrobiologia 415: 147-154, 1999

Structure of fish assemblages along spatial gradients in a deep subtropical reservoir (Itaipu Reservoir, Brazil-Paraguay border). Environmental Biology of Fishes 72(3): 283-304, 2005

Distribution and biomass of aquatic macrophytes in an abandoned nuclear cooling reservoir. Aquatic Botany 35(2): 133-152, 1989

Itaipu. Basic geopolitical and energy situation. Socio-economic and ecological consequences of the Itaipu dam and reservoir on the Rio Parana (Brazil/Paraguay). Itaipu Basic geopolitical and energy situation Socio economic and ecological consequences of the Itaipu dam and reservoir on the Rio Parana Brazil/Paraguay: 100, 1987