Results 131 to 140 of about 4,782 (244)

Survival of Ceriodaphnia dubia (Crustacea, Cladocera) exposed to different screens against natural ultraviolet radiation [PDF]

open access: yes, 2011
The current increase of penetration of natural ultraviolet radiation (UVR) in southern South America affects water bodies because the UVR can penetrate the water column.
Acevedo, P.   +2 more
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Biodiversity in drinking water distribution systems:a brief review [PDF]

open access: yes, 1997
In drinking water distribution systems, three groups of living organisms are usually found in the biofilm and circulating water: heterotrophic bacteria, free-living protozoa, and macro-invertebrates.
Block, J.C.   +5 more
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Efficiency of nitrogen fertilizers for rice [PDF]

open access: yes, 1987
The photosynthetic biomass that develops in the floodwater of wetland rice fields affects nitrogen dynamics in the ecosystem. This review summarizes available data on the nature, productivity, and composition of the photosynthetic aquatic biomass, and ...
Grant, I.F.   +3 more
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Identification key for the Brazilian species and subspecies of the family Ilyocryptidae (Crustacea, Branchiopoda, Anomopoda)

open access: yesPapéis Avulsos de Zoologia
In recent years, an increase in knowledge about the diversity and biogeography of Brazilian Cladocera fauna has been evident. To keep up with these changes, it is opportune to carry out an update of the taxonomy and biogeography for the main cladoceran ...
Francisco Diogo Rocha Sousa   +1 more
doaj   +1 more source

A Primary Ecological Survey of Dardanelle Reservoir Prior to Nuclear Facility Effluent Discharge [PDF]

open access: yes, 1978
A preliminary ecological survey of Dardanelle Reservoir during the construction phase of Arkansas Power and Light Company\u27s nuclear generating facility was conducted from January 1970 through June 1974.
Sinclair, Clarence B., Watson, Robert L.
core   +2 more sources

Feeding Ecology of the Relict Fish Gymnocharacinus-Bergi, a Characid from Southern South-America [PDF]

open access: yes, 1999
Fil: Escalante, Alicia H.. Universidad Nacional de Mar del Plata. Mar del Plata; ArgentinaFil: Menni, Roberto Carlos. División Zoología Vertebrados. Facultad de Ciencias Naturales y Museo.
Escalante, Alicia H.   +1 more
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Evaluating RNAlater® as a preservative for using near-infrared spectroscopy to predict Anopheles gambiae age and species. [PDF]

open access: yes
Mosquito age and species identification is a crucial determinant of the efficacy of vector control programmes. Near-infrared spectroscopy (NIRS) has previously been applied successfully to rapidly, non-destructively, and simultaneously determine the age ...
Dowell, Floyd E   +8 more
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The trophic ecology of the red swamp crayfish (Procambarus clarkii) in Mediterranean aquatic ecosystems : a stable isotope study [PDF]

open access: yes, 2013
The red swamp crayfish(Procambarus clarkii)is an invasive species in most of its current distribution range.As an omnivorous species that feeds on items of many trophic levels and is eaten by many others, it occupies a key trophic position within the ...
Alcorlo, Paloma   +2 more
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Estrutura da assembléia de microcrustáceos (Cladocera e Copepoda) em um reservatório do semi-árido Neotropical, Barragem de Pedra, Estado da Bahia, Brasil = Structure of microcrustaceans assemblage (Cladocera and Copepoda) from Neotropical semiarid reservoir, Barragem de Pedra, Bahia State, Brazil

open access: yesActa Scientiarum: Biological Sciences, 2009
Na região semi-árida, os reservatórios desempenham importante papel para o desenvolvimento regional, o que resulta no aumento da pressão antrópica no seu entorno, acarretando mudanças na qualidade da água.
Nadson Ressyé Simões   +1 more
doaj  

Cambios nictemerales en la distribución vertical de algunos microcrustáceos en un lago artificial del neotrópico (Colombia) [PDF]

open access: yes, 2007
En el Lago Acuarela, un sistema artificial de poca profundidad, se analizó la distribución vertical diaria de los microcrustáceos planctónicos y su relación con algunas variables físicas y químicas. Se evaluaron cuatro ciclos nictemerales a intervalos de
Estrada-Posada, Ana L.   +2 more
core  

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