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Search Results: 1 - 10 of 8256 matches for " Pinilla Gabriel "
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PRODUCCIóN PRIMARIA EN UN LAGO DE AGUAS CLARAS DE LA AMAZONíA COLOMBIANA (LAGO BOA)
Pinilla Gabriel
Acta Biológica Colombiana , 2009,
Abstract: Phytoplankton production is one of the most significant aspects in aquatic ecosystems. In this paper primary production of the phytoplankton community was measured (14C method) in a clear water lake in the Colombian Amazon region in different periods of the hydrological cycle. Primary production varied between 0.6 and 2.3 g C m-2 d-1, the last recorded at low water phase. Results show that the phytoplankton community of Lake Boa fluctuates from very low capacity of carbon assimilation during high water but increased four times during low water. The strong change in productivity follows the variation in algal abundance, which in turn reflects changes in water quality conditions during the hydrologic cycle. Thus, the lake passes from oligotrophic conditions during the flooding period to eutrophic conditions when the lake is disconnected from the river at low water phase.
Evaluación de la eficiencia fotosintética del fitoplancton en un lago amazónico (Lago Boa) y en un lago andino (Lago Guatavita)
Pinilla, Gabriel A.;
Acta Amazonica , 2006, DOI: 10.1590/S0044-59672006000200012
Abstract: commonly relation between variable fluorescence and maximum fluorescence (fv/fm) of the algae community has been utilized like a measure of the phytoplanktonic photosynthetic efficiency. such efficiency can be affected by the water bodies' location in different limnological provinces. the goal of this work was to establish the differences in the fv/fm rate between lake boa (150 masl colombian amazon) and lake guatavita (3000 masl, east range in the colombian andes). in general, averages of the photosynthetic efficiencies were low (0.212 to 0.367 and 0.089 to 0.32 in lakes boa and guatavita, respectively), which indicate physiological stress to algae. efficiency was higher in middle waters and changed strongly between sample periods and ecosystems. photoinhibition occurred in superficial waters was greater in lake guatavita. photosynthetic efficiency was smaller in the andean lake do possibly to climatic differences, elevation above sea level and stratification. during laboratory assays efficiency decreased along time, caused probably by the darkness adaptation of the algae. laboratory data confirmed that epilimnetic phytoplankton of the lake guatavia was photoinhibited at the stratification period.
PRODUCCIóN PRIMARIA EN UN LAGO DE AGUAS CLARAS DE LA AMAZONíA COLOMBIANA (LAGO BOA)
PINILLA AGUDELO,GABRIEL ANTONIO;
Acta Biológica Colombiana , 2009,
Abstract: phytoplankton production is one of the most significant aspects in aquatic ecosystems. in this paper primary production of the phytoplankton community was measured (14c method) in a clear water lake in the colombian amazon region in different periods of the hydrological cycle. primary production varied between 0.6 and 2.3 g c m-2 d-1, the last recorded at low water phase. results show that the phytoplankton community of lake boa fluctuates from very low capacity of carbon assimilation during high water but increased four times during low water. the strong change in productivity follows the variation in algal abundance, which in turn reflects changes in water quality conditions during the hydrologic cycle. thus, the lake passes from oligotrophic conditions during the flooding period to eutrophic conditions when the lake is disconnected from the river at low water phase.
La participación en asuntos ambientales y su tutela en el Convenio de Aarhus
Ballesteros-Pinilla,Gabriel;
Vniversitas , 2010,
Abstract: the aarhus convention, as well as envisages a minimum of internal enforcement of the public participation in environmental matters, has enabled the establishment of an innovative compliance mechanism in which the public can bring communications on the noncompliance of the parties. in this paper, afterwards a succinct exposition of the foundation of the public participation in environmental matters and its form of address in aarhus convention, it is explained the domestic enforcement therein prescribed and the aforementioned accomplishment mechanism. as soon as this basis were set up, the noncompliance cases involving public participation settled by the compliance mechanism are analyzed, from which is determined its efficiency in the enforcement of the public participation in environmental matters at the international level.
Relaciones entre las abundancias del bacterioplancton y del fitoplancton en tres ecosistemas lénticos de los Andes Colombianos
Canosa,Amparo; Pinilla,Gabriel;
Revista de Biología Tropical , 2007,
Abstract: relations between bacterioplankton and phytoplankton abundance in three lentic ecosystems in the colombian andes. we analyzed relations among phytoplankton and total bacterioplankton fractions in three lentic ecosystems (neusa and prado dams, and fúquene lagoon) with different physicochemical characteristics, in the andes of colombia. samplings were made in three sites of each water body during three surveys. neusa dam (meso to oligotrophic) had the lowest bacterial concentration; prado dam (eutrophic) had a high bacterial and algal abundance, and the fúquene lagoon (mesotrophic) had lower concentrations of phytoplankton but a high relative concentration of bacteria, probably because of its particular conditions: high organic matter and low nutrient levels in the water. there was a negative correlation of total bacterioplankton with the phytoplankton (pearson=-0.4479, p=0.019, n=27) and a positive correlation between phytoplankton and heterotrophic bacteria (pearson=0.3866, p=0.062, n=24) and between total bacterioplankton and dbo5 (pearson=0.4088, p=0.034, n=27). apparently, total bacterioplankton and phytoplankton were not coupling, but cultivable bacteria and the phytoplankton had some degree of relationship. rev. biol. trop. 55 (1): 135-146. epub 2007 march. 31.
Relaciones entre las abundancias del bacterioplancton y del fitoplancton en tres ecosistemas lénticos de los Andes Colombianos
Amparo Canosa,Gabriel Pinilla
Revista de Biología Tropical , 2007,
Abstract: Analizamos las fracciones de fitoplancton y bacterioplancton en tres ecosistemas lénticos (los embalses de Neusa y Prado y la laguna de Fúquene), con características fisicoquímicas distintas, a fin de verificar el acoplamiento entre estas comunidades. Las muestras se tomaron en tres sitios de cada cuerpo de agua, en tres visitas de muestreo. El embalse de Neusa (meso a oligotrófico) mostró la menor concentración de bacterias; el embalse de Prado (eutrófico) tuvo una alta abundancia, tanto de algas como de bacterias. La laguna de Fúquene (oligo a mesotrófica) tuvo bajas concentraciones de fitoplancton, pero relativamente altas concentraciones de bacterias, debido a sus condiciones particulares de elevada concentración de materia orgánica y cantidades bajas de nutrientes en el agua. Se presentó una relación negativa entre el bacterioplancton total y el fitoplancton (Person= -0.4479, p=0.019, n= 27) y positiva entre el fitoplancton y las bacterias heterótrofas (Pearson= 0.3866, p=0.062, n= 24) y entre las bacterias y la materia orgánica (Pearson= 0.4088, p=0.034, n= 27). El bacterioplancton total y el fitoplancton no mostraron "acoplamiento", pero las bacterias cultivables y el fitoplancton tuvieron algún grado de interrelación. Relations between bacterioplankton and phytoplankton abundance in three lentic ecosystems in the Colombian Andes. We analyzed relations among phytoplankton and total bacterioplankton fractions in three lentic ecosystems (Neusa and Prado dams, and Fúquene lagoon) with different physicochemical characteristics, in the Andes of Colombia. Samplings were made in three sites of each water body during three surveys. Neusa dam (meso to oligotrophic) had the lowest bacterial concentration; Prado dam (eutrophic) had a high bacterial and algal abundance, and the Fúquene lagoon (mesotrophic) had lower concentrations of phytoplankton but a high relative concentration of bacteria, probably because of its particular conditions: high organic matter and low nutrient levels in the water. There was a negative correlation of total bacterioplankton with the phytoplankton (Pearson=-0.4479, p=0.019, n=27) and a positive correlation between phytoplankton and heterotrophic bacteria (Pearson=0.3866, p=0.062, n=24) and between total bacterioplankton and DBO5 (Pearson=0.4088, p=0.034, n=27). Apparently, total bacterioplankton and phytoplankton were not coupling, but cultivable bacteria and the phytoplankton had some degree of relationship. Rev. Biol. Trop. 55 (1): 135-146. Epub 2007 March. 31.
La participación en asuntos ambientales y su tutela en el Convenio de Aarhus The public participation in environmental matters and its enforcement in Aarhus Convention
Gabriel Ballesteros-Pinilla
Vniversitas , 2010,
Abstract: El Convenio de Aarhus, además de prever unos mínimos de protección interna del derecho de participación en asuntos ambientales, ha permitido la creación de un innovador mecanismo de cumplimiento en el que los particulares pueden presentar comunicaciones sobre el incumplimiento de los Estados partes. En este artículo, tras exponer sucintamente el fundamento del derecho de participación en asuntos ambientales y su tratamiento en el Convenio de Aarhus, se explica la tutela interna allí prescrita y el mencionado mecanismo de cumplimiento. Una vez sentadas estas bases, se analizan los casos de incumplimiento del derecho de participación ambiental resueltos por medio de este mecanismo, a partir de lo cual se determina su eficacia para la protección de dicho derecho a escala internacional. The Aarhus Convention, as well as envisages a minimum of internal enforcement of the public participation in environmental matters, has enabled the establishment of an innovative compliance mechanism in which the public can bring communications on the noncompliance of the Parties. In this paper, afterwards a succinct exposition of the foundation of the public participation in environmental matters and its form of address in Aarhus Convention, it is explained the domestic enforcement therein prescribed and the aforementioned accomplishment mechanism. As soon as this basis were set up, the noncompliance cases involving public participation settled by the compliance mechanism are analyzed, from which is determined its efficiency in the enforcement of the public participation in environmental matters at the international level.
Composición, distribución y abundancia de la comunidad fitoplanctónica de la ensenada de Utría, Pacífico colombiano
Pe?a,Viviana; Pinilla,Gabriel A;
Revista de biología marina y oceanografía , 2002, DOI: 10.4067/S0718-19572002000100008
Abstract: with the purpose of characterising the composition, distribution and abundance of the phytoplankton community of the cove of utría, samples from three stations (two coastal and one with oceanic influence) and three depths (surface, secchi and compensation depths), as much as diurnal and nocturnal were collected, during the months of july, august and october of 1995 and february and july of 1996. 218 species were identified, 137 were diatoms, 73 dinoflagellates, 5 cyanophytes and 3 silicoflagellates. within this community appeared estuarine, coastal and oceanic species. main differences occurred between samplings, while stations, depths and day-night changes were less marked. entrances of the continental and marine waters, tide regime and washing of beaches, especially from the mangrove zones, probably caused these differences
Growth, feeding and reproduction of the catfish Eremophilus mutisii (Pisces: Trichomycteridae), from artificial reservoirs in Colombia
Pinilla,Gabriel; Abril,Maritza; González,Esperanza;
Revista de Biología Tropical , 2006,
Abstract: the catfish, eremophilus mutisii, was cultured under different densities in artificial rainfall reservoirs at caldas, boyacá, colombia. at capture, the average total length of the animals was 10 cm and the weight ranged between 9 and 10 g. these fish were in initial stages of sexual development. after a year in the reservoirs, they had increased in length and weight as follows (densities in parentheses): 5.22 cm and 27.23 g (0.5 individuals/m2)); 1.98 cm and 8.79 g (1 individual/m2), and 2.45 cm and 0.82 g (2 individuals/m2). they were at the early stages of sexual maturity, and their condition factor fluctuated between 0.61 and 0.96. they preferably ingested insect larvae that were found in benthic and littoral communities of the reservoirs. the benthos was dominated by ephippia of daphnia, lumbriculids, and chironomid larvae. the biomass of benthic organisms ranged between 0.1126 and 1.3847 g/m2. in the littoral community aquatic insects were the most important component, especially the hemipterans. the biomass of the littoral fauna ranged between 0.14 and 4.05 g/m2. rev. biol. trop. 54(2): 589-597. epub 2006 jun 01.
Growth, feeding and reproduction of the catfish Eremophilus mutisii (Pisces: Trichomycteridae), from artificial reservoirs in Colombia
Gabriel Pinilla,Maritza Abril,Esperanza González
Revista de Biología Tropical , 2006,
Abstract: The catfish, Eremophilus mutisii, was cultured under different densities in artificial rainfall reservoirs at Caldas, Boyacá, Colombia. At capture, the average total length of the animals was 10 cm and the weight ranged between 9 and 10 g. These fish were in initial stages of sexual development. After a year in the reservoirs, they had increased in length and weight as follows (densities in parentheses): 5.22 cm and 27.23 g (0.5 individuals/m2)); 1.98 cm and 8.79 g (1 individual/m2), and 2.45 cm and 0.82 g (2 individuals/m2). They were at the early stages of sexual maturity, and their condition factor fluctuated between 0.61 and 0.96. They preferably ingested insect larvae that were found in benthic and littoral communities of the reservoirs. The benthos was dominated by ephippia of Daphnia, lumbriculids, and chironomid larvae. The biomass of benthic organisms ranged between 0.1126 and 1.3847 g/m2. In the littoral community aquatic insects were the most important component, especially the hemipterans. The biomass of the littoral fauna ranged between 0.14 and 4.05 g/m2. Rev. Biol. Trop. 54(2): 589-597. Epub 2006 Jun 01. El "capitán de la sabana", Eremophilus mutisii (Humboldt, 1805), fue cultivado en diferentes densidades en peque os lagos artificiales localizados en Caldas, Boyacá, Colombia. Al inicio, el promedio de la longitud corporal fue 10 cm y el peso osciló entre 9 y 10 gr. Los peces se encontraban en estados iniciales de desarrollo sexual. Luego de un a o de experimentación, los peces cultivados a una densidad de 0.5 ind/m2 incrementaron 5.22 cm en longitud y 27.23 gr en promedio (1 ind/m2: 1.98 cm y 8.79 gr; 2 ind/m2: 2.45 cm y 0.82 gr). Los peces se encontraban iniciando su madurez sexual, y su factor de condición fluctuó entre 0.61 y 0.96 y consumían principalmente larvas de insectos. El bentos estaba dominado por efipios de Daphnia, lumbricúlidos y larvas de quironómidos. La biomasa de organismos benticos osciló entre 0.1126 y 1.3847 gr/m2. En la comunidad litoral, los insectos acuáticos fueron los componentes mas importantes, especialmente los hemípteros. La biomasa de la fauna litoral osciló entre 0.14 y 4.05 gr/m2.
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