Duas novas espécies do gênero Imparfinis são descritas da região transandina da Colômbia. Imparfinis timana é diagnosticada por possuir as nadadeiras adiposa e anal compridas (24,6-31,3% e 12,4-15,5% no CP, respectivamente), 5-6 rastros branquiais no primeiro ceratobranquial, 42-43 vértebras, além de outros caracteres de morfometria. Imparfinis usmai é diferenciada pela combinação do primeiro raio da nadadeira dorsal longo, mas não projetado como um filamento comprido, nadadeira adiposa longa (21,1-27,0% na CP), barbilhões maxilares ultrapassando a base da nadadeira ventral, 39-40 vértebras, lóbulo superior da nadadeira caudal pontiagudo e mais longo que o lóbulo inferior, lóbulo inferior arredondado, 7-8 rastros branquiais no primeiro ceratobranquial e outros caracteres de morfometria. Imparfinis timana é conhecida somente para o rio Guarapas, pequeno tributário da bacia do alto rio Magdalena. Imparfinis usmai é amplamente distribuída nas bacias dos rios Cauca, Magdalena e Patía. A distribuição restrita de I. nemacheir nas bacias da região transandina (Atrato, Magdalena e Lago de Maracaibo) é discutida.

Two new species of Imparfinis are described from the trans-Andean region of Colombia. Imparfinis timana is diagnosed by having longer anal fin base (12.4-15.5% in SL), in combination with long adipose fin (24.6-31.3% in SL), 5-6 gill rakers on the first ceratobranchial, 42-43 vertebrae and additional measurements. Imparfinis usmai is distinguished by the combination of first ray of dorsal fin longest, but not projected as a long filament, long adipose fin (21.1-27.0% in SL), maxillary barbel exceeding pelvic-fin base, 39-40 vertebrae, upper caudal-fin lobe pointed and longer than lower lobe, lower lobe rounded, 7-8 gill rakers on the first ceratobranchial, as well as additional measurements. Imparfinis timana is only known from río Guarapas, a small tributary of the upper course of the río Magdalena. Imparfinis usmai is broadly distributed in the upper basin of ríos Cauca and Magdalena, and in the lower Patía river basin. The restricted distribution of I. nemacheir to trans-Andean drainages (Atrato, Magdalena, and Lago de Maracaibo) is also discussed.

Globalization is not merely a competition for market shares and well-timed economic growth initiatives; neither is it just a matter of trade opportunities and liberalization. It has also evolved into a social and political struggle for imposing cultural values and individual preferences. Based on this broader context, this paper adopts the following assumption: transnational networks of social movements are the expression of a new social subject and have shifted their scale of political intervention since the 1990s in order to make their fight for social justice a politically pertinent action. Global social justice has become the motto of transnational social movements in world politics, where political decisions no longer rely exclusively on nation-states. In pursuance of developing this assumption, this paper approaches the discussion in two general parts: firstly, it presents a theoretical and methodological approach for analysing transnational social movements; secondly, it looks into the World Social Forum as one of their key political expressions.

Abstract Globalization is not merely a competition for market shares and well-timed economic growth initiatives; neither is it just a matter of trade opportunities and liberalization. It has also evolved into a social and political struggle for imposing cultural values and individual preferences. Based on this broader context, this paper adopts the following assumption: transnational networks of social movements are the expression of a new social subject and have shifted their scale of political intervention since the 1990s in order to make their fight for social justice a politically pertinent action. Global social justice has become the motto of transnational social movements in world politics, where political decisions no longer rely exclusively on nation-states. In pursuance of developing this assumption, this paper approaches the discussion in two general parts: firstly, it presents a theoretical and methodological approach for analysing transnational social movements; secondly, it looks into the World Social Forum as one of their key political expressions. welltimed well timed initiatives liberalization preferences context assumption s action politics nationstates. nationstates nation states. states nation-states parts firstly secondly expressions

Los Cladocera son organismos microfiltradores con un alto potencial para ser utilizados como alimento vivo de diversas especies de peces, tanto en acuarismo como en piscicultura intensiva. Por esta razón es importante el estudio de las tasas de filtración e ingestión de Simocephalus vetulus (Müller, 1776), alimentado con las microalgas de agua dulce Selenastrum capricornutum Printz, 1914 y Chlorella vulgaris Beijerinck, 1890 en concentraciones que van desde 4 hasta 500×10(4)cel/ml. Los valores de las tasas de ingestión más elevados (1,04-1,92×10(6)cel/ind/h) se encontraron en los tratamientos donde la densidad alimenticia que se ofreció fue entre 3 y 5×10(6)cel/ml, mientras que las tasas de filtración más altas se obtuvieron en las concentraciones de alimento menores entre 4 y 64×10(4)cel/ml. En cuanto al tipo de fitoplancton se encontró que S. vetulus filtró mayores volúmenes de agua (8,96ml/ind/h), cuando se le alimentó con C. vulgaris que con S. capricornutum (2,02ml/ind/h). Así mismo, se observó una mayor ingestión de células de C. vulgaris (6,45×10(5)cel/ind/h) que de S. capricornutum (4,01×10(5)cel/ind/h).

Cladocera are microfiltering organisms, with a high potential to be used as alive food by diverse fish species, both in ornamental fish and intensive aquaculture. Therefore it is important the study of filtration and ingestion rates of Simocephalus vetulus (Müller, 1776), fed with fresh water green algae Selenastrum capricornutum Printz, 1914 and Chlorella vulgaris Beijerinck, 1890 in concentrations of 4-500×10(4)cel/ml. The highest ingestion rates (1.04-1.92×10(6)cel/ind/h) were found in the highest densities of phytoplankton, of 3-5×10(6)cel/ml, whereas highest filtration rates were obtained in the lower food concentrations, between 4 and 64×10(4)cel/ml. Regarding the type of phytoplankton, it was found that S. vetulus filtered greater volumes of water (8.96ml/ind/h), when it was fed with C. vulgaris than S. capricornutum (2.02ml/ind/h). Also, a greater ingestion of cells of C. vulgaris (6.45×10(5)cel/ind/h) than S. capricornutum (4.01×10(5)cel/ind/h) was observed.

Os Cladocera são organismos microfiltradores com un alto potencial para serem utilizados como alimento vivo de diversas espécies de peixes, tanto em aquarismo como em piscicultura intensiva. Por esta razão é importante o estudo das taxas de filtração e ingestão de Simocephalus vetulus (Müller, 1776), alimentado com as microalgas de agua doce Selenastrum capricornutum Printz, 1914 e Chlorella vulgaris Beijerinck, 1890 em concentrações que vão desde 4 até 500×10(4) cel/ml. Os valores das taxas de ingestão mais elevados (1,04-1,92×10(6) cel/ind/h) se encontraram nos tratamentos onde a densidade alimentícia oferecida foi entre 3 e 5×10(6) cel/ml, enquanto que as taxas de filtração mais altas se obtiveram nas concentrações de alimento menores entre 4 e 64×10(4) cel/ml. Em relação ao tipo de fitoplâncton, se encontrou que S. vetulus filtrou maiores volumes de agua (8,96 ml/ind/h), quando alimentado com C. vulgaris que com S. capricornutum (2,02 ml/ind/h). Assim mesmo, se observou uma maior ingestão de células de C. vulgaris (6,45×10(5) cel/ind/h) que de S. capricornutum (4,01×10(5) cel/ind/h).