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Eighteen species of cladocerans are recorded from a temporary pond in northern Colombia; 12 of these records are new for La Guajira Department: Diaphanosoma brevireme Sars, 1901, D. dentatum Herbst, 1968, Sarsilotona serricauda (Sars, 1901), Moina micrura micrura Kurz, 1874, M. reticulata Daday, 1905, Grimaldina freyi Neretina and Kotov, 2017, Kurzia polyspina Hudec, 2000, Leydigia cf. striata Birabén, 1939, Ovalona cf. glabra (Sars, 1905), Chydorus nitidulus (Sars, 1901), Dunhevedia crassa King, 1853 and Pseudosida sp.; this latter taxon could be an yet undescribed species. The cladoceran fauna from the surveyed area is represented mostly by widespread species and commonly found in the Neotropical regions, but local morphological data are scarce in the regional literature. Brief diagnostic descriptions of the species recorded for the Colombian cladoceran fauna are provided together with illustrations of taxonomically significant appendages, morphological remarks, notes on the variability of some species, and their distribution., Dieciocho especies de cladóceros son registrados de una charca temporal al norte de Colombia; 12 de estos registros son nuevos para el departamento de la Guajira: Diaphanosoma brevireme Sars, 1901, D. dentatum Herbst, 1968, Sarsilotona serricauda (Sars, 1901), Moina micrura micrura Kurz, 1874, M. reticulata Daday, 1905, Grimaldina freyi Neretina and Kotov, 2017, Kurzia polyspina Hudec, 2000, Leydigia cf. striata Birabén, 1939, Ovalona cf. glabra (Sars, 1905), Chydorus nitidulus (Sars, 1901), Dunhevedia crassa King, 1853 y Pseudosida sp; este último taxón podría ser un especie todavía no descrita para la ciencia. La fauna de cladóceros del área estudiada está principalmente representada por especies de amplia distribución y comúnmente encontradas en la región Neotropical, pero la información local morfológica de estas especies reportadas son escasas en la literatura regional. Se proporcionan breves descripciones diagnosticas de las especies registradas para la fauna de cladóceros colombianos, juntos con ilustraciones de apéndices taxonómicamente importantes, comentarios morfológicos, notas de variabilidad de algunas especies y su distribución.

Un muestreo extensivo de 202 masas de agua leníticas (lagos, lagunas y charcas), ubicadas entre 3,150 y 4,460 m s.n.m. en el Parque Nacional Cajas (Andes Australes de Ecuador), ha puesto de manifiesto el elevado interés que tienen estos enclaves de alta montaña en latitudes tropicales para la investigación de aspectos faunísticos y ecológicos de la fauna de branquiópodos. Los primeros resultados han permitido reconocer 21 especies, 15 de ellas nuevas para Ecuador, de las cuales 2 están en proceso de descripción para ser publicadas como nuevas para la Ciencia. Todas las especies son propias de aguas poco mineralizadas y oligotróficas, 8 de ellas aparecen en el plancton y el resto en el bentos litoral. Extensive sampling of 202 lentic water bodies (lakes, lagoons and ponds) located between 3150 and 4460 m a.s.l. in the Cajas National Park (South Ecuadorian Andes) has revealed the high interest of these mountain enclaves in tropical latitudes for the investigation of faunal and ecological aspects of the branchiopod fauna. The first results allowed to recognize 21 species, 15 of them new to Ecuador, of which 2 are in process of description to be published as new to science. All species are characteristic of little mineralized and oligotrophic waters, 8 of them appear in the plankton and the rest in the limnetic littoral benthos. Cuenca volumen 8, número 1

The presence of the branchiopod Lepidurus apus in Asturias province (Spain) is reported., ATB disfruta de un contrato PTA-MICINN cofinanciado por Plan Nacional de I+D+i, Fondo Social Europeo y el PCTI Asturias (PTA2010-4108-I).

The nutritional contribution from co-fed Artemia nauplii and inert diets to growth in mysis and early postlarval shrimp Litopenaeus vannamei was assessed by analyzing the carbon stable isotope ratios (δ13C) in diets and shrimp tissue. Artemia nauplii and inert diets showed significantly different δ13C values but similar carbon contents and were supplied as single diets and also in three co-feeding regimes in which 25, 50 and 75% of the Artemia was replaced by inert diet on a dry weight basis, so that all feeding regimes provided similar amounts of dietary carbon. Shrimp δ13C values were significantly influenced by the different feeding regimes and reached isotopic equilibrium with their respective diets as soon as 5days. Survival was significantly higher in co-fed animals than in those fed either Artemia or inert diet alone. There was no significant difference in growth between shrimp fed on Artemia only and those co-fed Artemia with inert diet, although the variability was high. Growth and survival were very low in shrimp fed only inert diet. Results from an isotope mixing model suggest that observed nutrient contributions from Artemia nauplii were significantly higher than expected contributions indicated by proportions established in the co-feeding regimes. From mysis 3 to postlarvae 5, nutrient contributions to growth in the dietary regime providing equal carbon amounts of each diet type ranged from 73 to 87% for Artemia and from 13 to 27% for inert diet. Shrimp fed the 25% Artemia replacement regime exhibited a significantly higher retention of dietary carbon from the inert diet than those fed inert diet alone. This may have resulted from greater ingestion and/or assimilation of the inert diet in the presence of Artemia, combined with the higher growth rate supported by co-feeding. The results demonstrate the effectiveness of up to 50% replacement of Artemia with inert diet for L. vannamei mysis and early postlarval stages, indicating also that the inert diet may provide specific nutrients that promote higher survival, while digestibility may limit its contribution to tissue growth. The isotopic influence of maternal nutrients and dietary sources on earlier larval stages was also described.