Effects of aquatic vegetation on the spatial distribution of grundulus bogotensis, humboldt 1821 (characiformes: characidae)

G. bogotensis has a geographic distribution restricted to the Colombian Cundiboyacenseplateau, it is listed as near threatened, and research on its autoecology is scarce. Threecollections were made in 2006 in the Fúquene Lake, Cundinamarca, Colombia (5°27’ 55’’ N, 75° 46’ 19’’ W) to describe the habitats occupied by G. bogotensis and todetermine its vertical and horizontal distribution. Three sampling zones were selectedaccording to the type of dominant macrophyte (Eichornia crassipes, Schoenoplectussp. and Egeria densa). In each sampling zone two different cylindrical sampling traps(cloth and PVC) were placed at three depths: surface, mid-depth and bottom. Threereplicates were used for each depth and type of trap. Traps were exposed for 24 hoursand checked every 6 hours. In addition to the traps, sampling by electrofishing wasconducted in each sampling zone during every month. To characterize the study area,physical and chemical variables were analyzed and the structure of phytoplankton,zooplankton, periphyton, and macroinvertebrate communities was studied. Resultsshowed spatial differences on G. bogotensis habitat occupation and differences incaptures at each depth, which depend on the dominant type of aquatic vegetationand size of individual. We conclude that only cylindrical cloth traps are suitable toconduct population studies of G. bogotensi

Peces del piedemonte del departamento de Casanare, Colombia

Se presenta un listado de especies de peces para el área del piedemonte del departamento del Casanare, región de la Orinoquia en Colombia. El listado es resultado de colectas en campo realizadas entre 2006 y 2009 en 52 puntos de muestreo en los principales ríos de la región, revisión de material depositado en colecciones y revisión de literatura disponible. Se registran 168 especies pertenecientes a seis órdenes, 27 familias y 93 géneros. Del total de especies, nueve son nuevos registros para la cuenca del río Orinoco en Colombia. El río que presenta el mayor número de registros de especies es el Cusiana (115), seguido de los ríos Cravo Sur (96), Pauto (58), Túa (49), Upía (45), Casanare (15) y Guachiría (10)

A database of freshwater fish species of the Amazon Basin

The Amazon Basin is an unquestionable biodiversity hotspot, containing the highest freshwater biodiversity on earth and facing off a recent increase in anthropogenic threats. The current knowledge on the spatial distribution of the freshwater fish species is greatly deficient in this basin, preventing a comprehensive understanding of this hyper-diverse ecosystem as a whole. Filling this gap was the priority of a transnational collaborative project, i.e. the AmazonFish project - https://www.amazon-fish.com/. Relying on the outputs of this project, we provide the most complete fish species distribution records covering the whole Amazon drainage. The database, including 2,406 validated freshwater native fish species, 232,936 georeferenced records, results from an extensive survey of species distribution including 590 different sources (e.g. published articles, grey literature, online biodiversity databases and scientific collections from museums and universities worldwide) and field expeditions conducted during the project. This database, delivered at both georeferenced localities (21,500 localities) and sub-drainages grains (144 units), represents a highly valuable source of information for further studies on freshwater fish biodiversity, biogeography and conservation

Especies de peces gymnotiformes (Gymnotiformes, Teleostei) de Colombia

Neotropical electric fishes (Teleostei, Gymnotiformes), also called American knifefishes, are an important component of the nocturnal ichthyological fauna in Middle and South America. As with many Neotropical fishes, the actual diversity of Gymnotiforms has only come to be appreciated in recent years. The present number of Gymnotiforms is much higher than was previously recognized, with 131 valid species currently reported in the literature and at least 39 additional and undescribed species are currently known in museum collections (Albert unpubl. obs.