Las Exuvias Pupales de Chironomidos Presentes en dos Tramos de la Quebrada La Vieja

Abstract

The chironomids are important family that respond to disturbances, becoming major groups to assess the degree of alteration which is subject to an aquatic ecosystem. In the Neotropics, the study of chironomids is reduced and documentation of the immense diversity of species is limited. For this situation, this research genre of Chironomidae (Diptera) based on the pupal exuviae and possible relationships with some physicochemical factors in the river gorge of the Old located in the eastern hills of Bogota studied at a minimum average height of 2690 meters, in a section in which two chosen were sufficiently remote areas. Two sampling for each zone with 3 replicates, in periods of high and low rainfall, with strategic location driftnets 3 0.30 m installed perpendicular to the channel of water for 15 minutes were performed. In total 319 were determined exuviae belonging to the 3 most common subfamilies in the Andes; Orthocladiinae with the highest abundance (57%), followed by Chironominae (29%) and Tanypodinae (14%). Temporary, especially it was found that the areas channeled during high precipitation (79%) and low (66%) had the highest abundance values represented by Cricotopus. The preserved area during the time of low rainfall (H = 1.948; Mg = 2.352) and high (H = 1.443; Mg = 2,003) had the highest values in the diversity indices, while the area channeled reported lower values during times of high rainfall (H = 0.7436; Mg = 1.114) and low (H = 1.17, Mg = 1.526). The most abundant in relation to physicochemical parameters (Orthocladius, Limnophyes and Cricotopus) genres presented in times of high rainfall, in this era various speed which is indicated as a key component.