Efecto de los pesticidas sobre los procesos de descomposición de materia orgánica y en los descomponedores del género Nectopsyche

Pesticides are controlling substances that reduce, repel or mitigate pests that are harmful to crops. The insecticides are used in agricultural environments that end up reaching rivers, streams or lagoons by filtering underground bodies of water. Since insecticides are designed to control insect pests, they have the potential to damage aquatic invertebrates, which are mostly composed of arthropods and which play an important role in the structure and functioning of the aquatic ecosystem. The presence of these compounds in freshwater bodies affects aquatic fauna and can even reduce up to 42 percent of aquatic invertebrates. Therefore, this study pretends to evaluate the effect of pesticides on the decomposition processes of organic matter and decomposers of the Nectopsyche genus. For which this experimentation was developed by using concentrations of 0, 0.10, 5 and 10 ug L.1 of two insecticides; Engeo and Clorpirifós. The controlled study was carried out through the use of microcosms where the effect of both insecticides was evaluated. To estimate the alterations of these substances on the individuals of the genus Nectopsyche, the width of the head, weight and mortality of the shredders was measured. In addition, decomposition rates of organic matter were determined through the use of alder litter Alnus acuminata. The individuals studied showed changes in all the treatments carried out with both insecticides, as well as in the decomposition rates of organic matter. The presence of insecticides in the microcosms presented alterations in the development of individuals and in the decomposition rates of alder litter, however, there were no significant differences between the two substances.

• Glavni avtor: Carvajal Rebolledo, Constanza Andrea (author)
• Format: bachelorThesis
• Jezik: spa
• Izdano: 2018
• Teme: PESTICIDAS; PRODUCTOS QUÍMICOS AGRÍCOLAS; BIODEGRADACIÓN; MATERIA ORGÁNICA
• Online dostop: http://dspace.udla.edu.ec/handle/33000/10336