Ecological Determinants of Forest to the Abundance ofLutzomyia longiflocosain Tello, Colombia

Abstract

Lutzomyia longiflocosa is considered the most likely vector of cutaneous leishmaniasis in the sub-Andean region of the upper valley of the Magdalena River between 1,000 and 2,000 meters in the Department of Huila, Colombia. L. longiflocosa is anthropophilic, has endophagic behavior, and is especially important since its dominance in epidemics recorded in the last decade in the departments of Huila, Tolima, and the outbreak in Norte de Santander. The aim of our work is to identify ecological determinants in forest microhabitat level defining the abundance of L. longiflocosa. We use sampling; this was performed in 56 microhabitats of 28 forests with CDC traps for two consecutive nights from 18:00 to 06:00 hours. Each microhabitat (favorable and unfavorable) was located 10 m from the ecotone, with an approximate area of 10 m 2 . Thirty-five variables were examined as potential explanatory variables which were recorded in each microhabitat. Regression models were used to identify ecological determinants. Our results confirm that there are favorable microhabitats in the forest with specific ecological determinants that define the aggregated distribution of the species and provide the conditions necessary for survival and abundance of L. longiflocosa.

Structure of the phytoplanktonic community in a neotropical Dam with environmental tension

“…Staurastrum is usually from oligotrophic environments with low pH, however, it can be registered in eutrophic systems; no nutrient influenced the dynamics of the temporal densities of Staurastrum, on the contrary, it is believed that they generate ecological strategies with other species of the same genus for the dynamics of population growth [33], and other taxonomic species such as an insects [34]. As for the other genera that have peaks of abundance, it could only be observed that Melosira and Fragilaria decrease their abundance when the water temperature increases [35].…”

Analysis of the adoption of third party in the logistics operations of a sample of companies constituted in the city of Neiva

“…The main objective of the research is to determine the degree of adoption of outsourcing of logistics operations within the city of Neiva. A sample of 100 companies from different economic sectors is contemplated according to Table 2; to these companies an instrument is applied with the same objective of measuring the degree of outsourcing of the logistics processes, which is given an internal validation supported in a reliability analysis of cronbach coefficient [18], [19]. The 100 companies identified for the analysis, domiciled in the city of Neiva are part of the following productive sectors: transport, services, and industrial production, fish farming, oil & gas, financial, public sector, construction, trade, automotive and agroindustrial [20].…”

Ascaris spp antigens

“…Like other anaerobic parasites, Ascaris suum uses exogenous glucose for the energy generation through the glycolytic pathway [14], which incorporates external glucose and decomposes it with glycolytic enzymes such as maltose-glucoaminase, sucrase-isomaltase, fructose-bisphosphate-aldolase and fumarate-reductase. However, while they are potentially foreign substances for the host body, since they do not present any type of genomic homology or in their amino acid sequences with human molecules, the antigenic or allergenic value of any of the aforementioned enzymes has not been demonstrated [15]. On the other hand, enolases (hydrolases 2-phospho-D-glycerate) are essential glycolytic enzymes that catalyse the interconversion of 2-phosphoglycerate and phosphoenolpyruvate and they are excretion/secretion products of Ascaris [13].…”