Abstract
The Bluetongue virus appears to be restricted in Argentina to the northeastern area of the country. In the Neotropical region the main vector could be Culicoides insignis Lutz. This study was aimed to determine the population fluctuation of C. insignis in Posadas city and test the influence of climatic variables as determinants of the abundance of this species. The specimens were collected in Posadas city using CDC light traps from January to December 2013. The abundance of C. insignis in relation to environmental variables was analyzed using multivariate linear regression. A total of 2,952 specimens of C. insignis were collected representing 93.4% of the total Culicoides captured. The multivariate linear regression analyses show that the monthly mean relative humidity was the variable that best explained the population dynamics of C. insignis in the work area. The pathogen transmission is probably influenced by the abundance of the vector in this area. The population peaks observed are indicative of periods when there should be more control to prevent transmission of the disease. This is the first report of population fluctuation of C. insignis in northeastern Argentina
Highlights
The or delayed reactions that range from allergic dermatitis, climatic variables considered for the study were: mean papules, and pustules as a result of overinfection monthly temperature, mean minimum monthly caused by scratching, to more severe reactions such as temperature, mean maximum monthly temperature, eczema, desquamation, and scars with alterations in monthly accumulated rainfall, and monthly mean relative skin pigmentation
With a p-value On the other hand, Veggiani Aybar et al (2011) in lower than 0.05, this term was statistically significant with northwestern Argentina, found that the mean minimum a confidence interval of 95%. These results indicate that and maximum temperatures and levels of accumulated the most influent variable over the abundance of C. rainfall were the variables most strongly related to the insignis was the monthly mean relative humidity (y: abundance of Culicoides species, showing that C. -1769.03 + 28.61 x5; R2 adjusted= 0.32; P
With respect to the effects of the climatic variables study are in agreement with data presented by Silva et on the abundance of C. insignis, it was observed that al. (2010) for Brazilian Amazonia, where C. insignis was the monthly mean relative humidity was the only variable the most abundant species, with 93% of the total that explained the dynamics of the species population at Culicoides captured in their sampling using CDC traps
Summary
Nematodes and viruses (Wirth & Blanton, 1959; Borkent The abundance of C. insignis was considered as the & Spinelli, 2007). Species of Culicoides are recognized dependent variable and the monthly climatic variables as vectors of the Bluetongue Virus (BTV) In the Neotropical region Culicoides insignis mean monthly temperature, X2—mean minimum monthly
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