Resumo

MARTINEZ-JAIME, Oscar Alejandro; DIAZ-GARCIA, José Antonio  e  SALAS-ARAIZA, Manuel Darío. Population growth curves of adults of Hippodamia convergens and Olla v-nigrum (Coleoptera: Coccinellidae). Rev. Colomb. Entomol. [online]. 2014, vol.40, n.2, pp.259-264. ISSN 0120-0488.

Population growth curves in two predator species in the region of Irapuato, Guanajuato, Mexico, were estimated using multivariate multiple regression techniques through third-degree polynomials functions defined by: Y₁(T,PP) = 1.058e+02 - 1.300e+01*T - 7.817e-01*PP + 4.058e-01*T² + 1.037e-02*PP² + 3.922e-02*T*PP - 5.360e-04*T*PP² Y₂(T,PP) = 1.246e+02 - 1.761e+01*T - 8.349e-01*PP + 6.359e-01*T² + 6.767e-02*PP² - 1.166e-02*T*PP - 2.865e-04*T*PP² where T is the average monthly standard temperature, PP is the average monthly accumulated rainfall and Y₁ and Y₂ are the numbers of Hippodamia convergens and Olla v-nigrum adults, respectively. The Roy criterion was used in the multivariate analysis of variance of the multivariate multiple regression, which statistical test value was 80.379 with a probability for its corresponding approximation F of 0.0001295, consequently, the estimated polynomials for the population growth curves were adequate. Multivariate association measures Wilks (ALH = 0.987978) and Roy (θ = 0.9877118) were calculated, allowing estimation of growth curves as prediction tools. These models of polynomial growth curves were compared to each other through the statistic W = 1978.3, which yielded a probability value P = 0**, concluding that the growth curves were different. The critical point for temperature and rainfall in both species coincided with the point (13.7 °C, 2.0 mm), in which the maximum numbers of individuals were obtained, resulting 3.4 to H. convergens and 2.2 for O. v-nigrum.

Palavras-chave : Multivariate multiple regression; Predators; Temperature; Precipitation.

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