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The Indian tropical tasar silk insect, Antheraea paphia Linn is distributed in different geographical locations and habitats in the torrid zone of this country. It is possibly because of the distinct ecological conditions prevailing in these different localities. The natural population of ecorace Korbi of tropical tasar silk insect is primarily Sal fed, bivoltine and wild, eurythermic, polyphagous and confers significant contribution in economy of aboriginals associated with collection and trading of natural cocoons available in Korba district of Chhattisgarh. The ecorace is naturally distributed on Shorea robusta Gaertn.F., Terminalia tomentosa W&A and Terminalia arjuna Bedd. The cocoons of ‘Korbi” having its association with tribe ‘Korwas’ of Chhattisgarh present an important source of their earnings. This race evinces morpho-metric variations in the quantitative traits of cocoons. The present study adjudicated on the cocoon structure and variations in the silk associated quantitative traits of natural population of males and females of ecorace Korbi collected from Korba forest, adducing variation in the quantitative traits of cocoons, multiple correlations between the different associates of both the sexes and regression function between the associates presented significant correlation. This race evinced morpho-metric variations in the quantitative traits of cocoons which provide a basis of natural selection. Altogether, 10 covariates out of 91combinations of multiple correlations surmised significant correlation in male population of ecorace Korbi of Antheraea paphia Linn. The female population of ecorace Korbi of A. paphia conferred a fairly good association in comparison to the covariates of the male. Altogether, 24 covariates out of 91 combinations elucidated significant association in female population. Regression function of 34 predictor variables and criterion variables was evaluated covering correlation coefficient, coefficient of determination, adjusted R Square, ‘t’ test for significance of correlation between the associates, Fisher’s ratio of regression (F) and regression function by the equation Y=a+bx adducing graphs of linear regression. The multiple correlations between the cocoon associates of male population of ecorace Korbi of tropical tasar silk insect A. paphia elucidated different magnitudes of positive and negative association among the different predictor and criterion variables. The female population of ecorace Korbi of A. paphia presented a different structure and functional relation between the associates of present investigation. Regression function between the predictor variables and criterion variables of 34 regression functions of both the sexes adjudicating magnitude and significance of correlation, magnitude of interdependence by coefficient of determination, adjusted coefficient of determination, ‘t’ test of significance between the associates, Fisher’s ratio of variance in regression function, standard error of estimate and prediction equation for all 34 combinations adjudicated different models for prediction with different magnitudes of correlation, coefficient of determination, adjusted coefficient of determination, regression variance, standard error of estimate and regression functions. The functional relation between the length and breadth of male cocoons being one of the combinations for covariates of 34 combination followed the regression function as Y=0.8284+0.4485X. The prediction function between the length and length-breadth ratio of male cocoons surmised the equation Y=1.0833+0.1107X to predict the length-breadth ratio of male cocoons. Likewise, the relation between length and volume of cocoons adduced significant increase with the increasing length of cocoons in the male population (R=0.9554**, DF=13, P < 0.01). R Square (R2=0.89380) predicted that 89.38 percent variation of increase or decrease in the volume of cocoons is controlled by length of cocoons and remaining 10.62 percent is controlled by other abiotic and biotic factors of the environment. The Fisher’ ratio of regression remained significant between the length and breadth of cocoons in the female population (F=9.5845**, DF=13, P < 0.01) and prediction line followed the equation of Y=1.2393+0.3737X. Regression functions between length of cocoons and length-breadth ratio of cocoons in female population runs upward together following the regression function Y=0.8908+0.1446X .
Antheraea paphia, ecorace Korbi, quantitative traits of cocoons, multiple correlations, regression function.
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