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Figure 2 - Mean number of arthropods.trap"'.day" collected in areas of fruit cultivation and native vegetation during four seasonal periods in the Curu Valley, Ceara It was found that the Acari, Collembola and Formicidae groups had the highest percentage of individuals, and alternated in predominance in each system and during the four sampling periods (Table 2).

Figure 2 - Mean number of arthropods.trap"'.day" collected in areas of fruit cultivation and native vegetation during four seasonal periods in the Curu Valley, Ceara It was found that the Acari, Collembola and Formicidae groups had the highest percentage of individuals, and alternated in predominance in each system and during the four sampling periods (Table 2).

Related Figures (7)

Figure 1 - Mean values for temperature and total rainfall volume from June 2013 to May 2014 on the Curu Valley Experimental Farm, Ceara
Figure 1 - Mean values for temperature and total rainfall volume from June 2013 to May 2014 on the Curu Valley Experimental Farm, Ceara
Table 1 - Soil chemical characteristics, analysed for two periods at a depth of 0-15 cm in the areas of native vegetation (NV), and Cultivated with Mango (CM), Guava (CG) and Coconut (CC), in the Curu Valley region, Ceara
Table 1 - Soil chemical characteristics, analysed for two periods at a depth of 0-15 cm in the areas of native vegetation (NV), and Cultivated with Mango (CM), Guava (CG) and Coconut (CC), in the Curu Valley region, Ceara
Table 2 - Percentage of soil arthropods collected in the areas under study during four collection periods in the Curu Valley, Ceara during the rainy/dry period and Acari during the rainy period. Under native vegetation, the highest percentages were from the Collembola group during the rainy/dry and rainy periods, Formicidae and Hemiptera during the dry period and Formicidae during the dry/rainy period. The other groups were collected at a low relative frequency in all areas. During the seasonal collection periods, group richness was similar for each area (Figure 3). During the dry/rainy transition period, the area cultivated with coconut displayed the greatest group richness, while richness for the other areas was similar. During the dry period, group richness was the same in all areas. During the dry/rainy period, the greatest richness was seen in the areas of guava
Table 2 - Percentage of soil arthropods collected in the areas under study during four collection periods in the Curu Valley, Ceara during the rainy/dry period and Acari during the rainy period. Under native vegetation, the highest percentages were from the Collembola group during the rainy/dry and rainy periods, Formicidae and Hemiptera during the dry period and Formicidae during the dry/rainy period. The other groups were collected at a low relative frequency in all areas. During the seasonal collection periods, group richness was similar for each area (Figure 3). During the dry/rainy transition period, the area cultivated with coconut displayed the greatest group richness, while richness for the other areas was similar. During the dry period, group richness was the same in all areas. During the dry/rainy period, the greatest richness was seen in the areas of guava
Figure 3 - Richness of soil arthropods collected in areas of fruit cultivation and native vegetation during four seasonal periods in the Curu Valley, Ceara and coconut, and the lowest, in the area of mango. During the rainy period, the greatest richness was seen in the areas of native vegetation and mango cultivation, while the areas of guava and coconut displayed similar values.
Figure 3 - Richness of soil arthropods collected in areas of fruit cultivation and native vegetation during four seasonal periods in the Curu Valley, Ceara and coconut, and the lowest, in the area of mango. During the rainy period, the greatest richness was seen in the areas of native vegetation and mango cultivation, while the areas of guava and coconut displayed similar values.
Mean values by the same uppercase letter in a column do not differ by Student’s t-test; Mean values followed by the same lowercase letter on a line do not differ by Student’s t-test Table 3 - Values of the diversity index and evenness index for each area under evaluation and during the four collection periods, in the Curu Valley, Ceara
Mean values by the same uppercase letter in a column do not differ by Student’s t-test; Mean values followed by the same lowercase letter on a line do not differ by Student’s t-test Table 3 - Values of the diversity index and evenness index for each area under evaluation and during the four collection periods, in the Curu Valley, Ceara
*Significant correlations P <0.05; Others = Sum of arthropod groups collected in small quantities Table 4 - Correlations between the original variables (Arthropods and Indices) and the factors
*Significant correlations P <0.05; Others = Sum of arthropod groups collected in small quantities Table 4 - Correlations between the original variables (Arthropods and Indices) and the factors
Figure 4 - Correlation circle between the original variables (soil arthropods and indices) and the factors of the principal component analysis for the areas cultivated with fruit trees and native vegetation in the Curu Valley, Ceara. Coll = Collembla; Aca = Acari; Form = Formicidae; Hym = Hymenoptera; Ara = Araneae; He = Hemiptera; Dip = Diptera; Colle = Coleoptera; Orth = Orthoptera; Oth = Arthropods collected at a lower frequency; H’ = Shannon index; e = Pielou index; TOM = Total organic matter; Prec = Precipitation; Temp = Temperature; NV1 = Native vegetation (rainy/dry); CM1 = Cultivated with Mango (rainy/dry); CG1 = Cultivated with Guava (rainy/dry); CC1 = Cultivated with Coconut (rainy/dry); NV2 = Native vegetation (dry); CM2 = Mango (dry); CG2 = Guava (dry); CC2 = coconut (dry); NV3 = Native vegetation (dry/rainy); CM3 = Mango (dry/ rainy); CG3 = Guava (dry/rainy); CC3 = Coconut (dry/rainy); NV4 = Native vegetation (rainy); CM4 = Mango (rainy); CG4 = Guava (rainy) and CC4 = Coconut (rainy) and Hemiptera groups. The variables Collembola and Hymenoptera showed a good correlation with each other and with the principal components, which means that these organisms were collected in larger quantities in the CG4 and MN4 areas (rainy), and made similar contributions to forming the factors.
Figure 4 - Correlation circle between the original variables (soil arthropods and indices) and the factors of the principal component analysis for the areas cultivated with fruit trees and native vegetation in the Curu Valley, Ceara. Coll = Collembla; Aca = Acari; Form = Formicidae; Hym = Hymenoptera; Ara = Araneae; He = Hemiptera; Dip = Diptera; Colle = Coleoptera; Orth = Orthoptera; Oth = Arthropods collected at a lower frequency; H’ = Shannon index; e = Pielou index; TOM = Total organic matter; Prec = Precipitation; Temp = Temperature; NV1 = Native vegetation (rainy/dry); CM1 = Cultivated with Mango (rainy/dry); CG1 = Cultivated with Guava (rainy/dry); CC1 = Cultivated with Coconut (rainy/dry); NV2 = Native vegetation (dry); CM2 = Mango (dry); CG2 = Guava (dry); CC2 = coconut (dry); NV3 = Native vegetation (dry/rainy); CM3 = Mango (dry/ rainy); CG3 = Guava (dry/rainy); CC3 = Coconut (dry/rainy); NV4 = Native vegetation (rainy); CM4 = Mango (rainy); CG4 = Guava (rainy) and CC4 = Coconut (rainy) and Hemiptera groups. The variables Collembola and Hymenoptera showed a good correlation with each other and with the principal components, which means that these organisms were collected in larger quantities in the CG4 and MN4 areas (rainy), and made similar contributions to forming the factors.
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