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  • 1. Abundance and Seasonality of Insects and its relation with Birds in a Moist deciduous forest of Siruvani
  • 2. Objectives
    • to describe the Seasonal patterns in insect abundance,
    • to examine the role of various ecological factors in regulating the insect abundance
  • 3. Study area
    • Location
      • 76 o 41’ & 76 o 45’ E &
      • 10 o 56’ & 10 o 58’ N
    • Altitude
      • 513m from msl
    • Vegetation
      • Moist Deciduous
  • 4. Siruvani forest (Study site) Teak plantation Moist deciduous
  • 5. Annual Rainfall Pattern (Siruvani) Mean = 1926 mm Source: TWAD
  • 6. Methodology
    • Methods
    • Sweeping
    • Knock down
    • Light trap
    • Transect counting
    • Overall insect abundance
      • (Sweeping + Light trapping + Knock down)
  • 7. Insect abundance fluctuation recorded by different methods
  • 8. Insect abundance (method-wise)
  • 9. Seasonal abundance (method-wise)
  • 10. Species richness (method-wise)
  • 11. Relative abundance in different habitats
  • 12. Abundance of insect groups (habitat-wise)
    • MD Riverine TP Total
    • Coleoptera 287 454 269 1010
    • Lepidoptera 507 689 216 1412
    • Hemiptera 370 290 272 932
    • Diptera 1087 830 484 2401
    • Orthoptera 584 562 385 1531
    • Hymenoptera 551 461 421 1433
    • Others 376 334 276 986
    • Total 3762 3620 2323 9705
  • 13. Pattern of abundance fluctuation in different habitats
  • 14. Species richness
  • 15. Composition of Insect Community
  • 16. Seasonal abundance of Insects
  • 17. Seasonal abundance of insect groups
    • N-E M. Winter Summer S-W M Total
    • Orthoptera 20.6% 35.4% 15.2% 28.9% 100%
    • Lepidoptera 17.4% 38.2% 8.4% 36.0% 100%
    • Hemiptera 18.8% 28.5% 21.6% 31.2% 100%
    • Diptera 26.2% 14.7% 8.6% 50.5% 100%
    • Hymenoptera 23.5% 27.3% 19.7% 29.5% 100%
    • Coleoptera 19.7% 12.3% 24.2% 43.8% 100%
  • 18. Abundance fluctuation in Diptera
  • 19.
    • Order Factors affecting abundance
    • Coleoptera Rainfall (+ve) & Flowers (-ve)
    • Diptera Temperature (-ve)
    • Hemiptera -
    • Hymenoptera -
    • Lepidoptera -
    • Orthoptera Bird abundance (+ve)
    Factors affecting insect abundance (Step-wise Regression)
    • = Seasonal fluctuation Significant
    • = Seasonal fluctuation insignificant
  • 20. Temporal fluctuation in Rainfall & Insect abundance
  • 21. Abundance of Birds & Insects R = -0.601 (P = 0.02) R = 0.438 (P = 0.03) Coleoptera (-ve) Orthoptera +ve Lepidoptera Hemiptera Hymenoptera Diptera
  • 22. Conclusions
    • Abundance
      • SW Monsoon > Summer > Winter > NE Monsoon
      • Moist deciduous > Riverine > Teak plantation
    • Role of Environmental factors
      • Overall Insect abundance - Temperature (-ve)
      • Coleoptera - Rainfall & Number of rainy days
      • Diptera - Humidity & Number of rainy days
      • Orthoptera - Bird abundance (-ve)
      • Hemiptera
      • Hymenoptera
      • Lepidoptera
    Seasonal fluctuation NS,
  • 23. Composition of Butterfly fauna