thesis.pps

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thesis.pps

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

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