Grebes2

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Presentation and photographs of the grebes of Lake Hodges, part of the San Dieguito River Preserve in San Diego County.

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Grebes2

  1. 1. <ul><li>Two Species: Western & Clark's </li></ul><ul><li>Cross-breeding </li></ul><ul><li>Mating rituals </li></ul><ul><li>Fighting </li></ul><ul><li>Nesting </li></ul><ul><li>Second Brood </li></ul><ul><li>Ferrying and feeding young </li></ul>Presentation and Photography by Robert Harrington <ul>The Grebes of Lake Hodges </ul>
  2. 2. A word about the photography All photos taken with a Nikon D300 digital SLR Lens: 200-400mm AF-S Nikkor f/4 IF-ED VR with 1.4x teleconverter* All photos were taken handheld with aid of Bushhawk shoulder mount* Many photos taken from the footbridge Others taken from Bernardo Bay and Piedras Pintadas Trails *Scenery photo taken with Nikkor 18-70mm f/3.5-4.5 AF-S Lens at 18mm
  3. 3. <ul>Clark's Grebe – Note white envelops eye Male and female look alike (but they can tell) </ul>
  4. 4. <ul>Western Grebe – Note black around eye </ul>
  5. 5. <ul>Western (l) and Clark's (r) Grebes </ul>
  6. 6. <ul>Mating Rituals Clark's Grebes (and Western, I assume) mate for life They renew their bonds by food exchange and two types of rituals: The Rushing Ceremony, and The Weed Ceremony </ul>
  7. 7. <ul>Food exchange </ul>
  8. 8. <ul>The Rushing Ceremony </ul>
  9. 9. <ul>Rushing Ceremony - finish </ul>
  10. 10. <ul>Rushing Ceremony – miscue </ul>
  11. 11. <ul>In flight - almost </ul>
  12. 12. <ul>The Weed Ceremony where they pick up and hold weeds (Clark's) – Jan 12, 2010 </ul>
  13. 13. <ul>The Weed Ceremony – Western Grebes March 2, 2011 </ul>
  14. 14. <ul>Nesting – Nests are built on small islands </ul>
  15. 15. <ul>Ferrying and Feeding Young Young ride on the backs of both parents As many as four at a time Parents catch fish to feed young Sometimes fish are too large for young to swallow Young grow to full size in a few weeks They continue to beg even when full grown </ul>
  16. 16. <ul>Ferrying young </ul>
  17. 17. <ul>Ferrying young </ul>
  18. 18. <ul>Getting dumped </ul>
  19. 19. <ul>Both parents ferry young </ul>
  20. 20. Babies on back
  21. 21. <ul>Feeding </ul>
  22. 22. <ul>Feeding </ul>
  23. 23. <ul>Feeding young </ul>
  24. 24. <ul>Feeding young – hm, too big? </ul>
  25. 25. <ul>Feeding young – Clark's </ul>
  26. 26. <ul>Feeding young – even almost full grown </ul>
  27. 27. <ul>Feeding young and not-so-young </ul>
  28. 28. <ul>Cross breeding, Clark's and Western Grebes </ul>
  29. 29. <ul>Cross breeding, Clark's and Western Grebes </ul>
  30. 30. <ul>Clark's vs. Western Grebe Fight 7 slides </ul>
  31. 31. <ul>Grebe Fight – Clark's chasing </ul>
  32. 32. <ul>Grebe Fight - Face-off </ul>
  33. 33. <ul>Grebe Fight – Clark's lunges... </ul>
  34. 34. <ul>Grebe Fight – and misses </ul>
  35. 35. <ul>Grebe Fight – Chase resumes </ul>
  36. 36. <ul>Grebe Fight – Western turns </ul>
  37. 37. <ul>Grebe Fight – table turned </ul>
  38. 38. <ul>Second brood of 2011 – May 14, 2011 </ul>
  39. 39. <ul>The End </ul>

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