LIST OF TABLES. 



1. History of lines of Cladocera used in selection experiments 9 



2. Data from an early test series of Line 695 to illustrate differences in general 



reactiveness to light on successive days 18 



3. Summary of selection data by broods for Line 695 plus 29 



4. Summary of selection data by broods for Line 695 minus 32 



5. Selection data summarized by two-month periods for Line 695 plus 35 



6. Selection data summarized by two-month periods for Line 695 minus 36 



7. Selection summary for Line 695 37 



8. Same-day broods. Summary of data for Line 695 38 



9. Selection data summarized by two-month periods for Line 689 plus 46 



10. Selection data summarized by two-month periods for Line 689 minus 46 



11. Selection summary for Line 689 47 



12. Same-day broods. Summary of data for Line 689 47 



13. Selection summary for Line 691 49 



14. Same-day broods. Summary of data for Line 691 50 



15. Selection data summarized by two-month periods for Line 711 plus 51 



16. Selection data summarized by two-month periods for Line 711 minus 52 



17. Selection summary for Line 711 52 



18. Same-day broods. Summary of data for Line 711 52 



19. Selection summary for Line 713 54 



20. Same-day broods. Summary of data for Line 713 54 



21. Selection summary for Line 714 57 



22. Same-day broods. Summary of data for Line 714 57 



23. Selection data summarized by two-month periods for Line 719 plus 61 



24. Selection data summarized by two-month periods for Line 719 minus 61 



25. Selection summary for Line 719 62 



26. Same-day broods. Summary of data for Line 719 62 



27. Selection summary for Line 751 66 



28. Same-day broods. Summary of data for Line 751 66 



29. Selection summary for Line 762 68 



30. Selection summary for Line 766 70 



31. Selection summary for Line 768 71 



32. Same-day broods. Summary of data for Line 768 71 



33. Selection summary for Line 794 ' 74 



34. Same-day broods. Summary of data for Line 794 74 



35. Selection summary for Line 795 78 



36. Same-day broods. Summary of data for Line 795 78 



37. Selection summary for Line 796 81 



38. Same-day broods. Summary of data for Line 796 81 



39. Selection summary for Line 740 84 



40. Same-day broods. Summary of data for Line 740 84 



41. Summary of selection data by broods for Line 757 plus 91 



42. Summary of selection data by broods for Line 757 minus 94 



43. Selection data summarized by two-month periods for Line 757 plus 98 



44. Selection data summarized by two-month periods for Line 757 minus 99 



45. Selection summary for Line 757 



46. Same-day broods. Summary of data for Line 757. 100 



47. Summary of data for more reactive individuals of Line 757 107 



48. Comparison of reaction-time means for the plus strain of Line 757 (within which 



selection was effective) with corresponding means for the plus strains 

 for S. exspinosus lines in which selection was not effective (Line 740) 



and the shorter S. exspinosus lines. Lines 794, 795, and 796 ....... 119 



49. Comparison of reaction-time means for the minus strain of Line 757 (within which 



selection was effective) with corresponding means for the minus strains 

 for S. exspinosus lines in which selection was not effective (Line 740) 



and the shorter S. exspinosus lines. Lines 794, 795, and 796 121 



