84 



SELECTION IN CLADOCERA ON THE BASIS OF 



LINE 740. 



Line 740 was the first line of S. exspinosus subjected to selection. 

 It was obtained in August 1912, from Pond IV, in which S. exspinosus 

 occurs the year round. Selection was begun at once and continued 

 for 181 and 184 generations, for a period of more than 56 months, 



TABLE 39. Selection summary for Line 740. 



Time period. 



Aug. 27, 1912- 



July 31, 1913 

 Aug. I, 1913- 



July 31. 1914 

 Test series, 



Apr. 1914. .. 

 Mar. 1914- 



May 1914... 

 Aug. 1, 1914- 



July 31. 1915 

 Aug. 1. 1915- 



July 31, 1916 

 Test series, 



Mar. 1916.. 

 Feb. 1916- 



Apr. 1916... 

 Test series, 



June 1916... 

 Mav 1916- 



Jufy 31, 1916 

 Aug. 1, 1916- 



May 1, 1917 

 Test series, 



Apr. 1917... 

 Mar. 1917- 



May 1, 1917 



Strain. 



Plus... 

 Minus 

 Plus. .. 

 Minus 

 Plus... 

 Minus 

 Plus. .. 

 Minus. 

 Plus... 

 Minus 

 Plus. .. 

 Minus 

 Plus. .. 

 Minus 

 Plus... 

 JMrnua 

 Plus... 

 Minus 

 Plus. .. 

 jtftnus 

 Plus... 

 Minus . 

 Plus... 

 Minus . 

 Plus. .. 

 Minus . 



139-146 

 140-147 



147-153 



148-154 



154-181 



55-184 



179 



181 



175-181 

 178-184 



1-34 



1-S4 



35-76 



35-79 



65 



66 



61-68 

 62-71 

 77-1 U 

 79-119 

 119-153 

 180-16635 15.3 



1423431.7 1078 

 143 34 32.0 1089 



8 17.9 

 8 17.6 



151 32 38.5 1231 



40.1 

 14.3 

 6 18.5 

 

 18.6 

 29.1 

 8619.1 

 6 12.7 

 3.6 



8*8 



fie 



848 



884 



884 



735.2 

 757.0 

 597.1 

 656.9 

 666.4 

 711.9 

 569.2 

 696. S 

 642.5 

 607.7 

 574.6 

 600.0 

 641.6 

 577.9 

 653.8 

 641. 8 

 420.2 

 525.7 

 574.7 

 710.4 

 311.1 

 395. 8 

 314.5 

 329. 8 

 262.0 

 165.7 



44-7 

 298.7 

 302.4 

 294.6 

 S78.3 



307.6 

 300.0 

 335.6 

 326. 9 

 324.6 

 331.7 



468.6 



243.0 

 334.0 

 256.3 

 267.0 

 248.8 

 184.6 



8.7 

 8.7 



7.8 

 7.6 



9.8 

 9.7 

 10.4 

 9.7 

 6.7 



6.3 

 6.5 

 19.2 



-46. 



-7.1 

 +34.8 



-25.4 

 +63.7 



-135. 7 

 -84.7 



-16.3 

 +96.3 



14-2 

 9.5 



21.1 



4-4S 

 4.17 



1.79 

 6.71 



10.3 10. 4 



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



Time period. 



Aug. 1, 



July 31 

 Aug. 1. 



July 31 

 Aug. 1. 



July 31 

 Aug. 1, 



July 31 

 Aug. 1, 



Slay 1 



1912- 

 , 1913 

 1913- 

 , 1914 

 1914- 

 , 1915 

 1915- 

 , 1916 

 1916- 

 , 1917 



Plus. ... 

 JWtnu*.. 

 Plus.... 

 Minus . . 



Plus 



Minus.. 



Plus 



Minus . . 

 Plus.... 

 Minus . . 



6 10.0 



312 



14 16 



410.6 



M 







us 



37 

 SO 

 216 

 22>i 

 42 

 41 



fi.32 

 834 

 815 



+31 



-S5 

 + 19 



+ 137 



SI .63 3.80 

 34.034.02 



