Ecological Archives A019-029-A4

Julie M. Garren and Sharon Y. Strauss. 2009. Population-level compensation by an invasive thistle thwarts biological control from seed predators. Ecological Applications 19:709–721.

Appendix D. Mean density of life history stages for seed augmentation treatments separated by pretreatment seed input range.

TABLE D1. Mean density of life history stages for seed augmentation treatments separated by pretreatment seed input range (+/- 1 SE). Average seedling densities from two 20 cm2 subplots within each 0.25 m2 plot. Adult and head densities are per 0.25 m2 plot. * significant treatment effect.

 

Seedlings

 

Adults

 

Heads


Control

 

 

 

 

 

low

27.1 (4.0)

 

3.4 (0.97)

 

42.6 (16.0)

mid

21.1 (2.66)

 

7.4  (1.81)

 

78.3 (23.46)

high

24.2 (2.96)

 

12.2 (2.97)

 

86.5 (23.39)


overall

24.1 (1.88)

 

7.65 (1.07)

 

69.1 (12.3)

 

 

 

 

 

 

           

1000 added

 

 

 

 

 

low

37.6 (4.99)

 

3.7 (0.71)

 

51.7 (17.01)

mid

36.3 (4.27)

 

11.0 (3.59)

 

103.3 (55.26)


overall

36.9 (3.20)*

 

7.35 (1.09)

 

77.5 (28.76)

 

 

 

 

 

 

           

3000 added

 

 

 

 

 

low

24.3 (5.03)

 

4.2 (0.96)

 

46.8 (12.80)

mid

31.5 (3.89)

 

10.0 (2.29)

 

107.5 (30.14)

high

23.1 (4.02)

 

8.9 (3.03)

 

61.6 (25.13)


overall

26.3 (2.57)

 

7.53 (1.07)

 

71.5 (13.8)

 

 

 

 

 

 


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