Table 3 Estimated coefficients of among-family (CVf) and within-family (CVwf) variation for DBH based on progeny data from four crossing designs—outcrosses (OUT), half-sib inbreeding (HSI), full-sib inbreeding (FSI) and selfing (SELF)—in two E. globulus field trials (Ridgley and Southport) at different ages (in years) from planting

From: The effects of age and environment on the expression of inbreeding depression in Eucalyptus globulus

Age

CVf (%)

CVwf (%)

 

OUT

HSI

FSI

SELF

OUT

HSI

FSI

SELF

Ridgley

        

 2

6.5***

6.9**

14.0***

18.2***

19.8

25.2

26.2

32.4

 4

5.6***

8.1***

11.8***

18.9***

13.6

18.9

20.4

24.5

 6

7.4***

8.6***

8.7***

15.5***

15.7

20.3

20.1

21.8

 10

9.3***

10.0***

9.6**

12.5***

19.2

23.2

25.3

25.4

 14

8.2***

9.9***

8.1ns

10.1**

20.1

25.4

27.3

27.3

Southport

 2

1.4ns

14.3**

9.1ns

24.9***

42.1

44.4

48.8

60.4

 4

0.0a

5.9ns

10.3*

19.6***

26.2

28.6

36.0

39.0

 6

0.0a

4.3ns

8.4ns

15.5***

24.0

28.7

34.9

33.8

 8

0.0a

4.9ns

2.5ns

14.3***

23.2

27.9

31.1

33.6

 14

0.0a

5.8ns

1.7ns

16.0***

21.9

24.1

29.0

31.8

  1. Variance estimate constrained to be non-negative at the boundary of zero.
  2. The CV values were calculated using the estimated least-squares means (LSM) for the corresponding cross types (as presented in Table 2).
  3. The significance probabilities given within parentheses refer to one-tailed likelihood ratio tests, used to test the departure of the estimated among-family variances from zero.
  4. Non-significant (ns), P>0.05.
  5. *P⩽0.05.
  6. **P⩽0.01.
  7. ***P⩽0.001.
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