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Table 4 Sex ratio (Sr) evolution by time for P. erythrinus, and corresponding χ 2 test results

From: Distribution and biological features of the common pandora, Pagellus erythrinus (Linnaeus, 1758), in the southern Tyrrhenian Sea (Central Mediterranean)

Parameter

1994

1995

1996

1997

1998

1999

2000

2001

2002

2003

2004

2005

2006

2007

2008

Total

No. females

135

141

132

167

117

131

99

222

152

130

46

56

53

49

28

1658

No. males

25

18

42

28

14

6

40

47

76

86

14

23

18

21

4

462

Mean (Sr)

0.84

0.89

0.76

0.86

0.89

0.96

0.71

0.83

0.67

0.60

0.77

0.71

0.75

0.70

0.88

0.78

Variance (Sr)

0.03

0.03

0.03

0.03

0.03

0.02

0.04

0.02

0.03

0.03

0.05

0.05

0.05

0.05

0.06

0.01

χ 2 value

74.26

93.61

45.52

97.66

79.42

112.23

24.20

112.55

24.67

8.56

16.02

12.96

16.28

10.41

16.53

674.72

χ 2 significance

**

**

**

**

**

**

**

**

**

**

**

**

**

**

**

**

  1. ** Statistic significant χ 2 (at p < 0.01)