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International Journal of Zoology
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International Journal of Zoology
/
2013
/
Article
/
Tab 2
/
Research Article
Colony Development and Density-Dependent Processes in Breeding Grey Herons
Table 2
Correlation coefficients between the date of starting breeding and the breeding duration, the nestling feeding duration, or the number of fledglings in each nest.
Colony
Year
Breeding duration
Nestling feeding duration
Number of fledglings
Renkoji
1996
Renkoji
1997
19
NS
16
NS
30
**
Renkoji
1998
24
***
24
NS
30
NS
Renkoji
1999
20
**
19
NS
37
NS
Renkoji
2000
Tama Zoo
2000
Tama Zoo
2001
15
NS
14
NS
19
**
Tama Zoo
2002
54
*
40
*
78
**
Tama Zoo
2003
79
***
74
NS
100
*
Tama Zoo
2004
78
***
76
NS
117
*
Tama Zoo
2005
111
***
94
NS
150
*
Tama Zoo
2006
102
***
89
**
180
**
Tama Zoo
2007
125
***
106
NS
170
***
Tama Zoo
2008
101
***
95
NS
143
**
Tama Zoo
2009
105
***
84
**
137
**
Tama Zoo
2010
117
***
110
NS
150
NS
Tama Zoo
2011
93
***
87
*
120
*
NS,
; *
; **
; ***
.