Graph

Black-crowned Night-Heron
(Nycticorax nycticorax)

Breeding Bird Survey (BBS) - Canadian analysis

Additional information on: Breeding Bird Survey (BBS) - Canadian analysis

Geographic area or population: Lower Great Lakes / St. Lawrence Plain

Graph showing the trend of the species through out the observed years
 
Listing of the individual data points that make up the graph
YearAnnual IndexLower limitUpper limit
19700.0840.030.204
19710.0840.030.204
19720.0990.0410.262
19730.1050.0470.311
19740.1150.0520.395
19750.1030.0480.295
19760.0950.0430.25
19770.1070.050.369
19780.1090.0540.329
19790.0960.0420.27
19800.0920.0420.226
19810.0840.0340.192
19820.0960.0440.286
19830.0860.040.208
19840.0860.0380.22
19850.0830.0360.19
19860.0780.0320.176
19870.0740.0280.158
19880.0780.030.18
19890.0790.0330.189
19900.0910.0460.328
19910.0770.0310.187
19920.0830.0380.217
19930.0770.0320.188
19940.0790.0360.199
19950.0730.0290.171
19960.0670.0260.141
19970.0770.0320.192
19980.0730.0310.167
19990.0670.0260.146
20000.0670.0250.151
20010.0960.0480.416
20020.0630.0220.14
20030.0680.0270.161
20040.0730.0320.183
20050.0890.0440.283
20060.0690.0290.166
20070.0830.040.251
20080.0660.0260.157
20090.0610.0220.146
20100.0710.0310.189
20110.0630.0230.164
20120.070.0290.18
20130.0690.0290.191
20140.0680.0260.213
20150.0850.0370.297
20160.0690.0280.202

Notes on numeric data: Ex represents 10 to the power of x; For example 1.2345E-2 is equivalent to 0.012345