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: Prairie Potholes

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
19700.1360.060.301
19710.1360.0630.3
19720.1430.0730.303
19730.1330.0640.285
19740.1560.0820.343
19750.1260.0620.258
19760.1650.0860.456
19770.1510.080.44
19780.1460.0790.398
19790.1230.0610.254
19800.1540.0840.394
19810.1320.0630.303
19820.1310.0710.326
19830.1180.060.251
19840.1110.050.231
19850.1160.0560.244
19860.1150.060.241
19870.1230.0640.259
19880.1180.0640.286
19890.1160.0620.23
19900.110.0560.214
19910.1310.0760.316
19920.1370.0810.391
19930.1010.0530.188
19940.1130.0660.248
19950.110.0550.211
19960.1020.0520.192
19970.0910.0440.177
19980.0850.0350.157
19990.110.0640.279
20000.0890.0430.164
20010.0940.050.184
20020.0860.040.169
20030.0810.0340.15
20040.0920.0470.195
20050.1420.0710.378
20060.0920.0480.199
20070.090.0420.174
20080.080.0360.155
20090.0860.0410.168
20100.0820.0360.161
20110.0950.0430.202
20120.0820.0390.178
20130.0880.0450.221
20140.0990.0510.254
20150.0860.0450.193
20160.0990.0510.24

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