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: North America

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
19700.2710.2040.408
19710.2540.190.373
19720.2870.2150.421
19730.2740.2060.399
19740.2640.20.383
19750.260.1960.382
19760.3310.2350.581
19770.2580.1960.376
19780.2510.1930.369
19790.2620.2010.383
19800.2540.1960.358
19810.2250.1770.306
19820.2560.20.365
19830.2280.1810.31
19840.2450.1910.344
19850.2460.1920.354
19860.2310.1810.321
19870.2260.1790.316
19880.2510.1950.358
19890.2180.1750.293
19900.220.1760.29
19910.2040.1640.275
19920.2170.1740.29
19930.2240.1790.308
19940.240.190.331
19950.250.1960.359
19960.2460.1960.337
19970.2590.2030.37
19980.2640.1940.462
19990.2840.2210.409
20000.2820.2150.414
20010.260.2030.36
20020.2590.20.372
20030.2310.1840.311
20040.2450.1910.342
20050.2220.1770.295
20060.2210.1770.296
20070.2180.1740.287
20080.2210.1750.304
20090.230.180.322
20100.2460.1960.331
20110.2270.1810.308
20120.2270.1770.317
20130.2290.1770.313
20140.2210.170.308
20150.2350.1820.337
20160.2440.1870.34

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