Graph

Virginia Rail
(Rallus limicola)

Breeding Bird Survey (BBS) - Canadian analysis

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

Geographic area or population: Canada

Graph showing the trend of the species through out the observed years
 
Listing of the threshold values that appear on the graph
Population below lowest acceptable levelGoal
0.015 0.027
Listing of the individual data points that make up the graph
YearAnnual IndexLower limitUpper limit
19700.0140.0070.033
19710.0190.010.07
19720.0150.0080.034
19730.0150.0080.037
19740.0150.0080.033
19750.0140.0080.029
19760.0160.0090.038
19770.0160.0090.034
19780.0160.0090.037
19790.0150.0080.029
19800.0180.010.036
19810.0170.010.034
19820.020.0110.062
19830.0170.010.038
19840.0160.0090.03
19850.0160.0090.033
19860.0160.0090.033
19870.0160.0090.032
19880.0180.010.034
19890.0160.0090.031
19900.0180.0110.034
19910.0160.010.031
19920.0190.0110.037
19930.0180.0110.034
19940.020.0120.038
19950.0180.0110.033
19960.0240.0150.045
19970.0220.0140.043
19980.0230.0150.042
19990.0220.0130.041
20000.020.0120.036
20010.020.0120.041
20020.0180.010.033
20030.0280.0170.057
20040.0240.0150.053
20050.0240.0150.043
20060.0220.0130.039
20070.0220.0130.041
20080.0250.0150.044
20090.0260.0160.049
20100.0250.0160.043
20110.0330.0190.065
20120.0320.0170.068
20130.0210.0120.036
20140.0350.020.082
20150.0230.0140.038
20160.0250.0150.044

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