CANADA WARBLER

Canada Warbler
Copyright © 2005 Jerry Kumery

Conservation Concern: NONE

Population Trend: Decreasing
Credibility: Poor

The Canada Warbler is a probably very rare breeder in the CW Region. This species was never historically common in the Chicago area. Breeding birds are typically found in woodlands with moderate to dense understory and occasionally forest edges. This species is not adequately sampled by the BCN Census to produce an accurate trend. This species has only been recorded 21 times since 1988 and 6 times since 1997.

Trend Level

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Avg. Yearly
Rate of Change:

The vertical axis numbers represent an index of the population change.

Note that the scales may vary between graphs.

Avg. Yearly
Rate of Change*:

-48%

Technical Notes (1997-2004 Trend)

Sample Size (Indiv.): 3

Sample Size (Records): 3

AVG. YEARLY RATE OF CHANGE:
(including standard error)
-111 to 16

GOODNESS OF FIT:
Chi-square: 4.07, df 4, p 0.3971
Likelihood Ratio: 4.17, df 4, p 0.3829
AIC: -3.83
NOTE: (model fits if p values are above 0.05)

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1997-2004 Trend Point Count Data	1988-2004 Trend* All Observation Types