TREE SWALLOW

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Tree Swallow
Copyright © 2005 Eric Secker

 Conservation Concern: NONE

Population Trend: Substantial Increase
 Credibility: Very Good

The Tree Swallow is a common breeder in the CW Region, less common to the south.  Breeding habitat includes cavities in trees (often near water) or in man-made structures such as bluebird boxes.  Short-term trends indicate that this species is increasing in our area.

Trend Level

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

*Data gathered using a assortment of sampling methods  - for casual inferences only
  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*:		  
  17%   1%  
   
   

 

 

Technical Notes (1997-2004 Trend)

Sample Size (Indiv.): 1141

Sample Size (Records): 330

 

AVG. YEARLY RATE OF CHANGE:
(including standard error)
7 to 27

  GOODNESS OF FIT:
Chi-square: 653.97, df 382, p 0
Likelihood Ratio: 667.93, df 382, p 0
AIC: -96.07
NOTE: (model fits if p values are above 0.05)

Download Table of All Observations

 
 

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Copyright © 2005 Audubon - Chicago Region & Bird Conservation Network

 
 
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