BANK SWALLOW

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Bank Swallow
Copyright © 2005 Eric Secker

 Conservation Concern: NONE

Population Trend: Poorly Known
Credibility: Poor

The Bank Swallow is an uncommon breeder in the CW Region.  Bank Swallows usually nest in banks or cliffs - frequently near water.  These areas are poorly sampled by the BCN Census.  Conclusions regarding this species population trend cannot be drawn from the limited amount of data that has been collected

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*:		  
  -31%   -8%  
   
   

 

 

Technical Notes (1997-2004 Trend)

Sample Size (Indiv.): 22

Sample Size (Records): 9

 

AVG. YEARLY RATE OF CHANGE:
(including standard error)
-147 to 85

  GOODNESS OF FIT:
Chi-square: 7.82, df 2, p 0.02
Likelihood Ratio: 10.15, df 2, p 0.0063
AIC: 6.15
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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