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Phenology results

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Results

Using the map layer below, we are able to see the local observations of Sandhill cranes in around Laramie, WY.  By clicking on each of these points we are also able to compile spring and fall data (see below) for specific dates of the observations.

From here we can ask many questions:

Do we see any patterns in the data?

Are there any shifts in migration timing?

Are the observations spatially distributed in any specific way?

Remember I wanted to test the hypothesis if there were constant observations of Sandhill cranes, indicating a migration route in the spring and fall.  

What I find is that between 1985 and 2012 we see that in the spring the observations of Sandhiil cranes were between early April to late June.  And although there is not much data from the 90's I do see observations distributed through time to indicate a well used migration path through the Laramie area. 

Similarly, in the fall between 1989 and 2004 these cranes have been observed between early August and mid October, with the strongest likelihood being mid to late September. 

From my analysis I am able to conclude that in any given year I maybe able to see Sandhill cranes either in the spring (around April-June) or fall (September and into October). Because of this wide range of observations I am unable to reject my null hypothesis and brings up other questions.  Is there a breeding pair in the area? What was the weather like on the years of very early or very late migration? 

Spring Fall
4/03/85 8/9/89
4//11/12 9/6/88
4/15/85 9/6/89
4/16/01 9/6/90
4/18/12 9/19/04
4/24/12 9/20/93
5/17/90 9/20/03
5/25/08 9/21/02
5/26/04 9/22/07
6/19/12 10/10/08
6/23/08  
6/29/04  

 

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