Size of the overwintering monarch populations - published data.

Stanley A. Gorodenski stan_gorodenski at
Sun Oct 12 21:25:10 EDT 2003

Chip Taylor wrote:

> Watch Season Summary. Measurement of some of the monarch colonies 
> began in the late 70's but there was no attempt to travel to and 
> measure all of the colonies until the winter of 1995/96. Some of these 
> data were published previously in the

This is interesting. In a previous message I said regarding Paul's time 
"For example, if the large migratory population in the middle of Paul's 
time series is the result of researchers having learned how to best 
measure migration size during the beginning of the time period, then the 
more recent drop in numbers (although comparable to the magnitude level 
at the beginning of the series) would be something to be even more 
concerned about. "

So, I am wondering (as I speculated), is the drop as shown in recent 
numbers, which correspond in general magnitude to the counts at the 
beginning of the series, something to be even more concerned about?


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