Monarchs and Monoculture in southern Michigan

Patrick Foley patfoley at csus.edu
Fri Aug 26 11:59:42 EDT 2005


Paul,

Do you understand the concept of sources and sinks?

Pulliam, H. R. 1996. Sources and sinks: empirical evidence and 
population consequences. pp. 45-69, In Population Dynamics in Ecological 
Space and Time. O. E. Rhodes, Jr. R. K. Chesser, and M.H. Smith, 
Editors. The University of Chicago Press, Chicago, Ill.

And as always, it is worth remembering that hundreds, if not thousands 
of much more vulnerable lepidoptera  live in the Midwest, almost none of 
them as weedy, opportunistic and vagile as Monarchs.

Patrick
patfoley at csus.edu

Paul Cherubini wrote:

>Ed wrote:
>
>  
>
>>1998     1999        2000      2001        2002      2003        2004
>>E - 44    E - 164    E - 37    E - 974    E - 87    E - 854    E - 70
>>A - 5     A - 34      A - 3     A - 84      A - 8      A - 131   A - 1
>>    
>>
>
>Ratio Midwest vs. Atlantic coast state tag recoveries:
>
>1998: 8.8 to 1
>1999: 4.8 to 1
>2000: 12.3 to 1
>2001  11.6 to 1
>2002  10.8 to 1
>2003    6.5 to 1
>2004  70.0 to 1
>
>Everyone can see at a glance there was no fundamental change
>in the Midwest vs. Atlantic coast state tag recovery ratios after
>2001 as compared to before 2001. 2001 was approx. the year
>when transgenic corn and soybeans.had become the dominant
>crops grown in the upper Midwest.
>
>Paul Cherubini
>El Dorado, Calif.
>
> 
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