August Phenology

by Carl Strang

Comparison of August first flower dates and first appearances by insect species continued to show the same trends that have been consistent through the season at Mayslake Forest Preserve. The 26 plant species that I could compare among years bloomed a median of 3.5 days later than 2009 and 5.5 days later than 2010.

The first hairy aster flowers on August 24 were one day later than in 2009, 6 days later than in 2010.

As was the case in July, insect first appearances were earlier in 2010 than in 2009 (by a median 7 days), and later than in 2010 (median difference 12 days). The sample size was only 10 in each case, though.

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