May Phenology 2: Insect First Appearances

by Carl Strang

Today’s seasonal comparison is between first appearance dates of insects at Mayslake Forest Preserve, through May. This includes April data, as there were not enough species in that month to consider alone.  As was the case with plants, the most dramatic difference was between this year and last: 15 species appeared a median 33 days later in 2013 than in 2012.

The differences from other years were smaller: 10 days later in 2013 than 2011 (15 species), likewise 10 days later than 2010 (13 species), and 5 days later than 2009 (12 species).

The bee fly Bombylius major first appeared 10 days later in 2013 than in 2010.

The bee fly Bombylius major first appeared 10 days later in 2013 than in 2010.

Green darners are our earliest dragonflies each year. In 2013 the first showed up 5 days later than in 2009.

Green darners are our earliest dragonflies each year. In 2013 the first showed up 5 days later than in 2009.

The numbers did not fully parallel those for flowering dates, in part because the months were combined, and in part because the sample sizes were smaller. Nevertheless, the 2013-2012 comparison is the consistent one. Also, this year is confirmed as the latest of the five I have been at Mayslake.

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: