Naturalist's Worksite News

 

2022 Preliminary Monarch Report - Annapolis Valley

2022 looks to be a very good year for Monarch breeding in the Annapolis Valley.  The following information is for just the Common milkweed field (2 ha) in Brooklyn Corner, N.S. Other people in the Annapolis Valley are also seeing good succcess in the number of Monarchs.
As of 18 September the inventory in our field is;

  • ~ 40 Monarch butterflies in the field
  • > 45 Chrysalis marked with flags in the field
  • ~ 230 Monarch released from captive breeding

Timeline:

  • 21 May - The first Monarch visits and stays through June
  • 10 June - First Monarch egg found
  • 13 June - First Larva found
  • 4 July - The main migration north arrives and population increases dramatically
  • 11 July - First eclosure and release of a Monarch Butterfly
  • 4 September - last egg found 

Below is the count of Monarch butterflies seen in our field of milkweed. We have also noted the number of coupled pairs in the count for that day. Counts are only done every two or three days.

Click on the chart for a larger version

Before mowing areas around the field we survey for eggs and larva then protect and feed them until they eclose as butterflies. These we tag along with wild Monarchs. The chart below shows the time line of releases. It is estimated from surveys of marked chrysalis that in September we were getting over 10 eclosures per day in the field so the productivity was very good this year. 

Click on the chart for a larger image.

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