title
The Chincoteague Monarch Monitoring Project
1997 - 2006
Chincoteague National Wildlife Refuge
Assateague Island, Virginia

The study of the autumn migration of monarch butterflies at Chincoteague NWR is one of several monitoring projects being conducted in the Mid-Atlantic Region.  Dr. Lincoln P. Brower (project leader) is monitoring in the mountains near Sweet Briar College in Virginia; Richard K.Walton coordinates the monitoring project in Cape May, New Jersey; Denise Gibbs is monitoring on Assateague Island, Virginia. Assistants for the 2006 season at Chincoteague National Wildlife Refuge are Kate Tufts and Barbara Kreiley. This website will be updated weekly from late-September through mid-October each year. Data will include daily tallies as well as running seasonal totals for the road census.

Tagging Monarchs
Monarchs are netted and tagged using tags from Monarch Watch at the University of Kansas (see monarchwatch.org). Over the course of the project thus far, several monarchs tagged at CNWR have been recovered in southeastern states and at the winter sanctuaries in Mexico, specifically El Rosario and Sierra Chincua.

tagging in field  tagging  tagged monarch

Census Route and Habitats
The Chincoteague NWR Road Census is conducted three times per day from mid-September through mid-October. Counts are made by a single observer driving a car approximately 15-20 mi. per hour along a 5-mile route (Pollard Transect). All monarchs observed are tallied but no stops are allowed to count specific concentrations. The route passes through a variety of habitats including: salt marsh , wet meadow , tidal canals, mixed deciduous forest (mostly sweet gum and sassafras), maritime forest , bayberry/groundsel tree thicket , inter-dune areas , and primary dune and beach along the Atlantic Ocean.

Click to see  Route Map     Vicinity Map    View data for 1997 - 2005

2006 CHINCOTEAGUE  ROAD CENSUS: Daily & Seasonal Totals

Date
# Road Censuses 
(each takes 15 minutes)
Time 
of Observations 
          
Monarchs Perched
          
Monarchs in Flight
Total 
Monarchs
Hours of
Observation
Avg.  number 
Monarchs/Hour
of observation
9/17
 2
  1 pm, 4 pm
 1
 1
 2
 .5
 4
9/18
 3
 10 am, 1 pm, 4 pm
 0
 2
 2
 .75
 3
9/19
3
10 am, 1 pm, 4 pm
 1
 2
 3
.75
 4
9/20
3
10 am, 1 pm, 4 pm
 0
 9
 9
.75
 12
9/21
3
10 am, 1pm, 4 pm
 		1
 9
 10
.75
13
9/22
3
10 am, 1 pm, 4 pm
 5
 15
 20
.75
27
9/23
3
10 am, 1 pm, 4 pm
 1
 3
 4
.75
 5
9/24
3
10 am, 1 pm, 4 pm
 0
 12
 12
.75
 16
9/25
3
10 am, 1 pm, 4 pm
 30
 66
 96
.75
 128
9/26
3
10 am, 1 pm, 4 pm
 2
 65
 67
.75
 89
9/27
3
10 am, 1 pm, 4 pm
 1
 12
 13
.75
 17
9/28
3
10 am, 1 pm, 4 pm
 8
 1
 9
.75
 12
9/29
3
10 am, 1 pm, 4 pm
 249
 142
 391
.75
521
9/30
3
10 am, 1 pm, 4 pm
 45
 6
 51
.75
68
10/1
3
10 am, 1 pm, 4 pm
 20
 34
 54
.75
 72
10/2
3
10 am, 1 pm, 4 pm
 239
 379
 618
.75
 824
10/3
3
10 am, 1 pm, 4 pm
 33
 53
 86
.75
 115
10/4
3
10 am, 1 pm, 4 pm
 91
 14
 105
.75
 140
10/5
3
10 am, 1 pm, 4 pm
 4
 7
 11
.75
 15
10/6
3
10 am, 1 pm, 4 pm
 0
 0
 0
.75
 0
10/7
3
10 am, 1 pm, 4 pm
 2
 11
 13
.75
 26
10/8
3
10 am, 1 pm, 4 pm
 19
 38
 57
.75
 76
10/9
3
10 am, 1 pm, 4 pm
 16
 21
 37
.75
 49
10/10
3
10 am, 1 pm, 4 pm
 12
 32
 44
.75
 59
10/11
3
10 am, 1 pm, 4 pm
 0
 0
 0
.75
 0
10/12
3
10 am, 1 pm, 4 pm
 12
 35
 47
.75
 63
10/13
3
10 am, 1 pm, 4 pm
 5
 14
 19
.75
 25
10/14
2
10 am, 1 pm
 12
 0
 12
.25
 48
Season Total
 
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The following table compares cumulative weekly averages (monarchs observed per hour) between years.

 CHINCOTEAGUE NWR ROAD CENSUS 1997-2005

Week 
1997 
1998
1999
 2000 
 2001 
 2002
   2003  
  2004
 2005
 2006
3rd week of Sept.
 40
 0
 728*
3
34
49
**
2
 8
 10
4th week of Sept.
 61
  47  
162 
     72     
     62     
     14    
2
1
 26
 122
1st week of Oct.
 92
 86
     411    
13
276
11
246
 18
 143
 170
2nd week of Oct.
 47
 39
 89
197
275
   20  
39
 112
 327
 46
* based on three days sampled
** not sampled this year

The following table and chart compare cumulative season averages (monarchs observed per hour) between years.

CHINCOTEAGUE NWR ROAD CENSUS 1997-2005

1997
1998
1999
2000
2001
2002
2003
2004
 2005
 2006
60
44
243
71
162
25
96
 33
 174
 87


per hr by yr

All data © Denise R. Gibbs and Dr. Lincoln P. Brower. 

For further information on this effort contact:
Denise Gibbs
monarch301@verizon.net
or
Professor Lincoln P. Brower
Research Professor of Biology
Sweet Briar College
Sweet Briar, VA 24595
Telephone: 434-277-5065 or 434-277-5655  Fax: 434-381-6488

We thank the staff of Chincoteague National Wildlife Refuge for the opportunity to conduct this research. We invite you to join the Chincoteague National History Association and help promote a better understanding and appreciation of the Chincoteague National Wildlife Refuge.  Proceeds from memberships and sales of items are used to support and enhance interpretive programs and activities at the refuge.

 Chincoteague Natural History Association
P.O. Box 917
Chincoteague, VA 23336
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