Roosting habits and Post- breeding dispersal of juvenile Great Egrets in Ontario. D.V. Chip Weseloh & Dave Moore Canadian Wildlife Service - Ontario www.ec.gc.ca Harbor Herons and Waterbirds of Greater NY/NJ Harbor Working Group 12-13 January 2011 Staten Island, NY With field assistance by Linda McLaren, Tyler Hoar and Dave Andrews
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Roosting habits and Post-breeding dispersal of juvenile Great Egrets in Ontario. D.V. Chip Weseloh & Dave Moore Canadian Wildlife Service - Ontario .
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Roosting habits and Post-breeding dispersal of juvenile Great Egrets in
Ontario.D.V. Chip Weseloh & Dave Moore
Canadian Wildlife Service - Ontario
www.ec.gc.ca
Harbor Herons and Waterbirds of Greater NY/NJ Harbor Working Group
12-13 January 2011Staten Island, NY
With field assistance by Linda McLaren, Tyler Hoar and Dave Andrews
Objectives for 2010
• Confirm seasonal use pattern at major roost site.• Locate other roost sites, track numbers and usage.• Mark YOY egrets with highly visible wing-tags• Make greater efforts at re-sighting tagged egrets
SUMMARY1. Not used in spring, bimodal autumn peak #s2. 30 roost sites;NN= 8, 24 km; Roost size = 2-400+3. 118 egrets tagged at 3 sites 4. 39 individuals reobs., Egrets go to S. Ontario,
Michigan, Ohio and NY- Few birds went north.
LakeHuron
LakeErie
LakeOntarioChantry Island
Nottawasaga Island
Middle Sister Island
East Sister Island
Middle Island
Toronto Harbour
High Bluff Island
Locations of colonies & nest numbers – 2000sDickerson IslandBergin Island
Motor Island
Decade
Number of
Colonies
Number of Nests
(maximum)
1950s 1 1
1960s 2 10
1970s 4 63
1980s 4 108+
1990s 6 1782000s 11 359+
Barrier Island
Luther Marsh
Use of Luther Marsh roost site, by week, 2008-09
Opening day - duck hunting:27 Sep. 200826 Sep. 2009