for Nocturnal Owl Monitoring in North America - Bird Studies Canada

beaverhillbirds.com

for Nocturnal Owl Monitoring in North America - Bird Studies Canada

GUIDELINES FOR NOCTURNAL OWL MONITORING IN NORTH AMERICA

GREAT GRAY OWL • GORDON COURT

table 1

PROTOCOL INFORMATION FOR LONG-TERM SURVEYS IN

MANITOBA, ONTARIO, ALBERTA, SASKATCHEWAN,

BRITISH COLUMBIA, NOVA SCOTIA, AND MONTANA

Region

Stations per

route

Station spacing/

time at station

Surveys per year/

timing

Broadcast protocol (minutes)

& playback species*

Manitoba 20 or more 0.8 km

3:40 min

1 visit

- late March/early April

1:00 listening

0:20 BOOW / 1:00 listening

0:20 GGOW / 1:00 listening

Ontario -

north

20 stations 1.6 km

3:40 min

(4:40 min in 1999)

2 visits (3 in 1999)

- early-mid March

- early-mid April

- late April/early May

2:00 listening (2:00 in 1999)

0:20 BOOW / 1:00 listening

0:20 GGOW / 1:00 listening

Ontario -

central

10 stations 2.0 km

13:00 min

(14:00 min in 1999)

2 visits (3 in 1999)

- early-mid March

- early-mid April

- late April/early May

1:00 listening (2:00 in 1999)

0:20 BOOW / 1:00 listening

0:20 BARR / 2:00 listening (x2)

0:20 BARR / 1:40 listening (x3)

Alberta

Foothills

10 stations 1.6 km

15:00 min

3 visits (4 in 1995)

- March 20 to May 5

2:00 listening

0:20 BARR / 1:00 listening (x6)

5:00 silent listening

Alberta 10 stations 1.6 km

8:00 min

(9:00 in 1999)

Saskatchewan non-standard 1.0 km or more

5:00 min

2 visits

- March 20 to April 10

- April 11 to May 2

April 1 to 10

April 30 to May 8

2:00 listening

0:20 BOOW/NSWO / 1:00 listening

0:20 GGOW/LEOW / 1:00 listening

0:20 BARR/GHOW / 3:00 listening

1:00 listening

BOOW/GGOW/BARR imitations or

other species in different habitats

British

Columbia

non-standard variable All species: Late

February to March

Flammulated/Pygmy

Owl: May to June

1:00 listening

1:00 Vocal imitation

1:00 listening

(repeated over 5 minutes)

Nova Scotia 10 stations 1.6 km

8:00 min

1 visit

- March 17 to May 7

2:00 listening

0:20 BOOW / 1:00 listening

0:20 BARR / 2:00 listening

0:20 BARR / 2:00 listening

Montana

Standard

routes,

different

lengths

0.25 mile (400 m)

3:00 min

All owl species:

February 15 to April 15

Flammulated Owl:

May 15 to June 15

3:00 listening

*OWLS:

BOOW - Boreal / BARR - Barred / GGOW - Great Gray / NSWO - Northern Saw-whet

GHOW - Great Horned / LEOW - Long-eared

6

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