Bird migration and satellite tagging Andrew Pierce Philip Round Chukiat Nualsri & Kaset Sutasha
What is migration?
• Seasonal movements between breeding and non-breeding
grounds
• Mostly from high northern latitudes to tropical or more
southerly latitudes
• Also can be from high altitudes to lower ones
• Not the same as dispersal
Why do birds migrate?
• Evolved after last ice age
• To exploit food resources
• Vast tracks of land for nesting
• Longer day length – larger clutches
Why is it important to study migration
• Every year billions of birds migrate
• 2000 species (20 %) regular seasonal movements
• 40 % of migratory birds declining
• 200 species considered endangered
• In order to conserve birds we have to conserve their habitats in all countries along their flyways
Liming
5.7 million per year in Egypt alone
Hunting & trapping 10s of millions
per year in Europe & North Africa
Ringing studies
Individual numbered rings
Need to ring large numbers
Need to recover dead or alive
Barn Swallow
Geolocators
Light-weight 0.5 g
Need to retrap the bird
Use daylength for location
Less accurate near equator
Studies in Thailand
• Waders – canon-netting and geolocators
• Passerines – mist-netting
• Raptors – counting & ringing
Laem Phak Bia
Occasional “falls “of migrants
150 Dusky Warblers ringed in two days, April 2004
54 Siberian Blue Robins on 1-2 October 2006
Large-billed Reed Warbler, 27 March 2006: 2nd record for The World
Eurasian Curlew
Broadbill Sandpiper
Common Redshank tagged in Singapore Tagged in Thailand and re-sighted in Singapore
Development of Khao Dinso
• Basic counts – on to systematic counts
• Flyway foundation and local participation
• Bird-ringing
• Satellite tracking
Ringing at Khao Dinso
Japanese Sparrowhawk 294
Chinese Sparrowhawk 97
Shikra 7
Useful biometric & moult data
Ratios of male/female/juveniles
But no retraps
No data on Spring migration
Objectives
• Determine the main routes
• Determine any stopover sites
• Speed of travel (distance per day)
• Wintering areas
• Breeding Grounds
Satellite tags
• Platform Transmitting Terminal PTT
• Various tags available
• Gps tags
• Solar-powered 5-g tags
Satellite tagging
• Testing & calibration
• Get disorientated after long movements
• Make sure data gives correct location
How the tags work
• 10 hours ON – 48 hours OFF
• Solar-powered
• Doppler effect
• GPS tags (need larger birds)
Catching the bird
Birds migrate over the ridge at KD
Nets set perpendicular to flight path
Birds fly low between trees when windy
Medan
SandakanBSBCC
To Wallace’s Standardwing
Apasara
6 Oct
23 days
2947 km
Chom
29 Sep
Chom
13 Oct
16 days
1582 km
Apasara
13 Sep
Japanese Sparrowhawk Accipiter gularis
Medan
SandakanBSBCC
To Wallace’s Standardwing
Apasara
6 Oct
23 days
2947 km
Chom
29 Sep
Chom
13 Oct
16 days
1582 km
Apasara
13 Sep
Japanese Sparrowhawk Accipiter gularis
500 km
Erin
12 Dec
64 days
4046 km
Dara
20 Oct
8 Days
937 km
SandakanBSBCC
To Wallace’s Standardwing
Chinese SparrowhawkAccipiter soloensis
Erin 6 OctDara 2 Oct
3 weeks
500 km
Erin
12 Dec
64 days
4046 km
Dara
20 Oct
8 Days
937 km
SandakanBSBCC
To Wallace’s Standardwing
Chinese SparrowhawkAccipiter soloensis
Erin 6 OctDara 2 Oct
3 weeks
The Philippines
Sumatra
Java
Burma
China
Dara 30 Mar
Funded by:
1,000 km
Apasara
44 days
4401 km
Erin 15 Apr
60 days
6627 km
Erin 2 Mar
Apasara 26 Mar
Dara 16 May
39 days
3598 km
Northward
routes?
The Philippines
Sumatra
Java
Burma
China
Dara 30 Mar
Funded by:
1,000 km
Apasara
44 days
4401 km
Erin 15 Apr
60 days
6627 km
Erin 2 Mar
Apasara 26 Mar
Dara 16 May
39 days
3598 km
Northward
routes?
Stopover sites
• Very few
• Longest by Erin
– Sumatra 3 weeks outbound
– Java 10 days heading home
• Northern Thailand few days…
What next?
• More detailed analysis of habitat used
• More tags
– This is just a snap shot
– Need more tags to form better picture
Other species – if we can catch them…