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Family movement of
GPS tracked geese
Andrea Kölzsch
Gerard Müskens, Peter Glazov, Helmut Kruckenberg,
Pratik Gupte, Kees Koffijberg, Bart Nolet,
Andrea Flack, Martin Wikeslki
Juvenile importance
• Juvenile performance
determines population
dynamics
– Vulnerability
– Dispersion
• Ontogeny of timing and
space use
– Individual learning
– Social learning
Extended parental care
• Intensity
• Duration
Duration of family cohesion
• Greater white-fronted geese
Goose families
• Young learn about
– feeding sites
– dangers
– social behaviour
– migration
• Subadults can help
defend the nest
• Large families dominant
at winter feeding
Goose winter dynamics
Spatial-temporal dynamics
• Larger families further west in 2nd half of winter
• Adults leave earlier in spring
Goose family catching
• 2014 – now:
13 families tagged with Dutch
Association of Goose Catchers
Goose family tracking
• Tag design for
juveniles and
better survival
– Growth
– Antennae
– Data download
– Life time tracks
Goose family winter movement
• Further
movement of
independent
juveniles,
especially males
Max daily distance
Goose family behaviour
• Less resting and more vigilant if with parents
%timeresting
%timevigilant
Without
parents
With
parents
Without
parents
With
parents
Goose family splits
• Mostly split just before
spring or during migration
• Disturbance
Day of split event
(day after 1 November)
Probabilityofsplit
Goose family reunion
Split 12 Feb 7:00
Rejoin 12 Feb 17:30
Goose family reunion
Goose family survival
• Juveniles without parents
quickly shot or predated in
spring
Day of split event
(day after 1 November)
Dayofdeath
(dayafter1November)
Still alive
Lost signal in summer
Goose family leadership
• Energy saving hypothesis
– V formation flight
– Use of uplift
– Leadership switching
• Communication hypothesis
– Constant angle to keep
together
– Social learning
Goose family migration
Parental leadership in spring
• Parents
lead
• 80% father
• 20%
mother
• Communic
ation
hypothesis
Leadership vs. wind support
• Father spends less energy if
leading
• Father usually leads with
strong tail winds
Conclusions
• Many juveniles stay with family all winter
• Differences in behaviour and movement if
with or without parents
• Reunion after splits possible
• Parents lead during migration
– Communication and learning
Outlook
• First juveniles with transmitters returned this
winter
– compare tracks
Thanks
• Ganzenflappers
• Goose observers & ringers

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