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Diurnal Variation In Behaviour Of Pink-Footed Geese (Anser Brachyrhynchus) During Spring Migration In Trøndelag, Norway
Publikation: Konferencebidrag › Konferenceabstrakt til konference › Forskning
- Magda Ewa Chudzińska, Danmark
- Jesper Madsen
- Jacob Nabe-Nielsen
During spring migration, Pink-footed Geese Anser brachyrhynchus stop in mid
Norway to refuel before their onward flight to the Svalbard breeding grounds. In mid
Norway, geese feed on pastures, stubble as well as newly sown grain fields. The aim
of the paper is to describe diurnal variations in the behaviour of geese and to
examine whether these variations are driven by digestibility of food geese feed on or
also by external factors such as distance to the roost, disturbance and flock size.
Based on diurnal flock scans of activity budgets (observations carried out between
05h00 and 22h00 hrs) in each habitat type, we fitted a model containing all predictors
we believe may influence geese behaviour. The number of feeding and alert geese
on fields displayed a strong diurnal trend, which varied among habitat types, frequent
and sporadic disturbance, but not flock size. On roost sites, geese also showed
diurnal variation in resting and alertness. The observed diurnal variation differed from
what has been found on the wintering grounds indicating that during spring, birds
increase their foraging intensity in order to meet energetic and nutritional demands in
a short time. Seasonal availability of habitats as well as density dependence due to a
rapidly growing population size may also shape diurnal variations in goose
behaviour.
This study, in combination with diurnal variation in habitat choice derived from a
combination of flock scanning and detailed GPS satellite telemetry, may give an
input for establishing detailed energy budgets for geese at studied stopover sites.
Norway to refuel before their onward flight to the Svalbard breeding grounds. In mid
Norway, geese feed on pastures, stubble as well as newly sown grain fields. The aim
of the paper is to describe diurnal variations in the behaviour of geese and to
examine whether these variations are driven by digestibility of food geese feed on or
also by external factors such as distance to the roost, disturbance and flock size.
Based on diurnal flock scans of activity budgets (observations carried out between
05h00 and 22h00 hrs) in each habitat type, we fitted a model containing all predictors
we believe may influence geese behaviour. The number of feeding and alert geese
on fields displayed a strong diurnal trend, which varied among habitat types, frequent
and sporadic disturbance, but not flock size. On roost sites, geese also showed
diurnal variation in resting and alertness. The observed diurnal variation differed from
what has been found on the wintering grounds indicating that during spring, birds
increase their foraging intensity in order to meet energetic and nutritional demands in
a short time. Seasonal availability of habitats as well as density dependence due to a
rapidly growing population size may also shape diurnal variations in goose
behaviour.
This study, in combination with diurnal variation in habitat choice derived from a
combination of flock scanning and detailed GPS satellite telemetry, may give an
input for establishing detailed energy budgets for geese at studied stopover sites.
| Originalsprog | Engelsk |
|---|---|
| Udgivelsesår | 21 apr. 2012 |
| Status | Udgivet - 21 apr. 2012 |
| Begivenhed | The 14th meeting of the Goose Specialist Group - Steinkjer, Norge Varighed: 17 apr. 2012 → 22 apr. 2012 |
Konference
| Konference | The 14th meeting of the Goose Specialist Group |
|---|---|
| Land | Norge |
| By | Steinkjer |
| Periode | 17/04/2012 → 22/04/2012 |
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