Orientation in relation to exposure to the setting sun in some passerine trans-saharan migrants

Marchetti, Chiara; E, Bezzi; Baldaccini, Natale Emilio

doi:10.1080/08927014.1998.9522863

Cited by 8 publications

(2 citation statements)

References 36 publications

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“…Attraction towards the sun's position during experimentation at sunset has been observed for a number of passerine migrants in circular cage experiments (e.g. Åkesson 1993, 1994, Åkesson & Sandberg 1994, Åkesson & Bäckman 1999, Sand-berg et al 1991, Marchetti et al 1998. It has been suggested that information available at the horizon is important for the bird's compass orientation during the twilight period (Sandberg 1991, see also Muheim et al 2006), and free-flying North American Catharus thrushes seem to use twilight visual information for compass calibration prior to nocturnal flights (Cochran et al 2004).…”

Section: Orientation Under Natural Clear Skiesmentioning

confidence: 96%

Effects of magnetic manipulations on orientation: comparing diurnal and nocturnal passerine migrants on Capri, Italy in autumn

Åkesson

Jonzén

Pettersson³

et al. 2006

Ornis Svec

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Orientation cage experiments were performed on Capri in Italy, with a diurnal passerine migrant (Tree Pipit Anthus trivialis), and a nocturnal passerine migrant (Garden Warbler Sylvia borin), to study the use of magnetic compass information during autumn passage migration. The experiments were performed outdoors at sunset in: (1) the local geomagnetic field under natural clear skies, (2) a shifted magnetic field (mN −90°) under clear skies, and (3) a shifted magnetic field (mN −90°) under simulated overcast skies. Day migrating Tree Pipits showed a clear shift in orientation compared to controls (i.e. local geomagnetic field and clear sky conditions) corresponding roughly with the magnetic shift (mN −90°) under clear as well as overcast skies, while the Garden Warbler migrating at night, did not respond to the same magnetic manipulations by shifting their preferred directions in the cages. The mean orientation of Tree Pipits did not differ from the sun’s position during experiments, while it was clearly different in Garden Warblers. Species-specific orientation responses to experimental manipulations in caged compared to freeflying migrants is discussed.

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Section: Orientation Under Natural Clear Skiesmentioning

confidence: 96%

Effects of magnetic manipulations on orientation: comparing diurnal and nocturnal passerine migrants on Capri, Italy in autumn

Åkesson

Jonzén

Pettersson³

et al. 2006

Ornis Svec

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“…As a sixth category, only a few outdoor orientation cage experiments have been analysed in relation to weather so far, and these have concentrated mainly on the level of cloud cover (e.g. Mouritsen 1998a;Marchetti et al 1998;Å kesson and Bäckman 1999;Marchetti and Baldaccini 2003). All the studies mentioned above showed correlations and/or dependencies between weather factors and migratory activity.…”

Section: Introductionmentioning

confidence: 96%

Weather significantly influences the migratory behaviour of night-migratory songbirds tested indoors in orientation cages

2010

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Each year, millions of birds migrate from their breeding grounds to their overwintering sites and back. The success, duration and effort of such a long journey depend strongly on the meteorological parameters the birds encounter en route. The behaviour of free-flying migratory birds and those studied outdoors in orientation cages has been shown to be influenced by local weather factors. However, only a few, mostly descriptive, studies have analysed whether meteorological parameters should be considered when testing captive migratory birds indoors in orientation cages. Here, we used a statistical approach to analyse how meteorological parameters affect orientation performance in a night-migrating songbird, the garden warbler (Sylvia borin), when tested indoors in Emlen funnels. Our results show that the activity and directionality of the tested birds is influenced significantly by local atmospheric pressure. Together with previous studies, these results suggest that weather conditions have an impact on orientation behaviour even during indoor experiments. The findings emphasize the importance of mixing up and/or randomizing different conditions on any given night. Ideally, during any given test night, the same number of birds should be tested in each condition involved in a given study. Thereby, the documented weather effects will influence the results of all experimental groups equally.

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Individual Variability in Experiments with Emlen Funnels

Marchetti

Baldaccini

2003

Avian Migration

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Orientation in relation to exposure to the setting sun in some passerine trans-saharan migrants

Cited by 8 publications

References 36 publications

Effects of magnetic manipulations on orientation: comparing diurnal and nocturnal passerine migrants on Capri, Italy in autumn

Effects of magnetic manipulations on orientation: comparing diurnal and nocturnal passerine migrants on Capri, Italy in autumn

Weather significantly influences the migratory behaviour of night-migratory songbirds tested indoors in orientation cages

Individual Variability in Experiments with Emlen Funnels

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