Tag: all of Oenanthe

Optimal bird migration and predation risk: a field experiment with northern wheatears Oenanthe oenanthe

Northern Wheatear (Oenanthe oenanthe) Science Article 4 abstract Experiments testing predictions of optimal migration theory so far have concentrated on time and energy as the expenses that birds strive to minimize during migration. Taking advantage of the high variation in numbers of migrating raptors over the island of Helgoland, a field experiment with northern wheatears […]

Stopover behaviour and departure decision of northern wheatears,Oenanthe oenanthe, facing different onward non-stop flight distances

Northern Wheatear (Oenanthe oenanthe) Science Article 1 abstract On the small North Sea island Helgoland (54 deg 11??N, 07 deg 55??E) we studied the stopover ecology of two subspecies of northern wheatear, Oenanthe oenanthe, during spring migration. Birds heading for Scandinavia (O. o. oenanthe) face only short flights across an ecological barrier (50-500 km) whereas […]

Stopover behaviour and departure decision of northern wheatears,Oenanthe oenanthe, facing different onward non-stop flight distances

Northern Wheatear (Oenanthe oenanthe) Science Article 1 abstract On the small North Sea island Helgoland (54 deg 11??N, 07 deg 55??E) we studied the stopover ecology of two subspecies of northern wheatear, Oenanthe oenanthe, during spring migration. Birds heading for Scandinavia (O. o. oenanthe) face only short flights across an ecological barrier (50-500 km) whereas […]

Differential timing of spring migration in northern wheatears Oenanthe oenanthe: hurried males or weak females?

Northern Wheatear (Oenanthe oenanthe) Science Article 2 abstract In a field experiment on the island of Helgoland (southeast North Sea), we investigated whether migration strategy or competition between the sexes cause the differential timing of spring migration of male and female northern wheatears (Oenanthe oenanthe) (males migrating earlier). The study included two subspecies, heading towards […]

MAGNETIC ORIENTATION OF MIGRATORY WHEATEARS(OENANTHE OENANTHE) IN SWEDEN AND GREENLAND

Northern Wheatear (Oenanthe oenanthe) Science Article 5 abstract Orientation experiments were performed with wheatears (Oenanthe oenanthe) subjected to artificially manipulated magnetic fields, in Sweden and Western Greenland, during the autumn migration period. The objective was to compare responses by birds exposed to widely different geomagnetic conditions and, specifically, to clarify if birds are able to […]

MAGNETIC ORIENTATION OF MIGRATORY WHEATEARS(OENANTHE OENANTHE) IN SWEDEN AND GREENLAND

Northern Wheatear (Oenanthe oenanthe) Science Article 5 abstract Orientation experiments were performed with wheatears (Oenanthe oenanthe) subjected to artificially manipulated magnetic fields, in Sweden and Western Greenland, during the autumn migration period. The objective was to compare responses by birds exposed to widely different geomagnetic conditions and, specifically, to clarify if birds are able to […]

Daily stopovers as optimal migration strategy in a long-distance migrating passerine: the Northern Wheatear Oenanthe oenanthe.

Northern Wheatear (Oenanthe oenanthe) Science Article 3 abstract Selection for early arrival is expected to shape optimal stopover decisions in migrating birds to minimise time spent on migration. Optimality models predict that fuel loads at departure from stopover sites and stopover duration should depend strongly on search and settling costs as well as on individual […]

Daily stopovers as optimal migration strategy in a long-distance migrating passerine: the Northern Wheatear Oenanthe oenanthe.

Northern Wheatear (Oenanthe oenanthe) Science Article 3 abstract Selection for early arrival is expected to shape optimal stopover decisions in migrating birds to minimise time spent on migration. Optimality models predict that fuel loads at departure from stopover sites and stopover duration should depend strongly on search and settling costs as well as on individual […]

Optimal bird migration and predation risk: a field experiment with northern wheatears Oenanthe oenanthe

Northern Wheatear (Oenanthe oenanthe) Science Article 4 abstract Experiments testing predictions of optimal migration theory so far have concentrated on time and energy as the expenses that birds strive to minimize during migration. Taking advantage of the high variation in numbers of migrating raptors over the island of Helgoland, a field experiment with northern wheatears […]

Open-habitat birds in recently burned areas: the role of the fire extent and species’ habitat breadth

Black-eared Wheatear (Oenanthe hispanica) Science Article 1 abstract Single burned areas contained 0 to 15 open-habitat species (mean = 7.6), and in all the areas combined there were 22 species, including 17 with an unfavourable conservation status in Europe. The most frequent were Carduelis cannabina, Lullula arborea, Alectoris rufa, Oenanthe hispanica and Emberiza cia, but […]