Tag: all of Acrocephalus

Movement patterns of European Reed Warblers Acrocephalus scirpaceus and Sedge Warblers A. schoenobaenus before and during autumn migration.

Sedge Warbler (Acrocephalus schoenobaenus) Science Article 9 abstract The foraging movements of European Reed Warblers Acrocephalus scirpaceus and Sedge Warblers Acrocephalus schoenobaenus at migratory stopover sites were studied by comparing the frequency distribution of distances between capture-recapture localities of individual birds with a simulation model of a random distribution of movements. The results indicate that […]

Stabilising selection on wing length in reed warblers Acrocephalus

Sedge Warbler (Acrocephalus schoenobaenus) Science Article 5 abstract The size of an animal is of utmost importance for its overall success and each species isthought to have its own optimal size. If this is true, size traits ought to be understabilising selection unless the animal is living in a highly unstable environment. Winglength is a […]

Song and the song control pathway in the brain can develop independently of exposure to song in the sedge warbler

Sedge Warbler (Acrocephalus schoenobaenus) Science Article 7 abstract Previous studies have shown that female sedge warblers choose to mate with males that have more complexsongs, and sexual selection has driven the evolution of both song complexity and the size of the majorsong control area (HVc) in the brain. In songbirds, learning from conspeci? cs plays […]

Fat and pectoral muscle in migrating Sedge Warblers Acrocephalus schoenob nus

Sedge Warbler (Acrocephalus schoenobaenus) Science Article 1 abstract Increases in fat and pectoral muscle mass are important physiological changes associated with migration, but the extent to which these are linked is uncertain. The relationship between fat and pectoral muscle in first-year Sedge Warblers Acrocephalus schoenob nus was investigated using the carcasses of 20 birds that […]

Dutch Sedge Warblers Acrocephalus schoenobaenus and West-African rainfall: Empirical data and simulation modelling show low population resilience in fragmented marshlands.

Sedge Warbler (Acrocephalus schoenobaenus) Science Article 8 abstract Sedge Warbler populations in The Netherlands have declined dramatically over the last 25 years, especially between 1973-75 and 1982-85. Population declines correlate with yearly rainfall in the western part of the Sahel-Soudan zone, the most probable wintering area of West-European birds (after removing effects of autocorrelation, rs […]

Survival rates of adult Reed Warblers Acrocephalus scirpaceus at a northern and southern site in England

Sedge Warbler (Acrocephalus schoenobaenus) Science Article 10 abstract Mark-recapture ringing data from Wicken Fen in Cambridgeshire and Gosforth Park in Newcastle upon Tyne were used to estimate adult survival rates in a southerly and a northerly population of Reed Warblers in England. The computer program MARK was used to estimate survival and recapture rates, adjusted […]

Does tape-luring of migrating eurasian reed-warblers increase number of recruits or capture probability?

Sedge Warbler (Acrocephalus schoenobaenus) Science Article 3 abstract Tape-luring often is used in studies of bird migration, and the technique can strongly augment the total number of birds captured. Additional captures from tape-luring could result from increasing the capture probability of birds already at the stopover site, or from attracting birds that normally would have […]

High Migratory Fuel Loads Impair Predator Evasion in Sedge Warblers

Sedge Warbler (Acrocephalus schoenobaenus) Science Article 6 abstract During migration, many species of birds rely onstored fat for fuel. The extra mass taken on for migrationentails costs (Witter and Cuthill 1993). Timeand energy must be devoted to foraging to build upfat loads, and increased feeding may increase therisk of being attacked by predators. An additionalcost […]

The study of bird migration across the WesternSahara; a contribution with sound luring

Sedge Warbler (Acrocephalus schoenobaenus) Science Article 4 abstract During spring and autumn migration 2003, the Swiss Ornithological Institute set up a concerted project in Mauritania to study bird migration across the Sahara. I participated with a side project using artificial induction of landfall with sound luring in an attempt to overcome the potential problem of […]

How does age and body condition affect migratory restlessness and orientation in Reed Warblers Acrocephalus scirpaceus?

Sedge Warbler (Acrocephalus schoenobaenus) Science Article 2 abstract Orientation cage experiments were performed with 260 Reed Warblers on the southern coast of Spain during autumn 1996, in order to test the hypothesis that birds in good body condition should exhibit a higher amount of migratory restlessness and an activity concentrated more strongly towards one direction […]