Brutzeitliche Beutewahl beim SeggenrohrsängerAcrocephalus paludicola

Schulze‐Hagen, Karl; Flinks, Heiner; Dyrcz, Andrzej

doi:10.1007/bf01649760

Cited by 27 publications

(23 citation statements)

References 1 publication

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“…The diet composition of aquatic warbler observed at the migration stopover sites of Audierne marshes is similar to that observed by Schulze-Hagen, Flinks & Dyrcz, (1989) in the species' breeding areas: the diet predominantly consists of Araneida, Diptera and Coleoptera (30, 22 and 15%, respectively, in Schulze-Hagen's study and 14, 38 and 6% in this study). Small numbers of larger prey species such as Orthoptera, Lepidoptera and Odonata are also reported in -Hagen et al, 1989).…”

Section: Diet Specificitysupporting

confidence: 74%

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Diet and fuelling of the globally threatened aquatic warbler at autumn migration stopover as compared with two congeners

Kerbiriou¹,

Bargain²,

Viol³

et al. 2010

Animal Conservation

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The effective conservation of aquatic warbler Acrocephalus paludicola, one of the most threatened western Palaearctic migratory passerines, requires good knowledge of its ecological needs at stopover sites. In particular, identifying its diet, which controls the accumulation of fat reserves during migration, facilitates the selection and management of adequately protected areas. Further key information includes the relationship between prey species abundance and habitats of aquatic warbler on stopover. We performed standardized mist netting in the Audierne marshes (western France) during 12 years, which resulted in the capture of 1200 aquatic warblers, and provided measurements for mass gain and the collection of faeces to infer the birds' diet. Invertebrate sampling was carried out in the three main Audierne marsh habitats (reed bed, fen mire and meadow). In order to go beyond prey digestibility bias, we also studied two closely related Acrocephalus species, present at migration stopover sites during the same period. We found that the diet composition of aquatic warbler observed at migration stopover sites is based on large-sized prey (Odonata, Orthoptera, Lepidoptera). Like sedge warblers, aquatic warblers put on weight during migration stopovers (daily mass gain = 0.38 g). This increase in weight suggests that the aquatic warblers might have adopted a strategy for long-distance migration with few stopovers only. Owing to great differences in diet, conservation management for the threatened aquatic warbler at stopover sites should not rely on existing knowledge about sedge and reed warblers. Similarities in the diet of aquatic warbler between nesting areas and migration stopover areas and the relationship between habitat and prey abundance suggest that fen mires play an important role in the quality of the foraging habitat at stopover sites.

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Section: Diet Specificitysupporting

confidence: 74%

“…Small numbers of larger prey species such as Orthoptera, Lepidoptera and Odonata are also reported in -Hagen et al, 1989). Leisler (1985) found 12.1 mm prey sizes at breeding sites.…”

Section: Diet Specificitymentioning

confidence: 88%

Diet and fuelling of the globally threatened aquatic warbler at autumn migration stopover as compared with two congeners

Kerbiriou¹,

Bargain²,

Viol³

et al. 2010

Animal Conservation

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“…The diet of the Aquatic Warbler highlighted in the Gironde estuary has some similarities with the diet observed in breeding areas (Schulze-Hagen et al 1989) and on other French stopover sites (Audierne Bay - Kerbiriou et al 2011;Seine estuary -Provost et al 2010). For example, in terms of proportion of prey number, Diptera represent 21.6% of the diet composition in the Gironde estuary, 22% in the breeding areas, 38% in Audierne Bay and 27% in Seine estuary.…”

Section: Diet Studymentioning

confidence: 86%

Ecology of Aquatic WarblersAcrocephalus paludicolain a Fall Stopover Area on the Atlantic Coast of France

et al. 2014

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The Aquatic Warbler Acrocephalus paludicola is the only endangered songbird in continental Europe. This trans-Saharan migratory bird significantly transits along the French Atlantic coastline during post-breeding migration and the right bank of the Gironde estuary has been identified as an important stopover site. We studied the spatial occupancy strategies of stationing individuals during August of three successive years (2010)(2011)(2012). We characterized habitat use by radio-tracking individuals revealing relatively small foraging ranges (6.6 ± 2.6 ha on average) with only 1 ha actually exploited (core area), and a relatively high habitat fragmentation rate. Capture-mark-recapture analyses assessed the average stopover duration of individuals and body-mass variations during their stopover. The estimated average stopover duration was 6.46 ± 0.46 days (95% confidence interval: 4.4-9.6). Lean birds tended to forage significantly more than stout birds: on average, they gain 2.81 ± 0.89% of their initial mass each day whereas stout birds only gain 0.12 ± 0.56%. Analyses of droppings characterized the local diet. We noticed that Aquatic Warbler preferentially used partially-flooded or flooded habitats with heterogeneous and rather low vegetation, such as bulrush beds or bulrush beds mixed with reed beds. Orthoptera, Araneae and Hymenoptera represented the largest contributions to the consumed biomass (64.7%, 13.4% and 8.9% respectively). The importance of the fuel deposition rate of lean birds reflects the importance of the estuary as a stopover site for the species. It means that the available resources allow birds to replenish and continue their migration route. However, the sustainability of the site's functionality is questioned because of the evolution of habitats (erosion, rise in water levels and changes in food web).

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“…However, in the Willie Wagtail the antipredator aspect does not seem important because the birds obviously do not make efforts to conceal the nest, relying rather on nest defence. Strong selection of larger arthropods for feeding nestlings was found in the Aquatic Warbler Acrocephalus paludicola inhabiting vast open Carex fen (Schulze-Hagen et al 1989). Also Hespenheide (1971), investigating the food of adults in two species of swift and swallow in Central America, found that the mean size of prey was significantly larger than that of the available insects.…”

Section: Adultsmentioning

confidence: 99%

Nestling and Adult Diet of the Willie Wagtail Rhipidura leucophrys Near Madang, Papua New Guinea

Dyrcz

Flinks²

1995

Emu - Austral Ornithology

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Brutzeitliche Beutewahl beim SeggenrohrsängerAcrocephalus paludicola

Cited by 27 publications

References 1 publication

Diet and fuelling of the globally threatened aquatic warbler at autumn migration stopover as compared with two congeners

Diet and fuelling of the globally threatened aquatic warbler at autumn migration stopover as compared with two congeners

Ecology of Aquatic WarblersAcrocephalus paludicolain a Fall Stopover Area on the Atlantic Coast of France

Nestling and Adult Diet of the Willie Wagtail Rhipidura leucophrys Near Madang, Papua New Guinea

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