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Walter Christen

Ganzjährige Erfassung von Vögeln in einem kleinen Feuchtgebiet in der Aareebene (Kanton Solothurn) von 1983 bis 2019.

2021

118

166–183

Key words
(von 1994 bis 2006 vergeben)

Feuchtgebiet, Langzeitstudie, Artenzahl, Phänologie, Erstankunft, Bestandsentwicklung, Trend, Präsenz

Schlagwort_Vogelart
(wissenschaftlich)

Phasianus colchicus, Pica pica, Passer domesticus, Sylvia communis, Tachybaptus ruficollis, Phylloscopus trochilus, Carduelis carduelis, Prunella modularis, Gallinula chloropus, Anas platyrhynchos, Motacilla alba, Acrocephalus palustris, Accipiter nisus, Locustella naevia, Passer montanus, Rallus aquaticus, Emberiza schoeniclus, Fulica atra, Chloris chloris, Sylvia borin, Anas crecca, Turdus pilaris, Troglodytes troglodytes, Emberiza citrinella, Acrocephalus scirpaceus, Turdus merula, Fringilla coelebs, Corvus corone corone, Sturnus vulgaris, Turdus iliacus, Phylloscopus collybita, Sylvia atricapilla, Turdus philomelos, Falco tinnunculus, Gallinago gallinago, Erithacus rubecula, Buteo buteo, Coccothraustes coccothraustes, Columba oenas, Cuculus canorus, Cyanistes caeruleus, Parus major, Columba palumbus, Ardea cinerea, Dendrocopos major, Luscinia megarhynchos, Garrulus glandarius, Lanius collurio, Poecile palustris, Certhia brachydactyla

Schlagwort_Vogelart
(deutsch)

Jagdfasan, Elster, Haussperling, Dorngrasmücke, Zwergtaucher, Fitis, Stieglitz, Heckenbraunelle, Teichhuhn, Stockente, Bachstelze, Sumpfrohrsänger, Sperber, Feldschwirl, Feldsperling, Wasserralle, Rohrammer, Blässhuhn, Grünfink, Gartengrasmücke, Krickente, Wacholderdrossel, Zaunkönig, Goldammer, Teichrohrsänger, Amsel, Buchfink, Rabenkrähe, Star, Rotdrossel, Zilpzalp, Mönchsgrasmücke, Singdrossel, Turmfalke, Bekassine, Rotkehlchen, Mäusebussard, Kernbeisser, Hohltaube, Kuckuck, Blaumeise, Kohlmeise, Ringeltaube, Graureiher, Buntspecht, Nachtigall, Eichelhäher, Neuntöter, Sumpfmeise, Gartenbaumläufer

Aareebene, Grenchen, Solothurn, Schweiz

deutsch

Abhandlung

Year-round recording of birds in a small wetland in the Aare plain (canton of Solothurn) from 1983 to 2019. – In the 6-ha wetland «Altwasser» near Grenchen (canton of Solothurn), all bird species and individuals were recorded on regular short surveys throughout the year from 1983 to 2019. The visits took place preferably once per 5-days-period and lasted 30 minutes. A distinction was made whether birds were on the ground («users») or flying over the area («overflyers»). A total of 180 bird species were detected on the scheduled visits. The long-term mean number of species detected per visit was 20.2, of which 16.5 species were users and 3.7 species were overflyers. The mean number of species was greatest during spring and autumn migration, and lowest in winter and during the breeding season. Per visit, a mean of 74 individuals were counted as users. Of the 180 species, nine species achieved a «presence» (proportion of 5-days-periods in which at least one individual of a species was observed) greater than 50 %: Eurasian Blackbird, Carrion Crow, Yellowhammer, Common Chaffinch, Reed Bunting, European Greenfinch, Eurasian Tree Sparrow, Eurasian Blue Tit, and Great Tit. The majority (129 species) achieved a presence of less than 10 %. Some of the 50 most frequent user species showed strong decreases or increases in presence: In the second half of the survey period, ten species decreased strongly (e.g., Common Pheasant, Eurasian Magpie, House Sparrow, Common Whitethroat, Little Grebe), and 17 species increased markedly (e.g., Short-toed Treecreeper, Marsh Tit, Red-backed Shrike, Eurasian Jay, Common Nightingale). The presence of numerous long-distance migrants showed a negative trend. Red-listed species have also declined. A clear increase in presence was observed in resident birds. Because of the large increase in shrubs and trees at a former landfill, many changes in presence were influenced by forest succession. Forest species have generally increased.
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