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Solothurn, Switzerland

Wintering numbers of Eurasian Wigeon along the river Aare between the «Häftli» near Büren a.A. (canton of Berne) and the town of Solothurn (canton of Solothurn) strongly increased in the last decades. Most Wigeon are usually observed along the 7 km long stretch of the «Häftli», an oxbow lake of the Aare. Here, numbers started to increase in the first half of the 1990s. Between 2000/01 and 2013/14 the mean daily maximum per winter was 370 individuals. In five winters more than 400 individuals were observed on a single day, with a maximum of 550 on 12 January 2013. When the oxbow lake is completely ice-covered the Wigeon move to the stretch of the river downstream of Büren. As long as there is little human disturbance they graze on the adjacent fields. Overall wintering numbers in Switzerland from 2000 to 2013 according to the Swiss waterbird census amounted to a mean of 1397 individuals in January, not including the foreign parts of the transboundary lakes. In the study area a mean of 312 Wigeon were counted during the waterbird census, amounting to 22.3 [%] of the national total. The area is the most important wintering area for Wigeon in Switzerland. © 2015, ALA, All rights Reserved.

In the literature, the autumnal migration call of young Common Chiffchaffs Phylloscopus c. collybita is described with a plaintive, disyllabic «sweeoo» or similar. In the surroundings of Solothurn in western Switzerland, birds with this call type were not present every autumn and winter. In autumn 2008, with mostly continuous winds from NE, such calls were heard very frequently. Whether this call type is uttered just by young birds or also by adults from eastern populations or dialect areas is not known. Remarkablyy about half of the breeding birds uttered the «sweeoo» call in the breeding season 2009 around Solothurn. Both in 2010 and 2011 this call was not heard any more from breeding birds.

In June 2015, a pair of Western Bonelli’s Warblers nested in a garden at the edge of the village of Romont (canton of Berne, 700–750 m a.s.l.). The nest was situated in a embankment, at a distance of only 3 m from the street and 7.5 m from the house. © 2016, ALA. All rights reserved.

Aye R.,Schweizer Vogelschutz SVS BirdLife Schweiz | Bernardi E.,University of Lausanne | Christen W.,Langendorfstrasse 42 | Horch P.,Schweizerische Vogelwarte | And 12 more authors.
Ornithologische Beobachter | Year: 2013

The Corn Bunting is classified as Vulnerable according to the Swiss Red List and a priority species for recovery programmes. Its population in Switzerland has been estimated at 400 to 600 pairs in the years 1993-1996. The objective of the present study was to establish an updated population estimate for the period 2009-2011 and to identify the core areas for the conservation of the species. We based our population estimate on monitoring projects existing in four areas with corn bunting populations and for the rest of Switzerland on casual observations collected by the Swiss Ornithological Institute. This procedure resulted in an estimate of 93 to 103 territories on average for the years 2009-2011. The species has disappeared from many areas and a decline of about 80 % since the mid-1990s has to be assumed. Species recovery should therefore be of high priority in the remaining populations and in areas with a high potential. The current core areas of the species are the Champagne genevoise, the Grosses Moos, the Klettgau and the region from Lake Neuchâtel to Lake Geneva.

Martinez N.,Basellandschaftlicher Naturund Vogelschutzverband BNV | Martinez N.,Hintermann and Weber AG | Luthi T.,Vogelschutzverband des Kantons Solothurn VVS | Muller W.,Schweizer Vogelschutz SVS BirdLife Schweiz | And 7 more authors.
Ornithologische Beobachter | Year: 2013

The Middle Spotted Woodpecker Dendrocopos medius is one of 50 priority species for species recovery programmes in Switzerland and its Red List status is considered as Near Threatened. Nevertheless, knowledge of the exact distribution and accurate population size in several cantons containing strongholds of the species are inadequate or outdated. The poor quality of the data is mainly due to the cryptic life of the Middle Spotted Woodpecker. Thus, it can only be recorded reliably with species-specific survey methods. Population surveys with such methods were previously missing from the cantons of Basel-Landschaft, Basel-Stadt and Solothurn, although these cantons are known to be important distribution centres for the species. For these reasons, a species-specific survey was conducted in 2012 to assess population size and distribution of the Middle Spotted Woodpecker in potential habitats in these cantons. Simultaneously, the same method was applied in adjacent regions of the canton of Bern. Overall, we found 415 territories, and we estimated total population size for the four cantons at 455 to 610 breeding pairs. This corresponds to a fivefold increase compared to older data. The comparison with existing data shows that this difference is partly due to methodological differences between the surveys. However, part of the observed increase is also due to a real population increase and an associated range expansion. Due to the large and increasing population, the Middle Spotted Woodpecker is barely threatened in northwestern Switzerland for the moment. However, since oaks of medium ages classes are rare in many forests because oak regeneration was neglected in the 20th century, specific measures for the Middle Spotted Woodpecker should remain an important component of forest management.

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