• Der bedrohte Kiebitz Vanellus vanellus ist der "Wappenvogel" der Ala. Dieses Küken ist erst wenige Tage alt.

  • Die Ala hat zu ihrem 100-jährigen Bestehen 2009 mehrere Schutz- und Forschungsprojekte zugunsten des Kiebitzes unterstützt.

  • Der Tannenhäher Nucifraga caryocatactes versteckt jedes Jahr mehrere 10'000 Arvennüsse als Wintervorrat – und findet die meisten wieder.

  • slider 01

    Die exotisch wirkende Bartmeise Panurus biarmicus ist die einzige Vertreterin ihrer Familie in Europa.

  • Der Turmfalke Falco tinnunculus ist der häufigste Falke in der Schweiz.

  • Der Haubentaucher Podiceps cristatus ist bekannt für seine spektakulären Balzrituale.

  • Das hübsche Blaukehlchen Luscinia svecica ist in Europa mit mehreren Unterarten vertreten. Das weisssternige kommt in der Schweiz ausschliesslich als Durchzügler vor.

  • Der Graureiher Ardea cinerea wurde früher als Fischfresser verfolgt und fast ausgerottet, mittlerweile hat sich der Bestand in der Schweiz erholt.

Artikel-Suche


einfache Suche | erweiterte Suche
Autor(en)
Ueli Bühler
Titel
Vorkommen des Weissrückenspechts Dendrocopos leucotos und Waldnutzung in Nordbünden.
Jahr
2021
Band
118
Seiten
58–75
Key words
(von 1994 bis 2006 vergeben)
Schlagwort_Inhalt
Bestandsentwicklung, Reviere, Dichte, Winter, Lebensraum, Habitatqualität, Höhenverbreitung, Waldzustand, Forstwirtschaft, Altholz, Totholz, Waldbewirtschaftung, Schutzwald, Naturwaldreservate, Altholzinseln, Biotopbäume
Schlagwort_Vogelart
(wissenschaftlich)
Dendrocopos leucotos
Schlagwort_Vogelart
(deutsch)
Weissrückenspecht
Schlagwort_Geographica
Prättigau, Churer Rheintal, Graubünden, Schweiz
Sprache
deutsch
Artikeltyp
Abhandlung
Abstract
Occurrence of White-backed Woodpecker Dendrocopos leucotos and forest use in northern Grisons. – From 1997 to 2019, a systematic investigation for White-backed Woodpecker occurrences was carried out in a 254 km2 study area in the Prättigau and Rhine Valley near Chur. The area is limited to the colline to upper-montane altitudinal range between 490 and 1550 m a.s.l. and contains 54 % forest. The investigation concentrated on 37 potentially suitable areas characterised by a large supply of deadwood and old trees with a structurally rich habitus, covering 21.98 km2. White-backed Woodpeckers have been recorded in 21 of these areas. However, many areas were irregularly occupied. A maximum of 9 simultaneously occupied areas were verified in one year. Apparently, there were also roving White-backed Woodpeckers. The total population is estimated at a maximum of 11–14 pairs, which is obviously subject to considerable fluctuations. The observation series indicates a slight increase during the survey, but only to the extent of one newly populated area per 6–15 years. The species was also found in winter in the breeding areas. Statistics on wood logging and data from the regional forest inventory show that only about one third of the timber growth in the presently occupied forests has been used for 60 years, resulting in significantly higher deadwood stocks than in the surrounding forests. The occupied forests can be characterized as being in the mature optimum phase with the beginning of decay. Considered at large scale, the supply of deadwood at the end of the study period was, however, obviously still too small to maintain a stable population. Presumably there are small-scale deadwood accumulations that ensure the survival of the species in the northern Grisons. However, it is also possible that the deadwood, which has only emerged in recent decades, is still too sparsely populated by arthropods. The example of the North Grisons shows that the application of the principles of near-natural forestry alone is not enough to secure White-backed Woodpecker habitats. More far-reaching measures are needed to ensure that a sufficient amount of deadwood is continuously being created in managed forests. The establishment of a network of natural forest reserves, old-growth patches and habitat trees, as is currently happening in the canton of Grisons, will make a significant contribution to this. The White-backed Woodpecker is only one of many species that depend on a high deadwood supply.
PDF Dokument (öffentlich)
PDF Dokument (registrierte Mitglieder)
 

Login

Nach erfolgreichem Login stehen Ihnen alle PDFs zum Download zur Verfügung.