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Sammanfattning

The influence of spatial location and density of beech snags on species diversity and distribution patterns of saproxylic beetles was studied in a 2,400 ha forest landscape in southern Sweden. Complete snag surveys were combined with a beetle survey using small window traps directly attached to the beech snags. The density of beech snags a parts per thousand yen30 cm dbh varied between one and seven snags per ha within the study area, corresponding to 1.1-5.1 m(3)/ha. A total of 2,610 specimens of 180 saproxylic beetles species were trapped, of which 19 species were red-listed. Within the study area, the number of red-listed and formerly red-listed species was highest around traps in old-growth stands, intermediate in managed stands contiguous with old-growth and lowest in managed stands isolated from old-growth by a two km-wide zone without beech forest. Logistic regressions revealed negative relationships between distance to old-growth forest and occurrence of eleven species, among them six red-listed or formerly red-listed species. The number of non red-listed species was not correlated with isolation from old-growth forest. The number of red-listed species also increased with snag density within 200-300 m around the traps. Our results suggest that red-listed species generally have a lower dispersal capacity than other saproxylic beetles. We conclude that retention of dead wood close to existing populations is more beneficial for red-listed species than an even distribution of snags across the forest landscape.

Nyckelord

Beech snags; Coarse woody debris; Dispersal limitation; Red-listed species; Southern Sweden; Window traps

Publicerad i

Biodiversity and Conservation
2009, volym: 18, nummer: 9, sidor: 2387-2404

SLU författare

Globala målen (SDG)

SDG15 Ekosystem och biologisk mångfald

UKÄ forskningsämne

Miljö- och naturvårdsvetenskap

Publikationens identifierare

  • DOI: https://doi.org/10.1007/s10531-009-9595-5

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/22632