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Predicting spatial occurrence of beetles and pseudoscorpions in hollow oaks in southeastern Sweden

Ranius, Thomas and Johansson, Victor and Fahrig, Lenore (2011). Predicting spatial occurrence of beetles and pseudoscorpions in hollow oaks in southeastern Sweden. Biodiversity and conservation. 20 :9 , 2027-2040
[Research article]

[img] PDF - Accepted Version

Official URL: http://link.springer.com/article/10.1007%2Fs10531-...


We modelled presence/absence per tree of beetles and pseudoscorpions living in tree hollows in relation to trunk circumference, habitat openness, and connectivity (= density of hollow oaks in the surrounding area), using data from 281 oaks. The presence/absence models were then used to predict species’ occurrences in a county (11,600 km²) in southeastern Sweden. For eight of the nine species, the most parsimonious occupancy model included a positive relationship with connectivity and at least one tree characteristic. Occupancy underestimates from occurrence records - the ratio of the area of occupancy based on our predictive model to the area of occupancy based on occurrence records - varied between 3 and 83 among species when using occurrence records up to 1993, with significantly larger underestimates for smaller beetle species. Today (after extensive surveys), underestimation has decreased to 1.3 – 25, confirming that calculations solely based on species occurrence records greatly underestimate the area of occupancy. We suggest this should be taken into account to a greater extent and in a clearer way than today when constructing redlists. The radius of the connectivity measure that generated the best fit varied between 135 m and 2,857 m among species, with longer distances for more threatened species. Consequently, preservation of the most threatened species (Elater ferrugineus and Tenebrio opacus) requires conservation efforts at larger spatial scales than required to protect Osmoderma eremita, which frequently has been used as an indicator and umbrella species.

Authors/Creators:Ranius, Thomas and Johansson, Victor and Fahrig, Lenore
Title:Predicting spatial occurrence of beetles and pseudoscorpions in hollow oaks in southeastern Sweden
Series Name/Journal:Biodiversity and conservation
Year of publishing :2011
Page range:2027-2040
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Accepted version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Keywords:connectivity, Quercus robur, redlist, spatial occurrence patterns, scale, spatial extent
Permanent URL:
ID Code:11011
Faculty:NL - Faculty of Natural Resources and Agricultural Sciences (until 2013)
Department:(NL, NJ) > Dept. of Ecology
(S) > Dept. of Ecology
External funders:FORMAS
Deposited By: Thomas Ranius
Deposited On:04 Mar 2014 10:36
Metadata Last Modified:25 Apr 2015 08:44

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