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Relict of primeval forests in an intensively farmed landscape: what affects the survival of the hermit beetle (Osmoderma barnabita) (Coleoptera: Scarabaeidae) in pollard willows?
Relict of primeval forests in an intensively farmed landscape: what affects the survival of the hermit beetle (Osmoderma barnabita) (Coleoptera: Scarabaeidae) in pollard willows?
- Source :
- Journal of Insect Conservation. 25:407-415
- Publication Year :
- 2021
- Publisher :
- Springer Science and Business Media LLC, 2021.
-
Abstract
- The hermit beetle (Osmoderma barnabita) is an internationally protected specialist of tree hollows considered a relic of primeval forests. The backbone of its distribution in eastern Czechia, however, is a system of pollard willows in intensively farmed lowlands. Pollarding, a traditional agroforestry practice inducing formation of tree hollows, was partly abandoned in the area during the twentieth century. To assess the state of the system of pollard willows and to investigate parameters of pollards and their stands which affect the beetle’s presence. We inventoried pollard trees and beetle distribution across ca 2000 km2 of lowlands along the Dyje, Morava and Odra rivers and their tributaries in eastern Czechia and westernmost Slovakia. We found 10 441 pollard willows in 324 stands: most stands contained trees of large diameters and poor health; young trees were rare. Probability of O. barnabita presence increased with number of trees in stand, decreased with distance to the nearest occupied stand, and was further affected by the health state of trees. Our results show that high hollow density in pollards allows for the existence of specialized, dispersal limited forest organisms in virtually deforested landscapes. They suggest stands should contain at least 200–300 pollard willows to sustain the beetle population. Although the beetle is still widespread over the study area, the existing populations are isolated and subjected to extinction debt. Large-scale restoration of pollarding practice, planting and pollarding of numerous young trees, and increasing connectivity is vital to facilitate the survival of this hermit beetle population but also support other hollow associated organisms.
- Subjects :
- 0106 biological sciences
Scarabaeidae
geography
education.field_of_study
geography.geographical_feature_category
Ecology
biology
Population
Biodiversity
biology.organism_classification
Old-growth forest
010603 evolutionary biology
01 natural sciences
Pollarding
010602 entomology
Animal ecology
Insect Science
Biological dispersal
Animal Science and Zoology
education
Nature and Landscape Conservation
Extinction debt
Subjects
Details
- ISSN :
- 15729753 and 1366638X
- Volume :
- 25
- Database :
- OpenAIRE
- Journal :
- Journal of Insect Conservation
- Accession number :
- edsair.doi...........0142c0d81f8c5a450a57919846e2f125
- Full Text :
- https://doi.org/10.1007/s10841-021-00309-8