Population research on small rodents (Rodentia) and screws (Soridae) in Lierne Municipality – Norway; 2018-2019 based on systematic catches with ordinary mouse traps in traplines
The poulation cycles of small rodents in Lierne Municipality, Trondelag county in Norway have been followed during the years 1988-2019. Population index based on the same traplines and 3 times a year is investigated for the species: The Bank Vole (Myodes/Cheltrionomys glareolus; The Grey-Backed Vole (M. rufocanus), The Field Vole (Microtus agrestis, The Wood Lemming (Myopus schisticolor) and Lemming (Lemmus lemmus). Here is presented the data for 2018-2019.
The data in this sampling event resource has been published as a Darwin Core Archive (DwC-A), which is a standardized format for sharing biodiversity data as a set of one or more data tables. The core data table contains 12 records.
3 extension data tables also exist. An extension record supplies extra information about a core record. The number of records in each extension data table is illustrated below.
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How to cite
Researchers should cite this work as follows:
Sorensen, O.J., Moa, P.F., Hagen, B-R. (2020) Population cycles of small rodents in Lierne, Norway 2018 - 2019.
Researchers should respect the following rights statement:
The publisher and rights holder of this work is Nord University. This work is licensed under a Creative Commons Attribution Non Commercial (CC-BY-NC) 4.0 License.
Occurrence; Small rodents; Screws; Population cycles; Rodentia; Screws. Myodes glareolus; Myodes rufocanus; Microtus agrestis; Lemmus lemmus; Myopus schisticolor; Sorex araneus; Sorex minutus; Neomys fodiens.
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|Bounding Coordinates||South West [64.4, 13.813], North East [64.41, 13.83]|
|Formation Period||2018 - 2019|
The Research collect data on small rodents and screws in this forested area to follow populations cycles through the years 1988 - 2017. THis part is a follow up research for the years 2018 - 2019 for the same area and traplines.
|Identifier||Ole Jakob Sørensen|
|Funding||North-Trondelag Regional College. North-Trondelag University College Nord University North Trondelag County Muincipality The Norwegian Environment Agencies|
|Study Area Description||The study area is in a Northern Boreal Spruce (Picea abies) dominated forest about 540 m-a.s.l. One part of the trapline is in old-Growth Spruce forest, the other half is in young succession, planted spruce forest after a clearcut from approx. 1960. Vegetaion types is given in the dataset.|
|Design Description||Trapline With mouse traps. See: Sampling methods|
The personnel involved in the project:
Ordinary mouse traps (for killing mouse) have been put out with 5 m. distance through the two traplines, each with 50 traps, bated with raw potatoes. Traps are with few exceptions out for 2 nights and 3 times a year: June, early August and September. The same traplines and trap spots have been used all years.
|Study Extent||The study was conducted from 1988 through 2019 and will continue for another 3 years 2020-2022 with collection of more detailed data. The approximate coordinates for the trapsites is: N64.24.20 - E13.49.00 in Lierne municipality, Trondelag county, Norway. Habitat is Northern boreal spruce forest. One traline is placed in natural old-growth blueberry-dominated forest. The second trapline is placed in younger succsession cultural spruce forest, edging a richer vegetation and wet, rich minerogen mire. The traplines are located approx. 540 m.a.s.l..|
|Quality Control||Mouse and screw species are visually determined on spot, aged as adult, subadult and juveniles, weighed and sexed whenever possible.|
Method step description:
- The results give a total and species specific, population index calculated as number/100 Catch-Nights. The results will give an comparable index for population cycles over a 35 years period for this area.
|Collection Name||Ole Jakob Sørensen|
|Specimen preservation methods||No treatment|