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

Latest version published by Nord University on Mar 25, 2020 Nord University

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.

Data Records

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.

  • Event (core)
  • Occurrence 
  • ExtendedMeasurementOrFact 
  • MeasurementOrFact 

This IPT archives the data and thus serves as the data repository. The data and resource metadata are available for download in the downloads section. The versions table lists other versions of the resource that have been made publicly available and allows tracking changes made to the resource over time.


Download the latest version of this resource data as a Darwin Core Archive (DwC-A) or the resource metadata as EML or RTF:

Data as a DwC-A file download 12 records in English (13 KB) - Update frequency: irregular
Metadata as an EML file download in English (10 KB)
Metadata as an RTF file download in English (9 KB)


The table below shows only published versions of the resource that are publicly accessible.

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.

GBIF Registration

This resource has been registered with GBIF, and assigned the following GBIF UUID: b5390d05-5699-4c46-a8a4-1b12aa2aac5b.  Nord University publishes this resource, and is itself registered in GBIF as a data publisher endorsed by GBIF Norway.


Occurrence; Small rodents; Screws; Population cycles; Rodentia; Screws. Myodes glareolus; Myodes rufocanus; Microtus agrestis; Lemmus lemmus; Myopus schisticolor; Sorex araneus; Sorex minutus; Neomys fodiens.


Who created the resource:

Ole Jakob Sørensen
Nord University, Faculty of Biosciences and Aquaculture, Ecology Research Group Box 2501 7718 Steinkjer Trondelag County NO 004791804899

Who can answer questions about the resource:

Ole Jakob Sørensen
Nord University, Faculty of Biosciences and Aquaculture, Ecology Research Group Box 2501 7718 Steinkjer Trondelag County NO 004791804899
Pål Fossland Moa
Associate professor
Nord univeristy; Fac. of Biosciences and Aquaculture Box 2501 7718 Steinkjer Trondelag County NO 004745613872

Who filled in the metadata:

Ole Jakob Sørensen
Nord University, Faculty of Biosciences and Aquaculture, Ecology Research Group Box 2501 7718 Steinkjer Trondelag County NO 004791804899

Who else was associated with the resource:

Ole Jakob Sørensen

Geographic Coverage

Lierne, Norway

Bounding Coordinates South West [64.4, 13.813], North East [64.41, 13.83]

Temporal Coverage

Formation Period 2018 - 2019

Project Data

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.

Title Rodents
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:

Metadata Provider
Ole Jakob Sørensen

Sampling Methods

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:

  1. 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 Data

Collection Name Ole Jakob Sørensen
Specimen preservation methods No treatment

Additional Metadata

Alternative Identifiers https://ipt.gbif.no/resource?r=rodents