Population research on small rodents (Rodentia) and shrews (Soricidae) in Lierne Municipality – Norway; 2018-2021 based on systematic catches with ordinary mouse traps in traplines

Sampling event
Latest version published by Nord University on Jan 10, 2022 Nord University
Publication date:
10 January 2022
Published by:
Nord University
CC-BY-NC 4.0

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The poulation cycles of small rodents and shrews in Lierne Municipality, Trondelag county in Norway have been followed during the years 2018-2021. Population index based on the same traplines and 3 times a year is investigated for the species: The Bank Vole (Myodes/Chletrionomys 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 2018-2021. Data also includes catches of the Common Shrew (Sores araneus), Pygmy Shrew (S. minutu) and Water Shrew (Neomys fodiens).

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 48 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)

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How to cite

Researchers should cite this work as follows:

Sørensen O J, Hagen B (2022): Population research on small rodents (Rodentia) and shrews (Soricidae) in Lierne Municipality – Norway; 2018-2021 based on systematic catches with ordinary mouse traps in traplines. v1.2. Nord University. Dataset/Samplingevent. https://ipt.gbif.no/resource?r=rodents&v=1.2


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; Shrews; Population cycles; Rodentia; Soricidae. Myodes glareolus; Myodes rufocanus; Microtus agrestis; Lemmus lemmus; Myopus schisticolor; Sorex araneus; Sorex minutus; Neomys fodiens.; Samplingevent


Ole Jakob Sørensen
  • Metadata Provider
Docent - emeritus
Nord University, Faculty of Biosciences and Aquaculture, Ecology Research Group
Box 2501
7725 Steinkjer
Trondelag County
Bjørn-Roar Hagen
  • Originator
Assistant professor
Nord. univ. Fac. of biosciences and aquaculture
Box 2501
7725 Steinkjer
Ole Jakob Sørensen
  • Metadata Provider
Docent emeritus
Nord University, Faculty of Biosciences and Aquaculture, Ecology Research Group
Box 2501
7725 Steinkjer
Trondelag County
Pål Fossland Moa
  • Point Of Contact
Associate professor
Nord univeristy; Fac. of Biosciences and Aquaculture
Box 2501
7725 Steinkjer
Trondelag County

Geographic Coverage

Lierne Municipality, Norway. The trap-lines are placed in North-boreal spruce dominated forest - one line in an oldgrowth, natural blueberry spruce forest - mixed with birch. The other line in a young, planted spruceforest after clearcutting, partly at the egde of minerotrofe herb-dominated bogs. Altitude approx. 540 masl.

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

Taxonomic Coverage

The catches are aimed on small rodents (Rodentia) and shrews (Soricidae). Main species will be: The Bank Vole (Myodes/Chletrionomys glareolus), The Grey-sided Vole, (M. rufocanus), The Field Vole (Microtus agrestis), The Wood Lemming (Myodes schisticolor), The Lemming (Lemmus lemmus), The Common Shrew (Sorex araneus), The Pygmy Shrew (S. minutus) and The Water Shrew (Neomys fodiens).

Order Rodentia (Rodents)
Family Soricidae (Shrews)

Temporal Coverage

Formation Period 2018 - 2021

Project Data

The Research collect data on small rodents and shrews in this forested area to follow populations dynamics through the years 1988 - 2021. This part is a follow up research for the years 2018 - 2021 for the same area and traplines.

Title https://ipt.gbif.no/manage/resource.do?r=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. Vegetation types is given in the dataset but mainly blueberry forest in the oldgrowth and more herb-dominated in the young, cultural forest.
Design Description Trapline with50 mouse traps sat at approx. 5 m. distance, staying out for 2 nights. See: Sampling methods

The personnel involved in the project:

Ole Jakob Sørensen
  • Metadata Provider

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: Mid June, late July/early August and September/October. The same traplines and trap spots have been used all years.

Study Extent The study was conducted from 1988 through 2021 and will continue for another year 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 trapline 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 shrew 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 Smågnagere og spissmus i Lierne kommune - Trondelag 1988-2021
Collection Identifier Ole Jakob Sørenen
Specimen preservation methods No treatment

Bibliographic Citations

  1. Sørensen, O.J., Moa, P.F. & Hagen, B-R. 2020. Populasjonen av smågnagere (Rodentia) og Spissmus (Soricidae) i Lierne og Steinkjer kommuner 1988 - 2019, og en rekonstruksjon av smågnagerdynamikken i tidligere Nord-Trøndelag 1871-2020. Nord universitet. FoU-Rapprot nr. 65. 1-54. (ISBN 978-82-7456-832-7) In Nowegian with an English Summary. ISBN 978-82-7456-832-7

Additional Metadata

Alternative Identifiers b5390d05-5699-4c46-a8a4-1b12aa2aac5b