http://tun.fi/HR.4831
Name:
Small rodent index data
Name (fi):
Pikkujyrsijäindeksiaineisto
Publisher short name:
Luke
Publisher short name (fi):
Luke
Type:
Other
Description:
Trapping indices of small rodents from nationwide monitoring census, separately for field and forest habitats, spring and summer. Indices are pooled numbers of all trapped small rodents.
Description (fi):
Valtakunnallisen pikkujyrsijöiden seurantapyyntien runsausindeksit, erikseen pelto- ja metsähabitaateille, keväälle ja syksylle. Indekseissä laskettu yhteen kaikki saaliiksi saadut pikkujyrsijät.
Taxonomic coverage:
Rodentia
Temporal coverage:
2000- (in public), available from 1974 onwards upon request.
Coverage basis:
Small rodents of Finland
Geographic coverage:
Finland
Methods:
Small rodent abundance index data are collected biannually, in spring and autumn, in forested and open habitats locations throughout Finland. Trapping is in conducted in two habitat types in almost all locations: spruce (Picea abies) or mountain birch (Betula pubescens subsp. czerepanovii) forests and in open grassland habitats, primarily old agricultural land no longer in use. Spring trapping takes place between mid-March and mid-June and autumn trapping between mid-August and mid-October, depending on local climate. Trapping is conducted with standard metal mouse snap traps, baited with bread. At each location, ca. 50–100 traps are set either (i) in a line, in clusters of three traps with an inter-trap distance of 1–2 m and an intercluster distance of 10–20 m, or (ii) according to the small quadrate method (Myllymäki et al., 1971). Traps are set for 1–4 nights and checked and and re-set if necessary once a day. Trap nights refers to the number of traps set multiplied by the number of nights a give trapping session lasted.
The density index is calculated as: [(pooled number of trapped rodents + 1) / (number of trap nights)] x 100, separately for field and forest habitats.
Myllymäki A, Paasikallio A, Pankakoski E, Kanervo V (1971) Removal experiments on small quadrats as a means of rapid assessment of the abundance of small mammals. Annales Zoologici Fennici, 8, 177–178.
The density index is calculated as: [(pooled number of trapped rodents + 1) / (number of trap nights)] x 100, separately for field and forest habitats.
Myllymäki A, Paasikallio A, Pankakoski E, Kanervo V (1971) Removal experiments on small quadrats as a means of rapid assessment of the abundance of small mammals. Annales Zoologici Fennici, 8, 177–178.
License for use:
Creative Commons Attribution
Embargo in years:
5
% digitized (approx.):
90
Person responsible:
Otso Huitu
Citation recommendation:
Luonnonvarakeskus (Luke); Korpela, K., Delgado, M., Henttonen, H., Korpimäki, E., Koskela, E., Ovaskainen, O., Pietiäinen, H., Sundell, J., Yoccoz, N.G. & Huitu, O. 2013. Nonlinear effects of climate on boreal rodent dynamics: mild winters do not negate high-amplitude cycles. Global Change Biology 19: 697–710.
Language:
english
Status of this metadata:
comprehensive
Contact email:
otso.huitu@luke.fi
Collection quality:
Professional / professionally curated
Notes about the data:
Species-specific data available upon request from Luke / contact person.
Bounding box latitude min (WGS84):
60.484988
Bounding box latitude max (WGS84):
68.422252
Bounding box longitude min (WGS84):
22.740282
Bounding box longitude max (WGS84):
30.372298