A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Functional response of the least weasel, Mustela nivalis nivalis
Tekijät: Sundell J, Norrdahl K, Korpimaki E, Hanski I
Kustantaja: MUNKSGAARD INT PUBL LTD
Julkaisuvuosi: 2000
Journal: Oikos
Tietokannassa oleva lehden nimi: OIKOS
Lehden akronyymi: OIKOS
Vuosikerta: 90
Numero: 3
Aloitussivu: 501
Lopetussivu: 508
Sivujen määrä: 8
ISSN: 0030-1299
DOI: https://doi.org/10.1034/j.1600-0706.2000.900308.x
Tiivistelmä
We investigated the functional response of the least weasel (Mustela nivalis nivalis) in a series of experiments conducted in large outdoor enclosures (0.5 ha). Radiocollared Micotus voles were released in the enclosures at different densities (4, 8, 16 and 100/ha) three days before the release of a radiocollared weasel. During the three-day experiment every vole killed was replaced with another one as soon as possible to retain constant prey density. The results demonstrated type II functional response with the predation rate reaching 50% of the asymptotic rate at a vole density of 15 individuals per ha. More voles were killed at the highest densities than would be expected from the known energy demands of weasels. Female and male voles were killed in proportion to their abundances in the enclosures, and no difference in predation risk was detected between voles released in the enclosure before the weasel (residents) and during the experiment (transients).
We investigated the functional response of the least weasel (Mustela nivalis nivalis) in a series of experiments conducted in large outdoor enclosures (0.5 ha). Radiocollared Micotus voles were released in the enclosures at different densities (4, 8, 16 and 100/ha) three days before the release of a radiocollared weasel. During the three-day experiment every vole killed was replaced with another one as soon as possible to retain constant prey density. The results demonstrated type II functional response with the predation rate reaching 50% of the asymptotic rate at a vole density of 15 individuals per ha. More voles were killed at the highest densities than would be expected from the known energy demands of weasels. Female and male voles were killed in proportion to their abundances in the enclosures, and no difference in predation risk was detected between voles released in the enclosure before the weasel (residents) and during the experiment (transients).
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