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dc.contributor.authorRosell, Frank
dc.contributor.authorParker, Howard
dc.contributor.authorSteifetten, Øyvind
dc.date.accessioned2009-01-30T14:05:03Z
dc.date.accessioned2017-04-19T12:24:16Z
dc.date.available2009-01-30T14:05:03Z
dc.date.available2017-04-19T12:24:16Z
dc.date.issued2006
dc.identifier.citationActa theriologica 51(2006) No. 1, p. 107-112
dc.identifier.issn0001-7051
dc.identifier.urihttp://hdl.handle.net/11250/2437919
dc.description.abstractThe methods used to determine family composition and colony size in Eurasian beaver Castor fiber Linnaeus, 1758 are often poorly described in published reports. Here we show how repeated counts of colony size in a random sample of colonies (n = 19) varied between dusk and dawn, between the months of August and September, and following successive counts. Mean counts at dusk and the following dawn did not vary significantly, though mean colony size was significantly greater in August than September. However, because all colony members are rarely seen during a single dusk or dawn count, successive counts often provided new information about the maximum number in each age class. This allowed us to adjust colony size following each count using the largest values thus far obtained, with the result that the mean adjusted colony size increased during six successive counts over seven weeks from 2.4 to 3.8. Family composition based on information from all six counts was 54% adults, 26% yearlings and 19% kits. Evidence suggests that kits in particular are undercounted by this method. Figures for colony size and composition in beaver should be viewed with caution if not obtained by methods tested for both precision and accuracy.
dc.language.isoeng
dc.publisherPolish academy of sciences, Mammal research institute
dc.relation.urihttp://acta.zbs.bialowieza.pl/contents/?art=2006-051-1-0107
dc.subjectBeavers
dc.subjectPopulation estimation
dc.subjectColony size
dc.subjectManagement
dc.subjectMonogamy
dc.titleUse of dawn and dusk sight observations to determine colony size and family composition in Eurasian beaver Castor fiber
dc.typeJournal article
dc.typePeer reviewed
dc.subject.nsi485


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