Vis enkel innførsel

dc.contributor.authorMilner, Jos M.
dc.contributor.authorNilsen, Erlend Birkeland
dc.contributor.authorAndreassen, Harry Peter
dc.date.accessioned2009-12-15T13:07:46Z
dc.date.issued2007
dc.identifier.citationMilner, J., Nilsen, E., Andreassen, H. (2007) Demographic side effects of selective hunting in ungulates and carnivores. Conservation Biology, 21(1), 36-47
dc.identifier.otherdoi: 10.1111/j.1523-1739.2006.00591.x
dc.identifier.urihttp://hdl.handle.net/11250/134170
dc.description.abstractSelective harvesting regimes are often implemented because age and sex classes contribute differently to population dynamics and hunters show preferences associated with body size and trophy value. We reviewed the literature on how such cropping regimes affect the demography of the remaining population (here termed demographic side effects ). First, we examined the implications of removing a large proportion of a specific age or sex class. Such harvesting strategies often bias the population sex ratio toward females and reduce the mean age of males, which may consequently delay birth dates, reduce birth synchrony, delay body mass development, and alter offspring sex ratios. Second, we reviewed the side effects associated with the selective removal of relatively few specific individuals, often large trophy males. Such selective harvesting can destabilize social structures and the dominance hierarchy and may cause loss of social knowledge, sexually selected infanticide, habitat changes among reproductive females, and changes in offspring sex ratio. A common feature of many of the reported mechanisms is that they ultimately depress recruitment and in some extreme cases even cause total reproductive collapse. These effects could act additively and destabilize the dynamics of populations, thus having a stronger effect on population growth rate than first anticipated. Although more experimental than observational studies reported demographic side effects, we argue that this may reflect the quite subtle mechanisms involved, which are unlikely to be detected in observational studies without rigorous monitoring regimes. We call for more detailed studies of hunted populations with marked individuals that address how the expression of these effects varies across mating systems, habitats, and with population density. Theoretical models investigating how strongly these effects influence population growth rates are also required.en
dc.format.extent600926 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoengen
dc.publisherBlackwellen
dc.subjecthovdyren
dc.subjectjakten
dc.subjectkjøttetereen
dc.subjectselektiv jakten
dc.subjectstorvilten
dc.subjectpopulasjonsdynamikken
dc.subjecttroféjakten
dc.titleDemographic side effects of selective hunting in ungulates and carnivoresen
dc.typePeer revieweden
dc.typeJournal article
dc.subject.nsiVDP::Mathematics and natural science: 400::Zoology and botany: 480::Zoogeography: 486en
dc.source.pagenumber36-47en
dc.source.volume21en
dc.source.journalConservation Biologyen
dc.source.issue1en


Tilhørende fil(er)

Thumbnail

Denne innførselen finnes i følgende samling(er)

Vis enkel innførsel