Hide metadata

dc.date.accessioned2013-03-12T08:42:24Z
dc.date.available2013-03-12T08:42:24Z
dc.date.issued2006en_US
dc.date.submitted2006-08-28en_US
dc.identifier.citationAaserud, Ragnar Mathias. The effect off sheep grazing on beetles and spiders in alpine ecosystem. Masteroppgave, University of Oslo, 2006en_US
dc.identifier.urihttp://hdl.handle.net/10852/11643
dc.description.abstractInvertebrate community responses to grazing were studied within a fully replicated,landscape scale experiment where densities of domestic sheep were manipulated in alpine ecosystems in Hol, Norway. I determined species richness and abundance of beetles and spiders with pitfall trapping in each of the enclosures with three different levels of sheep densities (no, low and high). Strong effects of sheep grazing on the species richness and abundance of beetles were found. Species richness was lower at high density of sheep compared to treatments with low density or no sheep. There was however no difference in species richness between enclosures with low density or no sheep present. The abundance of both of the two most common herbivore beetles was negatively affected by grazing. Byrrhus fasciatus (Byrrhidae) was negatively affected even at low densities of sheep. Only Patrobus assimilis (Carabidae) of the three predatory beetles were reduced in abundance due to grazing and then only at high sheep density. The abundance of the other two predator beetles species as well as the spider community, which are also predators, were not affected by sheep grazing to the same extent. The insight obtained from this study is thus that sheep grazing is affecting the invertebrate community, but that effects differ between different functional groups, being stronger for herbivores than predators. Although this is based on analyses of a limited number of species, it may suggest that the effect of sheep grazing diminishes further up the food chain.nor
dc.language.isoengen_US
dc.subjectøkologi evolusjonssyntese biller edderkopper beiting fjellandskapen_US
dc.titleThe effect off sheep grazing on beetles and spiders in alpine ecosystemen_US
dc.typeMaster thesisen_US
dc.date.updated2007-01-09en_US
dc.creator.authorAaserud, Ragnar Mathiasen_US
dc.subject.nsiVDP::480en_US
dc.identifier.bibliographiccitationinfo:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft.au=Aaserud, Ragnar Mathias&rft.title=The effect off sheep grazing on beetles and spiders in alpine ecosystem&rft.inst=University of Oslo&rft.date=2006&rft.degree=Masteroppgaveen_US
dc.identifier.urnURN:NBN:no-14007en_US
dc.type.documentMasteroppgaveen_US
dc.identifier.duo43767en_US
dc.contributor.supervisorAtle Mysteruden_US
dc.identifier.bibsys070029083en_US
dc.identifier.fulltextFulltext https://www.duo.uio.no/bitstream/handle/10852/11643/1/Theeffectsofsheep.pdf


Files in this item

Appears in the following Collection

Hide metadata