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Effects of twice-over rotation grazing on the relative abundances of grassland birds in the mixed-grass prairie region of southwestern Manitoba

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dc.contributor.supervisor Koper, Nicola (Natural Resources Institute) en
dc.contributor.author Ranellucci, Cristina lynn
dc.date.accessioned 2010-09-16T14:37:49Z
dc.date.available 2010-09-16T14:37:49Z
dc.date.issued 2010-09-16T14:37:49Z
dc.identifier.uri http://hdl.handle.net/1993/4202
dc.description.abstract The mixed-grass prairie region of southwestern Manitoba is a hotspot for many endangered grassland birds. This region has been degraded to less than a quarter of its historical amount of mixed-grass prairie. Remaining prairie is primarily used for livestock grazing. The objective of this study was to evaluate the contribution of sustainable land management practices, such as rotational grazing, in the conservation of this region. In 2008 and 2009, I compared the abundances of grassland birds on two grazing regimes, twice-over rotation and season-long, to ungrazed fields. Bird surveys were done during the breeding season and were conducted using 100-m fixed-radius point-count plots. I determined the effects of treatment, landscape and vegetation characteristics on songbird abundances using generalized linear mixed models. Grassland birds selected grazed pastures over ungrazed fields in both years, and species richness of obligate grassland birds was significantly greater (α = 0.10) on season-long than twice-over pastures (β = 0.419, p = 0.032, in 2008 and β = 0.502, p = 0.043 in 2009). Season-long grazing may actually benefit grassland bird communities by creating somewhat temporally stable areas of high use and low use within the pasture. However, nesting success studies and long-term monitoring are necessary to further understand how twice-over rotation grazing systems contribute to the conservation of grassland birds in southwestern Manitoba. en
dc.format.extent 1502142 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US
dc.rights info:eu-repo/semantics/openAccess
dc.subject twice-over en
dc.subject rotation en
dc.subject grazing en
dc.subject grasslands en
dc.subject songbirds en
dc.subject mixed-grass prairie en
dc.title Effects of twice-over rotation grazing on the relative abundances of grassland birds in the mixed-grass prairie region of southwestern Manitoba en
dc.type info:eu-repo/semantics/masterThesis
dc.degree.discipline Natural Resources Management en
dc.contributor.examiningcommittee Sealy, Spencer (Biological Sciences) Henderson, Darcy (Canadian Wildlife Services, Environment Canada) en
dc.degree.level Master of Natural Resources Management (M.N.R.M.) en
dc.description.note October 2010 en


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