The role of lesser snow geese in positive, degenerative feedback processes resulting in the destruction of salt-marsh swards.

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dc.contributor.authorSrivastava, Diane Sheila
dc.date.accessioned2012-11-14T07:00:56Z
dc.date.available2012-11-14T07:00:56Z
dc.date.issued1993
dc.degree.grantorUniversity of Toronto
dc.descriptionMasters Thesis completed in 1993 by D.S. Srivastava at the University of Toronto. Supervised by Dr. R.L. Jefferies.
dc.description.abstractA positive feedback cycle between soil salinity and graminoid growth, triggered by intensive grazing and grubbing by geese, is proposed to account for the loss of graminoid vegetation in an arctic salt marsh (La Pérouse Bay, Manitoba, Canada) based on the results of experimental field studies. Decreases in above-ground biomass, caused by goose herbivory, increase soil salinity. High soil salinities further reduce graminoid growth, both in the salt marsh and under controlled conditions, causing additional decreases in above-ground biomass. Graminoid growth is also reduced by intraspecific competition. The implications of this positive feedback on vegetation dynamics and the size of the goose colony at La Perouse Bay are discussed.en_US
dc.identifier.citationThesis (M.Sc.) - University of Toronto. D.S. Srivastava: Theses Canada, 1993. (AMICUS No. 21557550)
dc.identifier.urihttp://hdl.handle.net/10315/18774
dc.language.isoenen
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/2.5/ca/*
dc.subjectsoil salinity
dc.subjectgraminoid growth
dc.subjectgrazing
dc.subjectsalt marsh
dc.subjectManitoba
dc.subjectLa Pérouse Bay
dc.subjectabove-ground biomass
dc.subjectintraspecific competition
dc.subjectvegetation dynamics
dc.subjectpositive feedback
dc.subjectgrass
dc.subjectGraminoid
dc.titleThe role of lesser snow geese in positive, degenerative feedback processes resulting in the destruction of salt-marsh swards.
dc.typeElectronic Thesis or Dissertation

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