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• W2144610219 abstract "This thesis examines the relative influences of domestic stock, rabbits and nativevertebrate herbivores on alpine and treeless subalpine vegetation on the Eastern CentralPlateau Tasmania, with special reference to tall alpine herbs.Results from 25 year old grazing exclosures on Liawenee Moor indicated that domesticstock had a much greater impact on the vegetation than rabbits and native vertebrateherbivores. Vegetation cover was greatest and structure was most complex in theungrazed exclosure, whilst vegetation cover was least in the sheep, rabbit and marsupialgrazed control area. Aerial photographic analysis showed that, over a 19 year period,regeneration in these exclosures was most successful in the ungrazed exclosure, whilstbare ground increased in the sheep grazed area.Most plant species that were present in the grazing exclosures were also present insheep grazed areas. However, sheep grazing had a dramatic impact on floweringsuccess of many tall alpine herbs, with significantly more herbs flowering in the rabbitand native vertebrate herbivore grazed plot and the ungrazed exclosure than the sheepgrazed area. A few tall herbs were tolerant of grazing by rabbits and native herbivoresas there was no significant difference in flowering success between the two exclosures(the ungrazed exclosure and the rabbit plus native herbivore grazed exclosure). Vegetation cover in 23 year old plots at Liawenee and Augusta tended to increase atapproximately 1% per year, whether grazed by domestic stock (Liawenee) or not(Augusta). Regeneration at Liawenee was dominated by shrubs and grasses. Shrubswere the most important recolonisers of bare ground at Augusta. Regeneration occurredat a slightly faster pace at Augusta, despite its higher altitude.At other sites, where domestic stock grazing ceased 6 years before the studycommenced, the average annual increment in vegetation cover was also approximately1%. The greatest increase in vegetation cover was found in the ungrazed exclosures,followed by the rabbit grazed exclosures, whilst the rabbit plus native vertebrateherbivore grazed controls had the lowest increase in vegetation cover. Flowering success at these sites was greater for some tall herb species in the ungrazedexclosures, but differences were less marked than at Liawenee. There were very fewdifferences in flowering success between rabbit grazed exclosures and those areas thatwere open to rabbits and native vertebrate herbivores, indicating that rabbits may have alarger impact on flowering success than native herbivores.Naturally ungrazed areas, small islands in a fast flowing stream, were dominated by tallalpine herbs and palatable grasses, which were non-existent or sparse on the nativevertebrate herbivore grazed banks. Tall herbs were dominant on the upstream ends ofthese islands, which experienced physical disturbance from fluctuating stream levels.These islands had very little bare ground other than that created by stream erosion.A major implication of this study is that the continuation of domestic stock grazing intreeless subalpine environments will contribute significantly to the deterioration of thelandscape through a decrease in vegetation cover in exposed sites, a reduction in thestructural diversity of the vegetation, a loss or reduction of some palatable plant species(mainly tall alpine herbs), the reduction of flowering of some tall herbs, and themaintenance of bare ground patches. Sheep plus rabbits and marsupial grazers have amuch greater impact than rabbits and natives alone. Rabbits in their present numbers,may be considered to be an additive effect to native vertebrate herbivore grazing asrecovery is slower under combined grazing (rabbits and native vertebrate herbivores)than under rabbit grazing alone. Rabbit grazing substantially affects the floweringsuccess of some tall herb species. It is estimated that most of the Eastern Central Plateau will regenerate naturally within50-80 years. Tall herbs are more prevalent where bare ground is less than 20%, but arenot the dominant lifeform in areas that are grazed. Tall herbs may dominate in naturallyungrazed environments (islands) but only where physical disturbance of the ground hasoccurred." @default.
• W2144610219 created "2016-06-24" @default.
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• W2144610219 date "2000-01-01" @default.
• W2144610219 modified "2023-09-26" @default.
• W2144610219 title "The effects of vertebrate herbivore grazing on the alpine vegetation of the Eastern Central Plateau, Tasmania" @default.
• W2144610219 hasPublicationYear "2000" @default.
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