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- W89027712 abstract "This thesis investigates disturbances created by the digging of smallnative mammals and their role in the germination and establishment of nativeplant species in eastern Tasmania, with a particular focus on species consideredto be rare or threatened. At least 15 rare and endangered plant species live inhabitats where digging appears to be common. Soil disturbances, which arecreated by bettongs, bandicoots and echidnas, can be prolific, particularly onsoils of lower fertility. Turnover rates of up to 2.9% of the ground surface perannum were recorded. Diggings by bettongs, and to a lesser degree bybandicoots, are spatially associated with trees in dry sclerophyll and grassywoodlands and forests. The understorey varies in species compositiondepending on the degree of tree influence, so not all understorey species areclose (at the scale of several metres) to where digging disturbances are mostabundant.Digging creates small patches of bare ground which, on sandy soils,can be a harsh environment with low nutrient and moisture availability.However, diggings provide better conditions for the germination of manyspecies, particularly those with small seeds and perhaps also some specieswhich have hard-seeded dormancy. This latter effect may be a result of theconsiderable soil heating imposed by direct solar radiation on bare soil. Severalspecies had higher densities of seedlings on animal diggings, althoughmortality rates were generally very high on both digging disturbances andundisturbed areas. Seedlings died faster, at the same rate, or slower on diggingscompared with undisturbed areas, depending on the species and thecircumstances. Simulated animal disturbances proved to be effective instimulating germination, and more substantial survival of seedlings wasrecorded in these experiments than on natural diggings.Many plant species in this study have seed stored in the soil at depth.Digging probably brings buried seed to the surface which would otherwisenot germinate.Rare or threatened species which were found to benefit from eithernatural diggings or simulated disturbances included Lepidium hyssopifolium, L. peudotasman icum, L1siopetalum micranthum, Vittadinia muelleri and Velleiaparadoxa. No rare species appeared to be completely dependent on animaldigging for a regeneration niche, but the potential exists to use mechanicaldisturbance as a management tool for some species.The density of an exotic annual grass, Briza maxima, was considerablyless on larger digging mounds compared with undisturbed areas, even threeyears after the creation of the mounds. There was evidence that native seedlingswere experiencing less competition from B. maxima on these mounds andperhaps have a better opportunity for establishment." @default.
- W89027712 created "2016-06-24" @default.
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- W89027712 date "1994-01-01" @default.
- W89027712 modified "2023-09-27" @default.
- W89027712 title "Soil disturbance by native mammalsand the germination and establishmentof plant species" @default.
- W89027712 hasPublicationYear "1994" @default.
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