The Dynamics of Callitris columellaris/Eucalyptus albens Communities Along the Snowy River and Its Tributaries in South-Eastern Australia

Clayton-Greene, K. A.; Ashton, D. H.

doi:10.1071/bt9900403

Cited by 29 publications

(22 citation statements)

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“…Previous studies on other eucalypt species have employed a variety of techniques to measure rates of seed predation. They have shown that between 33% and 100% of seeds are removed by invertebrate predators within a matter of days (Withers 1978; Ashton 1979; Drake 1981; Andersen 1982; Andersen & Ashton 1985; Wellington & Noble 1985; Clayton‐Greene & Ashton 1990; Yates et al . 1995).…”

Section: Discussionmentioning

confidence: 99%

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The effects of flooding and livestock on post‐dispersal seed predation in river red gum habitats

Meeson¹,

Robertson²,

Jansen³

2002

Journal of Applied Ecology

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Summary 1.Rates of seed predation are influenced by conditions that alter seed supply and the activity of seed predators. In southern Australia the potential seed supply for the dominant floodplain tree species, the river red gum Eucalyptus camaldulensis, has been reduced through forest clearing to support grazing by introduced livestock. River regulation and water extraction have reduced the frequency of flooding and thus the conditions that promote seed germination on floodplains. To determine if poor recruitment of river red gums could be caused by low seed supply, as a result of postdispersal seed predation, we used field experiments and observations to investigate how post-dispersal predation on seeds of E. camaldulensis was affected by flooding, livestock management and their interaction. 2. Seed predation was measured before and after different flood treatments (0·5 m depth; short flood of 24 h, long flood of 30 days). Flooding of this kind (return frequency of once per year) did not have any significant effect on rates of seed removal by seed predators. 3. Rates of seed predation in floodplain habitats under widespread livestock management regimes changed seasonally. In all seasons seed predation was lowest at sites grazed by sheep. In winter seed predation was highest at ungrazed sites. In spring and summer seed predation was highest at sites grazed by cattle. Ant communities differed between forested and cleared habitats and seed-eating ant species were most abundant in cleared sites grazed by cattle. 4. Rates of seed predation in forested floodplain sites with different flood histories differed among sites with different livestock management histories. The impact of cattle exclusion on seed predation rates increased as the period since flooding increased. 5. Cattle grazing is widespread on the floodplains of rivers across the southern MurrayDarling Basin, and tree densities and hence seed supplies are low. In this situation small floods may not result in significant recruitment to river red gum populations because seed predation may reduce seed supply before and following flooding. Decreases in the frequency of flooding owing to river regulation and water extraction are likely to have exacerbated the influence of livestock on seed supply and thus reduced potential recruitment even further. 6. Efforts to rehabilitate large floodplain rivers based solely on the return of more natural flow regimes may fail if the effects of factors such as livestock grazing are not managed concurrently.

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Section: Discussionmentioning

confidence: 99%

“…Large numbers of Pheidole spp. worker ants forage specific areas and can remove many seeds very rapidly (Briese & Macauley 1981; Clayton‐Greene & Ashton 1990; Shattuck 1999). The pattern of seed disappearance observed in our study corresponded to the foraging behaviour of some seed‐eating ants.…”

Section: Discussionmentioning

confidence: 99%

The effects of flooding and livestock on post‐dispersal seed predation in river red gum habitats

Meeson¹,

Robertson²,

Jansen³

2002

Journal of Applied Ecology

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“…This is consistent with C. sulcata being a light demanding species that can tolerate moderate shade in the juvenile stage (Jaffré, 1995). Frequent recruitment has also been demonstrated for several Australian Callitris species growing in the absence of major disturbance (Clayton-Greene and Ashton, 1990;Harris and Kirkpatrick, 1991;Bowman et al, 1988;Prior et al, 2011). By contrast, there was a clear deficit of live small trees in the recently burnt plots.…”

Section: Stand Structure and Fire Impactmentioning

confidence: 86%

Effect of landscape fires on the demography of the endangered New Caledonian conifer Callitris sulcata

Haverkamp

Prior

Fogliani

et al. 2015

Biological Conservation

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“…A common perception among the public, which has been expressed anecdotally in the literature, is that dense C. glaucophylla regrowth suppresses the growth and cover of ground-storey plants (Boland et al 1984;Clayton Greene and Ashton 1990;Nowland 1997;Andrews 2003;Harris et al 2003). The results of this study lend support to such observations--at each site vegetative cover was lowest in dense plots (dense C. glaucophylla regrowth), despite heavy grazing in the un-colonised plots of some sites.…”

Section: Discussionmentioning

confidence: 99%

Soil and vegetation response to thinning White Cypress Pine (Callitris glaucophylla) on the North Western Slopes of New South Wales, Australia

McHenry

Wilson

Lemon³

et al. 2006

Plant Soil

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Dense White Cypress Pine (Callitris glaucophylla J. Thompson and L.A.S. Johnson) regrowth occurs frequently across previously cleared landscapes in New South Wales (NSW), and is thought to adversely affect agricultural production and to cause land degradation. The NSW Native Vegetation Act (2003) requires that management of native vegetation including pre-1990 regrowth must 'improve or maintain' site condition, yet there is currently limited information regarding techniques for the optimum management of C. glaucophylla in this regard. We conducted a preliminary study to examine floristic composition, soil condition (to 50 cm) and carbon storage under 'Dense' (dense regrowth), 'Thinned' (dense regrowth thinned 2000/2001) and 'Un-colonised' (pasture not yet recolonised by C. glaucophylla) plots on private lands in NSW. Reduced tree density from thinning resulted in increased biomass of the remaining individual trees. Un-colonised plots had significantly more groundcover than thinned plots, which had significantly more groundcover than dense plots. Differences in plant diversity however, were explained by site factors rather than land use. Soils in the dense plots were the most acid but soil pH was significantly higher in thinned plots and pH was highest in soil of the un-colonised plots. Mean values for carbon, nitrogen, sulphur and extractable phosphorus varied among sites, although each were significantly more abundant in the mineral soil of dense and thinned plots compared with un-colonised plots, suggesting that thinning had had a minimal effect on the soil parameters assessed. Accounting for all site components, site carbon storage was significantly higher in dense and thinned plots compared with un-colonised plots due to elevated levels of soil and litter carbon as well as the presence of trees. The results indicate that thinning dense C. glaucophylla can maintain and (by some measures) improve site condition. However, given the variability in some of the parameters assessed, further study across a wider range of soil types and rainfall gradients is proposed.

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The Dynamics of Callitris columellaris/Eucalyptus albens Communities Along the Snowy River and Its Tributaries in South-Eastern Australia

Cited by 29 publications

References 0 publications

The effects of flooding and livestock on post‐dispersal seed predation in river red gum habitats

The effects of flooding and livestock on post‐dispersal seed predation in river red gum habitats

Effect of landscape fires on the demography of the endangered New Caledonian conifer Callitris sulcata

Soil and vegetation response to thinning White Cypress Pine (Callitris glaucophylla) on the North Western Slopes of New South Wales, Australia

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