Range extension of Leadbeater's possum (Gymnobelideus leadbeateri)

2020 ◽  
Vol 42 (1) ◽  
pp. 96 ◽  
Author(s):  
Timothy C. McBride ◽  
Aaron Organ ◽  
Elizabeth Pryde
Keyword(s):  
Tree Species ◽  
Camera Trap ◽  
Range Extension ◽  
Mixed Species ◽  
Eucalyptus Regnans ◽  
In Fire ◽  
Stage Composition ◽  
Leadbeater's Possum ◽  
Mixed Species Forest

We report spotlight and camera-trap observations of Leadbeater’s possum (Gymnobelideus leadbeateri) at six locations up to 15km east of its described range. Half of our records occurred in fire-affected, mixed-species forest, with a tree species and seral stage composition that differs markedly from its predominant habitat: late-mature forests dominated by Eucalyptus regnans, E. delegatensis and E. nitens.

scholarly journals Correction to: Silvicultural prescriptions for mixed-species forest stands. A European review and perspective

2021 ◽  
Author(s):  
Hans Pretzsch ◽  
Werner Poschenrieder ◽  
Enno Uhl ◽  
Gediminas Brazaitis ◽  
Ekaterina Makrickiene ◽  
...  
Keyword(s):  
Forest Stands ◽  
Mixed Species ◽  
European Review ◽  
Silvicultural Prescriptions ◽  
Mixed Species Forest

scholarly journals The potential of mixing timber assets to financially offset negative effects of deer browsing on western redcedar

2015 ◽  
Vol 91 (04) ◽  
pp. 436-443 ◽  
Author(s):  
Verena C. Griess ◽  
Rajat Panwar ◽  
Julie Cool
Keyword(s):  
Western Hemlock ◽  
Investment Risk ◽  
Financial Indicators ◽  
Negative Effects ◽  
Mixed Species ◽  
Financial Return ◽  
Protective Measures ◽  
Western Redcedar ◽  
Risk Return ◽  
Mixed Species Forest

Western redcedar (WRC) is a highly desirable species in British Columbia's Coastal Western Hemlock zone, both from a management and a conservation perspective. However, it is also highly palatable for ungulates. Existing countermeasures against browsing all have high costs and imperfect results in common. We used the portfolio method to display how diversification can help to lower investment risk. Using risk-return ratios of a WRC and Douglas-fir (DF), we derived species portfolios that yield maximum financial return per unit of risk. Financial indicators were calculated based on Monte Carlo simulations, which consider timber price fluctuation and browsing risk. Results show how economic risks of a forest investment could be reduced by creating a species portfolio. The optimum portfolio leading to most beneficial risk-return combination is 75% WRC and 25% DF if browsing is lowered using protective measures that double planting costs; and 30% WRC and 70% DF if no protective measures are applied. Accordingly, the most desirable risk-return combination is that of a mixed-species forest, whereas the 2 species don't have to be grown in intimate mixtures. Our research sketches a path forward that can help to ensure WRC will remain an important asset in BC's timber portfolio.

Five year results from a mixed-species spacing trial with six subtropical rainforest tree species

2006 ◽  
Vol 233 (2-3) ◽  
pp. 309-314 ◽  
Author(s):  
John C. Grant ◽  
J. Doland Nichols ◽  
Marie-Chantale Pelletier ◽  
Kevin Glencross ◽  
Robyn Bell
Keyword(s):  
Tree Species ◽  
Mixed Species

Economics of a nest-box program for the conservation of an endangered species: a reappraisal

2001 ◽  
Vol 31 (11) ◽  
pp. 1992-2003 ◽  
Author(s):  
Daniel A Spring ◽  
Michael Bevers ◽  
John OS Kennedy ◽  
Dan Harley
Keyword(s):  
Net Present Value ◽  
Population Recovery ◽  
Optimal Management ◽  
Present Value ◽  
Eucalyptus Regnans ◽  
Nest Boxes ◽  
Mountain Ash ◽  
Local Abundance ◽  
Leadbeater's Possum

An optimization model is developed to identify timing and placement strategies for the installation of nest boxes and the harvesting of timber to meet joint timber–wildlife objectives. Optimal management regimes are determined on the basis of their impacts on the local abundance of a threatened species and net present value (NPV) and are identified for a range of NPV levels to identify production possibility frontiers for abundance and NPV. We apply the model to a case study focusing on an area of commercially productive mountain ash (Eucalyptus regnans F. Muell.) forest in the Central Highlands region of Victoria, Australia. The species to be conserved is Leadbeater's possum (Gymnobelideus leadbeateri McCoy), which is locally limited by a scarcity of nesting hollows. The modeling is exploratory but indicates that nest boxes may offer a promising population recovery tool if consideration is taken of their placement and areal extent through time.

scholarly journals Positive biodiversity–productivity relationships in forests: climate matters

2018 ◽  
Vol 14 (4) ◽  
pp. 20170747 ◽  
Author(s):  
H. Jactel ◽  
E. S. Gritti ◽  
L. Drössler ◽  
D. I. Forrester ◽  
W. L. Mason ◽  
...  
Keyword(s):  
Climate Change ◽  
Carbon Sequestration ◽  
Tree Species ◽  
Climatic Factors ◽  
Meta Analysis ◽  
Global Scale ◽  
Tree Age ◽  
Drought Severity ◽  
Natural Forests ◽  
Mixed Species

While it is widely acknowledged that forest biodiversity contributes to climate change mitigation through improved carbon sequestration, conversely how climate affects tree species diversity–forest productivity relationships is still poorly understood. We combined the results of long-term experiments where forest mixtures and corresponding monocultures were compared on the same site to estimate the yield of mixed-species stands at a global scale, and its response to climatic factors. We found positive mixture effects on productivity using a meta-analysis of 126 case studies established at 60 sites spread across five continents. Overall, the productivity of mixed-species forests was 15% greater than the average of their component monocultures, and not statistically lower than the productivity of the best component monoculture. Productivity gains in mixed-species stands were not affected by tree age or stand species composition but significantly increased with local precipitation. The results should guide better use of tree species combinations in managed forests and suggest that increased drought severity under climate change might reduce the atmospheric carbon sequestration capacity of natural forests.

Tree Hollow Requirements of Leadbeater's Possum and Other Possums and Gliders in Timber Production Ash Forests of the Victorian Central Highlands.

1988 ◽  
Vol 15 (4) ◽  
pp. 347 ◽  
Author(s):  
AP Smith ◽  
D Lindenmayer
Keyword(s):  
Forest Management ◽  
Regression Models ◽  
Timber Production ◽  
Total Density ◽  
Management Options ◽  
Eucalyptus Regnans ◽  
Dead Trees ◽  
Production Forests ◽  
Leadbeater's Possum ◽  
Tree Hollow

A model is presented of relationships between the density of Leadbeater's possum (Gymnobelideus leadbeateri) and other tree-hollow dependent possums and gliders and the density of potential nest trees (PNT) in Eucalyptus regnans/E. delegatensis forests, where PNT are defined as all living or dead trees with d.b.h. more than or equal to 0.5 m and ht. more than or equal to 6 m. The total density of all possums and gliders increased linearly with PNT density, in an approx. 1:1 ratio, then plateaued at an av. max. density of 11.3 animals per 3 ha once PNT density exceeded 12 per 3 ha. Regression models predict that G. leadbeateri will be absent from the majority of sites with less than 4.2 PNT per 3 ha and will increase linearly in density to an av. max. of 7.8 animals (or 3.1 colonies) per 3 ha on sites with more than 10 PNT per 3 ha. The absence of G. leadbeateri from sites with fewer than 4.2 PNT per 3 ha was attributed to: competition for hollows from other species; use of more than one PNT by individual colonies; and unsuitability of hollows in up to 2 out of every 3 PNT. Regression models predict that current logging prescriptions in ash forests, which call for retention of a minimum of 15 trees for every 10 ha clear felled, will result in elimination of G. leadbeateri from the majority of clearfelled coupes, and will reduce the total number of hollow-dependent possums and gliders to less than one-eighth of their av. max. density in unlogged forest. A range of forest management options are presented and discussed to ensure the continued availability of PNT for hollow-dependent arboreal mammals in timber production forests.

scholarly journals Over- and Underyielding in Time and Space in Experiments with Mixed Stands of Scots Pine and Norway Spruce

Forests ◽  
2018 ◽  
Vol 9 (8) ◽  
pp. 495 ◽  
Author(s):  
Lars Drössler ◽  
Eric Agestam ◽  
Kamil Bielak ◽  
Małgorzata Dudzinska ◽  
Julia Koricheva ◽  
...  
Keyword(s):  
Norway Spruce ◽  
Scots Pine ◽  
Tree Species ◽  
Mixed Forest ◽  
Stand Age ◽  
Mixed Species ◽  
Mixed Stands ◽  
Mixing Effect ◽  
Individual Site ◽  
Study Sites

Pine-spruce forests are one of the commonest mixed forest types in Europe and both tree species are very important for wood supply. This study summarized nine European studies with Scots pine and Norway spruce where a mixed-species stand and both monocultures were located in an experimental set-up. Overyielding (where growth of a mixed stand was greater than the average of both monocultures) was relatively common and often ranged between 0% and 30%, but could also be negative at individual study sites. Each individual site demonstrated consistent patterns of the mixing effect over different measurement periods. Transgressive overyielding (where the mixed-species stand was more productive than either of the monocultures) was found at three study sites, while a monoculture was more productive on the other sites. Large variation between study sites indicated that the existing experiments do not fully represent the extensive region where this mixed pine-spruce forest can occur. Pooled increment data displayed a negative influence of latitude and stand age on the mixing effect of those tree species in forests younger than 70 years.

Sign in / Sign up

Export Citation Format

Share Document