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Relative importance of tree genetics and microhabitat on macrofungal biodiversity on coarse woody debris


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Barbour, RC, Storer, MJ and Potts, BM 2009 , 'Relative importance of tree genetics and microhabitat on macrofungal biodiversity on coarse woody debris' , Oecologia, vol. 160, no. 2 , pp. 335-342 , doi: 10.1007/s00442-009-1295-z.

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Understanding the contribution of genetic variation
within foundation species to community-level pattern
and diversity represents the cornerstone of the developing
Weld of community genetics. We assessed the relative
importance of intraspeciWc genetic variation, spatial variation
within a forest and microhabitat variation on a macrofungal
decay community developing on logs of the
Australian forest tree, Eucalyptus globulus. Uniform logs
were harvested from trees from eight geographic races of E.
globulus growing in a 15-year-old genetic trial. Logs were
placed as designed grids within a native E. globulus forest
and after 3 years of natural colonisation the presence of 62
macrofungal taxa were recorded from eight microhabitats
on each log. The key factor found to drive macrofungal distribution
and biodiversity on structurally uniform coarse
woody debris was log-microhabitat, explaining 42% of the
total variation in richness. DiVerences between log-microhabitats
appeared to be due to variation in aspect, substrate
(bark vs wood) and area/time of exposure to colonisation.
This Wndings demonstrates the importance of considering
Wne-scale (within substrate) variation in the conservation
and management of macrofungal biodiversity, an area that
has received little previous attention. While a number of
recent studies have demonstrated that the genetics of foundation
tree species can inXuence dependent communities,
this was not found to be the case for the early log decay
community associated with E. globulus. Despite genetic
variation in wood and bark properties existing within this
species, there was no signiWcant eVect of tree genetics on
macrofungal community richness or composition. This
Wnding highlights the variation that may exist among guilds
of organisms in their response to genetic variation within
foundation species, an important consideration in a promising
new area of research.

Item Type: Article
Authors/Creators:Barbour, RC and Storer, MJ and Potts, BM
Keywords: Community genetics, Distal community phenotype, Microhabitat, Macrofungi, Coarse woody debris (CWD)
Journal or Publication Title: Oecologia
ISSN: 0029-8549
DOI / ID Number: 10.1007/s00442-009-1295-z
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