[ASC-list] Free ANZAAS science talk, Melbourne, Wednesday 16th September, 6:30pm

David Vaux D.Vaux at latrobe.edu.au
Sun Sep 6 22:09:09 UTC 2009

ANZAAS Vic Science Talk, Free, all welcome (booking not needed)
Free pizza and drinks after the talk

At: Gene Technology Access Centre (GTAC), in the grounds of University High
School, 1H Royal Parade Parkville, off Story Street

Wednesday 16th September 2009, at 6:30 pm

Professor Pauline Ladiges

Head, School of Botany, Melbourne University

"Eucalypts in time and space  - evolution and biogeography"
DNA sequences are revealing the phylogeny and history of the eucalypts
(family Myrtaceae).  The eucalypt group includes seven genera, of which some
are rainforest taxa of restricted distribution and others are species-rich
and widespread in drier environments. The phylogeny shows that Arillastrum
gummiferum, a rainforest species endemic to New Caledonia, is the closest
relative of the Australian eucalypts.  Given that New Caledonia rifted from
eastern Australia (part of Gondwana) more than 60 million years ago and that
50 million-year-old eucalypt fossils have been found recently in South
America, it is argued that the eucalypts are an ancient element of the
Australian flora.

Within the large genus Eucalyptus, subgenus Eucalyptus (commonly called the
Œmonocalypts¹) is a distinctive subgroup of 106 species, including some of
Australia¹s most important timber trees, such as E. marginata (jarrah) and
E. regnans (mountain ash).  This subgenus is distributed in both western and
eastern Australia, ranging from tropical to cool temperate latitudes, and is
most common in southern coastal and upland regions. The phylogeny of the
subgenus reveals a deep divergence across southern Australia,  isolating
species groups within the south-west bioregion from species in eastern
Australia.  This biogeographic pattern is congruent with other plant and
animal east-west relationships, and points to major events of marine
inundation and climate change (dating from 40 million years ago) responsible
for the differentiation of the southern flora and fauna.

Use the Royal Melbourne Hospital tram stop in Royal Parade. Parking
available at RMH, University of Melbourne, and designated places in Park
Drive, Royal Parade & Story Street

***We are pleased to acknowledge the support by GTAC, CSL and La Trobe
University University for the ANZAAS Melbourne science talks series***

Further Info:
Peter Kemeny:  Tel: 0409 028 165
               email peter.kemenyATgmail.com



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