[Mastwatch] Shorea albida

Ashton, Peter pashton at oeb.harvard.edu
Thu Mar 27 03:41:40 PDT 2014


I wonder what proportion will be found to occur in kerangas streams as well. But you are right and, as Bob Morley related, peat swamp communities occur at least in SE Sunda early in the Miocene, quite long enough for tree speciation.



Peter

________________________________
From: mastwatch-bounces at lists.phylodiversity.net [mastwatch-bounces at lists.phylodiversity.net] on behalf of Ferry Slik [ferryslik at hotmail.com]
Sent: Wednesday, March 26, 2014 7:48 PM
To: Chuck Cannon; mastwatch at lists.phylodiversity.net
Subject: Re: [Mastwatch] Shorea albida

I saw a talk about peat swamp fish when I was at the Asian Biogeography meeting in Berlin last year, that also suggests that the peats have been around for a considerable time.... So they must have been moving around the Sunda Shelf, probably following the historical sea levels and with large expanses in central Sundaland during glacial maxima....

Ferry Slik
Associate Professor
Faculty of Science
Universiti Brunei Darussalam,
Jln Tungku Link, Gadong, BE1410, Brunei Darussalam.

Website
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Plants of Southeast Asia
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________________________________
Date: Wed, 26 Mar 2014 09:23:36 -0500
From: chuck.cannon at gmail.com
To: mastwatch at lists.phylodiversity.net
Subject: Re: [Mastwatch] Shorea albida

Hi Peter,

In thinking about these peats, it's imporatnt to include their historical geography.  For much of the last ice age, there was probably a large unified (?) peat in central Sundaland, possibly much larger and certainly slightly cooler than today.

I've always been amazed that such a small forest type, that is often highly fragmented naturally, could produce such high biodiversity that was also highly specialized.  In extreme environments, you typically get a few species that strongly dominate the community because of clear and pervasive selection pressures.  perhaps the conditions are not as extreme as all of that either but there does seem to be a strong environmental filter.

The fact that the area was probably substantially larger in the past would partially answer that question.

All the best,
Chuck

On 03/25/2014 04:58 AM, Ashton, Peter wrote:
Hi ewverybody,

All interesting, including Colin (Maycock?) at Danum who says there has been little drought up there to date, - out of kilter with Sunda further west as so often. But there is another potentially intriguing aspect of this issue which UBD sleuths can get on to, and for which I have brought Ian Baillie in as he has had an interest in the coastal climate of NW Borneo: Primary seringawan forest should evapotranspire roughly as much vapour as the sea surface, so where is the climatic coastline, on the true sea front or at the back of swamps where extensive? Of course coastal development, and conversion to oil palm down the coast, wil laffect this. But, if the climatic coastline is at the back of the swamp, that might explain why swamps flower at different times from inland forests.

And Joe (it is always good to hear from you!), what has happened to what was left of Andulau, by far the most important forest for conservation from a tree species endemism perspective (and probably a lot more, such as soil fauna and flora, and arthropods, besides)?

Peter


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