[Mastwatch] West Kal Mast

Tim Laman tim at timlaman.com
Thu Mar 28 05:46:07 PDT 2019


Greetings all,

To add my two cents, I think what Peter meant mainly is that any limited lateral movement from the parent tree by the winged fruit is disrupted by the canopy below so they won’t keep moving sideways.  I don’t think a very large percentage of fruits get stuck in the canopy.  Most fall to the ground, but they certainly don’t get far.  

For your enjoyment, here is a shot I took of the masting Shorea spp in the canopy in Gunung Palung in December with one of those very handy new-fangled drones.  While the Shorea fruits are positioned at the twig tips, you can see in the image that most will not get a “clean release” from their own tree crown, and will just tumble down to the ground beneath the tree.  But selection operates on rare events, right?  What about that big gust of wind that comes before thunderstorms?  Could that carry a few seeds from the top of the crown to some distance, and they survive better than the mass of seedlings beneath the tree?

Best,
Tim


> On Mar 28, 2019, at 7:43 AM, Lord Cranbrook <lordcranbrook at greatglemhamfarms.co.uk> wrote:
> 
> THere are always 1000's of seedlings around the base of parent trees, after a mast year. l don't think wind dispersal is very effective.
> Why are the wings so brightly coloured ?
> ln Sarawak engkebang fruits also float down the rivers
>   <>
> From: Mastwatch [mailto:mastwatch-bounces at lists.phylodiversity.net <mailto:mastwatch-bounces at lists.phylodiversity.net>] On Behalf Of Mikaail Kavanagh
> Sent: 28 March 2019 04:15
> To: Ashton, Peter; Wong Siew Te DJN; Andreas Carlson; mastwatch at lists.phylodiversity.net <mailto:mastwatch at lists.phylodiversity.net>
> Subject: Re: [Mastwatch] West Kal Mast
>  
> Hi Friends, 
>  
> Interesting point, Peter. I must confess to not knowing that so many of the winged fruit never make it to ground level.
>  
> Wong, the video that you circulated (thanks!) got me thinking about the relevance of the winged fruits in terms of evolutionary strategies for different sub-habitats and niches.  Presumably, there would be different selective pressures according to such differences?  In particular, has anyone looked at the wings' effect on floating - potentially for long distances - for such a riverside specialist as, for example, the Neram (Dipterocarpus oblongifolius)?
>  
> Thanks for sharing.
>  
> Mike
>  
> Dato’ Dr Mikaail Kavanagh, MBE
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>  
> 
> 
> On 27 Mar 2019, at 6:07 PM, Ashton, Peter <pashton at oeb.harvard.edu <mailto:pashton at oeb.harvard.edu>> wrote:
>  
> Hi Andreas and mastwatchers,
>  
> There have been several efforts to study the impact of dipterocarp winged fruit on their distance of dispersal. Bu don't forget that the vast majority rarely fall in a wind, and then only into the main canopy a few metres beneath. So studies of the comparative influence of winged versus winglessness on the fate of the embryo (trapped in the canopy versus dropping through (and then what?), survival, predation etc.) deserves study as well.
>  
> Peter
> From: Mastwatch <mastwatch-bounces at lists.phylodiversity.net <mailto:mastwatch-bounces at lists.phylodiversity.net>> on behalf of Andreas Carlson <acarlson at math.uio.no <mailto:acarlson at math.uio.no>>
> Sent: Wednesday, March 27, 2019 1:54:08 AM
> To: Siew Teu Wong
> Cc: mastwatch at lists.phylodiversity.net <mailto:mastwatch at lists.phylodiversity.net>
> Subject: Re: [Mastwatch] West Kal Mast
>  
> Dear all, 
>  
> This movie was absolutely stunning! We have been working on understanding how the geometry of these flying fruits influence their flight (https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.122.024501 <https://urldefense.proofpoint.com/v2/url?u=https-3A__journals.aps.org_prl_abstract_10.1103_PhysRevLett.122.024501&d=DwMGaQ&c=WO-RGvefibhHBZq3fL85hQ&r=QF7wtoDqCqPx93omg7bDZoXToRGpzsmD2pgreRf9a74&m=oEo1ZmDAtLb1DWViFO2kYJvttzDwwUn2NgZs9xNRjkc&s=yRfX3IQEdkRjsXw56pIl9QRoY70NNi19ALjC8c8aeb4&e=>).
> Amazing to see this fruiting and fascinating flight! 
>  
> Thanks for sharing. 
>  
> Best,
> Andreas.
> —————————————
> Andreas Carlson
> Associate Professor 
> Department of Mathematics 
> University of Oslo
> 
> E-mail: acarlson at math.uio.no <mailto:acarlson at math.uio.no>
> Phone: (+47) 228-57223
> Web: folk.uio.no/acarlson <http://folk.uio.no/acarlson>
> Skype: carlsona
> 
> 
> On 25 Mar 2019, at 10:02, Siew Te Wong <wongsiew at hotmail.com <mailto:wongsiew at hotmail.com>> wrote:
>  
> Hi all,
> This video was posted in FB, taken somewhere in Sibu, Sarawak.
> https://www.facebook.com/edgar.ong/videos/10155952528861232/ <https://urldefense.proofpoint.com/v2/url?u=https-3A__www.facebook.com_edgar.ong_videos_10155952528861232_&d=DwMGaQ&c=WO-RGvefibhHBZq3fL85hQ&r=QF7wtoDqCqPx93omg7bDZoXToRGpzsmD2pgreRf9a74&m=oEo1ZmDAtLb1DWViFO2kYJvttzDwwUn2NgZs9xNRjkc&s=3kTuXLViT1vPv-0l0R7tAj1rkKSbbR6BrMxqnUSp25o&e=>
>  
> Thank you.
>  
> Kindest regards,
> Wong
>  
> Dr (Hon) Wong Siew Te, D.J.N.  
> 准拿督黃修德荣誉博士
> C.E.O. and Founder, 
> Bornean Sun Bear Conservation Centre
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> "May all beings be happy, joyful, well, & at safety & peace!"
>  
> From: Mastwatch <mastwatch-bounces at lists.phylodiversity.net <mailto:mastwatch-bounces at lists.phylodiversity.net>> on behalf of Philipson Christopher David <christopher.philipson at usys.ethz.ch <mailto:christopher.philipson at usys.ethz.ch>>
> Sent: Monday, March 4, 2019 6:23 PM
> To: Cam Webb
> Cc: mastwatch at lists.phylodiversity.net <mailto:mastwatch at lists.phylodiversity.net>
> Subject: Re: [Mastwatch] West Kal Mast
>  
> Hi Cam and all, 
>  
> I just returned from south India and saw some dip fruiting in the forest reserves in Kerala.  Being seasonal forest its perhaps a bit less relevant to the Borneo fruiting - but it would be interesting to link these cycles climatically and genetically at some point!
>  
> Cheers
> Chris
>  
> Dr. Christopher Philipson
> christopher.philipson at usys.ethz.ch <mailto:christopher.philipson at usys.ethz.ch>
>  
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>  
> 
> 
> On 28 Feb 2019, at 18:53, Cam Webb <cam_webb at yahoo.com <mailto:cam_webb at yahoo.com>> wrote:
>  
> Thanks all, for the forest news from across Borneo (and beyond).
> 
> It seems the Gunung Palung mast was big: definitely biggest since Feb
> 2010, and maybe bigger than that one. Peak fruit fall was several weeks
> ago. Dipterocarp flowering started in late Sept 2018. I’ll post more
> details when I know them.
> 
> Best,
> 
> Cam
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