[LTER-mcm-pi] 5 min gem for the week

[Priscu, John]

Tina—the 18S data should pick-up fungi—correct?

From: cvesbach at gmail.com [mailto:cvesbach at gmail.com] On Behalf Of Cristina Vesbach
Sent: Wednesday, September 16, 2015 11:52 AM
To: Priscu, John
Cc: John Barrett; mcm-pi at lists.lternet.edu
Subject: Re: [LTER-mcm-pi] 5 min gem for the week

I too missed yesterday's call, sorry, I forgot to put the new time in my calendar.  I think in the summer, physical disruption (streamflow) plays a big part in maintaining diversity, while micro scale gradients in nutrients promote diversity.  Can we test this by comparing bacterioplankton dynamics in summer vs. winter? Or above and below the chemocline?  The limno samples were loaded onto the sequencer an hour ago, so we can look at these next week (I think we have 3 summers for 3 lakes on that run, 16S only, but 18S is prepped and in the queue).  Finally, viruses should play a role too, but have no data on this.  Samples are prepped, but my student working on this bailed.  My tech and I are prepping the viriome libraries next week (this is the last step before sequencing).

On Wed, Sep 16, 2015 at 10:32 AM, Priscu, John <jpriscu at montana.edu<mailto:jpriscu at montana.edu>> wrote:
So where do the MCM soils, streams and lakes fit into this paradigm?

[cid:image001.jpg at 01D0F076.6FC1BF80]

From: John Barrett [mailto:jebarre at vt.edu<mailto:jebarre at vt.edu>]
Sent: Wednesday, September 16, 2015 10:22 AM
To: Priscu, John
Cc: mcm-pi at lists.lternet.edu<mailto:mcm-pi at lists.lternet.edu>
Subject: Re: [LTER-mcm-pi] 5 min gem for the week

Wow, that's uncanny John. I was just using the paradox of the plankton in discussion with my grad students.

My guess would be viruses to explain diversity in lakes. They are otherwise too stable - unless we can invoke flood years as a physical disruption that offsets competative exclusion. Are there data in the cool years to show decreases in diversity? That would be a test of whether floods acted to upset equilibrium in species composition.



On Wed, Sep 16, 2015 at 12:15 PM, Priscu, John <jpriscu at montana.edu<mailto:jpriscu at montana.edu>> wrote:
Sorry that I missed the call yesterday—didn’t get home from Europe until midnight and was not well organized—in other words, I forgot about the call.

Here would be my gem for the week: So, where does the MCM fit into Terborgh’s scheme? We have few predators (I think we do—at least for the lakes), yet biodiversity is relatively high. What replaces predators in our system—Viruses? physical disruption? Maybe physical disruption occurs faster than competitive exclusion, maintaining high diversity? This kind of contemporaneous disequilibrium has been proposed by Richerson et al. 1970 (attached) [Richerson was the chair of my grad committee].

JP

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Department of Biological Sciences
Virginia Tech
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Cristina Takacs-Vesbach
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UNM Biology
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