SoundHAB: Noctiluca vs brown

[Rita Horner]

Karlista,

The website Jack sent yesterday is a good description of Noctiluca.  It 
does graze on everything from bacteria to fish eggs in size.  I've seen it 
so packed with Pseudo-nitzschia that it actually had points of 
Pseudo-nitzschia sticking out the margins instead of being a round cell. A 
good way to look at it is to let the live sample sit for a while and then 
look for grayish, round cells about the size of a pin head sitting on the 
top of the sample.

As for Heterosigma, a good way to look at it is to let the live sample sit 
on a counter and watch for patches of brown around the edges of the jar or 
in the center of the jar and also look for brown streaks along the jar 
edges.  Other organisms also streak, but if you pipette some of the brown 
patches and look at them under a microscope, you should be able to 
recognize it if it is Heterosigma.

Rita 
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Rita A. Horner                        373 Marine Science Bldg
School of Oceanography
Box 357940                            Phone:  206-543-8599
University of Washington              Fax:  206-543-0275
Seattle, WA  98195-7940               rita at ocean.washington.edu

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On Tue, 12 Jun 2012, Karlista Rickerson wrote:

>
> Quarter Master Harbor at 12:30 today
> Away from the mass of Noctiluca piled at the north end or the  windward corner of the float.
> Does Noctiluca comsum other plankton or just use up all other nutrients?  The sample gathered in a qt jar had the heavy orange scum at the top, this morning the scum had piled up on the bottom of the jar (in the frig.)?Reading the other posts I remember that when I sampled from QMH yesterday I could see tan blobs at different depth drifting by under the faint orange scum.
> I took a sample of just the  tan blobs - looks like bits and pieces of Cheatoceros!
> The net tow sample that we took at 12:30 was very "clean"!    Chaetoceros rare,  Dinophyses total of 3 and no PN or Alex. Total math not yet done.
> All too interesting and I need to move on to other items!
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