Organic Matter Composition, Recycling Susceptibility, and the Effectiveness of the Biological Pump – An Evaluation Using NMR Spectra of Marine Plankton Page: 2 of 3
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This portion of the research has been completed, and a manuscript is in preparation. As
Fig. 1 indicates, there were more significant differences with P forms than with C forms. Low
temperature stress produced significant differences in orthophosphate concentration, but no
differences in C forms, while high temperature stress resulted in significant differences in C
forms (lipids), but no differences in P forms. Low light did not produce significant differences in
P or C forms, but high light significantly altered both P and C forms. Both low and high P
affected P forms, particularly pyrophosphate and phospholipids, but had no affect on C forms.
Field Studies
We had three main collections of field samples for this study. The first was a compilation of
sediment trap and plankton tow samples from throughout the world's oceans to look at spatial
and temporal variability in organic matter composition. Bothe temporal and spatial variability
were detected and results were published in a manuscript in Marine Chemistry.
The second was a series of plankton tows collected off Barrow Alaska under ice and at ice
edge, plus core-top samples from the same region. Unfortunately, these samples were preserved
in formalin, so we could not analyze them by 1C NMR spectroscopy. However, we observed
some interesting differences in P forms, which were directly related to differences in organisms
from the ice-edge bloom Fig. 2). The manuscript for this work is in review in Global and
Planetary Change.
00,e tOFS 60
Tahs 1-
ice Edge
-~~ ro---r.
Tang 5 o~lm 40 80 120
PC 1435 % Plankton BiovoIune (ml n'}
Figure 2: Principle component analysis of 31P NMR spectra plankton tows and core top samples (left) from Alaska.
Tow 5, at ice edge, had different species (right), resulting in different P forms from tows collected under ice.
The third set of field samples were collected in Monterey Bay in 2006. Samples were
collected seasonally (in Feb., April, June and Sept.) from four mooring locations (C1, MO, M1
and M2). Samples collected were plankton tows and seawater, which was filtered through 1- m
mesh.
This portion of the research has been completed, and a manuscript is in preparation.
When analyzed with all dates and locations together, plankton were significantly higher in total P,
organic P, total C and total N than particulate samples and were significantly lower in
orthophosphate and higher in monoesters. However, there were no differences in C forms.
Analyzing plankton samples by date (with location as the replicate), there were no significant
differences in P or C forms, but significant differences in the C:P and N:P ratios, which were both
highest in February and lowest in September. Analyzing particulate samples by date (with
location as the replicate), there were significant differences in total P, total C and total N. Total P
was highest in September and lowest in June, while N and C were highest in June and lowest in
February. There were no significant seasonal differences in particulate P forms, but there were
differences in C forms, with proteins significantly higher in April than in February.
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Paytan, Adina. Organic Matter Composition, Recycling Susceptibility, and the Effectiveness of the Biological Pump – An Evaluation Using NMR Spectra of Marine Plankton, report, February 19, 2014; Santa Cruz, California. (https://digital.library.unt.edu/ark:/67531/metadc867773/m1/2/: accessed March 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.