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<DIV id=headline class=story><FONT size=5><STRONG>Deep-Sea Corals Record
Dramatic Long-Term Shift in Pacific Ocean Ecosystem</STRONG></FONT></DIV>
<DIV id=first><SPAN class=date>Dec. 15, 2013</SPAN></DIV>
<DIV><SPAN class=date><A
href="http://www.sciencedaily.com/releases/2013/12/131215160902.htm">http://www.sciencedaily.com/releases/2013/12/131215160902.htm</A></SPAN></DIV>
<DIV style="PADDING-BOTTOM: 10px">
<P><SPAN class=date></SPAN>Long-lived deep-sea corals preserve evidence of a
major shift in the open Pacific Ocean ecosystem since around 1850, according to
a study by researchers at the University of California, Santa Cruz. The
findings, published December 15 in <EM>Nature</EM>, indicate that changes at the
base of the marine food web observed in recent decades in the North Pacific
Subtropical Gyre may have begun more than 150 years ago at the end of the Little
Ice Age.</P>
<P>Deep-sea corals are colonial organisms that can live for thousands of years,
feeding on organic matter that rains down from the upper levels of the ocean.
The corals' branching, tree-like skeletons are composed of a hard protein
material that incorporates chemical signatures from their food sources. As a
result, changes in the composition of the growth layers in deep-sea corals
reflect changes in the organisms that lived in the surface waters at the time
each layer formed.</P>
<DIV id=text>
<P>"They're like living sediment traps, recording long-term changes in the open
ocean that we can't see any other way," said coauthor Matthew McCarthy,
professor of ocean sciences at UC Santa Cruz.</P>
<P>Scientists can study sediment cores taken from the ocean floor for clues to
past conditions in the oceans, but that approach is not very useful for the most
recent millennia. In the open ocean of the North Pacific, sediment accumulates
so slowly that the entire Holocene epoch (the past 12,000 years or so) is
represented by less than 10 centimeters (4 inches) of sediment that has been
stirred up by organisms living on the seafloor. "Even if there were good
sediment records, we would never get the level of detail we can get from the
corals," McCarthy said.</P>
<P>To analyze the coral skeletons, the UCSC researchers combined carbon dating
with a novel technique for analyzing nitrogen isotopes in proteins. They were
able to reconstruct records over the past 1,000 years indicating that a shift
occurred around 1850 in the source of nitrogen feeding the surface waters of the
open ocean. As a result of decreasing nitrogen inputs from subsurface water, the
phytoplankton community at the base of the food web became increasingly
dominated by nitrogen-fixing cyanobacteria, which are able to use the nitrogen
gas absorbed by surface waters from the atmosphere.</P>
<P>"In the marine environment, the two major sources of nitrogen are dissolved
nitrate, which is more concentrated in the subsurface and deep water and is
brought to the surface by upwelling, and nitrogen fixation by specialized
microorganisms that are like the legumes of the sea," explained first author
Owen Sherwood, who worked on the study as a postdoctoral researcher at UCSC and
is now at the University of Colorado, Boulder.</P>
<P>The shift revealed in the coral record--from an ecosystem supported by
nitrate coming up from deeper waters to one supported more by nitrogen-fixing
organisms--may be a result of the North Pacific Subtropical Gyre expanding and
becoming warmer, with more stable layering of warm surface water over cooler
subsurface water. This increased "stratification" limits the amount of nutrients
delivered to the surface in nutrient-rich subsurface water.</P>
<P>Scientists have observed warming and expansion of the major mid-ocean
subtropical gyres in the past few decades and have attributed this trend to
global warming. The new study puts these observations in the context of a
longer-term trend. "It seems that the change in nitrogen sources, and therefore
possibly large-scale shifts in ocean conditions, switched on at the end of the
Little Ice Age and it is still continuing today," McCarthy said.</P>
<P>A key innovation in nitrogen isotope analysis was crucial to this study.
Nitrogen-15 is a minor stable isotope of nitrogen, and the ratio of nitrogen-15
to nitrogen-14 is widely used to trace different sources of nitrogen. The
nitrogen fixed by cyanobacteria in surface water, for example, has a different
isotope ratio from the nitrates in deep ocean water. The isotope ratio also
changes as organisms eat each other and nitrogen moves through the food web,
with organisms at the base of the web having lower ratios than organisms at
higher "trophic levels."</P>
<P>Thus, two independent factors--the trophic level and the original source of
the nitrogen--determine the nitrogen isotope ratio in an organism. McCarthy's
lab developed a technique that can separate these two factors by analyzing
individual amino acids--the building blocks of proteins. It turns out that the
isotope ratios of some amino acids remain unchanged as they move up the food
web, while other amino acids become enriched in nitrogen-15 with each trophic
transfer.</P>
<P>"Amino acid analysis decouples the two effects so we can see their relative
magnitudes," McCarthy said. "What we're seeing in the central Pacific is a major
shift at the base of the food web."</P>
<P>The extent of the change is dramatic: a 17 to 27 percent increase in
nitrogen-fixation since about 1850, after almost a millennium of relatively
minor fluctuations. "In comparison to other transitions in the paleoceanographic
record, it's gigantic," Sherwood said. "It's comparable to the change observed
at the transition between the Pleistocene and Holocene Epochs, except that it
happens an order of magnitude faster."</P>
<P>These and other recent results are changing scientists' notions about the
stability of open ocean gyres such as the North Pacific Subtropical Gyre, which
is the largest contiguous ecosystem on the planet. These open ocean gyres were
once considered relatively static, nutrient-deprived "deserts." In the 1980s,
however, scientists began regularly monitoring oceanographic conditions at
deep-water station ALOHA near Hawaii, revealing a surprising amount of
variability.</P>
<P>"Instead of relatively constant ocean deserts, time-series data has shown
dynamic decadal-scale changes," McCarthy said. "Our new records from deep-sea
corals now show that the decadal-scale changes are really only small
oscillations superimposed on a dramatic long-term shift at the base of the
Pacific ecosystem. This long-term perspective may help us better predict the
effects of global warming on open ocean regions."</P>
<P>The new findings also suggest a new interpretation of data from other
researchers showing changes in nitrogen isotopes in the bones of seabirds. A
recent study of Hawaiian petrel bones using bulk nitrogen isotope data
attributed the change to shifts in the length of open ocean food chains,
possibly induced by overfishing (forcing petrels to feed lower on the food
chain). In fact, the compound-specific data strongly imply that isotopic changes
on all trophic levels are more likely due to the long-term shift in nitrogen
sources at the base of the food web, McCarthy said.</P>
<P>Coauthor Tom Guilderson, who is affiliated with UCSC and Lawrence Livermore
National Laboratory, has been collecting deep-sea corals for more than a decade
to study them for clues to past oceanographic and environmental conditions. He
teamed up with McCarthy to initiate this project. In addition to McCarthy,
Guilderson, and Sherwood, the coauthors of the paper include UCSC graduate
students Fabian Batista and John Schiff.</P>
<P>Coral samples were collected by the Hawaiian Undersea Research Lab's Pisces V
submersible, with funding from the National Oceanic and Atmospheric
Administration (NOAA) and the National Geographic Society. The bulk of this
research was funded by the National Science
Foundation.</P></DIV></DIV></FONT></BODY></HTML>