HR: 14:40h
AN: PP53A-05    [Abstracts]
TI: The Influence of Salinity, Growth Rate and Temperature on D/H Fractionation in Algal Lipids from Culture and Field Studies
AU: * Sachs, J P
EM: jsachs@u.washington.edu
AF: University of Washington, School of Oceanography, Box 355351, Seattle, WA 98195, United States
AU: Schwab, V
EM: vfschwab@u.washington.edu
AF: University of Washington, School of Oceanography, Box 355351, Seattle, WA 98195, United States
AU: Sachse, D
EM: dsachse@u.washington.edu
AF: University of Washington, School of Oceanography, Box 355351, Seattle, WA 98195, United States
AU: Cash, A
EM: amycash@u.washington.edu
AF: University of Washington, School of Oceanography, Box 355351, Seattle, WA 98195, United States
AU: Nelson, D
EM: dbnelson@u.washington.edu
AF: University of Washington, School of Oceanography, Box 355351, Seattle, WA 98195, United States
AU: Zhang, Z
EM: zhaohui@nsm.umass.edu
AF: University of Massachusetts, Department of Geosciences, 611 North Pleasant Street, Amherst, MA 01003, United States
AU: Kawka, O
EM: kawkaoe@u.washington.edu
AF: University of Washington, School of Oceanography, Box 355351, Seattle, WA 98195, United States
AB: The use of compound-specific D/H ratios to decipher biochemical, geochemical, oceanographic, and climatic processes is expanding rapidly. The relative success of these efforts depends on an understanding of the environmental conditions that influence the deuterium depletion relative to environmental water observed in all plant, algal and bacterial lipids, and the sensitivity of D/H fractionation responses to changes in those environmental conditions. Presently very little is known about this interplay between the environment and D/H fraction in algal lipids. Here we present results from field studies (in the Chesapeake Bay, Christmas Island, the Great Salt Lake, and saline basins in Alberta and Saskatchewan) and culture studies (both continuous and batch) that indicate that salinity, growth rate and temperature each influence D/H fractionation in algal lipids to varying degrees, depending on the algae and the lipid. Our initial results indicate that D/H fractionation (1) decreases with increasing salinity, (2) increases with increasing growth rate in isoprenoid lipids, (3) is insensitive to growth rate in acetogenic lipids, and (4) increases with increasing temperature.
DE: 0420 Biomolecular and chemical tracers
DE: 0454 Isotopic composition and chemistry (1041, 4870)
DE: 0473 Paleoclimatology and paleoceanography (3344, 4900)
DE: 4850 Marine organic chemistry (0470, 1050)
DE: 4870 Stable isotopes (0454, 1041)
SC: Paleoceanography and Paleoclimatology [PP]
MN: 2007 Fall Meeting