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Science 24 May 1996:
Vol. 272. no. 5265, pp. 1163 - 1166
DOI: 10.1126/science.272.5265.1163
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Reports
Vertical Flux of Biogenic Carbon in the Ocean: Is There Food
Web Control?
Richard B. Rivkin,
*
Louis Legendre,
Don Deibel,
Jean-Éric Tremblay,
Bert Klein,
Kenneth Crocker,
Suzanne Roy,
Norman Silverberg,
Connie Lovejoy,
Fabrice Mesplé,
Nancy Romero,
M. Robin Anderson,
Paul Matthews,
Claude Savenkoff,
Alain Vézina,
Jean-Claude Therriault,
Joel Wesson,
Chantal Bérubé,
R.
Grant Ingram
Models of biogenic carbon (BC) flux assume that short herbivorous
food chains lead to high export, whereas complex microbial or
omnivorous food webs lead to recycling and low export, and that export
of BC from the euphotic zone equals new production (NP). In the Gulf of
St. Lawrence, particulate organic carbon fluxes were similar during the
spring phytoplankton bloom, when herbivory dominated, and during
nonbloom conditions, when microbial and omnivorous food webs dominated.
In contrast, NP was 1.2 to 161 times greater during the bloom than
after it. Thus, neither food web structure nor NP can predict the
magnitude or patterns of BC export, particularly on time scales over
which the ocean is in nonequilibrium conditions.
R. B. Rivkin, D. Deibel, K. Crocker, P. Matthews, Ocean Sciences
Centre, Memorial University of Newfoundland, St. John's, NF A1C 5S7,
Canada.
L. Legendre, J.-É. Tremblay, B. Klein, C. Lovejoy, F. Mesplé, Département de biologie, Université Laval,
Québec, QC G1K 7P4, Canada.
S. Roy, INRS-Océanologie, 310 Alée des Ursulines, Rimouski,
QC G5L 3A1, Canada.
N. Silverberg, N. Romero, C. Savenkoff, A. Vézina, J.-C.
Therriault, C. Bérubé, Institut Maurice-Lamontagne,
Ministère des Pêches et des Océans, Casse Postale
1000, Mont-Joli, G5H 3Z4 QC, Canada.
M. R. Anderson, Marine Habitat Research, Science Branch, Fisheries and
Oceans Canada, Newfoundland Region, Post Office Box 5667, St. John's,
NF A1C 5X1, Canada.
J. Wesson and R. G. Ingram, Department of Atmospheric and Oceanic
Sciences, McGill University, 805 Sherbrooke Street West, Montreal, QC
H3A 2K6, Canada.
*
To whom correspondence should be addressed.
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