COPEPOD GRAZING AND THE BIOGEOCHEMICAL FATE OF DIATOM IRON

被引:102
作者
HUTCHINS, DA
WANG, WX
FISHER, NS
机构
关键词
D O I
10.4319/lo.1995.40.5.0989
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
We investigated the effects of copepod grazing on fractionation of diatom cellular Fe into assimilated, dissolved, and fecal pellet pools. Grazer assimilation was only weakly dependent on prey N:Fe ratios, with assimilation efficiencies approximately tripling over a 100-fold increase in diatom N:Fe ratios. Assimilation efficiencies strongly correlated with prey subcellular partitioning, however, exhibiting a 1:1 relationship to cell cytoplasmic content and a 1:3 relationship with diatom intracellular content. Release of Fe from copepod fecal pellets conformed with a two-compartment loss model, with roughly 80% of associated Fe in a slowly released pool (tb(1/2) = 113 d). Partitioning into dissolved, assimilated, and fecal pellet pools indicated that all three are important fates for ingested cellular Fe.
引用
收藏
页码:989 / 994
页数:6
相关论文
共 30 条
[1]  
ANGEL MV, 1984, FLOWS ENERGY MATERIA, P475
[2]   INTERACTIVE INFLUENCES OF BIOACTIVE TRACE-METALS ON BIOLOGICAL PRODUCTION IN OCEANIC WATERS [J].
BRULAND, KW ;
DONAT, JR ;
HUTCHINS, DA .
LIMNOLOGY AND OCEANOGRAPHY, 1991, 36 (08) :1555-1577
[3]  
Caron D.A., 1990, P283
[4]   THE TROPHIC ROLE OF MESOZOOPLANKTON AT 47-DEGREES-N, 20-DEGREES-W DURING THE NORTH-ATLANTIC BLOOM EXPERIMENT [J].
DAM, HG ;
MILLER, CA ;
JONASDOTTIR, SH .
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY, 1993, 40 (1-2) :197-212
[5]   IMPACT OF AN ATMOSPHERIC OCEANIC DISTURBANCE ON PHYTOPLANKTON COMMUNITY DYNAMICS IN THE NORTH PACIFIC CENTRAL GYRE [J].
DITULLIO, GR ;
LAWS, EA .
DEEP-SEA RESEARCH PART A-OCEANOGRAPHIC RESEARCH PAPERS, 1991, 38 (10) :1305-1329
[6]   A STOICHIOMETRIC ANALYSIS OF THE ZOOPLANKTON-PHYTOPLANKTON INTERACTION IN MARINE AND FRESH-WATER ECOSYSTEMS [J].
ELSER, JJ ;
HASSETT, RP .
NATURE, 1994, 370 (6486) :211-213
[7]   THE RELEASE OF TRACE-ELEMENTS BY DYING MARINE-PHYTOPLANKTON [J].
FISHER, NS ;
WENTE, M .
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS, 1993, 40 (04) :671-694
[8]   ACCUMULATION AND CELLULAR-DISTRIBUTION OF AM-241, PO-210, AND PB-210 IN 2 MARINE-ALGAE [J].
FISHER, NS ;
BURNS, KA ;
CHERRY, RD ;
HEYRAUD, M .
MARINE ECOLOGY PROGRESS SERIES, 1983, 11 (03) :233-237
[9]   ASSIMILATION OF METALS IN MARINE COPEPODS AND ITS BIOGEOCHEMICAL IMPLICATIONS [J].
FISHER, NS ;
NOLAN, CV ;
FOWLER, SW .
MARINE ECOLOGY PROGRESS SERIES, 1991, 71 (01) :37-43
[10]   SCAVENGING AND RETENTION OF METALS BY ZOOPLANKTON FECAL PELLETS AND MARINE SNOW [J].
FISHER, NS ;
NOLAN, CV ;
FOWLER, SW .
DEEP-SEA RESEARCH PART A-OCEANOGRAPHIC RESEARCH PAPERS, 1991, 38 (10) :1261-1275