COPEPOD GRAZING AND THE BIOGEOCHEMICAL FATE OF DIATOM IRON

被引：102

作者：

HUTCHINS, DA

WANG, WX

FISHER, NS

机构：

来源：

LIMNOLOGY AND OCEANOGRAPHY | 1995年 / 40卷 / 05期

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.

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页码：989 / 994

页数：6

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