Cobalt speciation and bioavailability in marine organisms

Nolan, C. N.; Fowler, S. W.; Teyssié, Jean‐Louis

doi:10.3354/meps088105

Cited by 46 publications

(30 citation statements)

References 18 publications

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“…l), possibly indicating an abiotic uptake pathway. Phytoplankton may not be able to use Co ion that is not associated with cobalamin, as shown for diatoms (Nolan et al 1992). The accumulation of Ag and Am by marine plankton is comparable to that of Pb which is largely associated with the surfaces of both phyto-and zooplankton (Michaels and Flegal 1990).…”

Section: Discussionmentioning

confidence: 99%

The assimilation ofelements ingested by marine planktonic bivalve larvae

Reinfelder

Fisher

1994

Limnology & Oceanography

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The assimilation efficiencies of nine elements were measured in planktonic bivalve mollusc larvae (oysters, Crassostrea virginica, and hard clams, Mercenaria mercenaria) fed uniformly radiolabeled phytoplankton cells (Zsochrysis galbana) in order to test whether the "liquid" digestion strategy observed in marine copepods operates in other planktonic hcrbivorcs with gut morphologies different from that of crustacean zooplankton. Of the elcmcnts studied (Ag, Am, C, Cd, Co, P, S, Se, and Zn), americium was assimilated the least by both the larval oysters (7.9%) and clams (2.6Oh), while selenium was assimilated with the highest efficiency by the larvae (oysters, 97%; clams, 1 OOO/o). Assimilation efficiencies were directly related to the fraction of each clement present in the cytoplasm of the ingested algae. Like copepods, bivalve larvae have short gut passage times and assimilate only the easily mobilized, cytoplasmic fraction of ingested phytoplankton cells. The cytoplasmic fraction of some elements (Se, Zn, and Cd) and ofprotein in I. galbana increased inversely with algal growth rate. Larvae feeding on seneseent cells would therefore be expected to assimilate proportionately more ofthcse elements and protein than when feeding on rapidly dividing cells.

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Section: Discussionmentioning

confidence: 99%

The assimilation ofelements ingested by marine planktonic bivalve larvae

Reinfelder

Fisher

1994

Limnology & Oceanography

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“…Nolan et al (1992) reported that only cobalamine was assimilated by diatoms, whereas inorganic Co was less available. Inorganic Co taken up by algae is largely bound to cell surfaces (> 80%, Reinfelder and Fisher 199 1; this stud.y) and may not behave as an essential element.…”

Section: Discussionmentioning

confidence: 99%

Assimilation of trace elements and carbon by the mussel Mytilus edulis: Effects of food composition

Wang¹,

Fisher²

1996

Limnology & Oceanography

232

190

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Assimilation efficiency (AE) is an important physiological parameter in determining trace element influx from food sources into aquatic animals. We used radiotracer techniques to examine the influence of diet [seven species of algae (two diatoms, two chlorophytes, a prasinophyte, and two dinoflagellates) and glass beads] on the assimilation of seven trace elements (Ag, Am, Cd, Co, Cr, Se, Zn) and C in the mussel Mytilus edulis. Trace element assimilation was related to C assimilation and cytoplasmic distribution in the algae and to gut passage time in the mussels. Mussels displayed different C AEs for the different algal diets; the chlorophytes, which had highly refractory cell walls, were the least digestible food. Assimilation of Cd, Se, and Zn was directly correlated with C assimilation; for Am, Ag, and Cr, no relationship with C assimilation was apparent. For each species except the chlorophytes, AEs of all elements significantly correlated with their cytoplasmic distribution within each algal cell. Among all species, AEs of Am, Co, and Se also increased with elemental penetration into the cytoplasm; however, this relationship was not statistically significant for Ag, Cd, or Zn. With the exception of Cr, AEs of elements increased with gut passage time, implying more efficient digestion-absorption when the element was retained longer in the digestive tract. In waters containing large mussel populations, unassimilated particle-reactive elements should be removed from suspension and enriched in biodeposits in sediments, whereas assimilated metals should be enriched in mussel tissues.For bivalve molluscs, both dissolved and particulate sources can contribute to metal accumulation in tissues. Uptake of metals from the dissolved phase occurs primarily across the gills, after which metals are transported into various organs. Accumulation of metals from particulate sources occurs by ingesting and assimilating metals from particulate sources. Metal influx from particles is a direct function of the assimilation efficiency (AE) of metals, the metal concentration in the ingested particles, and the ingestion activity of the animal (Thomann 198 1;Luoma et al. 1992). Assimilation represents a first-order physiological process that can be compared among different metals, food types, and environmental conditions, and AE can be used to measure metal bioavailability from specific foods.l Corresponding author.

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“…Despite the range of Co isotopes available (Table 2) there have been relatively few studies examining the seawater speciation of Co. Work by Nolan et al (1992) utilised a dual tracer approach where the uptake of 57 Co-cobalamine was compared to that of 60 Co-Co(II) and found that the cobalamine was taken up significantly faster and retained for longer in phytoplankton. 57 Co was also used to show that Co could replace Zn in the enzyme carbonic anhydrase in some phytoplankton (Yee and Morel, 1996).…”

Section: Cobalt (Co)mentioning

confidence: 99%