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Poigner, Harald; Wilhelms-Dick, Dorothee; Abele, Doris; Staubwasser, Michael; Henkel, Susann (2015): Iron assimilation by the clam Laternula elliptica from Potter Cove, King Georg Island, Antarctica. PANGAEA,, Supplement to: Poigner, H et al. (2015): Iron assimilation by the clam Laternula elliptica: Do stable isotopes (d56Fe) help to decipher the sources? Chemosphere, 134, 294-300,

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Iron stable isotope signatures (d56Fe) in hemolymph (bivalve blood) of the Antarctic bivalve Laternula elliptica were analyzed by Multiple Collector-Inductively Coupled Plasma-Mass Spectrometry (MC-ICP-MS) to test whether the isotopic fingerprint can be tracked back to the predominant sources of the assimilated Fe. An earlier investigation of Fe concentrations in L. elliptica hemolymph suggested that an assimilation of reactive and bioavailable Fe (oxyhydr)oxide particles (i.e. ferrihydrite), precipitated from pore water Fe around the benthic boundary, is responsible for the high Fe concentration in L. elliptica (Poigner et al., 2013, doi:10.1016/j.ecss.2013.10.027).
At two stations in Potter Cove (King George Island, Antarctica) bivalve hemolymph showed mean d56Fe values of -1.19 ± 0.34 per mil and -1.04 ± 0.39 per mil, respectively, which is between 0.5 per mil and 0.85 per mil lighter than the pool of easily reducible Fe (oxyhydr)oxides of the surface sediments (-0.3 per mil to -0.6 per mil). This is in agreement with the enrichment of lighter Fe isotopes at higher trophic levels, resulting from the preferential assimilation of light isotopes from nutrition. Nevertheless, d56Fe hemolymph values from both stations showed a high variability, ranging between -0.21 per mil (value close to unaltered/primary Fe(oxyhydr)oxide minerals) and -1.91 per mil (typical for pore water Fe or diagenetic Fe precipitates), which we interpret as a "mixed" d56Fe signature caused by Fe assimilation from different sources with varying Fe contents and d56Fe values. Furthermore, mass dependent Fe fractionation related to physiological processes within the bivalve cannot be ruled out.
This is the first study addressing the potential of Fe isotopes for tracing back food sources of bivalves.
Median Latitude: -62.234045 * Median Longitude: -58.659960 * South-bound Latitude: -62.237090 * West-bound Longitude: -58.670730 * North-bound Latitude: -62.231000 * East-bound Longitude: -58.649190
Date/Time Start: 2012-02-20T21:00:00 * Date/Time End: 2012-03-07T11:25:00
Minimum DEPTH, sediment/rock: m * Maximum DEPTH, sediment/rock: m
PotterCove_Laternula_STA04 * Latitude: -62.231000 * Longitude: -58.649190 * Date/Time: 2012-03-07T11:25:00 * Elevation: -10.0 m * Location: Potter Cove, King George Island, Antarctic Peninsula * Method/Device: Multiple investigations (MULT)
PotterCove_Laternula_STA11 * Latitude: -62.237090 * Longitude: -58.670730 * Date/Time: 2012-02-20T21:00:00 * Elevation: -5.0 m * Location: Potter Cove, King George Island, Antarctic Peninsula * Method/Device: Multiple investigations (MULT)
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventPoigner, Harald
2Sample code/labelSample labelPoigner, Harald
3Date/Time of eventDate/TimePoigner, Harald
4Latitude of eventLatitudePoigner, Harald
5Longitude of eventLongitudePoigner, Harald
6Elevation of eventElevationmPoigner, Harald
7DEPTH, sediment/rockDepthmPoigner, HaraldGeocode
8Laternula elliptica, length of valveL. elliptica lmmPoigner, HaraldVernier caliper
9Laternula elliptica, height of valveL. elliptica hmmPoigner, HaraldVernier caliperPerpendicular on shell length
10Laternula elliptica, width of valveL. elliptica wmmPoigner, HaraldVernier caliperWide of one valve (mean of both valves)
11Iron, haemolymph fluid and hemocytesFe hfhmg/lPoigner, HaraldICP-OES after acid digestion (Poigner et al, 2013)
12δ56Feδ56FePoigner, HaraldMC-ICP-MS after acid digestion, anion-exchange chromatography (Schönberg, 2005)Measured in hemolymph fluid and hemocytes
114 data points

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