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, https://doi.org/10.1594/PANGAEA.846456, 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, https://doi.org/10.1016/j.chemosphere.2015.04.067
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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: 0 m * Maximum DEPTH, sediment/rock: 0 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 * Device: Multiple investigations (MULT)
|#||Name||Short Name||Unit||Principal Investigator||Method||Comment|
|1||Event label||Event||Poigner, Harald|
|2||Sample code/label||Sample label||Poigner, Harald|
|3||Date/Time of event||Date/Time||Poigner, Harald|
|4||Latitude of event||Latitude||Poigner, Harald|
|5||Longitude of event||Longitude||Poigner, Harald|
|6||Elevation of event||Elevation||m||Poigner, Harald|
|7||DEPTH, sediment/rock||Depth||m||Poigner, Harald||Geocode|
|8||Laternula elliptica, length of valve||L. elliptica l||mm||Poigner, Harald||Vernier caliper|
|9||Laternula elliptica, height of valve||L. elliptica h||mm||Poigner, Harald||Vernier caliper||Perpendicular on shell length|
|10||Laternula elliptica, width of valve||L. elliptica w||mm||Poigner, Harald||Vernier caliper||Wide of one valve (mean of both valves)|
|11||Iron, haemolymph fluid and hemocytes||Fe hfh||mg/l||Poigner, Harald||ICP-OES after acid digestion (Poigner et al, 2013)|
|12||δ56Fe||δ56Fe||‰||Poigner, Harald||MC-ICP-MS after acid digestion, anion-exchange chromatography (Schönberg, 2005)||Measured in hemolymph fluid and hemocytes|
114 data points