Publication Date:
2023-07-09
Description:
In the naturally iron-fertilized surface waters of the northern Kerguelen Plateau region, the early spring diatom community composition and contribution to plankton carbon biomass were investigated and compared with the High Nutrient Low Chlorophyll (HNLC) surrounding waters (October-November 2011, KEOPS 2). The large iron-induced blooms were dominated by small diatom species belonging to the genera Chaetoceros (Hyalochaete) and Thalassiosira, which rapidly responded to the onset of favorable light-conditions in the meander of the Polar Front. In comparison, the iron-limited HNLC area was typically characterized by autotrophic nanoeukaryote-dominated communities and by larger and more heavily silicified diatom species (e.g. Fragilariopsis spp.). Our results support the hypothesis that diatoms are valuable vectors of carbon export to depth in naturally iron-fertilized systems of the Southern Ocean. Comparison with the diatom assemblage composition of a sediment trap deployed in the iron-fertilized area suggests that the dominant Chaetoceros (Hyalochaete) cells were less efficiently exported than the less abundant yet heavily silicified cells of Thalassionema nitzschioides and Fragilariopsis kerguelensis. Our observations emphasize the strong influence of species-specific diatom cell properties combined with trophic interactions on matter export efficiency, and illustrate the tight link between the specific composition of phytoplankton communities and the biogeochemical properties characterizing the study area.
Keywords:
Actinocyclus curvatulus; Actinocyclus curvatulus, biomass as carbon; Asteromphalus hookeri; Asteromphalus hookeri, biomass as carbon; Asteromphalus hyalinus; Asteromphalus hyalinus, biomass as carbon; Asteromphalus parvulus; Asteromphalus parvulus, biomass as carbon; Azpeitia tabularis; Azpeitia tabularis, biomass as carbon; Biomass estimation after Cornet-Barthaux et al. (2007); Bottle number; Chaetoceros aequatoriale, biomass as carbon; Chaetoceros aequatorialis; Chaetoceros aequatorialis, biomass as carbon; Chaetoceros atlanticus; Chaetoceros atlanticus, biomass as carbon; Chaetoceros atlanticus var. neapolitanus; Chaetoceros atlanticus var. neapolitanus, biomass as carbon; Chaetoceros bulbosus; Chaetoceros bulbosus, biomass as carbon; Chaetoceros concavicornis; Chaetoceros concavicornis, biomass as carbon; Chaetoceros convolutus; Chaetoceros convolutus, biomass as carbon; Chaetoceros criophilus; Chaetoceros criophilus, biomass as carbon; Chaetoceros decipiens; Chaetoceros decipiens, biomass as carbon; Chaetoceros dichaeta; Chaetoceros dichaeta, biomass as carbon; Chaetoceros flexuosus; Chaetoceros flexuosus, biomass as carbon; Chaetoceros mitra; Chaetoceros mitra, biomass as carbon; Chaetoceros peruvianus; Chaetoceros peruvianus, biomass as carbon; Chaetoceros radicans; Chaetoceros radicans, biomass as carbon; Chaetoceros socialis; Chaetoceros socialis, biomass as carbon; Chaetoceros spp.; Chaetoceros spp., biomass as carbon; Chaetoceros spp. resting spores; Chaetoceros spp. resting spores, biomass as carbon; Corethron inerme; Corethron inerme, biomass as carbon; Corethron pennatum; Corethron pennatum, biomass as carbon; Coscinodiscus sp.; Coscinodiscus sp., biomass as carbon; CTD/Rosette; CTD-RO; Dactyliosolen antarcticus; Dactyliosolen antarcticus, biomass as carbon; Dactyliosolen tenuijunctus; Dactyliosolen tenuijunctus, biomass as carbon; DATE/TIME; DEPTH, water; Diatoms; Diatoms, biomass as carbon; Diatoms, centrales; Diatoms, centrales, biomass as carbon; Diatoms, pennales; Diatoms, pennales indeterminata; Diatoms, pennales indeterminata, biomass as carbon; Elevation of event; Eucampia antarctica; Eucampia antarctica, biomass as carbon; Event label; Fragilariopsis kerguelensis; Fragilariopsis kerguelensis, biomass as carbon; Fragilariopsis pseudonana; Fragilariopsis pseudonana, biomass as carbon; Fragilariopsis separanda; Fragilariopsis separanda, biomass as carbon; Guinardia cylindrus; Guinardia cylindrus, biomass as carbon; Kerguelen Plateau; Latitude of event; Leptocylindrus danicus; Leptocylindrus danicus, biomass as carbon; Leptocylindrus mediterraneus; Leptocylindrus mediterraneus, biomass as carbon; Longitude of event; Marion Dufresne (1995); MD188; MD188_A3-2_CTD-108; MD188_E-1_CTD-028; MD188_E-3_CTD-051; MD188_E-4E_CTD-095; MD188_E-4W_CTD-081; MD188_E-5_CTD-115; MD188_F-L_CTD-064; MD188_R-2_CTD-018; Membraneis challengeri; Membraneis challengeri, biomass as carbon; Membraneis imposter; Membraneis imposter, biomass as carbon; Membraneis sp.; Membraneis sp., biomass as carbon; Navicula spp.; Navicula spp., biomass as carbon; Nitzschia bicapitata; Nitzschia bicapitata, biomass as carbon; Nitzschia closterium; Nitzschia closterium, biomass as carbon; Nitzschia longissima; Nitzschia longissima, biomass as carbon; Odontella weissflogii; Odontella weissflogii, biomass as carbon; OISO_20, KEOPS 2; Paralia spp.; Paralia spp., biomass as carbon; Plagiotropis spp.; Plagiotropis spp., biomass as carbon; Pleurosigma sp.; Pleurosigma sp., biomass as carbon; Proboscia alata; Proboscia alata, biomass as carbon; Proboscia inermis; Proboscia inermis, biomass as carbon; Proboscia truncata; Proboscia truncata, biomass as carbon; Pseudo-nitzschia spp.; Pseudo-nitzschia spp., biomass as carbon; Quantitative phytoplankton method (Utermöhl, 1958); Radiation, photosynthetically active; Rhizosolenia antennata; Rhizosolenia antennata, biomass as carbon; Rhizosolenia chunii; Rhizosolenia chunii, biomass as carbon; Rhizosolenia crassa; Rhizosolenia crassa, biomass as carbon; Rhizosolenia pungens; Rhizosolenia pungens, biomass as carbon; Rhizosolenia simplex; Rhizosolenia simplex, biomass as carbon; Rhizosolenia styliformis; Rhizosolenia styliformis, biomass as carbon; Rhizosolenia styliformis var. longispina; Rhizosolenia styliformis var. longispina, biomass as carbon; Thalassionema nitzschioides var. lanceolata; Thalassionema nitzschioides var. lanceolata, biomass as carbon; Thalassionema nitzschioides var. nitzschioides; Thalassionema nitzschioides var. nitzschioides, biomass as carbon; Thalassionema nitzschioides var. parva; Thalassionema nitzschioides var. parva, biomass as carbon; Thalassiosira gracilis; Thalassiosira gracilis, biomass as carbon; Thalassiosira lentiginosa; Thalassiosira lentiginosa, biomass as carbon; Thalassiosira spp.; Thalassiosira spp., biomass as carbon; Thalassiosira tumida; Thalassiosira tumida, biomass as carbon; Thalassiothrix antarctica; Thalassiothrix antarctica, biomass as carbon
Type:
Dataset
Format:
text/tab-separated-values, 11715 data points
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