Search Results - "Hassler, Christel S."

Southern Ocean phytoplankton physiology in a changing climate by Petrou, Katherina, Kranz, Sven A., Trimborn, Scarlett, Hassler, Christel S., Ameijeiras, Sonia Blanco, Sackett, Olivia, Ralph, Peter J., Davidson, Andrew T.

“…The Southern Ocean (SO) is a major sink for anthropogenic atmospheric carbon dioxide (CO2), potentially harbouring even greater potential for additional…”
Get full text

Iron limitation modulates ocean acidification effects on southern ocean phytoplankton communities by Hoppe, Clara J M, Hassler, Christel S, Payne, Christopher D, Tortell, Philippe D, Rost, Björn, Trimborn, Scarlett

“…The potential interactive effects of iron (Fe) limitation and Ocean Acidification in the Southern Ocean (SO) are largely unknown. Here we present results of a…”
Get full text

Saccharides enhance iron bioavailability to Southern Ocean phytoplankton by Hassler, Christel S., Schoemann, Véronique, Nichols, Carol Mancuso, Butler, Edward C. V., Boyd, Philip W., Karl, David M.

“…Iron limits primary productivity in vast regions of the ocean. Given that marine phytoplankton contribute up to 40% of global biological carbon fixation, it is…”
Get full text

Toward a Regional Classification to Provide a More Inclusive Examination of the Ocean Biogeochemistry of Iron-Binding Ligands by Hassler, Christel S., van den Berg, Constant M. G., Boyd, Philip W.

“…Iron-binding ligands are paramount to understanding iron biogeochemistry and its potential to set the productivity and the magnitude of the biological pump in…”
Get full text

impact of iron limitation on the physiology of the Antarctic diatom Chaetoceros simplex by Petrou, Katherina, Trimborn, Scarlett, Rost, Björn, Ralph, Peter J, Hassler, Christel S

“…Iron availability strongly governs the growth of Southern Ocean phytoplankton. To investigate how iron limitation affects photosynthesis as well as the uptake…”
Get full text

The role of bacterial and algal exopolymeric substances in iron chemistry by Norman, Louiza, Worms, Isabelle A.M., Angles, Emilie, Bowie, Andrew R., Nichols, Carol Mancuso, Ninh Pham, A., Slaveykova, Vera I., Townsend, Ashley T., David Waite, T., Hassler, Christel S.

“…It is widely accepted that the complexation of iron (Fe) with organic compounds is the primary factor that regulates Fe reactivity and its bioavailability to…”
Get full text

Measurement of iron chemical speciation in seawater at 4°C: The use of competitive ligand exchange–adsorptive cathodic stripping voltammetry by Hassler, Christel S., Legiret, François-Eric, Butler, Edward C.V.

“…Iron is mostly bound to poorly characterised organic ligands; thus, organic ligands are paramount in defining Fe biogeochemical cycling and its control on…”
Get full text

Long-Term Acclimation to Iron Limitation Reveals New Insights in Metabolism Regulation of Synechococcus sp. PCC7002 by Blanco-Ameijeiras, Sonia, Cosio, Claudia, Hassler, Christel S.

“…In large areas of the ocean phytoplankton growth is limited by the scarcity of iron (Fe), an essential co-factor for multiple enzymes. Phytoplankton has hence…”
Get full text

Iron Biogeochemistry in Aquatic Systems: From Source to Bioavailability by Louiza Norman, Damien J. E. Cabanesa, Sonia Blanco-Ameijeiras, Sophie A. M. Moisset, Christel S. Hassler

“…Iron (Fe) is an essential trace element for several key metabolic processes in phytoplankton; however Fe is present in low concentration in many aquatic…”
Get full text

Iron-limitation and high light stress on phytoplankton populations from the Australian Sub-Antarctic Zone (SAZ) by Petrou, Katherina, Hassler, Christel S., Doblin, Martina A., Shelly, Kirsten, Schoemann, Véronique, van den Enden, Rick, Wright, Simon, Ralph, Peter J.

“…The high nutrient low chlorophyll (HNLC) surface waters of the Southern Ocean are characterised by high concentrations of nitrate and phosphate, low…”
Get full text

Nutrient uplift in a cyclonic eddy increases diversity, primary productivity and iron demand of microbial communities relative to a western boundary current by Doblin, Martina A, Petrou, Katherina, Sinutok, Sutinee, Seymour, Justin R, Messer, Lauren F, Brown, Mark V, Norman, Louiza, Everett, Jason D, McInnes, Allison S, Ralph, Peter J, Thompson, Peter A, Hassler, Christel S

“…The intensification of western boundary currents in the global ocean will potentially influence meso-scale eddy generation, and redistribute microbes and their…”
Get full text

First Evaluation of the Role of Salp Fecal Pellets on Iron Biogeochemistry by Cabanes, Damien J. E., Norman, Louiza, Santos-Echeandía, Juan, Iversen, Morten H., Trimborn, Scarlett, Laglera, Luis M., Hassler, Christel S.

“…Planktonic grazers such as salps may have a dominant role in iron (Fe) cycling in surface waters of the Southern Ocean (SO). Salps have high ingestion rates…”
Get full text

Discriminating between intra‐ and extracellular metals using chemical extractions by Hassler, Christel S., Slaveykova, Vera I., Wilkinson, Kevin J.

“…Several washing agents (EDTA, CDTA, NTA, 8 HQS, Ti‐EDTA‐citrate, Ca2+, and H+) were tested for their ability to extract adsorbed metal from biological surfaces…”
Get full text

Exopolymeric Substances Control Microbial Community Structure and Function by Contributing to both C and Fe Nutrition in Fe-Limited Southern Ocean Provinces by Blanco-Ameijeiras, Sonia, Cabanes, Damien J E, Cable, Rachel N, Trimborn, Scarlett, Jacquet, Stéphan, Wiegmann, Sonja, Völkner, Christian, Lelchat, Florian, Bracher, Astrid, Duhaime, Melissa B, Hassler, Christel S

“…Organic ligands such as exopolymeric substances (EPS) are known to form complexes with iron (Fe) and modulate phytoplankton growth. However, the effect of…”
Get full text

Dissolved zinc isotope cycling in the Tasman Sea, SW Pacific Ocean by Samanta, Moneesha, Ellwood, Michael J., Sinoir, Marie, Hassler, Christel S.

“…The trace metal micronutrient zinc (Zn) act as a cofactor in several essential enzymes within phytoplankton. The uptake of Zn by phytoplankton is complex and…”
Get full text

Bioavailability of Iron Sensed by a Phytoplanktonic Fe-Bioreporter by Hassler, Christel S, Twiss, Michael R

“…This study describes a short-term (12 h) evaluation of iron (Fe) bioavailability to an Fe-dependent cyanobacterial bioreporter derived from Synechococcus PCC…”
Get full text

Trace metal and nutrient dynamics across broad biogeochemical gradients in the Indian and Pacific sectors of the Southern Ocean by Janssen, David J., Sieber, Matthias, Ellwood, Michael J., Conway, Tim M., Barrett, Pamela M., Chen, Xiaoyu, de Souza, Gregory F., Hassler, Christel S., Jaccard, Samuel L.

“…The Southern Ocean is the largest high-nutrient low-chlorophyll environment in the global ocean, and represents an important source of intermediate and deep…”
Get full text

Chromium stable isotope distributions in the southwest Pacific Ocean and constraints on hydrothermal input from the Kermadec Arc by Janssen, David J, Gilliard, Delphine, Rickli, Jörg, Nasemann, Philipp, Koschinsky, Andrea, Hassler, Christel S, Bowie, Andrew R, Ellwood, Michael J, Kleint, Charlotte, Jaccard, Samuel L

“…Special attention has been given to chromium (Cr) as a paleoproxy tracing redox cycling throughout Earth’s history, due to differences in the solubility of its…”
Get full text

Electrochemical evaluation of iron-binding ligands along the Australian GEOTRACES southwestern Pacific section (GP13) by Cabanes, Damien J.E., Norman, Louiza, Bowie, Andrew R., Strmečki, Slađana, Hassler, Christel S.

“…In this work, we performed electrochemical investigations of Fe-binding ligands in water samples collected in autumn 2011 along the Australian GEOTRACES…”
Get full text

Chromium Cycling in Redox-Stratified Basins Challenges δ 53 Cr Paleoredox Proxy Applications by Janssen, David J, Rickli, Jörg, Wille, Martin, Sepúlveda Steiner, Oscar, Vogel, Hendrik, Dellwig, Olaf, Berg, Jasmine S, Bouffard, Damien, Lever, Mark A, Hassler, Christel S, Jaccard, Samuel L

“…Chromium stable isotope composition (δ Cr) is a promising tracer for redox conditions throughout Earth's history; however, the geochemical controls of δ Cr…”
Get full text