Meridional distribution of arsenic species in the subantarctic zone of the Southern Ocean, south of Australia

Distribution of the arsenic species total inorganic arsenic [As(V+III)], arsenite [As(III)], monomethyl arsenic (MMA), and dimethyl arsenic (DMA) was studied in the Subantarctic Zone (SAZ) of the Southern Ocean, south of Australia, during the austral autumn (March 1998). As(V) was the dominant arsenic species in both vertical profiles and surface waters along the meridional transect 42°–55°S, 141°30′E. It was also the only species observed at depths >600 m. Concentrations of the reduced arsenic species (As(III), MMA, and DMA) were low in these waters compared with other oceanic sites with similar concentrations of chlorophyll a. As(III) concentrations could not be reliably quantified at any sites (<0.04 nM). The greatest conversion of As(V) to “biological” species was found at the surface in the Subtropical Convergence Zone (2.5%) and decreased heading southward to 1% in the Polar Front (PF). While the decline in methyl arsenic concentrations was broadly associated with water temperature and measures of biological production, slightly different trends were found in the SAZ and PF. North of the Subantarctic Front (SAF), methyl arsenic concentrations were well correlated with water temperature, while south of the front, no such relation existed. In addition, the ratio DMA/MMA increased south of the SAF, associated with a change in the microalgal community composition. Low water temperature, phosphate-replete conditions, and low biological productivity in the Southern Ocean all contribute to the concentrations of biologically produced arsenic species in this region being among the lowest reported for oceanic waters.

[1]  A. Wilmotte,et al.  Molecular and pigment studies of the picophytoplankton in a region of the Southern Ocean (42–54°S, 141–144°E) in March 1998 , 2002 .

[2]  M. Elskens,et al.  Phytoplankton and microzooplankton variability between the Subtropical and Polar Fronts south of Australia: Thriving under regenerative and new production in late summer , 2001 .

[3]  John Parslow,et al.  Optical properties of waters in the Australasian sector of the Southern Ocean , 2001 .

[4]  T. Trull,et al.  Moored sediment trap measurements of carbon export in the Subantarctic and Polar Frontal zones of the Southern Ocean, south of Australia , 2001 .

[5]  P. Boyd,et al.  A persistent subsurface chlorophyll maximum in the Interpolar Frontal Zone south of Australia: Seasonal progression and implications for phytoplankton-light-nutrient interactions , 2001 .

[6]  T. Trull,et al.  Seasonal nutrient depletion and carbon export in the Subantarctic and Polar Frontal zones of the Southern Ocean south of Australia , 2001 .

[7]  S. Rintoul,et al.  Seasonal evolution of the mixed layer in the Subantarctic zone south of Australia , 2001 .

[8]  S. Lohrenz,et al.  Antimony and arsenic biogeochemistry in the western Atlantic Ocean , 2001 .

[9]  E. Butler,et al.  A shipboard method for arsenic speciation using semi-automated hydride generation atomic fluorescence spectroscopy , 2000 .

[10]  B. Quéguiner,et al.  Limitation of algal growth by iron deficiency in the Australian Subantarctic Region , 1999 .

[11]  S. Rintoul,et al.  A late winter hydrographic section from Tasmania to Antarctica , 1999 .

[12]  P. Boyd,et al.  Role of iron, light, and silicate in controlling algal biomass in subantarctic waters SE of New Zealand , 1999 .

[13]  C. Measures,et al.  The 1996 IOC contaminant baseline survey in the Atlantic Ocean from 33°S to 10°N: introduction, sampling protocols, and hydrographic data , 1999 .

[14]  H. Hasegawa,et al.  Arsenic Speciation Including 'Hidden' Arsenic in Natural Waters (INTERFACE SCIENCE-Separation Chemistry) , 1999 .

[15]  A. Howard,et al.  Evidence supporting the presence of dissolved dimethylarsinate in the marine environment , 1999 .

[16]  L. Cutter,et al.  Metalloids in the high latitude North Atlantic Ocean: Sources and internal cycling , 1998 .

[17]  C. Measures,et al.  The hydrographic setting of the second IOC contaminants baseline cruise , 1998 .

[18]  E. Butler,et al.  Determination of arsenic species in sea-water by hydride generation atomic fluorescence spectroscopy , 1998 .

[19]  D. Mastroianni,et al.  Distribution of As, Cr and V species in the Po-Adriatic mixing area, (Italy) , 1997 .

[20]  M. Hojo,et al.  Arsenic Biogeochemistry Affected by Eutrophication in Lake Biwa, Japan , 1997 .

[21]  P. Sedwick,et al.  Iron and manganese in surface waters of the Australian subantarctic region , 1997 .

[22]  S. Wada,et al.  The Contrasting Behaviour of Arsenic and Germanium Species in Seawater , 1997 .

[23]  J. Neff.  Ecotoxicology of arsenic in the marine environment , 1997 .

[24]  Shigeru Tanaka,et al.  The Distribution of Arsenic Compounds in the Ocean: Biological Activity in the Surface Zone and Removal Processes in the Deep Zone , 1996 .

[25]  G. Millward,et al.  Methylated Arsenic in the Southern North Sea , 1996 .

[26]  L. Cutter,et al.  Behavior of dissolved antimony, arsenic, and selenium in the Atlantic Ocean , 1995 .

[27]  E. E. Antai,et al.  Arsenic Speciation and Seasonal Changes in Nutrient Availability and Micro-plankton Abundance in Southampton Water, U.K. , 1995 .

[28]  S. Wada,et al.  Distribution and cycle of arsenic compounds in the ocean , 1994 .

[29]  G. Millward,et al.  Seasonality in estuarine sources of methylated arsenic , 1993 .

[30]  J. Edmonds,et al.  Arsenic in the sea , 1993 .

[31]  T. Kaise,et al.  The Fate of Organoarsenic Compounds in Marine Ecosystems , 1992 .

[32]  M. Andreae,et al.  Refractory arsenic species in estuarine waters , 1991 .

[33]  K. Reimer,et al.  Arsenic speciation in the environment , 1989 .

[34]  O. Takimura,et al.  Effect of Various Environmental Factors on Arsenic Accumulation in Dunaliella sp. , 1989 .

[35]  S. Comber,et al.  The discovery of hidden arsenic species in coastal waters , 1989 .

[36]  W. Maher,et al.  Arsenic in the marine environment , 1988 .

[37]  H. A. van der Sloot,et al.  Arsenic, antimony and vanadium in the North Atlantic , 1988 .

[38]  J. D. Burton,et al.  Dissolved arsenic in waters of the Cape Basin , 1987 .

[39]  James G. Sanders,et al.  Control of Trace Element Toxicity by Phytoplankton , 1987 .

[40]  S. Apte,et al.  Arsenic, antimony and selenium speciation during a spring phytoplankton bloom in a closed experimental ecosystem , 1986 .

[41]  J. G. Sanders.  Alteration of arsenic transport and reactivity in coastal marine systems after biological transformation , 1986 .

[42]  M. Andreae,et al.  Arsenic, barium, germanium, tin, dimethylsulfide and nutrient biogeochemistry in Charlotte Harbor, Florida, a phosphorus-enriched estuary , 1985 .

[43]  M. Depledge,et al.  Metabolic pathways involving arsenic in marine organisms: A unifying hypothesis , 1985 .

[44]  S. Apte,et al.  The behaviour of dissolved arsenic in the estuary of the River Beaulieu , 1984 .

[45]  J. Davis,et al.  The ability of a field population of diatoms to discriminate between phosphate and arsenate , 1984 .

[46]  J. G. Sanders.  Role of Marine Phytoplankton in Determining the Chemical Speciation and Biogeochemical Cycling of Arsenic , 1983 .

[47]  John R. Jones,et al.  Factors Affecting the Relation Between Phosphorus and Chlorophyll a in Midwestern Reservoirs , 1983 .

[48]  S. Apte,et al.  Seasonal variability of biological arsenic methylation in the estuary of the River Beaulieu , 1982 .

[49]  V. M. Vidal,et al.  Arsenic metabolism in marine bacteria and yeast , 1980 .

[50]  M. Andreae.  Arsenic speciation in seawater and interstitial waters: The influence of biological‐chemical interactions on the chemistry of a trace element1 , 1979 .

[51]  M. Andreae.  Distribution and speciation of arsenic in natural waters and some marine algae , 1978 .

[52]  G. Lunde.  Occurrence and transformation of arsenic in the marine environment. , 1977, Environmental health perspectives.

[53]  S. Kanamori,et al.  On different distribution of calcium,strontium,iodine,arsenic and molybdenum in the northwestern Pacific,Indian and Antarctic Oceans. , 1962 .

[54]  Motoharu Tanaka,et al.  Spectrophotometric Microdeterntination of Arsenic in Natural Waters and its Application to Silicate and Biological Materials , 1956 .