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RESEARCH ARTICLE
Contents Vol 8(1)

Arsenic distribution and species in two Zostera capricorni seagrass ecosystems, New South Wales, Australia

William A. Maher A C , Simon D. Foster A , Anne M. Taylor A , Frank Krikowa A , Elliot G. Duncan A and Anthony A. Chariton B
+ Author Affiliations
- Author Affiliations

A EcoChemistry Laboratory, Institute for Applied Ecology, University of Canberra, Bruce, ACT 2601, Australia.

B CSIRO Land and Water, Private Bag 2007, Kirrawee, NSW 2232, Australia.

C Corresponding author. Email: bill.maher@canberra.edu.au

We dedicate this paper to the memory of the late Professor Kaise in recognition of his lifelong work on environmental arsenic chemistry.

Environmental Chemistry 8(1) 9-18 https://doi.org/10.1071/EN10087
Submitted: 29 July 2010  Accepted: 10 November 2010   Published: 28 February 2011

Environmental context. Arsenic concentrations and species were determined in seagrass ecosystems where the food web was established using carbon and nitrogen isotopes. There was a clear increase in the proportion of arsenobetaine in tissues of higher trophic level organisms, which is attributed to an increasing arsenobetaine content of the diet and the more efficient assimilation and retention of arsenobetaine over other arsenic species. The results provide an explanation for the prominence of arsenobetaine in higher marine animals.

Abstract. Arsenic concentrations and species were compared in biota from two Zostera capricorni ecosystems. Mean arsenic concentrations were not significantly different for non‐vegetative sediment, rhizosphere sediment, Z. capricorni blades, roots, rhizomes, epiphytes, amphipods, polychaetes, molluscs, crustaceans and fish, but were significantly different in detritus. Sediments and plant tissues contained mostly inorganic arsenic and PO4–arsenoriboside. Detritus contained mostly PO4–arsenoriboside. Fish tissues contained predominately arsenobetaine. Other animals had lower proportions of arsenobetaine and variable quantities of minor arsenic species. Bioconcentration but not biomagnification of arsenic is occurring with no evidence of arsenic hyper accumulation. The proportion of arsenobetaine increases through the food web and is attributed to a shift from a mixed diet at lower trophic levels to animals containing mostly arsenobetaine at higher trophic levels and the more efficient retention of arsenobetaine, compared to other arsenic species.

Additional keywords: arsenic occurrence, biomagnification, biotransference, C and N isotopes, food web, speciation.


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