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Carbon and nitrogen cycling on intertidal mudflats of a temperate Australian estuary. III. Sources of organic matter

journal contribution
posted on 2023-05-16, 15:59 authored by Cook, PLM, Revill, AT, Clementson, LA, Volkman, JK
The sources and cycling of organic matter on 2 mudflats in the Huon Estuary, SE Tasmania, were investigated over 4 seasons using pigment and lipid biomarkers as well as stable isotopes of carbon and nitrogen; 1 site was in the upper estuary, 1 site was in a marine side-arm. The organic matter within the sediments at both sites was dominated by terrestrial sources, but most of this was refractory and only slowly remineralised. Significant, but seasonally variable, amounts of organic matter were derived from microphytobenthos (MPB), but this was rapidly remineralised and comprised only a minor fraction of the preserved sediment organic matter pool. Compound specific stable-isotope analysis of bacterial biomarkers suggested that the bacteria within the sediment were consuming microalgae-derived material. Separation of MPB from the sediment at the site in the upper estuary using the lens-tissue technique was found to significantly fractionate the algae community with cyanobacteria being enriched in the separated fraction. Nitrogen fixation probably contributed significantly to the growth requirements of cyanobacteria at the site in the upper estuary, as indicated by the low δ15N value of the cyanobacteria separated from the sediment.

History

Publication title

Marine Ecology Progress Series

Volume

280

Pagination

55-72

ISSN

0171-8630

Department/School

School of Natural Sciences

Publisher

Inter-research

Place of publication

Oldendorf Luhe, Germany

Repository Status

  • Restricted

Socio-economic Objectives

Other environmental management not elsewhere classified

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