Marine and Freshwater Research Marine and Freshwater Research Society
Advances in the aquatic sciences
RESEARCH ARTICLE

A rod-like bacterium is responsible for high molybdenum concentrations in the tropical sponge Halichondria phakellioides

Constanza Buccella A , Belinda Alvarez A B , Karen Gibb A and Anna Padovan A C
+ Author Affiliations
- Author Affiliations

A Research Institute for the Environment and Livelihoods, Charles Darwin University, Darwin, NT 0909, Australia.

B Museum and Art Gallery of the Northern Territory, Darwin, NT 0801, Australia.

C Corresponding author. Email: anna.padovan@cdu.edu.au

Marine and Freshwater Research 65(9) 838-848 https://doi.org/10.1071/MF13254
Submitted: 19 September 2013  Accepted: 12 December 2013   Published: 4 July 2014

Abstract

The tropical marine sponge, Halichondria phakellioides, from Darwin Harbour contains high concentrations of molybdenum. A rod-like bacterium extracellular in sponge tissue was observed using transmission electron microscopy. Molybdenum was located within these bacteria, but not in sponge cells. This is the first report of the trace element molybdenum localised in a sponge bacterial symbiont. Many different bacterial symbionts were identified in the sponge by sequence analysis so the identity of the molybdenum-accumulating bacterium could only be inferred.

Additional keywords: pyrosequencing, X-ray microanalysis.


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