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Magnetite biomineralisaton in termites.

Maher, Barbara A. (1998) Magnetite biomineralisaton in termites. Proceedings of the Royal Society B: Biological Sciences, 265 (1397). pp. 733-737. ISSN 0962-8452

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Abstract

Experimental evidence exists for magnetoreception in termites, a major component of the soil macrofauna in many tropical countries. This preliminary study identifies for the first time the presence of biogenic ferrimagnets (magnetite?) in two species of termite (Nasutitermes exitiosus and Amitermes meridionalis), based on magnetic measurements of whole termite specimens and individual body sections, and analysis by electron microscopy of magnetically-extracted grains. The magnetic measurements indicate the presence of very small concentrations of magnetic material, with more magnetic grains in the thorax/abdomen region compared to the head. Magnetic interaction, due to clustering of grains, is also identified by the measurements. Analysis of magnetic extracts by transmission electron microscopy identifies the presence of uniquely ultrafine (10nm) and unidimensional grains of ferrimagnetic material, unequivocally distinct from any possible extraneous magnetite sources, such as ingested soil. Hence, this provides firm evidence for biogenic formation of this magnetic material by these two termite species. Such ultrafine grains would be superparamagnetic, ie. incapable of carrying a permanent magnetic moment, unless they were sited in clusters of interacting grains, when some remanence-carrying ability - and hence magnetotaxis - would be possible.

Item Type: Article
Journal or Publication Title: Proceedings of the Royal Society B: Biological Sciences
Uncontrolled Keywords: termites ; biogenic magnetite ; biomineralisation ; magnetotaxis ; magnetoreception
Subjects: G Geography. Anthropology. Recreation > G Geography (General)
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 352
Deposited By: Professor Barbara A Maher
Deposited On: 19 Jan 2007
Refereed?: Yes
Published?: Published
Last Modified: 07 Nov 2014 11:31
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/352

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