The manganese relationships of ecophysiologically contrasting earthworm species (Lumbricus rubellus and Aporrectodea caliginosa) inhabiting manganese-mine soils

Morgan, Andrew John, Pleasance, B., Kinsey, H., Murphy, Damien Martin ORCID: https://orcid.org/0000-0002-5941-4879 and Davies, Michael Stuart 2007. The manganese relationships of ecophysiologically contrasting earthworm species (Lumbricus rubellus and Aporrectodea caliginosa) inhabiting manganese-mine soils. European Journal of Soil Biology 43 (S1) , S297-S302. 10.1016/j.ejsobi.2007.08.030

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Abstract

he present study compared the patterns and efficiencies of Mn accumulation in field populations of two earthworm species (Lumbricus rubellus and Aporrectodea caliginosa) with acknowledged differences in their Ca physiologies. Moreover, electron paramagnetic resonance spectroscopy (EPR) was used to determine Mn speciation in frozen-hydrated, powdered, whole-worms tissue. Earthworms and soils were collected at nine sites in the vicinities of abandoned Mn (pyrolusite) mines. The main findings were: (i) soil Mn ranged from 9000 μg/g to 45,000 μg/g dry weight (conc. HNO3-digests) across the study sites, values exceeding the global ‘background’ soil maxima by factors from >2-fold to >11-fold; (ii) Lumbricus rubellus (epigeic species) tended to have higher tissue Mn concentrations than the endogeic, Aporrectodea caliginosa, although significant differences were only recorded at two of the seven sites where they were co-resident in sufficient numbers to allow comparisons; (iii) consistently low Mn bio-concentration factors (BCF) in earthworms (i.e., mean BCFMn for both worm species combined across all sites was 0.030) indicated strong homeostatic regulation; (iv) shallow earthworm-to-soil (‘total’ or conc. HNO3-digestible) Mn regression slopes confirmed the ability to regulate Mn; (v) Mn accumulation seemed not to be strongly influenced by soil pH, although more earthworm populations inhabiting Mn-contaminated acidic soils need to be investigated; and, (vi) EPR indicated that Mn (II) is the predominant species in earthworm tissues.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry Biosciences
Subjects:	Q Science > QD Chemistry Q Science > QH Natural history > QH301 Biology
Uncontrolled Keywords:	Earthworms; Manganese; Mine-soils; Bioaccumulation; EPR
Publisher:	Elsevier
ISSN:	1164-5563
Last Modified:	17 Oct 2022 09:53
URI:	https://orca.cardiff.ac.uk/id/eprint/6070

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