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Manganese as an ecological factor in salt marshes

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Abstract

The plant available manganese concentration (Mn2+) of salt-marsh sediments was compared to that of acidic and neutral soils. The mean soil-manganese concentration was higher in the top 1 cm of salt-marsh soil than in the neutral soil and comparable to that of the acidic soil (0–5 cm). A peak in the soil-manganese concentration in the upper marsh was observed one week after the spring tide but this effect was not evident in the lower marsh. Despite these differences, there was no correlation between mean manganese concentration and position on the marsh.

The response to manganese of salt-marsh halophytes was studied by measuring growth and root elongation in a range of Mn2+ concentrations with and without sodium chloride. Although there was a differential response to manganese between salt-marsh species, manganese resistance was not related to position on the marsh. Most of the species investigated were tolerant of Mn2+ at concentrations higher than normally recommended for plant growth. Moreover a salt-marsh ecotype of Festuca rubra was found to have a higher manganese resistance than an inland ecotype of the same species.

When sodium chloride was included in the growth medium, salt-marsh plants had a greatly increased resistance to manganese associated with a reduced uptake. This effect is reflected in the tissue-manganese concentration which was lower than in Deschampsia flexuosa although both groups of plants were exposed to a similar range of Mn2+ concentrations. It is concluded that sodium chloride markedly reduces the phytotoxicity of manganese in salt marshes.

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Authors and Affiliations

  1. Botany Department, Birkbeck College, University of London, Malet Street, WC1E7HX, London, U.K.

    Catherine E. Singer & D. C. Havill

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  1. Catherine E. Singer
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  2. D. C. Havill
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Additional information

Nomenclature following Clapham, Tutin & Warburg (1968). Flora of the British Isles.

The work was carried out while one of us (C. E. Singer) was in receipt of an SERC studentship, which is gratefully acknowledged.

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Singer, C.E., Havill, D.C. Manganese as an ecological factor in salt marshes. Vegetatio 62, 287–292 (1985). https://doi.org/10.1007/BF00044755

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