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Hydrobiologia

, Volume 263, Issue 2, pp 95–107 | Cite as

Interspecific differences in metal bioaccumulation and plant-water concentration ratios in five aquatic bryophytes

  • J. López
  • A. Carballeira
Article

Abstract

We studied the capacity of five species of aquatic bryophyte to accumulate metals, and the relationship between plant metal content and water composition, on the basis of 170 samples taken from 32 rivers in Galicia (NW Spain). In all cases, only the final two centimetres of the apex were analysed. Scapania undulata was the species with the highest accumulatory capacity, and Fissidens polyphyllus was that with the lowest. Fontinalis antipyretica, Rhynchostegium riparioides and Brachythecium rivulare displayed intermediate capacities for metal accumulation, but showed a broader range of variation in body concentration in comparison with similar contamination levels. This resolution capacity, together with a greater resistance to pollution and, in the study region, a wider distribution and higher abundance, suggests that the latter two species are the most useful for bioindication studies. Bioaccumulation factors were high for all metals studied, tending to increase with increasing body concentration but decreasing with increasing water concentration. The relationship between metal in plant and filtrable metal in water was low, but statistically significant for all the metals studied except Co in F. antipyretica and Cd, Pb and Co in S. undulata, F. polyphllyllus and B. rivulare. The influence of physical and chemical variables of the water on bioaccumulation was evaluated using step-wise multiple correlation analysis. Bioaccumulation is largely governed by physical and chemical factors, by the concentration of metal in the water and by the bioaccumulation factor of the bryophyte species. Sulphate concentration, pH and to a lesser extent nitrite, ammonia and FRP (filtrable reactive phosphate) appear to be the most important physical and chemical variables governing metal bioavailability.

Key words

rivers metals bioaccumulation Fontinalis antipyretica Brachythecium rivulare Fissidens polyphyllus Rhynchostegium riparioides Scapania undulata 

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Copyright information

© Kluwer Academic Publishers 1993

Authors and Affiliations

  • J. López
    • 1
  • A. Carballeira
    • 1
  1. 1.Area de Ecología, Facultad de BiologíaUniversidad de Santiago de CompostelaSantiago de CompostelaSpain

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