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Nutrient content in macrophytes in Spanish shallow lakes

  • Margarita Fernández-Aláez
  • Camino Fernández-Aláez
  • Eloy Bécares
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Part of the Developments in Hydrobiology book series (DIHY, volume 143)

Abstract

The concentrations of N, P and C in the above-ground biomass of 14 dominant macrophyte species in shallow lakes in N.W. Spain were measured. The plants included macroalgae, aquatic (submerged and floating leaved) and emergent angiosperms. Significant differences among the species and among the groups of macrophytes were observed for the three nutrients. The macroalgae showed the lowest P (0.053% dry weight) and C (35.24% dry weight) content, whilst an impoverishment in N (1.38% dry weight) was observed in the emergent species. Only the macroalgae showed a strong association between N and P (r = 0.743, p<0.0001), reflecting an important biochemical connection in these species. A negative relation was observed between N and C (r s = −0.711, p<0.0001) as a result of the change pattern exhibited by these nutrients in the tissues of aquatic and emergent angiosperms. The existence of N limitation of growth of both angiosperm groups, with a content below critical level, was deduced. P was established as the limiting factor of all the macrophyte groups (N:P = 35:1), especially macroalgae, in which it was below the critical minimum.

Key words

nutrient accumulation macroalgae aquatic angiosperms emergent angiosperms shallow lakes 

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Copyright information

© Springer Science+Business Media Dordrecht 1999

Authors and Affiliations

  • Margarita Fernández-Aláez
    • 1
  • Camino Fernández-Aláez
    • 1
  • Eloy Bécares
    • 1
  1. 1.Department of EcologyUniversity of LeónLeónSpain

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