ISSN:
1573-5117
Keywords:
nutrient accumulation
;
macroalgae
;
aquatic angiosperms
;
emergent angiosperms
;
shallow lakes
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1017030429717
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