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Fig. 3.27 Down regulation of photosynthetic activity under anoxia in two wetland species that show a high tolerance ofoxygen deprivation. The leaves of the sweet flag (Acorus calamus) and the yellow flag iris (Iris pseudacorus) were able to recover most of their original photosynthetic activity after 28 days under anoxia as observed during a 10-day post-anoxic recovery period (Schluter & Crawford, 2001).

pygmaeus, Sibbaldia procumbens, Potentilla hyparctica and Saxifraga oppositifolia can survive under snow banks for one or more growing seasons (Pielou, 1994) and some can even withstand many months of total control

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