The ecology of communities dominated by Zannichellia taxa in Western Europe. I. Characterization and autecology of the Zannichellia taxa
作者： W. Van Vierssen
DOI: 10.1016/0304-3770(82)90010-9
关键词: Germination 、 Ecology 、 Stratification (vegetation) 、 Dormancy 、 Zannichellia 、 Biology 、 Salinity 、 Shoot 、 Taxon 、 Desiccation 、 Botany 、 Plant science 、 Aquatic science
摘要: Abstract On the basis of Zannichellia material collected in Finland, Denmark, The Netherlands, W. Germany and France, three species could be distinguished: Z. palustris L., pedunculata Rchb. major Boenn. A fourth species, peltata Bertol., was found southern Europe. table with identification characteristics for these four is given. usually has 2 n = 24 chromosomes, whereas 36 chromosomes. discussed relation to tetra- hexaploid taxa. germination ecology extensively studied. By means harmonic mean day (HMGD) -index, studied chlorinity, temperature desiccation under long-day conditions dark. dormancy all seeds remarkable. It broken by a stratification period months (4°C). After germinated water salinity up 4‰ Cl′. extremely well only light. also occurred dark optimum temperatures were lower various chlorinity conditions, lowest 12‰ not damaged lasting several months. without delay. survey capacity taxa from European localities presented. Selected plants both developed best on substrates relatively high clay content. tolerances two did differ large extent. showed maximum tolerance about 8‰, 10‰. produced low number long shoots while numerous small shoots. This difference shoot production advantageous mixed populations fluctuating (rising) chlorinity.
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