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Null hypothesis in studies on plant communities ii. assemblages of species of the genus luzula



Null hypothesis in studies on plant communities ii. assemblages of species of the genus luzula



Ekologia polska 36(3-4): 485-508



On the basis of 8012 releves the co-occurrence of 10 species of the genus Luzula growing in Poland has been analysed. Null hypothesis about the lack of biotic interactions among species discussed was falsified. Altogether 25 null models were examined. In the case of some models, results obtained suggest that for binary data the composition of particular combinations of Luzula species and their occurrence frequencies may be explained sufficiently with the help of habitat factors and the assumption of an independent (= random) disperson of unequiprobable species. [The following species are discussed: L. pilosa, L. multiflora, L. campestris, L. nemorosa, L. sylvatica, L. flavescens, L. spadicea, L. sudetica, L. pallescens, L. spicata].

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