(RANKIN) of equivocation information (1-: ) and interaction information (M). The method is described in the present paper for I: and in a previous paper (Orloci, 1976) for M. The results presented in this paper suggest that for Species Rank order Information Percentage of total* species to be weighted according to their suitability to I. M I M r M characterize isolated groups of releves in a phytosociolo 5 7 54.15 2.31 17.97 0.82 gical table, the equivocation information may serve as a 9 5 49.86 23.19 16.55 8.22 3 3 9 47.79 0.56 15.86 0.20 suitable weight. The appropriate formulations are...

biological attributes of the three species according to the sequence in which they invade successively as a conse- Studies on sample plots in Halimione portulacoides com- munities show that environmental disturbances, either quence of environmental disturbance. It can therefore be concluded that for understanding this mechanism in the natural or induced by man, start a sequence of partly salt-marsh ecosystem a thorough study on the functioning overlapping density maxima in Suaeda maritima, Aster of these and other relevant biological attributes in the local tripolium and Puccinellia maritima...

Eddy V AN DER MAAREL This volume is the first of two volumes covering the Sym computer programmes for the rapid clustering and ordina posium 'Advances in vegetation science', which was held at tion of very large sets of reI eves and for (subsequent) table Nijmegen, The Netherlands, from 15-19 May 1979. This rearrangement (this volume as well as the book Data symposium was organized on behalf of the Working Group Processing in Phytosociology contain various new pro for Data-Processing of the International Society for Vege grams). What we do not have is a manual in which the tation Science....

(RANKIN) of equivocation information (1-:) and interaction information (M). The method is described in the present paper for I: and in a previous paper (Orloci, 1976) for M. The results presented in this paper suggest that for Species Rank order Information Percentage of total* species to be weighted according to their suitability to I* M I M r M characterize isolated groups of releves in a phytosociolo- 5 7 54.15 2.31 17.97 0.82 gical table, the equivocation information may serve as a 9 5 49.86 23.19 16.55 8.22 3 3 9 47.79 0.56 15.86 0.20 suitable weight. The appropriate formulations are...

Eddy V AN DER MAAREL This volume is the first of two volumes covering the Sym computer programmes for the rapid clustering and ordina posium 'Advances in vegetation science', which was held at tion of very large sets of reI eves and for (subsequent) table Nijmegen, The Netherlands, from 15-19 May 1979. This rearrangement (this volume as well as the book Data symposium was organized on behalf of the Working Group Processing in Phytosociology contain various new pro for Data-Processing of the International Society for Vege grams). What we do not have is a manual in which the tation Science....

Eddy VAN DER MAAREL All in all 16 contributions could be collected. The This volume is the second of two volumes covering the symposium 'Advances in vegetation science', which was arrangerr. ent is as follows: held at Nijmegen, The Netherlands, from 15-19 May The contribution by Sjors may serve as a general intro- duction to the types of changes and their names. The 1979. This symposium was organized on behalf of the added paper by Noble and Slatyer provides appropriate Working Group for Data-Processing of the International Society for Vegetation Science. After this group held its facts and...

July 8 -13, 1985, an international group of scientists met in Uppsala for a symposium on the subject 'Theory and models in Vegetation science' . A volume of over 70 extended abstracts had already been published in time for the symposium (Leemans et at., 1985). That volume included contributions from nearly all of those who gave talks or presented posters at the symposium. The present volume represents the fully-refereed proceedings of the symposium and features articles by a majority of speakers, plus a handful by poster authors, and two that were sent independently to Vegetatio and seemed...