By Eddy van der Maarel (auth.), Eddy van der Maarel, Marinus J. A. Werger (eds.)

biological attributes of the 3 species in line with the series during which they invade successively as a conse­ reviews on pattern plots in Halimione portulacoides com­ munities exhibit that environmental disturbances, both quence of environmental disturbance. it may possibly for that reason be concluded that for knowing this mechanism within the traditional or prompted by way of guy, commence a series of in part salt-marsh surroundings a radical research at the functioning overlapping density maxima in Suaeda maritima, Aster of those and different appropriate organic attributes within the neighborhood tripolium and Puccinellia maritima successively, ahead of the populations is key. unique Halimione neighborhood completely recovers. while Returning to the elemental questions installed the advent succession time ahead of improving is lengthy sufficient, there are it really is concluded that: trends in redundancy of this series stressing the unilinear personality of the succession. Minor environmental a) There exist orderly and predictable succession styles within the investigated salt-marsh plants. affects set off an extended time-lag interval of the Suaeda b) Following occasional disturbances, no matter what those could density greatest, suggesting threshold values of those affects for the species to keep up minimum inhabitants be, the crops recovers through a series of overlapping intervening time species populations exhibiting a unilinear or obliga­ densities or to develop into in the community extinct. This series of tory (Hom 1976) succession pattern.

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Ohne an dieser Stelle in die Einzelheiten dieses Vergleichs eingehen zu wollen - in der Diskussion soli dies nachgeholt werden - mochten wir hier einige Bemerkungen anbringen. Die heiden von Zoller (1954) beschriebenen X erobromion-Gesellschaften, das Teucrio-Xerobrometum (Nr. 26) und das CerastioXerobrometum (Nr. 27) weisen bei dieser Vergleichsmethode nicht etwa die engste Verkniipfung untereinander, also im selben Verband auf, sondern sind enger mit der Diplachnion-Gesellschaft Nr. 4 (lschaemo-Diplachnetum) bzw.

The kind of problem can be illustrated as follows using Icelandic data. d Galium pumilum Mull. Outhern limits. >ciated "'ith the tTl0ntane-oceanic areas of the north and west. Only Galium pumilum does not fit and on cher;king the specimens it was found to be misnamed in the flora used. In fact the species was Galium normanii O. C. Dabl, an Icelandic endemic apa,t from two Norwegian records. iarity to be exposed, and even suggests where to look fo: Galium normanj in Britain. The problem of course IS how to program a machine to associate these disr-arate sources of information into a coherent interprl',ation, and still more how to make it learn the appropriate information.

Sehr deutIich kommt aber auch zum Ausdruck, dass das Carici humilis-Chrysopogonetum grylli bei dieser Vergleichsart eine zentrale Stellung einnimmt und zu nahezu allen Vergleichsverbiinden eine bestmogliche Beziehung aufweist. Daraus wird auch ein Nachteil dieser Methode ersichtlich: Vergleichseinheiten, welche eine hohe Anzahl Arten aufweisen, werden mit einer grosseren Wahrscheinlichkeit die korrespondierenden Arten in Vergleichseinheiten mit niedriger Artenzahl vorfinden als umgekehrt. h. rund doppelt soviele Arten aufweist wie die iibrigen Einheiten, ist dessen zentrale Stellung verstiindlich.

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