Mots-clés : écologie statistique, analyse triadique partielle, AFC de FOUCART, série de tables de contingence, compromis, stabilité, espace, temps, structure des communautés. STUDY OF THE TEMPORAL STABILITY OF SPATIAL STRUCTURES BY ANALYSING SERIES OF TOTALLY PAIRED FAUNISTIC TABLES. ABSTRACTIn this paper, we investigate the potential of partial triadic analysis (PTA), already introduced in ecology by THIOULOUSE and CHESSEL (1987). we also present the analysis of a series of contingency tables (FOUCART, 1978) which represents a different approach since it considers the frequency distribution of species rather than their abundance. We illustrate these two K-set methods by an example in stream ecology. We demonstrate the power of these methods for depicting the temporal evolution of the spatial structures.

(THIOULOUSE et CHESSEL, 1987 ;BLANC et al., 1998) et l'Analyse Factorielle des Correspondances de FOUCART (1978, 1983. Quelle que soit la méthode utilisée, une structure spatiale espèces-stations commune aux différentes dates a été mise en évidence. La première oppose principalement des stations à truite aux stations à cyprinidés et révèle un double effet de régionalisation. La deuxième a mis en évidence une structure amont-aval proche de celles des schémas ichtyologiques de référence (HUET, 1954 ;VERNEAUX, 1973VERNEAUX, , 1981. L'étude temporelle des structures autour de la structure moyenne a montré une forte stabilité durant la période étudiée.Mots-clés : poissons, analyse triadique partielle, AFC de FOUCART, évolution temporelle, région méditerranéenne. The species-station-date data set was analysed using two K-tables (4 dates) statistical methods : Partial Triadic Analysis (THIOULOUSE and CHESSEL, 1987 ;BLANC et al., 1998) and series of contingency tables (FOUCART, 1978(FOUCART, , 1983. With both methods, results suggested that there was a common spatial structure for all dates of sampling. The first method revealed an opposition between stations characterized by trout and stations Article available at http://www.kmae-journal.org or http://dx.doi.org/10.1051/kmae:1998050 TEMPORAL STABILITY OF SPATIAL STRUCTURES OF FISH COMMUNITY IN LANGUEDOC-ROUSSILLON AND PROVENCE-ALPES-CÔTE D'AZUR REGIONS. ABSTRACTBull. Fr. Pêche Piscic. (1998) 348 : 23-45 -24 -where Cyprinidae species were dominant. The second method highlighted an upstreamdownstream structure of fish community similar to those considered as references (HUET, 1954 ;VERNEAUX, 1973VERNEAUX, , 1981. The analysis of temporal variation around the compromise structure showed that fish assemblages were stable over the studied period.

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