Original paper

Trockenrasen im pannonischen Raum: Zusammenhang der physiognomischen Struktur und der floristischen Komposition mit den Insektenzönosen

Varga, Zoltán

Phytocoenologia Band 27 Heft 4 (1997), p. 509 - 571

100 references

published: Dec 16, 1997

DOI: 10.1127/phyto/27/1997/509

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ArtNo. ESP024002704002, Price: 29.00 €

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Abstract

Dry grasslands of the Pannonian lowland: loess, sand and alkali grasslands and semi-dry grasslands of the hilly areas of the Aggtelek karst are compared. Floristical and life-form composition, physiognomical structure are considered in connection to two dominant phytophagous insect groups. The microclimatically sensible, but trophically not specialized Orthoptera-assemblages reflect mostly the physiognomical structure of vegetation. They proved as good indicators of structural changes of vegetation based on quantitative relations of their well-defined life-form types. Because they are relatively unsensible on smaller-scale heterogeneities of their environment, their assemblages can be easily parallelized with the plant associations. Butterflies are often food-plant specialized, thus their resources regularly display a patchy pattern. Hence, their meta-populations often cover a larger area which can be characterized by smaller spots of larval food-plants, stands of nectar-sources and also by a landscape-scale structure of sigma-associations. It means that they do not have a well-defined indicative value as a community, but "individually" several species can be regarded as "keystone species" of large-scale spatial patterns of vegetation.

Keywords

loesssandalkali and semi-dry grasslandsfloristic composition and structureOrthoptera-assemblagesbutterfly-assemblageskeystone apecies