This study consists of an aut‐ and a synecological part. The latter is concerned with the specific environmental formations. The investigations attempt to qualitatively as well as quantitatively clarify the structures of grasshopper ecocoenoses. The formations are defined according to their morphological and vegetational structure. These formations are systematised by forming two theoretical transects, i.e. a marine and a fluviatile transect (diag. 2). In an unaffected delta these should influence all relevant formations. The defining factors — moisture and salinity — show graded values. The diverse diagrams (3–10) schematically exhibit the vegetation and grasshopperfauna of the specific formations.

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