Abstract
Results of investigation of the species composition and population density of the orthopteran assemblages, performed in the Hissar Valley in 1935 and 1989 are discussed. The increased anthropogenic press resulted in the drastic changes in the assemblages during 50 years. Two species dominating in the past, Calliptamus italicus (L.) and Dociostaurus maroccanus (Thunb.), are indicators of the integrity of original assemblages (and entire ecosystems of Hissar Valley, which are now completely destroyed) or of their insignificant transformation. The recent mesomorphic assemblages are dominated by Oxya fuscovittata (Marsch.), Duroniella gracilis Uv., Chorthippus biguttulus (L.), Aiolopus thalassinus (Fabr.), and xeromorphic communities, by Calliptamus barbarus (Costa), Dociostaurus tartarus (Stshelk.), Oedipoda miniata (Pall.), and Acrotylus insubricus (Scop.). The predominance and wide distribution of these species points to a significant transformation of ecosystems and destabilization of the environment in the Hissar Valley.
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