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1 2007

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Did the northern range of distribution of two tropical orthopterans (Insecta) change recently?

Kristin A., Kanuch P., Sarossy M.

Polish Journal of Ecology

2007

Vol. 55, nr 2

297-304

Many thermophilous species are predicted to shift their ranges to higher latitudes and altitudes in response to climate warming. The range trend was analysed for two orthopteran species Ruspolia nitidula (Scopoli, 1786) and Aiolopus thalassinus (Fabricius, 1781) of tropical origin at their northern limits. Their northern range seems to have been stable for more than 100 years irrespective that they are good fliers and in spite of a rapid increase of records within their northern range supported by hard data. In 2000-2006, the authors found R. nitidula on 87 localities (only 19 had been known before 2000) and A. thalassinus on 35 localities (9 before 2000) in Slovakia. The authors consider that this increase of records is more due to intensified mapping, and it does not support the hypothesis that the global warming affects the spreading of the species. For both these endangered thermo-hygrophilous species, habitat choice, population dynamics, phenology, threats and conservation aspects were analysed and discussed in the context of their main ranges.