**The Impact of Climate Variations on the Structure of Ground Beetle (Coleoptera: Carabidae) Assemblage in Forests and Wetlands**

**Marina Kirichenko-Babko 1,\* , Yaroslav Danko <sup>2</sup> , Anna Musz-Pomorksa <sup>3</sup> , Marcin K. Widomski <sup>3</sup> and Roman Babko <sup>1</sup>**


Received: 20 August 2020; Accepted: 6 October 2020; Published: 8 October 2020

**Abstract:** We studied the effect of climate variations on the structure of the assemblage of ground beetles (Coleoptera: Carabidae) in a wetland and surrounding watershed forest. We analyzed the changes in the structure of the assemblage of ground beetles provoked by a two-year dry period against the background of studies carried out during the two-year wet period. Aridization influenced the structure of the assemblage of ground beetles more in wetlands than in forests. It was shown that despite the stabilizing effect of the forest on the structure of assemblages of terrestrial arthropods, the two-year dry period had a negative impact on the assemblage of ground beetles in the studied area. The Simpson dominance index of 4.9 during the wet season increased to 7.2 during the drought period. Although the total number of species during the dry period did not significantly decrease in comparison with the wet period—from 30 to 27 species—changes occurred in the trophic structure: during the drought period, the number of predators decreased. It is concluded that the resistance of forest habitats to climate aridization is somewhat exaggerated and, very likely, the structure of the community of arthropods in forests will change significantly.

**Keywords:** humid forest; habitat quality; soil moisture; aridization; Carabidae; species distribution
