Temporal changes in small mammal (Eulipotyphla, Rodentia) assemblages in Košice Zoo (Slovakia)

Abstract

This study summarizes 17-year results of teriological research of small mammal fauna in Košice Zoo (near the village of Kavečany, 48°47’10.04”N, 21°12’3.26”E, 380 – 420 m a.s.l.). The small mammals evaluated in this study were obtained by trapping in three periods (1992 – 1994, 2000 – 2001, 2003 – 2004) and were the results of three diploma theses. In total, 688 small mammals belonging to 13 species of four families Soricidae, Gliridae, Cricetidae and Muridae were recorded by trapping during the study period. Rodents significantly dominated with 8 species, 583 ex. (84.7%) compared to insectivores represented by 5 species, 105 ex. (15.3%). A gradual diversity decline of small mammal fauna was recorded, with only four mammal species confirmed in 2003 – 2004. This marked difference over the last 17 years was probably the result of anthropic modifications of the Zoo area, mainly the cutting of trees and shrubs of the alluvium, technical modifications of the streambeds as well as the deratization of the building areas and animal enclosures. The assemblage’s structure of captured small mammals could also be influenced by other factors, such as the predominant type of traps used, or the number of exposed traps in the vegetation and non-vegetation periods of the year. The obtained results are also a suitable basis and source of information for comprehensive and long-term monitoring in this area, given the epidemiological importance of this group of animals and the possibility of contact with exotic animals.