Temporal patterns in the activity density and sex ratio of isopods (Oniscidea, Isopoda) along an urbanization gradient in Denmark

Abstract

Urbanization effects on terrestrial isopod (Isopoda, Oniscidea) populations were studied in forested areas along a rural-to-urban gradient including a native beech forest, suburban and urban forest fragments in Sorø, Denmark. The seasonal activity patterns of the dominating species (Oniscus asellus, Philoscia muscorum and Porcellio scaber) indicated differences among the areas, but these patterns were idiosyncratic. There were more females than males in most areas. The seasonal patterns of males and non-gravid females were similar and often bimodal; gravid females showed markedly different, usually unimodal activity patterns. Temporal changes of sex ratios were — in each species — characterized by an early summer activity peak of males, followed by the activity peak of gravid females. We suggest that these trends might indicate a reproduction-driven surface activity of males. The small response of the three isopod species to urbanization may reflect their wide ecological tolerance as well as the “soft management” of the urban park.

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Acknowledgements

We thank the support of the Sorø Akademi Stilftelse, the former Danish Institute for Agricultural Sciences, Flakkebjerg Research Center, the International School of Biodiversity Studies (ISOBIS) Aarhus, Denmark and the Hungarian Scholarship Board (ZE), Dr. H. Schmalfuss (Natural History Museum, Stuttgart) for taxonomic help, and Dr. E. Hornung (Szent István University, Budapest) for comments. This is publication no. 14 of the Danglobe Project. Author contributions: GL and ZE designed the study, and performed field sampling; ZE and FV sorted and identified the material, FV, ZE and GL made the analysis and wrote the paper.

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Vilisics, F., Elek, Z. & Lövei, G.L. Temporal patterns in the activity density and sex ratio of isopods (Oniscidea, Isopoda) along an urbanization gradient in Denmark. COMMUNITY ECOLOGY 19, 84–92 (2018). https://doi.org/10.1556/168.2018.19.1.9

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Keywords

  • Activity patterns
  • Female-dominated sex ratio
  • Seasonal activity
  • Urbanization