Polar Biology

, Volume 9, Issue 7, pp 457–460

Estimated Impact of feral house mice on sub-Antarctic invertebrates at Marion Island

Authors

  • D. T. Rowe-Rowe
    • Natal Parks Board
  • B. Green
    • CSIRO Division of Wildlife and Ecology
  • J. E. Crafford
    • Department of EntomologyUniversity of Pretoria
Article

DOI: 10.1007/BF00443233

Cite this article as:
Rowe-Rowe, D.T., Green, B. & Crafford, J.E. Polar Biol (1989) 9: 457. doi:10.1007/BF00443233

Summary

The energy metabolism of feral house mice Mus musculus was established on sub-Antarctic Marion Island, using the doubly-labelled water turnover technique. Mean water influx was 565 ml kg-1 day-1 and mean CO2 production was 5.41 ml g-1 h-1, i.e. 3375 kJ kg-1 day-1. From the energy content of the main items (Lepidoptera larvae, Curculionidae) in the diet of the mice it was estimated that the dry mass of food consumed was 3.5 g mouse-1 day-1. The overall impact of mice on invertebrates, based on mean mouse density and the mean percentage invertebrates in the diet, was estimated at 108 g ha-1 day-1 or 39.4 kg ha-1 y-1 (dry mass). Greatest predation pressure was on larvae of the flightless moth Pringleophaga marioni: 65 g ha-1 day-1 or 23.7 kg ha-1 y-1. Insect biomass is lower on Marion Island than on nearby Prince Edward Island, which is mouse-free. It is suggested that populations of certain insects on Marion Island are depressed by the alien mice.

Copyright information

© Springer-Verlag 1989