J. G. Innes's research while affiliated with Massey University and other places

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Publications (1)

Home ranges of ship rats in a small New Zealand forest as revealed by trapping and tracking ( Rattus rattus).
  • Article

January 1983

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16 Reads

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50 Citations

New Zealand Journal of Zoology

J. G. Innes

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J. P. Skipworth

The home ranges of 5 ship rats (Rattus r. rattus L.) in a small forest area near Palmerston North were determined for 7 months by concurrent cage-trapping and smoked paper tracking. Baited tracking platforms were over 20 times as effective as cage-trapping in obtaining location data, and home ranges revealed by tracking were on average 5 times the area of trap-revealed home ranges. All the rats were to some extent cage-trap shy. However, although cage-traps could not supply useful information on range boundaries or swift acknowledgment of boundary changes, centres of activity calculated from trap data were comparable with those from tracking data. Tracking rates of individuals were variable; it would be risky to assume that they accurately reflected intensity of use of any area over short periods or when rats may have been competing for baits. The rats had stable home ranges; 3 females had ranges predominantly exclusive to each other. The progressive removal of individuals from the study area effected the prompt expansion of adjacent ranges to include vacated areas; that is, range size was inversely related to rat density.

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Citations (1)

... In a recent review, Taggart et al. (2023) called for a better understanding of how invasive animals use and move through their environment in order to design more targeted and effective conservation baiting strategies; our study directly addresses this by assessing invasive rodent activity in different forest strata. Previous studies have demonstrated that invasive rodents are capable climbers (Innes and Skipworth 1983;Shiels 2010;Foster et al. 2011;King et al. 2011), however this study I provides a more comprehensive and species-specific assessment of this behaviour, in a system where long-term ground-based baiting has occurred (~1800 bait stations in the study system). These results provide compelling evidence that rats frequently use all vertical strata across structurally variable forest types, with most of this activity attributable to black rats and, to a lesser extent, Pacific rats. ...

Reference:

Arboreal activity of invasive rodents: conservation implications for the control of an island pest
Home ranges of ship rats in a small New Zealand forest as revealed by trapping and tracking ( Rattus rattus).
  • Citing Article

  • January 1983

New Zealand Journal of Zoology

J. G. Innes

·

J. P. Skipworth