Trap response in woodland rodents

Gurnell, John

doi:10.4098/at.arch.82-10

Cited by 9 publications

(14 citation statements)

References 31 publications

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“…This certainly seems likely in the case of female bank voles when traps,are spaced more than 10 m apart. In a previous analysis, bank voles, especially unmarked animals, have been shown to have considerably lower trappabilities than wood mice (Gurnell, 1982).…”

Section: Discussionmentioning

confidence: 87%

Inter–trap movement and estimating rodent densities

Gurnell

Gipps

1989

Journal of Zoology

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With 2 figures in the text)The area and inter-trap distance of small mammal live trapping grids can seriously influence observed movement patterns and estimates of animal densities. This paper examines inter-trap movement (ITM) according to inter-trap distance, time of the year, weather and numbers captured for the wood mouse, Apodemus sylvaticus, and the bank vole, Clethrionornys glareolus, in an oak wood in southern England. The analysis is based on live trapping data collected in three studies over an eight-year period. Trap spacing affected inter-trap movement, including the statistic, 'Mean Distance Moved' between successive captures (MDM), of different species and sexes of rodents in different and predictable ways. No association was found in MDM between males and females of the same species, MDM and time of the year or MDM and weather. However, there was a weak negative association between MDM and numbers captured, particularly in mice. Using an independent method of assessing effective grid area, the usefulness of the MDM in correcting grid areas for the estimation of animal densities is discussed.

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Section: Discussionmentioning

confidence: 87%

Inter–trap movement and estimating rodent densities

Gurnell

Gipps

1989

Journal of Zoology

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“…Full details of the study area and trapping methods are given in Gurnell (1982). In short, 55 trapping periods, each consisting of 3 or 4 trapping nights, were carried out in a mature oak (Quercus robur) woodland in Alice Holt Forest, Surrey, England between June 1975 and June 1980.…”

Section: Methodsmentioning

confidence: 99%

“…In short, 55 trapping periods, each consisting of 3 or 4 trapping nights, were carried out in a mature oak (Quercus robur) woodland in Alice Holt Forest, Surrey, England between June 1975 and June 1980. The standard trapping procedure was to place 144 Longworth live traps two to a point on a 10 m. spaced grid consisting of 8 rows by 9 columns, although some minor variations to this procedure were sometimes adopted (Gurnell, 1982). The traps contained hay bedding and whole oats, and oats were used as bait.…”

Section: Methodsmentioning

confidence: 99%

Trap deaths in woodland rodents

Gurnell¹

1982

Acta Theriol.

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“…(3) Sample time was short in comparison to total experiment time because we only trapped three days a month. (4) It is well known that small rodents can become trap-happy (Gurnell 1982) and we observed some events of trap-happiness of rodents that probably had or built their burrow next to a trap. But this effect was limited: a goodness-of-fit test (bootstrap: White and Burnham 1999) on each starting model indicated that sex and time factors are sufficient to obtain groups with homogeneous demographic parameters for each species on both grid sizes (p > 0.2 for each of the 4 data sets).…”

Section: Resultsmentioning

confidence: 83%

Can demographic parameters be estimated from capture-recapture data on small grids? A test with forest rodents

2002

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N. 2002. Can demographic parameters be estimated from capture-recapture data on small grids? A test with forest rodents. Acta Theriologica 47: 323-332.This preliminary study proposes small trapping grids as an alternative to traditional large grids for the simultaneous monitoring of several rodent populations by capture--recapture. Monthly trapping sessions of wood mouse Apodemus sylvaticus (Linnaeus, 1758) and bank vole Clethrionomys glareolus (Schreber, 1780) were carried on over a small area (0.015 ha, 21 traps). The coherence of demographic parameter estimates on such small grids with those obtained on classical large grids was checked by performing two trapping sessions on a larger grid (0.9 ha, 110 traps, 10 m mesh) surrounding the small grid. We compared the two grid designs on the basis of sex ratio upon first capture, trap saturation rate, minimum number alive (MNA), monthly survival, and trappability. These demographic parameters proved to be non-biased by the trapped area, even though the precision was lower on the small grid. Small grids seem therefore to give the same picture of population dynamics as classical large grids except for parameters sensitive to an edge effect (eg density). By decreasing significantly the trapping effort, small grids will be of particular interest whenever the simultaneous operation of several trapping grids is needed (eg to compare different environmental conditions).

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Trap response in woodland rodents

Cited by 9 publications

References 31 publications

Inter–trap movement and estimating rodent densities

Inter–trap movement and estimating rodent densities

Trap deaths in woodland rodents

Can demographic parameters be estimated from capture-recapture data on small grids? A test with forest rodents

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