John Gurnell | Queen Mary, University of London (original) (raw)

Papers by John Gurnell

Research paper thumbnail of Effects of trap position on the capture of woodland rodents

Journal of Zoology, Aug 20, 2009

Research paper thumbnail of Studies on the effects of bait and sampling intensity on trapping and estimating Wood mice, Apodemus sylvaticus

Research paper thumbnail of Squirrel poxvirus: Landscape scale strategies for managing disease threat

Biological Conservation, Aug 1, 2006

... the native red squirrel in these countries represent one of the best documented cases of ecol... more ... the native red squirrel in these countries represent one of the best documented cases of ecological replacement of a native species by an introduced species ( [31] , [Shorten, 1954] , [Lloyd, 1983] , [Currado et al., 1987] , [Gurnell, 1987] , [Gurnell and Pepper, 1993] , [Wauters et al ...

Research paper thumbnail of An Enrichment Device for Great Apes

Animal Welfare, Nov 1, 1992

The influence of an environmental enrichment feeding device (puzzle feeder), on activity and beha... more The influence of an environmental enrichment feeding device (puzzle feeder), on activity and behaviour patterns of captive orang-utans, gorillas and chimpanzees was studied at London Zoo. General activity levels and behaviours directed towards the feeder increased for all species when the feeder was filled with food Chimpanzees used the feeder significantly more (18% of observation periods) than either gorillas (10%) or orang-utans (9.4%). There was considerable individual variation of puzzle use by individuals within each group and time of day also affected use. In some instances abnormal behaviours were reduced. These results are discussed in relation to the management of captive great apes and it is suggested that the use of puzzle feeders can improve the welfare of these animals.

Research paper thumbnail of Releasing grey squirrels into the wild

Veterinary Record, Jun 1, 2019

Research paper thumbnail of Inter-trap movement and estimating rodent densities

Journal of Zoology, Feb 1, 1989

The area and inter–trap distance of small mammal live trapping grids can seriously influence obse... more 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, Clethrionomys 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.

Research paper thumbnail of Release into the wild of grey squirrels

Research paper thumbnail of Genetic diversity among fragmented populations of red squirrel: a preliminary study

Research paper thumbnail of Observations on trap response in confined populations of Wood mice, Apodemus sylvaticus

Journal of Zoology, Aug 20, 2009

Three laboratory studies of trap response in confined Wood mouse populations at various densities... more Three laboratory studies of trap response in confined Wood mouse populations at various densities and using various densities of traps are described. Individual variation in trap response and whether captures were made at random are examined, and factors which affect trap response in confined populations of mice are discussed.

Research paper thumbnail of The changing patterns in the distribution of red and grey squirrels in the North of England and Scotland between 1991 and 2010 based on volunteer surveys

Hystrix-italian Journal of Mammalogy, Nov 3, 2014

Research paper thumbnail of Understanding processes of island development on an island braided river over timescales from days to decades

Earth Surface Processes and Landforms, Oct 29, 2018

Research paper thumbnail of Genetic structure of fragmented populations of red squirrel (Sciurus vulgaris) in the UK

Molecular Ecology, Dec 1, 1999

... First, because of the large number of alleles found in red squirrel populations, which may be... more ... First, because of the large number of alleles found in red squirrel populations, which may be produced as a result of a combination of their rapid ... Under these circumstances it is very easy to see how subdividing the Bavarian population into small fragments would create this ...

Research paper thumbnail of Interspecific effects of grey squirrels ( <i>Sciurus carolinensis</i> ) on the space use and population demography of red squirrels ( <i>Sciurus vulgaris</i> ) in conifer plantations

Ecological Research, Sep 1, 2000

Research paper thumbnail of Squirrel numbers and the abundance of tree seeds

Mammal Review, Jun 1, 1983

This is a literature review of the relationship between the abundance of tree seeds and the produ... more This is a literature review of the relationship between the abundance of tree seeds and the productivity, survival and dispersal of Holarctic tree squirrels. Causal links between changes in tree seed supplies and changes in squirrel numbers are often masked by various factors including intraspecifk and interspecific competition for seed, weather, predation and seed hoarding; density‐dependent relationships have not been clearly established. Tamiasciurus and Sciurus species have different seed‐hoarding strategies which are associated with differences in their social and spatial organization. Average squirrel densities in the long‐term are discussed in relation to forest habitat type, and directions for future research indicated.

Research paper thumbnail of Managing forests for red squirrels

... PWW, RUSHTON, SP, WAUTERS, LA, BERTOLINO, S., CURRADO, I., MAZZOGLIO, P. and SHIRLEY, MDF (20... more ... PWW, RUSHTON, SP, WAUTERS, LA, BERTOLINO, S., CURRADO, I., MAZZOGLIO, P. and SHIRLEY, MDF (2001). Predicting grey squirrel expansion in North Italy: a spatially explicit modelling approach. Landscape Ecology 16, 407–420. LURZ, PWW, GEDDES, N., LLOYD, AJ ...

Research paper thumbnail of Interactions between native and invasive species: A systematic review of the red squirrel-gray squirrel paradigm

Frontiers in Ecology and Evolution, Mar 31, 2023

Research paper thumbnail of Grey squirrel damage to broadleaf woodland in the New Forest: a study on the effects of control

Quarterly Journal of Forestry, 1998

Research paper thumbnail of Trap deaths in woodland rodents

Acta Theriologica, Jul 12, 1982

Research paper thumbnail of Scent‐marking behaviour by stallions: an assessment of function in a reintroduced population of Przewalski horses ( <i>Equus ferus przewalskii</i> )

Journal of Zoology, Nov 29, 2006

Research paper thumbnail of Modeling Impacts and Costs of Gray Squirrel Control Regimes on the Viability of Red Squirrel Populations

Journal of Wildlife Management, Jul 1, 2002

... United Kingdom PETER WW LURZ, Centre for Life Sciences Modelling, University of Newcastle upo... more ... United Kingdom PETER WW LURZ, Centre for Life Sciences Modelling, University of Newcastle upon Tyne, NE1 7RU, United Kingdom ROBIN M. FULLER ... is a subject of conservation concern because it has been declining in the UK for over 50 years (Gurnell and Pepper 1993). ...

Research paper thumbnail of Effects of trap position on the capture of woodland rodents

Journal of Zoology, Aug 20, 2009

Research paper thumbnail of Studies on the effects of bait and sampling intensity on trapping and estimating Wood mice, Apodemus sylvaticus

Research paper thumbnail of Squirrel poxvirus: Landscape scale strategies for managing disease threat

Biological Conservation, Aug 1, 2006

... the native red squirrel in these countries represent one of the best documented cases of ecol... more ... the native red squirrel in these countries represent one of the best documented cases of ecological replacement of a native species by an introduced species ( [31] , [Shorten, 1954] , [Lloyd, 1983] , [Currado et al., 1987] , [Gurnell, 1987] , [Gurnell and Pepper, 1993] , [Wauters et al ...

Research paper thumbnail of An Enrichment Device for Great Apes

Animal Welfare, Nov 1, 1992

The influence of an environmental enrichment feeding device (puzzle feeder), on activity and beha... more The influence of an environmental enrichment feeding device (puzzle feeder), on activity and behaviour patterns of captive orang-utans, gorillas and chimpanzees was studied at London Zoo. General activity levels and behaviours directed towards the feeder increased for all species when the feeder was filled with food Chimpanzees used the feeder significantly more (18% of observation periods) than either gorillas (10%) or orang-utans (9.4%). There was considerable individual variation of puzzle use by individuals within each group and time of day also affected use. In some instances abnormal behaviours were reduced. These results are discussed in relation to the management of captive great apes and it is suggested that the use of puzzle feeders can improve the welfare of these animals.

Research paper thumbnail of Releasing grey squirrels into the wild

Veterinary Record, Jun 1, 2019

Research paper thumbnail of Inter-trap movement and estimating rodent densities

Journal of Zoology, Feb 1, 1989

The area and inter–trap distance of small mammal live trapping grids can seriously influence obse... more 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, Clethrionomys 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.

Research paper thumbnail of Release into the wild of grey squirrels

Research paper thumbnail of Genetic diversity among fragmented populations of red squirrel: a preliminary study

Research paper thumbnail of Observations on trap response in confined populations of Wood mice, Apodemus sylvaticus

Journal of Zoology, Aug 20, 2009

Three laboratory studies of trap response in confined Wood mouse populations at various densities... more Three laboratory studies of trap response in confined Wood mouse populations at various densities and using various densities of traps are described. Individual variation in trap response and whether captures were made at random are examined, and factors which affect trap response in confined populations of mice are discussed.

Research paper thumbnail of The changing patterns in the distribution of red and grey squirrels in the North of England and Scotland between 1991 and 2010 based on volunteer surveys

Hystrix-italian Journal of Mammalogy, Nov 3, 2014

Research paper thumbnail of Understanding processes of island development on an island braided river over timescales from days to decades

Earth Surface Processes and Landforms, Oct 29, 2018

Research paper thumbnail of Genetic structure of fragmented populations of red squirrel (Sciurus vulgaris) in the UK

Molecular Ecology, Dec 1, 1999

... First, because of the large number of alleles found in red squirrel populations, which may be... more ... First, because of the large number of alleles found in red squirrel populations, which may be produced as a result of a combination of their rapid ... Under these circumstances it is very easy to see how subdividing the Bavarian population into small fragments would create this ...

Research paper thumbnail of Interspecific effects of grey squirrels ( <i>Sciurus carolinensis</i> ) on the space use and population demography of red squirrels ( <i>Sciurus vulgaris</i> ) in conifer plantations

Ecological Research, Sep 1, 2000

Research paper thumbnail of Squirrel numbers and the abundance of tree seeds

Mammal Review, Jun 1, 1983

This is a literature review of the relationship between the abundance of tree seeds and the produ... more This is a literature review of the relationship between the abundance of tree seeds and the productivity, survival and dispersal of Holarctic tree squirrels. Causal links between changes in tree seed supplies and changes in squirrel numbers are often masked by various factors including intraspecifk and interspecific competition for seed, weather, predation and seed hoarding; density‐dependent relationships have not been clearly established. Tamiasciurus and Sciurus species have different seed‐hoarding strategies which are associated with differences in their social and spatial organization. Average squirrel densities in the long‐term are discussed in relation to forest habitat type, and directions for future research indicated.

Research paper thumbnail of Managing forests for red squirrels

... PWW, RUSHTON, SP, WAUTERS, LA, BERTOLINO, S., CURRADO, I., MAZZOGLIO, P. and SHIRLEY, MDF (20... more ... PWW, RUSHTON, SP, WAUTERS, LA, BERTOLINO, S., CURRADO, I., MAZZOGLIO, P. and SHIRLEY, MDF (2001). Predicting grey squirrel expansion in North Italy: a spatially explicit modelling approach. Landscape Ecology 16, 407–420. LURZ, PWW, GEDDES, N., LLOYD, AJ ...

Research paper thumbnail of Interactions between native and invasive species: A systematic review of the red squirrel-gray squirrel paradigm

Frontiers in Ecology and Evolution, Mar 31, 2023

Research paper thumbnail of Grey squirrel damage to broadleaf woodland in the New Forest: a study on the effects of control

Quarterly Journal of Forestry, 1998

Research paper thumbnail of Trap deaths in woodland rodents

Acta Theriologica, Jul 12, 1982

Research paper thumbnail of Scent‐marking behaviour by stallions: an assessment of function in a reintroduced population of Przewalski horses ( <i>Equus ferus przewalskii</i> )

Journal of Zoology, Nov 29, 2006

Research paper thumbnail of Modeling Impacts and Costs of Gray Squirrel Control Regimes on the Viability of Red Squirrel Populations

Journal of Wildlife Management, Jul 1, 2002

... United Kingdom PETER WW LURZ, Centre for Life Sciences Modelling, University of Newcastle upo... more ... United Kingdom PETER WW LURZ, Centre for Life Sciences Modelling, University of Newcastle upon Tyne, NE1 7RU, United Kingdom ROBIN M. FULLER ... is a subject of conservation concern because it has been declining in the UK for over 50 years (Gurnell and Pepper 1993). ...