Comparison of predation by two suburban cats in New Zealand

Authors

  • John E.C. Flux

DOI:

https://doi.org/10.1515/eje-2017-0009

Keywords:

domestic cat, Felis catus, birds, rodents, rabbits, mustelids, predation

Abstract

To study the effects domestic cats may have on surrounding wildlife, a complete list was made of 558 items caught in the garden or brought into the house by one cat over 17 years, from 1988 to 2005. The effect on prey populations was assessed by comparing their abundance with the previous 15 years’ population without a cat. On balance, this cat (Cat 1) was clearly beneficial to the native bird species by killing rodents and deterring mustelids. The diet of a second cat (Cat 2) was recorded in the same way from 2006 to 2016. This cat caught half the number of items 148:287, but in the same proportions: house mice (37.8:42.6); ship rats (12.8:12.1); European rabbits (all young) (8.1:6.7); weasels (0.7:0.4); dunnock (12.8:9.2); house sparrow (2.0:3.1); blackbird (2.7:2.5); song thrush (1.4:1.3); European greenfinch (0.7:5.8); chaffinch (0.7:3.3); silvereye (10.1:8.3); New Zealand fantail (2.0:1.0); lizards (8.1:1.7). Despite this, there were significant differences: Cat 2 avoided finches (2:28, P = 0.004), and took a few more lizards (12:5). For both cats, birds apparently formed about a third of their diet: 33.4% and 34.5%, but comparison of the proportion of birds and rodents brought into the house (12:92) and found dead away from the house (49:45) implies that 320 rodent kills may have been missed, being far more difficult to find. As top predators, these cats were clearly beneficial to native birds, and proposed control or elimination may precipitate mesopredator release and a rabbit problem.

References

Baker, P.J., Molony, S.E., Stone, E., Cuthill, I.C. & Harris, S. (2008) Cats
about town: is predation by free-ranging pet cats Felis catus
likely to affect urban bird populations? Ibis, 150, 86–99.
Bergstrom, D.M., Lucieer, A., Kiefer, K., Wasley, J., Belbin, L., Pedersen,
T.K. & Chown, S.L. (2009) Indirect effects of invasive species removal
devastate World Heritage island. Journal of Applied Ecology,
46, 73–81.
Blancher, P. (2013) Estimated number of birds killed by house cats (Felis
catus) in Canada. Avian Conservation and Ecology, 8(2), 3.
http://dx.doi.org/10.5751/ACE-00557-080203
Bracey, A.M., Etterson, M.A., Niemi, G.J. & Green, R.F. (2016) Variation
in bird-window collision mortality and scavenging rates within
an urban landscape. The Wilson Journal of Ornithology, 128,
355–367.
Bradt, G.W. (1949) Farm cat as predator. Michigan Conservation, 18,
23–25.
Brockie, B. (2001) When cats away the rats will play. The Dominion,
Wellington, 22 October 2001.
Calvert, A.M., Bishop, C.A., Elliot, R.D., Krebs, E.A., Kydd, T.M., Machtans,
C.S. & Robertson, G.J. (2013) A synthesis of human-related avian
mortality in Canada. Avian Conservation and Ecology, 8(2), 11.
http://dx.doi.org/10.5751/ACE-00581-080211
Churcher, P.B. & Lawton, J.H. (1987) Predation by domestic cats in an
English village. Journal of Zoology, 212, 439–455. http://dx.doi.
org/10.1111/j.1469-7998.tb02915.x
Doherty, T.S., Glen, A.S., Nimmo, D.G., Ritchie, E.G. & Dickman, C.R.
(2016) Invasive predators and global biodiversity loss. Proceedings
of the National Academy of Sciences, 113, 11261–11265.
Doherty, T.S. & Ritchy, E.G. (2017) Stop jumping the gun: a call for evidence-
based invasive predator management. Conservation Letters,
10, 15–22.
Efford, M.G., Fitzgerald, B.M., Karl, B.J. & Berben, P.H. (2006) Population
dynamics of the ship rat Rattus rattus L. in the Orongorongo Valley,
New Zealand. New Zealand Journal of Zoology, 33, 273–297.
Fitzgerald, B.M. & Karl, B.J. (1979) Foods of feral house cats (Felis catus
L.) in forest of the Orongorongo Valley, Wellington. New Zealand
Journal of Zoology, 6, 107–126.
Flux, J.E.C. (1999) Status, ecology, and control by predators of rabbits
and hares in New Zealand. Proceedings of the Rabbit Control,
RCD: Dilemmas and Implications Conference (30-31 March
1999, Wellington, New Zealand), Royal Society of New Zealand
Miscellaneous Series, 55, 4–9.
Flux, J.E.C. (2007) Seventeen years of predation by one suburban cat
in New Zealand. New Zealand Journal of Zoology, 34, 289–296.
Flux, J. (2017) The deadly road-kill cycle. Ecological Society of New Zealand
Newsletter. 159, 2.
Forbush, E.H. (1916) The domestic cat: bird killer, mouser and destroyer
of wildlife: means of utilizing and controlling it. Boston: Wright
& Potter. 112 pp.
Gaby, M.J. (2014) A report on free-roaming domestic cat activities in urban
areas: what do owned free-ranging domestic cats get up to?
Research project, School of Geography, Environment and Earth
Sciences. Victoria University of Wellington, New Zealand.
Gibb, J.A. & Fitzgerald, B.M. (1998) Dynamics of sparse rabbits (Oryctolagus
cuniculus), Orongorongo Valley, New Zealand. New Zealand
Journal of Zoology, 25, 231–243.
Gillies, C. & Cutler, A. (2001) A trial of the liberator, leap activated, audio
visual alarm collar for cats for wildlife protection in Wellington,
New Zealand. Unpublished report to The Royal Forest & Bird
Protection Society, Wellington, New Zealand. 31 pp.
Gillies, C. & Fitzgerald, B.M. (2005) Feral cat. In: C.M. King (Ed.), The
handbook of New Zealand mammals pp. 308–326. Auckland:
Oxford University Press.
Kauhala, K., Talvitie, K. & Vuorisalo, T. (2015) Free-ranging house cats in
urban and rural areas in the north: Useful rodent killers or harmful
bird predators? Folia Zoologica, 64, 45–55.
Kays, R.W. & DeWan A.A. (2004) Ecological impact of inside/outside
house cats around a suburban nature preserve. Animal Conservation,
7, 273–283.
King, C.M., Flux, M., Innes, J.G. & Fitzgerald, B.M. (1996) Population
biology of small mammals in Pureors Forest Park: 1. Carnivores
(Mustela erminea, M. furo, M. nivalis, and Felis catus). New Zealand
Journal of Ecology, 20, 241–251.
Krauze-Gryz, D., Gryz, J. & Goszczynski, J. (2012) Predation by domestic
cats in rural areas of central Poland: an assessment based on
two methods. Journal of Zoology, 288, 260–266.
Linklater, W. (2013) There is never only one cat... Retrieved from http://
sciblogs.co.nz/politecol/2013/12/07
Lanszki, J., Kletecki, E., Trocsanyi, B., Muzinic, J., Szeles, G.L. & Purger,
J.J. (2016) Feeding habits of house and feral cats (Felis catus) on
small Adriatic islands (Croatia). North-Western Journal of Zoology,
12, 336–348.
Loss, S.R., Will, T. & Marra, P.P. (2012) Direct human-caused mortality
of birds: improving quantification of magnitude and assessment of population impact. Frontiers in Ecology and the Environment,
10, 357–364.
Loyd, K.A., Hernandes, S.M., Carrol, J.P., Abernathy, K.J. & Marshal. G.J.
(2013) Quantifying free-roaming domestic cat predation using
animal-borne video cameras. Biological Conservation, 160,
183–189.
Marra, P.P. & Santella, C. (2016) Cat wars: the devastating consequences
of a cuddly killer. Princeton and Oxford: Princeton University
Press. 212 pp.
Medina, F.M., Bonnaud, E., Vidal, E., Tershy, B.R., Zavaleta, E.S., Donlan,
C.J. Et al. (2011) A global review of the impacts of invasive cats
on island endangered vertebrates. Global Change Biology, 17,
3503–3510. http://doi:10.1111/j.1365-2486.2011.02464.x
Metsers, E.M., Seddon, P.J. & van Heezik, Y.M. (2010) Cat-exclusion
zones in rural and urban-fringe landscapes: how large would
they have to be? Wildlife Research, 37, 47–56.
Mudge, D. (2002) Silence of the fantails. New Zealand Geographic, 55,
70–86.
Owens, B. (2017) The big cull. Nature, 541, 148–150.
Slater, F.M. (2002) An assessment of wildlife road casualties - the potential
discrepancy between numbers counted and numbers killed.
Web Ecology, 3, 33–42.
Swann, H.K. (1913) A dictionary of English and folk-names of British
birds.London: Witherby. 308 pp.
Tschanz, B., Hegglin, D., Gloor, S. & Bontadina, F. (2011) Hunters and
non-hunters: skewed predation rate by domestic cats in a rural
village. European Journal of Wildlife Research, 57, 597–602.
van Heezik, Y., Smyth, A., Adams, A. & Gordon, J. (2010) Do domestic
cats impose an unsustainable harvest on urban bird populations?
Biological Conservation, 143, 121–130.

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Published

2017-06-01

How to Cite

Flux, J. E. (2017). Comparison of predation by two suburban cats in New Zealand. European Journal of Ecology, 3(1), 85–90. https://doi.org/10.1515/eje-2017-0009

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