Shedding light on predator detections: evaluating the impact of camera-trap flash type for feral cat monitoring through in-field observations

Alexandra J. Paton; Jessie C. Buettel; Barry W. Brook

doi:10.1071/ZO24005

RESEARCH ARTICLE (Open Access)

Previous Contents Vol 72(4)

Shedding light on predator detections: evaluating the impact of camera-trap flash type for feral cat monitoring through in-field observations

Alexandra J. Paton

^A ^* , Jessie C. Buettel

^A ^B and Barry W. Brook

^A ^B

+ Author Affiliations

- Author Affiliations

^A School of Natural Sciences, University of Tasmania, Private Bag 55, Sandy Bay, Tas 7001, Australia. Email: Jessie.Buettel@utas.edu.au, Barry.Brook@utas.edu.au

^B ARC Centre of Excellence for Australian Biodiversity and Heritage (CABAH), University of Tasmania, Hobart, Tas, Australia.

^* Correspondence to: Alexandra.Paton@utas.edu.au

Handling Editor: Laura Wilson

Australian Journal of Zoology 72, ZO24005 https://doi.org/10.1071/ZO24005

Submitted: 6 February 2024 Accepted: 27 August 2024 Published: 13 September 2024

© 2024 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)

Abstract

White flash camera-traps are avoided in predator monitoring as they are assumed to lower redetection, despite infrared cameras producing lower-quality night images thus limiting the scope for individual identification and, consequently, the accuracy of density estimates. We sought to determine whether flash type impacts the behaviour of cats (Felis catus). We identified different behavioural responses exhibited by photographed cats, and quantitatively assessed relative activity, redetection rates, and the activity of specific individuals using 11,389 images of feral cats from 62 white flash and 62 infrared camera-traps across Tasmania. We found no difference in the relative activity of cats between flash types (odds ratio of 0.90, [null expectation = 1], CI = 0.55, 1.47), and there was no evidence of a reduction in redetection rate of feral cats following initial detection (odds ratio = 0.83, CI = 0.47, 1.46). The activity of individuals was similar between white flash (average = 0.026, CI = 0.021, 0.032), and infrared cameras (average = 0.028, CI = 0.022, 0.035). White flash cameras appear suitable for monitoring feral cats without resulting in a negative bias, highlighting the need for researchers to critically examine assumptions regarding best methodology.

Keywords: activity, avoidance, detection, feline, invasive species, methodology, monitor, trail camera.

References

Ballard G, Meek PD, Doak S, Fleming PJ, Sparkes J (2014) Camera traps, sand plots and known events: what do camera traps miss. In ‘Camera trapping: wildlife management and research’. (Ed. PD Meek, PJS Fleming) 189–202. (CSIRO Publishing: Melbourne, Victoria, Australia)

Bates D (2016) lme4: linear mixed-effects models using Eigen and S4. R Package Version 1. p. 1.

Bengsen A, Butler J, Masters P (2011) Estimating and indexing feral cat population abundances using camera traps. Wildlife Research 38(8), 732-739.
| Crossref | Google Scholar |

Burns PA, Parrott ML, Rowe KC, Phillips BL (2018) Identification of threatened rodent species using infrared and white-flash camera traps. Australian Mammalogy 40(2), 188-197.
| Crossref | Google Scholar |

Canty A, Ripley B (2017) boot: Bootstrap R (S-Plus) functions. R Package Version 1. pp. 3–20.

Cove MV, Jackson VL (2011) Differences in detection probability between camera trap types for surveying bobcats in a fragmented suburban landscape. Wild Felid Monitor 4(2), 24.
| Google Scholar |

Cunningham CX, Johnson CN, Jones ME (2020) A native apex predator limits an invasive mesopredator and protects native prey: Tasmanian devils protecting bandicoots from cats. Ecology Letters 23(4), 711-721.
| Crossref | Google Scholar | PubMed |

Doherty TS, Dickman CR, Johnson CN, Legge SM, Ritchie EG, Woinarski JCZ (2017) Impacts and management of feral cats Felis catus in Australia. Mammal Review 47(2), 83-97.
| Crossref | Google Scholar |

Efford MG, Hunter CM (2018) Spatial capture–mark–resight estimation of animal population density. Biometrics 74(2), 411-420.
| Crossref | Google Scholar | PubMed |

Fielding MW, Cunningham CX, Buettel JC, Stojanovic D, Jones ME, Brook BW (2021) Dominant carnivore loss benefits native avian and invasive mammalian scavengers. Proceedings of the Royal Society B 289(1985), 20220521.
| Google Scholar |

Glen AS, Cockburn S, Nichols M, Ekanayake J, Warburton B (2013) Optimising camera traps for monitoring small mammals. PLoS ONE 8(6), e67940.
| Crossref | Google Scholar | PubMed |

Henrich M, Niederlechner S, Kröschel M, Thoma S, Dormann CF, Hartig F, Heurich M (2020) The influence of camera trap flash type on the behavioural reactions and trapping rates of red deer and roe deer. Remote Sensing in Ecology and Conservation 6(3), 399-410.
| Crossref | Google Scholar |

Herrera DJ, Moore SM, Herrmann V, McShea WJ, Cove MV (2021) A shot in the dark: white and infrared LED flash camera traps yield similar detection probabilities for common urban mammal species. Hystrix 32(1), 72-75.
| Crossref | Google Scholar |

Hoffmann BD, Broadhurst LM (2016) The economic cost of managing invasive species in Australia. NeoBiota 31, 1-18.
| Crossref | Google Scholar |

Kays R, Arbogast BS, Baker-Whatton M, Beirne C, Boone HM, Bowler M, Burneo SF, Cove MV, Ding P, Espinosa S, et al. (2020) An empirical evaluation of camera trap study design: how many, how long and when? Methods in Ecology and Evolution 11, 700-713.
| Crossref | Google Scholar |

Ladd R, Meek P, Leung LK-P (2023) The influence of camera-trap flash type on the behavioural response, detection rate and individual recognition of Eld’s deer. Wildlife Research 50, 475-483.
| Crossref | Google Scholar |

Legge S, Murphy BP, McGregor H, Woinarski JCZ, Augusteyn J, Ballard G, Baseler M, Buckmaster T, Dickman CR, Doherty T, et al. (2017) Enumerating a continental-scale threat: how many feral cats are in Australia? Biological Conservation 206, 293-303.
| Crossref | Google Scholar |

Meek PD, Ballard G, Claridge A, Kays R, Moseby K, O’brien T, O’connell A, Sanderson J, Swann DE, Tobler M, Townsend S (2014a) Recommended guiding principles for reporting on camera trapping research. Biodiversity and Conservation 23(9), 2321-2343.
| Crossref | Google Scholar |

Meek PD, Ballard G-A, Fleming PJS, Schaefer M, Williams W, Falzon G (2014b) Camera traps can be heard and seen by animals. PLoS ONE 9(10),.
| Crossref | Google Scholar |

Meek P, Ballard G, Fleming P, Falzon G (2016) Are we getting the full picture? Animal responses to camera traps and implications for predator studies. Ecology and Evolution 6(10), 3216-3225.
| Crossref | Google Scholar | PubMed |

Nelson J, Scroggie M (2009) Remote cameras as a mammal survey tool: survey design and practical considerations. Arthur Rylah institute for environmental research unpublished report(2009/36).

Nottingham CM, Buckley HL, Case BS, Glen AS, Stanley MC (2022) Factors affecting home range size of feral cats: a meta-analysis. New Zealand Journal of Ecology 46(2), 3476.
| Crossref | Google Scholar |

O’Brien TG (2011) Abundance, density and relative abundance: a conceptual framework. In ‘Camera traps in animal ecology’. (Eds AF O’Connell, JD Nichols, KU Karanth) pp. 71–96. (Springer)

O’Connell AF, Nichols JD, Karanth KU (2011) ‘Camera traps in animal ecology: methods and analyses.’ (Springer)

R Development Core Team (2010) ‘R: A language and environment for statistical computing.’ (R Foundation for Statistical Computing: Vienna, Austria) Available at https://www.r-project.org/

Rees MW, Pascoe JH, Wintle BA, Le Pla M, Birnbaum EK, Hradsky BA (2019) Unexpectedly high densities of feral cats in a rugged temperate forest. Biological Conservation 239, 108287.
| Crossref | Google Scholar |

Sparkes J, Fleming PJS, McSorley A, Mitchell B (2021) How many feral cats can be individually identified from camera trap images? Population monitoring, ecological utility and camera trap settings. Ecological Management & Restoration 22(3), 246-255.
| Crossref | Google Scholar |

Stokeld D, Frank ASK, Hill B, Choy JL, Mahney T, Stevens A, Young S, Rangers D, Rangers W, Gillespie GR (2016) Multiple cameras required to reliably detect feral cats in northern Australian tropical savanna: an evaluation of sampling design when using camera traps. Wildlife Research 42(8), 642-649.
| Crossref | Google Scholar |

Taggart PL, Peacock DE, Fancourt BA (2020) Camera trap flash-type does not influence the behaviour of feral cats (Felis catus). Australian Mammalogy 42(2), 220-222.
| Crossref | Google Scholar |

Wegge P, Pokheral CP, Jnawali SR (2004) Effects of trapping effort and trap shyness on estimates of tiger abundance from camera trap studies. Animal Conservation 7, 251-256.
| Crossref | Google Scholar |

Wysong ML, Iacona GD, Valentine LE, Morris K, Ritchie EG (2020) On the right track: placement of camera traps on roads improves detection of predators and shows non-target impacts of feral cat baiting. Wildlife Research 47, 557-569.
| Crossref | Google Scholar |

Yates LA, Aandahl Z, Richards SA, Brook BW (2023) Cross validation for model selection: a review with examples from ecology. Ecological Monographs 93(1), e1557.
| Crossref | Google Scholar |