Enhancing strategic deployment of baiting transects for invasive species control – a case study for feral pig baiting in north-eastern Australia
Cameron Wilson
A B * , Matthew Gentle B C and Darren Marshall D
A
B
C
D
Abstract
Baits are used to deliver lethal or other substances in wildlife management programs across the globe. Successful baiting campaigns are contingent upon the availability of baits to target animals. Bait density is often increased in an attempt to improve bait encounter probabilities. However, this comes with a concomitant increase in cost and may result in significant bait wastage if deployed in areas of low target species activity.
The aim of this study was to assess the effectiveness, efficiency and cost of different bait transect methods in intersecting home and core ranges of feral pigs as a case study to determine optimal spacing and placement of baiting transects.
The authors simulated a variety of systematically spaced aerial transects, watercourse-aligned aerial transects and ground transects along property boundaries and farm tracks, and compared them with home and core ranges of feral pigs, at two study sites in Queensland, Australia. Transect effectiveness at intersecting pig ranges was determined through beta-regression and estimated marginal means (emmeans); efficiency was considered as emmeans per unit of transect length.
The study found that systematically spaced aerial transects at 4 km intervals were the most efficient means of intersecting both home and core ranges of feral pigs. Additionally, no alternate transect method, either aerial or ground, provided significantly greater effectiveness at intersecting feral pig home and core ranges at these study sites. Ground transects along farm tracks and property boundaries were also between 113% and 192% more expensive than aerial transects at 4 km spaced intervals for either fixed-wing or rotary aircraft.
Systematically spaced aerial transects at 4 km intervals are among the most effective and are the most efficient means of intersecting feral pig ranges at the study sites examined.
Our methodology offers a blueprint for both vaccination and toxin baiting programs to assess and compare bait transect placements. More specifically for feral pig control, aerial transects with 4 km systematic spacing provide an effective and efficient means for intersecting feral pig ranges. Furthermore, additional data on bait encounter and interaction probabilities are required to determine transect effectiveness at bait uptake by the target species.
Keywords: aerial baiting, bait distribution, encounter rate, feral pig, interaction rate, meat baiting, poison baiting, transect placement, vaccination.
References
Algar D, Angus GJ, Williams MR, Mellican AE (2007) Influence of bait type, weather and prey abundance on bait uptake by feral cats (Felis catus) on Peron Peninsula, Western Australia. Conservation Science Western Australia 6, 109-149.
| Google Scholar |
Allen LR, Fleming PJS, Thompson JA, Strong K (1989) Effect of presentation on the attractiveness and palatability to wild dogs and other wildlife of 2 unpoisoned wild-dog bait types. Wildlife Research 16, 593-598.
| Crossref | Google Scholar |
Australian Pesticides and Veterinary Medicines Authority (2021) Permit to allow minor use of a registered agvet chemical product for the control of feral pigs. Permit Number – PER89572. Available at https://permits.apvma.gov.au/PER89572.PDF
Australian Taxation Office (2023) Expenses for a car you own or lease. Available at https://www.ato.gov.au/individuals/income-deductions-offsets-and-records/deductions-you-can-claim/cars-transport-and-travel/motor-vehicle-and-car-expenses/expenses-for-a-car-you-own-or-lease/#:~:text=Use%20the%20rate%20for%20the,use%2072%20cents%20per%20kilometre [accessed 6 June 2023]
Ballard G, Fleming PJS, Meek PD, Doak S (2020) Aerial baiting and wild dog mortality in south-eastern Australia. Wildlife Research 47, 99-105.
| Crossref | Google Scholar |
Bureau of Meteorology (2022a) Climate classification maps. Available at http://www.bom.gov.au/jsp/ncc/climate_averages/climate-classifications/index.jsp?maptype=kpngrp#maps [accessed 8 April 2022]
Bureau of Meteorology (2022b) Summary statistics Miles Post Office. Available at http://www.bom.gov.au/climate/averages/tables/cw_042023.shtml [accessed 8 April 2022]
Bureau of Meteorology (2022c) Summary statistics Rolleston. Available at http://www.bom.gov.au/climate/averages/tables/cw_035059.shtml [accessed 8 April 2022]
Calenge C (2006) The package “adehabitat” for the R software: a tool for the analysis of space and habitat use by animals. Ecological Modelling 197, 516-519.
| Crossref | Google Scholar |
Caley P (1997) Movements, activity patterns and habitat use of feral pigs (Sus scrofa) in a tropical habitat. Wildlife Research 24, 77-87.
| Crossref | Google Scholar |
Clontz LM, Pepin KM, VerCauteren KC, Beasley JC (2022) Influence of biotic and abiotic factors on home range size and shape of invasive wild pigs (Sus scrofa). Pest Management Science 78, 914-928.
| Crossref | Google Scholar | PubMed |
Cribari-Neto F, Zeileis A (2010) Beta regression in R. Journal of Statistical Software 34, 1-24.
| Crossref | Google Scholar |
Department of Environment and Science (2022) WetlandInfo. Available at https://wetlandinfo.des.qld.gov.au/wetlands/ [accessed 9 June 2021]
Department of Natural Resources Mines and Energy (2013) Stock routes – Queensland. Available at https://qldspatial.information.qld.gov.au/catalogue/custom/detail.page?fid={A97FBCB0-2EA8-4768-9398-D6192879F6FD} [accessed 20 July 2021]
Department of Resources (2021a) Land use mapping – 1999 to Current – Queensland. Available at https://qldspatial.information.qld.gov.au/catalogue/custom/detail.page?fid={273F1E50-DD95-4772-BD6C-5C1963CAA594} [accessed 20 July 2021]
Department of Resources (2021b) Property boundaries Queensland. Available at https://qldspatial.information.qld.gov.au/catalogue/custom/detail.page?fid={3F217A59-1FDB-412A-813D-A1E7843FB618} [accessed 20 July 2021]
Department of Resources (2021c) Baseline roads and tracks – Queensland. Available at https://qldspatial.information.qld.gov.au/catalogue/custom/detail.page?fid={BEF06A7B-0F0B-4DE0-B7A6-D4B4C2651993} [accessed 20 July 2021]
Dexter N (1996) The effect of an intensive shooting exercise from a helicopter on the behaviour of surviving feral pigs. Wildlife Research 23, 435-441.
| Crossref | Google Scholar |
Fair Work Ombudsman (2023) Minimum wages. Available at https://www.fairwork.gov.au/tools-and-resources/fact-sheets/minimum-workplace-entitlements/minimum-wages [accessed 6 June 2022]
Fancourt BA, Augusteyn J, Cremasco P, Nolan B, Richards S, Speed J, Wilson C, Gentle MN (2021) Measuring, evaluating and improving the effectiveness of invasive predator control programs: feral cat baiting as a case study. Journal of Environmental Management 280, 111691.
| Crossref | Google Scholar | PubMed |
Fancourt BA, Harry G, Speed J, Gentle MN (2022) Efficacy and safety of Eradicat® feral cat baits in eastern Australia: population impacts of baiting programmes on feral cats and non-target mammals and birds. Journal of Pest Science 95, 505-522.
| Crossref | Google Scholar |
Gardner CL, Beckmen KB, Pamperin NJ, Del Vecchio P (2013) Experimental treatment of dog lice infestation in interior Alaska wolf packs. The Journal of Wildlife Management 77, 626-632.
| Crossref | Google Scholar |
Henning J, Giorgi E, Soares Magalhães RJ, Tizzani P, Viviani P, Pejovic N, Hrapović M, Potzsch C (2017) Factors influencing the success of aerial rabies vaccination of foxes. Scientific Reports 7, 14376.
| Crossref | Google Scholar | PubMed |
Kelly DJ, Corner LAL, Gormley E, Murphy D, Costello E, Aldwell FE, Marples NM (2011) Evaluation of attractant flavours for use in oral vaccine baits for badgers (Meles meles). European Journal of Wildlife Research 57, 767-774.
| Crossref | Google Scholar |
Kreplins TL, Kennedy MS, Adams PJ, Bateman PW, Dundas SD, Fleming PA (2018) Fate of dried meat baits aimed at wild dog (Canis familiaris) control. Wildlife Research 45, 528-538.
| Crossref | Google Scholar |
Lenth R, Buerkner P, Herve M, Love J, Riebl H, Singmann H (2021) emmeans: estimated marginal means, aka Least-Squares Means. R package version 1.7.0. Available at https://CRAN.R-project.org/package=emmeans
Mitchell J, Dorney W, Mayer R, McIlroy J (2007) Spatial and temporal patterns of feral pig diggings in rainforests of north Queensland. Wildlife Research 34, 597-602.
| Crossref | Google Scholar |
Moennig V (2015) The control of classical swine fever in wild boar. Frontiers in Microbiology 6, 1211.
| Crossref | Google Scholar |
Pebesma E (2018) Simple features for R: standardized support for spatial vector data. The R Journal 10, 439-446.
| Crossref | Google Scholar |
R Core Team (2021) ‘R: a language and environment for statistical computing.’ (R Foundation for Statistical Computing: Vienna, Austria). Available at https://www.R-project.org/
Rosatte RC, Donovan D, Davies JC, Allan M, Bachmann P, Stevenson B, Sobey K, Brown L, Silver A, Bennett K, Buchanan T, Bruce L, Gibson M, Beresford A, Beath A, Fehlner-Gardiner C, Lawson K (2009) Aerial distribution of ONRAB® baits as a tactic to control rabies in raccoons and striped skunks in Ontario, Canada. Journal of Wildlife Diseases 45, 363-374.
| Crossref | Google Scholar | PubMed |
Samaniego-Herrera A, Anderson DP, Parkes JP, Aguirre-Muñoz A (2013) Rapid assessment of rat eradication after aerial baiting. Journal of Applied Ecology 50, 1415-1421.
| Crossref | Google Scholar |
Saunders G, Kay B (1991) Movements of feral pigs (Sus scrofa) at Sunny Corner, New South Wales. Wildlife Research 18, 49-61.
| Crossref | Google Scholar |
Shahwar De, Azeem SA, Kawan A, Mukhtar H, Sajawal A, Noureen S, Khalil S (2024) Significance of additives to enhance the acceptance of poison bait in poultry rodents of Haripur, Khyber Pakhtunkhwa, Pakistan. PLoS ONE 19, e0272397.
| Crossref | Google Scholar | PubMed |
Siers S, Pitt W, Eisemann J, Clark L, Shiels AB, Clark C, Gosnell R, Messaros M (2019) In situ evaluation of an automated aerial bait delivery system for landscape-scale control of invasive brown treesnakes on Guam. USDA National Wildlife Research Center - Staff Publications. Available at https://digitalcommons.unl.edu/icwdm_usdanwrc/2252
Taggart PL, Taylor P, Patel KK, Noble DWA (2023) Baiting in conservation and pest management: a systematic review of its global applications in a changing world. Biological Conservation 284, 110214.
| Crossref | Google Scholar |
Wilson C, Gentle M (2022) Feral pig population control techniques: a review and discussion of efficacy and efficiency for application in Queensland. Department of Agriculture and Fisheries, Brisbane, Qld, Australia. Available at https://www.publications.qld.gov.au/ckan-publications-attachments-prod/resources/65da2abf-25e6-4464-a8ee-748dc579ff2d/feral-pig-control-techniques-a-review-and-discussion-of-efficacy-and-efficiency-for-application-.pdf?ETag=5ce4232aa26ec7bcac68d828f28bc129
Wilson C, Gentle M, Marshall D (2023a) Feral pig (Sus scrofa) activity and landscape feature revisitation across four sites in eastern Australia. Australian Mammalogy 45, 305-316.
| Crossref | Google Scholar |
Wilson C, Gentle M, Marshall D (2023b) Factors influencing the activity ranges of feral pigs (Sus scrofa) across four sites in eastern Australia. Wildlife Research 50, 876-889.
| Crossref | Google Scholar |
