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Ecology, management and conservation in natural and modified habitats
RESEARCH ARTICLE

Overcoming the challenges of measuring the abundance of a cryptic macropod: is a qualitative approach good enough?

Karlene Bain A B D , Adrian Wayne C and Roberta Bencini A
+ Author Affiliations
- Author Affiliations

A School of Animal Biology (M092), The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.

B Department of Parks and Wildlife, South Coast Highway, Walpole, WA 6398, Australia.

C Department of Parks and Wildlife, Brain Street, Manjimup, WA 6258, Australia.

D Corresponding author. Email: draconis@wn.com.au

Wildlife Research 41(1) 84-93 https://doi.org/10.1071/WR14065
Submitted: 8 April 2014  Accepted: 22 April 2014   Published: 22 May 2014

Abstract

Context: An understanding of population size and status is necessary for the implementation of appropriate conservation measures to recover threatened taxa. Mark–recapture studies at large spatial scales are impractical and expensive and a rapid survey technique is an attractive option to provide a measure of relative abundance for cryptic species, using indicators of activity.

Aims: The aim of our study was to use conventional methods for population estimation to calibrate a rapid survey technique for the quokka (Setonix brachyurus) in the southern forests of Western Australia, with a view to providing quantitative outcomes from this widely adopted monitoring approach.

Methods: We evaluated the accuracy of relative abundances obtained from the rapid survey technique by comparing them with abundance estimates obtained through established methods for the estimation of populations, including web-based mark–recapture and transect-based counts of activity indicators and sightings.

Key results: The rapid survey technique was effective at determining presence of quokkas but resulted in an over-estimation of population size because of inaccurate assumptions about occupancy and relative abundance of animals. An alternative survey method based on counts of fresh faecal-pellet groups was found to provide a more reliable and practical estimation of population abundance (R2 = 0.97).

Conclusions: Activity indices can be used to quantify population abundance, but only for indicators of activity that can be detected readily and for which freshness of activity can be determined.

Implications: Our findings suggest that a rapid survey based on activity indices can be used to evaluate quantitatively the population size of a species that is rare and potentially mobile at a landscape scale. The attraction of these techniques is that they provide a rapid and inexpensive survey option that is potentially applicable to any cryptic and/or threatened species and is practical for resource-constrained land managers.

Additional keywords: faecal pellets, indirect survey method, population size estimates, quokka, rapid survey, relative abundance, runnels, Setonix brachyurus, sightings, tracks.


References

Akaike, H. (1973). Information theory and an extension of the maximum likelihood principle. In ‘International Symposium on Information Theory’. 2nd edn. (Eds B. N. Petran and F. Csaaki.) pp. 267–281. (Akadeemiai Kiadi: Budapest, Hungary.)

Allen, L., Engeman, R., and Krupa, H. (1996). Evaluation of three relative abundance indices for assessing dingo populations. Wildlife Research 23, 197–206.
Evaluation of three relative abundance indices for assessing dingo populations.Crossref | GoogleScholarGoogle Scholar |

Anderson, D. R. (2001). The need to get the basics right in wildlife field studies. Wildlife Society Bulletin 29, 1294–1297.

Anderson, D. R., Burnham, K. P., White, K. P., and Otis, D. L. (1983). Density estimation of small mammal populations using a trapping web and distance sampling methods. Ecology 64, 674–680.
Density estimation of small mammal populations using a trapping web and distance sampling methods.Crossref | GoogleScholarGoogle Scholar |

Bailey, L. L., Simons, T. R., and Pollock, K. H. (2004). Estimating detection probability parameters for plethodon salamanders using the robust capture–recapture design. The Journal of Wildlife Management 68, 1–13.
Estimating detection probability parameters for plethodon salamanders using the robust capture–recapture design.Crossref | GoogleScholarGoogle Scholar |

Bailey, L. L., Hines, J. E., Nichols, J. D., and MacKenzie, D. I. (2007). Sampling design trade-offs in occupancy studies with imperfect detection: examples and software. Ecological Applications 17, 281–290.
Sampling design trade-offs in occupancy studies with imperfect detection: examples and software.Crossref | GoogleScholarGoogle Scholar | 17479851PubMed |

Bolen, E. G., and Robinson, W. L. (1999). ‘Wildlife Ecology and Management.’ 4th edn. (Prentice Hall: NJ.)

Buckland, S. T., Anderson, D. R., Burnham, K. P., and Laake, J. L. (1993). ‘Distance Sampling: Estimating Abundance of Biological Populations.’ (Chapman and Hall: London.)

Buckland, S. T., Anderson, D. R., Burnham, K. P., Laake, J. L., Borchers, D. L., and Thomas, L. (2001). ‘Introduction to Distance Sampling – Estimating Abundance of Biological Populations.’ (Oxford University Press: Oxford, UK.)

Bureau of Meteorology (2012). ‘Monthly rainfall data for North Walpole, Western Australia 2001–2011.’ Available at http://www.bom.gov.au/climate/data [verified 3 January 2012].

Burnham, K. P., and Anderson, D. R. (1998). ‘Model Selection and Inference: a Practical Information-Theoretic Approach.’ (Springer: New York.)

Burnham, K. P., White, G. C., and Anderson, D. R. (1995). Model selection strategy in the analysis of capture-recapture data. Biometrics 51, 888–898.
Model selection strategy in the analysis of capture-recapture data.Crossref | GoogleScholarGoogle Scholar |

Caro, T. M. (1999). Conservation monitoring: estimating mammal densities in woodland habitats. Animal Conservation 2, 305–315.
Conservation monitoring: estimating mammal densities in woodland habitats.Crossref | GoogleScholarGoogle Scholar |

Caughley, G. (1977). ‘Analysis of Vertebrate Populations.’ (John Wiley and Sons: Brisbane.)

Conroy, M. J. (1996). Designing a study to assess mammalian diversity In ‘Measuring and Monitoring Biological Diversity: Standard Methods for Mammals’. (Eds D. E. Wilson, E. R. Cole, J. D. Nichols, R. Rudran and M. S. Foster.) pp. 177–234. (Smithsonian Institution Press: Washington, DC.)

de Tores, P., Burbidge, A., Morris, K., and Friend, T. (2008). Setonix brachyurus. In ‘IUCN 2013. IUCN Red List of Threatened Species. Version 2013.2’. Available at http://www.iucnredlist.org [verified 8 March 2014].

Defos du Rau, P., Barbraud, C., and Mondain-Monval, J. (2003). Estimating breeding population size of the red-crested pochard (Netta rufina) in the Camargue (southern France), taking into account detection probability implications for conservation. Animal Conservation 6, 379–385.
Estimating breeding population size of the red-crested pochard (Netta rufina) in the Camargue (southern France), taking into account detection probability implications for conservation.Crossref | GoogleScholarGoogle Scholar |

Gardner, S. N., and Mangel, M. (1996). Mark–resight population estimation with imperfect observations. Ecology 77, 880–884.
Mark–resight population estimation with imperfect observations.Crossref | GoogleScholarGoogle Scholar |

Glen, A. S., and Dickman, C. R. (2003). Monitoring bait removal in vertebrate pest control: a comparison using track identification and remote photography. Wildlife Research 30, 29–33.

Hamilton, N., and Rolfe, J. (2011). ‘Assessment of introduced predator presence within the Perup Sanctuary, WA’. (Department of Environment and Conservation: Woodvale, WA.)

Hamm, K. A., Diller, L. V., and Kitchen, D. W. (2002). Comparison of indices to estimate abundance of dusky-footed woodrats. Wildlife Society Bulletin 30, 64–70.

Hayward, M. W., de Tores, P. J., Dillon, M. J., and Fox, B. J. (2003). Local population structure of a naturally occurring metapopulation of the quokka (Setonix brachyurus Macropodidae: Marsupialia). Biological Conservation 110, 343–355.
Local population structure of a naturally occurring metapopulation of the quokka (Setonix brachyurus Macropodidae: Marsupialia).Crossref | GoogleScholarGoogle Scholar |

Hayward, M. W., de Tores, P. J., Augee, M. L., Fox, B. J., and Banks, P. B. (2004). Home range and movements of the quokka Setonix brachyurus (Macropodidae: Marsupialia), and its impact on the viability of the metapopulation on the Australian mainland. Journal of Zoology 263, 219–228.
Home range and movements of the quokka Setonix brachyurus (Macropodidae: Marsupialia), and its impact on the viability of the metapopulation on the Australian mainland.Crossref | GoogleScholarGoogle Scholar |

Hayward, M. W., de Tores, P. J., Dillon, M. J., Fox, B. J., and Banks, P. B. (2005). Using faecal pellet counts along transects to estimate quokka (Setonix brachyurus) population density. Wildlife Research 32, 503–507.
Using faecal pellet counts along transects to estimate quokka (Setonix brachyurus) population density.Crossref | GoogleScholarGoogle Scholar |

Hopkins, H. L., and Kennedy, M. L. (2004). An assessment of indices of relative and absolute abundance for monitoring populations of small mammals. Wildlife Society Bulletin 32, 1289–1296.
An assessment of indices of relative and absolute abundance for monitoring populations of small mammals.Crossref | GoogleScholarGoogle Scholar |

Interim Biogeographical Regionalisation for Australia (IBRA) (2004). ‘IBRA Version 6.1 Sub-regions.’ (Australian Government Department of the Environment and Heritage: Canberra.) Available at http://www.environment.gov.au [verified 8 March 2014].

International Union for the Conservation of Nature (IUCN) (2013). ‘IUCN Red List of Threatened Species. Version 2013.2.’ Available at http://www.iucnredlist.org [verified 8 March 2014].

Johnson, C. N., and Jarman, P. J. (1987). Macropod studies at Wallaby Creek VI. A validation of the use of dung-pellet counts for measuring absolute densities of populations of Macropodids. Australian Wildlife Research 14, 139–145.
Macropod studies at Wallaby Creek VI. A validation of the use of dung-pellet counts for measuring absolute densities of populations of Macropodids.Crossref | GoogleScholarGoogle Scholar |

Karanth, K. U., and Nichols, J. D. (1998). Estimation of tiger densities in India using photographic captures and recaptures. Ecology 79, 2852–2862.
Estimation of tiger densities in India using photographic captures and recaptures.Crossref | GoogleScholarGoogle Scholar |

Kendall, W. L. (1999). Robustness of closed capture–recapture methods to violations of the closure assumption. Ecology 80, 2517–2525.

le Mar, K., Southwell, C., and McArthur, C. (2001). Evaluation of line-transect sampling to estimate nocturnal densities of macropods in open and closed habitats. Wildlife Research 28, 9–16.
Evaluation of line-transect sampling to estimate nocturnal densities of macropods in open and closed habitats.Crossref | GoogleScholarGoogle Scholar |

Lefebvre, L. W., Otis, D. L., and Holler, N. R. (1982). Comparison of open and closed models for cotton rat population estimates. The Journal of Wildlife Management 46, 156–163.
Comparison of open and closed models for cotton rat population estimates.Crossref | GoogleScholarGoogle Scholar |

MacKenzie, D. I., Nichols, J. D., Lachman, G. B., Droege, S., Royle, J. A., and Langtimm, C. A. (2002). Estimating site occupancy rates when detection probabilities are less than one. Ecology 83, 2248–2255.

Mawson, P., and Orell, P. (2001). Sand pads: using tracks to monitor fauna. Wildlife Notes 10, 1–2.

Maxwell, S., Burbidge, A. A., and Morris, K. (1996). ‘The 1996 Action Plan for Australian Marsupials and Monotremes.’ (Wildlife Australia, Canberra.) Available at http://www.environment.gov.au/resource/action-plan-australian-marsupials-and-monotremes [verified 8 March 2014].

McKelvey, K. S., and Pearson, D. E. (2001). Population estimation with sparse data: the role of estimators versus indices revisited. Canadian Journal of Zoology 79, 1754–1765.
Population estimation with sparse data: the role of estimators versus indices revisited.Crossref | GoogleScholarGoogle Scholar |

Montgomery W. I. 1987 The application of capture–mark–recapture methods to the enumeration of small mammal populations. Symposium of the Zoological Society of London 58 25 57

Nichols, J. D., and Pollock, K. H. (1983). Estimation methodology in contemporary small mammal capture–recapture studies. Journal of Mammalogy 64, 253–260.
Estimation methodology in contemporary small mammal capture–recapture studies.Crossref | GoogleScholarGoogle Scholar |

Olson, K. A., Fuller, T. K., Schaller, G. B., Odonkhuu, D., and Murray, M. G. (2005). Estimating the population density of Mongolian gazelles Procapra gutturosa by driving long-distance transects. Oryx 39, 164–169.
Estimating the population density of Mongolian gazelles Procapra gutturosa by driving long-distance transects.Crossref | GoogleScholarGoogle Scholar |

Poole, D. W., Cowan, D. P., and Smith, G. C. (2003). Developing a census method based on sight counts to estimate rabbit (Oryctolagus cuniculus) numbers. Wildlife Research 30, 487–493.
Developing a census method based on sight counts to estimate rabbit (Oryctolagus cuniculus) numbers.Crossref | GoogleScholarGoogle Scholar |

Rowcliffe, J. M., Field, J., Turvey, S. T., and Carbone, C. (2008). Estimating animal density using camera traps without the need for individual recognition. Journal of Applied Ecology 45, 1228–1236.

Short, J., and Turner, B. (1991). Distribution and abundance of spectacled hare-wallabies and euros on Barrow Island, Western Australia. Wildlife Research 18, 421–429.
Distribution and abundance of spectacled hare-wallabies and euros on Barrow Island, Western Australia.Crossref | GoogleScholarGoogle Scholar |

Sinclair, E. A. (1998). Morphological variation among populations of the quokka, Setonix brachyurus (Macropodidae: Marsupialia), in Western Australia. Australian Journal of Zoology 46, 439–449.
Morphological variation among populations of the quokka, Setonix brachyurus (Macropodidae: Marsupialia), in Western Australia.Crossref | GoogleScholarGoogle Scholar |

Slade, N. A., and Blair, S. M. (2000). An empirical test of using counts of individuals captured as indices of population size. Journal of Mammalogy 81, 1035–1045.
An empirical test of using counts of individuals captured as indices of population size.Crossref | GoogleScholarGoogle Scholar |

StataCorp. (2007). Stata statistical software: release 10. StataCorp LP, College Station, TX.

Storr, G. M. (1964). The environment of the quokka (Setonix brachyurus) in the Darling Range, Western Australia. Journal of the Royal Society of Western Australia 47, 1–2.

Thomas, L., Buckland, S. T., Rexstad, E. A., Laake, J. L., Strindberg, S., Hedley, S. L., Bishop, J. R. B., Marques, T. A., and Burnham, K. P. (2010). Distance software: design and analysis of distance sampling surveys for estimation of population size. Journal of Applied Ecology 47, 5–14.
Distance software: design and analysis of distance sampling surveys for estimation of population size.Crossref | GoogleScholarGoogle Scholar | 20383262PubMed |

Triggs, B. E. (1996). ‘Tracks Scats and Other Traces.’ (Oxford University Press: Melbourne.)

Vernes, K. (1999). Pellet counts to estimate density of a rainforest kangaroo. Wildlife Society Bulletin 27, 991–996.

Wayne, A. F., Cowling, A., Ward, C. G., Rooney, J. F., Vellios, C. V., Lindenmayer, D. B., and Donnelly, C. F. (2005). A comparison of survey methods for arboreal possums in jarrah forest, Western Australia. Wildlife Research 32, 701–714.
A comparison of survey methods for arboreal possums in jarrah forest, Western Australia.Crossref | GoogleScholarGoogle Scholar |

White, S. R. (1952). The occurrence of the quokka in the south-west. Western Australian Naturalist 3, 101–103.

White, G. C., and Burnham, K. P. (1999). Program MARK: survival estimation from populations of marked animals. Bird Study 46, S120–S139.
Program MARK: survival estimation from populations of marked animals.Crossref | GoogleScholarGoogle Scholar |