Towards meaningful monitoring: A case study of a threatened rodent

Hayley M. Geyle, Gurutzeta Guillera-Arroita, Hugh F. Davies, Ronald S.C. Firth, Brett P. Murphy, Dale G. Nimmo, Euan G. Ritchie, John C.Z. Woinarski, Emily Nicholson

    Research output: Contribution to journalArticle

    Abstract

    Detecting trends in species’ distribution and abundance are essential for conserving threatened species, and depend upon effective monitoring programmes. Despite this, monitoring programmes are often designed without explicit consideration of their ability to deliver the information required by managers, such as their power to detect population changes. Here, we demonstrate the use of existing data to support the design of monitoring programmes aimed at detecting declines in species occupancy. We used single-season occupancy models and baseline data to gain information on variables affecting the occupancy and detectability of the threatened brush-tailed rabbit-rat Conilurus penicillatus (Gould 1842) on the Tiwi Islands, Australia. This information was then used to estimate the survey effort required to achieve sufficient power to detect changes in occupancy of different magnitudes. We found that occupancy varied spatially, driven primarily by habitat (canopy height and cover, distance to water) and fire history across the landscape. Detectability varied strongly among seasons, and was three times higher in the late dry season (July–September), compared to the early dry season (April–June). Evaluation of three monitoring scenarios showed that conducting surveys at times when detectability is highest can lead to a substantial improvement in our ability to detect declines, thus reducing the survey effort and costs. Our study highlights the need for careful consideration of survey design related to the ecology of a species, as it can lead to substantial cost savings and improved insight into species population change via monitoring.

    Original languageEnglish
    Pages (from-to)223-236
    Number of pages14
    JournalAustral Ecology
    Volume44
    Issue number2
    Early online date6 Nov 2018
    DOIs
    Publication statusPublished - Apr 2019

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