Individual identification of northern quolls (Dasyurus hallucatus) using remote cameras

Hohnen, Rosemary; Ashby, Jack; Tuft, Katherine; McGregor, Hugh

doi:10.1071/am12015

Cited by 50 publications

(45 citation statements)

References 13 publications

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“…Hohnen et al 2013). In our case we needed to test camera set-up before we embarked on a more detailed survey of a larger segment of the local population of long-nosed potoroos.…”

Section: Discussionmentioning

confidence: 99%

Horizontal or vertical? Camera trap orientations and recording modes for detecting potoroos, bandicoots and pademelons

Taylor

Goldingay

Lindsay³

2014

Aust. Mammalogy

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Abstract. Camera traps can detect rare and cryptic species, and may enable description of the stability of populations of threatened species. We investigated the relative performance of cameras oriented horizontally or vertically, and recording mode (still and video) to detect the vulnerable long-nosed potoroo (Potorous tridactylus) as a precursor to population monitoring. We established camera traps for periods of 13-21 days across 21 sites in Richmond Range National Park in northeast New South Wales. Each camera trap set consisted of three KeepGuard KG680V cameras directed at a bait container -one horizontal and one vertical camera in still mode and one horizontal camera in video mode. Potoroos and bandicoots (Perameles nasuta and Isoodon macrourus) were detected at 14 sites and pademelons (Thylogale stigmatica and T. thetis) were detected at 19 sites. We used program PRESENCE to compare detection probabilities for each camera category. The detection probability for all three taxa groups was lowest for the vertical still and similar for the horizontal cameras. The detection probability (horizontal still) was highest for the potoroos (0.43) compared with the bandicoots (0.16) and pademelons (0.25). We estimate that the horizontal stills camera could achieve a 95% probability of detection of a potoroo within 6 days compared with 8 days using a vertical stills camera. This suggests that horizontal cameras in still mode have great potential for monitoring the dynamics of this potoroo population.

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“…Hohnen et al 2013). In our case we needed to test camera set-up before we embarked on a more detailed survey of a larger segment of the local population of long-nosed potoroos.…”

Section: Discussionmentioning

confidence: 99%

Horizontal or vertical? Camera trap orientations and recording modes for detecting potoroos, bandicoots and pademelons

Taylor

Goldingay

Lindsay³

2014

Aust. Mammalogy

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“…The overhead orientation greatly reduced the variation in animal posture that has previously inhibited pelage pattern visibility (Hohnen et al 2013). Additionally, the clarity of pelage patterns was increased by the flash type which provides night time images in colour and with greater contrast.…”

Section: Discussionmentioning

confidence: 85%

“…Additionally, the clarity of pelage patterns was increased by the flash type which provides night time images in colour and with greater contrast. Hohnen et al (2013) 'enticed' D. hallucatus to show their backs to the camera trap by smearing bait on a vertical surface. This method often required several consecutive images for effective identification of individuals (Hohnen et al 2013).…”

Section: Discussionmentioning

confidence: 99%

“…Hohnen et al (2013) 'enticed' D. hallucatus to show their backs to the camera trap by smearing bait on a vertical surface. This method often required several consecutive images for effective identification of individuals (Hohnen et al 2013). In this study, the dorsal surface was always visible and only one image per trigger was required.…”

Section: Discussionmentioning

confidence: 99%

“…Camera traps have previously been used to record unique spot patterns of D. hallucatus and thus allow individual identification; this method could potentially be used in capture-recapture studies to improve estimates of abundance (Hohnen et al 2013). Hohnen et al (2013) used horizontal orientation of their camera traps to collect images of D.…”

Section: The Northern Hopping-mouse (Notomys Aquilo) Is a Cryptic Sementioning

confidence: 99%

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Ecology and conservation of the northern hopping-mouse and sympatric vertebrates of Groote Eylandt

Diete¹

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Effective monitoring is a critical component of wildlife management. The conservation of the enigmatic northern hopping-mouse (Notomys aquilo) has been impeded by poor understanding of the species' ecology; an issue compounded by the lack of appropriate survey methods. Within a genus of largely arid-dwelling rodents, N. aquilo is the only extant species in Australia's northern, monsoonal tropics where it is likely restricted to Groote Eylandt and a small area on the adjacent mainland. Surveys for N. aquilo have traditionally involved recording the location and abundance of indirect signs, as the species is trap-shy towards box-style traps, such as Elliott traps. One of the most important signs is the 'spoil heap' left by the construction of hopping-mouse burrows. Recent surveys for N. aquilo have relied almost entirely upon the identification of spoil heaps; however, the effectiveness of these methods has been questioned. This study aimed to fill key gaps in this knowledge by: (1) evaluating the effectiveness of spoil heap surveys for determining the presence and abundance of N. aquilo; (2) developing more-reliable survey methods for N. aquilo and sympatric vertebrates; and (3) describing the general ecology of N. aquilo with views to its conservation on Groote Eylandt.A novel use of video camera traps allowed the recording of burrow construction by N. aquilo. This confirmed that conspicuous spoil heaps are associated with N. aquilo burrows and these remain visible many months after construction is complete. However, further monitoring confirmed that the sympatric delicate mouse (Pseudomys delicatulus) constructs similar burrows to N. aquilo on Groote Eylandt and spoil heaps made by the two species cannot reliably be differentiated in field surveys. These results emphasised the pressing need for unambiguous survey methods for N. aquilo and suggested that the abundance of the species has potentially been overestimated in the past.Camera trapping and pitfall trapping were identified as possible alternative methods for monitoring N. aquilo. An experiment was conducted to determine if the rate of detection of N. aquilo and other mammals could be increased by the use of a particular bait at camera trap stations. Detection rates for N. aquilo were low and no significant effect of bait type was found for this species. However, sesame oil resulted in the equal highest number of N. aquilo detections, had better longevity, and attracted fewer non-target bandicoots than other baits trialled and, therefore, may be the most useful bait for standardised camera trapping surveys targeting N. aquilo. Trapping with three different sized pitfall traps was conducted in two different habitats over two years. The results from this study demonstrate that general fauna surveys may benefit from the use of a deep, wide pitfall trap that is effective in capturing herpetofauna as well as rare mammals such as N. aquilo. ivThe general ecology of N. aquilo was described using pitfall trapping and radio-tracking. It was found that N. a...

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Detecting and protecting the threatened Kangaroo Island dunnart (Sminthopsis fuliginosusaitkeni)

Hohnen

Murphy

Gates³

et al. 2019

Conservation Science and Practice

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Reliable and cost-effective monitoring methods are a critical component of conservation management practices that work to prevent the extinction of threatened species. We evaluated the best means of monitoring the threatened Kangaroo Island dunnart (Sminthopsis fuliginosus aitkeni, hereafter KI dunnart). Variation in detection probability and cost was examined between four trapping methods. We then compared the occupancy of the KI dunnart in a 2017-2018 survey to a survey from 1999 to 2001. Across the 2017-2018 survey, the KI dunnart was detected at only five sites and was detected most frequently using camera traps on drift fence lines. The taxon was estimated to occupy 27% (95% confidence interval: 7-65%) of sites in the eucalypt woodlands of western KI. Of the methods that have successfully detected KI dunnarts, cameras on fence lines were the most cost-effective. Power analysis suggests that future monitoring surveys in spring and autumn must survey at least 55 sites to be capable of detecting a 60% decline in the KI dunnart population, and 26 sites to detect an 80% decline. Ongoing intensive monitoring is required to assess the population trajectory of the taxon and support its persistence on the island in the long term. K E Y W O R D S

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Individual identification of northern quolls (Dasyurus hallucatus) using remote cameras

Cited by 50 publications

References 13 publications

Horizontal or vertical? Camera trap orientations and recording modes for detecting potoroos, bandicoots and pademelons

Horizontal or vertical? Camera trap orientations and recording modes for detecting potoroos, bandicoots and pademelons

Ecology and conservation of the northern hopping-mouse and sympatric vertebrates of Groote Eylandt

Detecting and protecting the threatened Kangaroo Island dunnart (Sminthopsis fuliginosusaitkeni)

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