Investigation into survey techniques of large mammals: surveyor competence and camera-trapping vs. transect-sampling

Roberts, Nathan James

doi:10.1093/biohorizons/hzr006

Cited by 49 publications

(40 citation statements)

References 42 publications

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“…in terms of species detectability or number of species detected) for a given level of investment. Previous studies have compared the efficiency and cost-effectiveness of numerous direct and indirect field-survey methods in determining species presence and/or abundance (Gurnell et al 2004a;Gaidet-Drapier et al 2006;Garden et al 2007;Lyra-Jorge et al 2008;Roberts 2011;Tulloch et al 2011;Paull et al 2012). However, invasive-species tracking is a particularly challenging case because of the potentially rapid spread of a species through the landscape.…”

Section: Introductionmentioning

confidence: 99%

Locating species range frontiers: a cost and efficiency comparison of citizen science and hair-tube survey methods for use in tracking an invasive squirrel

et al. 2014

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Context. Improved knowledge of changing species distributions is critically important for conservation managers in the face of increasing species invasions, habitat disturbance and climate change. Efficient monitoring of the location of advancing species invasion frontiers is especially crucial for effective species community and habitat management.Aims. To compare the cost-effectiveness and efficiency of two survey methods, a citizen science survey and a traditional hair-tube survey, in their abilities to locate the current southern invasion frontier of grey squirrels (Sciurus carolinensis) in Ireland.Methods. In the citizen science survey, we collected sighting reports of the grey squirrel and its native congener, the red squirrel (S. vulgaris), from the geographic region of the invasion frontier from untrained members of the public over a 2-year period. Hair-tube surveys were carried out in 14 woodlands (!30 ha) in the same geographic area to test the ability of this indirect field method to identify colonising grey squirrel populations. The costs, efficiency and cost-effectiveness of each method were compared.Key results. The citizen science sighting reports resulted in the clear delineation of the southern frontier of the zone invaded by the grey squirrel. The hair-tube survey ascertained the presence of grey squirrels in 4 of 14 sites, but did not detect this species close to the invasion frontier defined by the citizen science survey. Even though the total cost of the citizen science survey was higher, it was more cost-effective and efficient on a per detection basis for the purposes of detecting the presence of grey and red squirrels.Conclusions. The citizen science survey detected invasive squirrels in sites where the hair-tube survey did not. As such, the citizen science survey provided a more comprehensive snapshot of the location of the grey squirrel invasion frontier more efficiently and cost-effectively than did traditional field techniques.Implications. In the face of increasing ecological and economic costs of biological invasions, we recommend straightforward citizen science surveys, over indirect field surveys, to managers and researchers seeking to efficiently track progressing invasions of readily observable animals cost-effectively.

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Section: Introductionmentioning

confidence: 99%

Locating species range frontiers: a cost and efficiency comparison of citizen science and hair-tube survey methods for use in tracking an invasive squirrel

et al. 2014

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“…Track surveys are widely used because they are relatively easy to implement, are low cost, and do not require the detection of individuals at a specific time of sampling (Wilson & Delahay , Lyra‐Jorge et al . , Roberts ). In addition to the information on diet and habitat specialization, Table summarizes our hypothesized changes in activity and abundances caused by the hurricane, as well as their consequences on track detection.…”

Section: Methodsmentioning

confidence: 99%

“…An alternative in the case of low fauna detectability in tropical regions is the sampling of tracks and signs as a noninvasive method (Carrillo et al 2000, Silveira et al 2003. Track surveys are widely used because they are relatively easy to implement, are low cost, and do not require the detection of individuals at a specific time of sampling (Wilson & Delahay 2001, Lyra-Jorge et al 2008, Roberts 2011). In addition TABLE 1.…”

Section: Methodsmentioning

confidence: 99%

Impact of Hurricane Dean (2007) on Game Species of the Selva Maya, Mexico

2011

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We assessed the effects of a high‐intensity hurricane on the abundance of nine game species in the Yucatan Peninsula, Mexico. We sampled 370 km of linear transects in the 3 yr before the hurricane (i.e., 2003–2005), and 315 km in 3 yr after the hurricane (2008–2010). Relative track abundances of all species declined by two‐thirds of their prehurricane values. Abundances of Central American agouti Dasyprocta punctata, white‐tailed deer Odocoileus virginianus, paca Cuniculus paca, and Great Curassow Crax rubra declined significantly after the hurricane swept the area. Relative track abundances showed a negative, but nonsignificant trend for Ocellated Turkey Meleagris ocellata, white‐nosed coati Nasua narica, brocket deer Mazama sp., and collared peccary Pecari tajacu. Only nine‐banded armadillo Dasypus novemcinctus showed a significant increase in abundance. Strictly frugivore and habitat specialist species were more affected than omnivores and habitat generalist species. These latter characteristics, or their combination, seemed advantageous to withstand the stress of habitat disturbance. The trend of posthurricane recovery was incipient for affected species, and it was significant for five species after the impact. Overall, most frugivores and habitat specialists did not reach their prehurricane relative track abundances, and Great Curassow showed no recovery trend. The future expectation of increased frequency and intensity of hurricanes might have severe effects on such species.

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“…Different habitat types were evaluated and camera traps were put in place to remain for at least 15 days in the areas where the species might possibly be found. In recent years, camera traps have been used in relevant field work with terrestrial mammalian species and they are said to be as effective as other methods (Roberts, 2011). Successful results have been achieved using camera traps to identify habitat preferences of ungulate species (Li et al, 2014).…”

Section: Data Collectionmentioning

confidence: 99%

Karaca (Capreolus capreolus L.)’nın Düzce’de yayılışı ve habitat tercihi

Keten¹

2016

J FAC FOR ISTANBUL U

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Abstract:The roe deer is an important game animal in Turkey. The aim of the current study was to determine the likely distribution area and habitat preferences of roe deer (Capreolus capreolus (L., 1758)) in Duzce Province. The species was observed by wildlife camera traps and direct or indirect observation methods in different habitats in a total of 75 sampling sites during the period between 2013 and 2015. Roe deer avoid human contact. The species are found mostly (79%) in fir and beech forests, preferably those with a closed canopy cover but without dense understory. The numbers of individual of male are higher than the female. They are most often (74%) observed during feeding, with activity peaking at dawn and dusk. The roe deer has a wide distribution range in Turkey and has great potential as a game animal. However, its prevalence is not sufficient in all regions.

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Investigation into survey techniques of large mammals: surveyor competence and camera-trapping vs. transect-sampling

Cited by 49 publications

References 42 publications

Locating species range frontiers: a cost and efficiency comparison of citizen science and hair-tube survey methods for use in tracking an invasive squirrel

Locating species range frontiers: a cost and efficiency comparison of citizen science and hair-tube survey methods for use in tracking an invasive squirrel

Impact of Hurricane Dean (2007) on Game Species of the Selva Maya, Mexico

Karaca (Capreolus capreolus L.)’nın Düzce’de yayılışı ve habitat tercihi

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