Camera Trapping of Carnivores: Trap Success Among Camera Types and Across Species, and Habitat Selection by Species, on Salt Pond Mountain, Giles County, Virginia

Kelly, Marcella J.; Holub, Erika L.

doi:10.1656/1092-6194(2008)15[249:ctocts]2.0.co;2

Cited by 193 publications

(160 citation statements)

References 22 publications

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“…Other studies reported that body mass can affect recording by camera traps (Silveira et al, 2003;Kelly and Holub, 2008;Lyra-Jorge et al, 2008;Tobler et al, 2008), but this relationship was not observed in the present study. Results do not take into account that cameras are very sensitive to humidity, so their efficiency decreases with time, gradually lowering their capacity to sample especially small species (Cutler and Swann, 1999;Srbek-Araújo and Chiarello, 2007).…”

Section: Discussioncontrasting

confidence: 90%

Comparison of two mammalian surveys made with camera traps in southeastern Brazil, focusing the abundance of wild mammals and domestic dogs

Carvalho

Adania²,

Esbérard

2013

Braz. J. Biol.

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Sampling allows assessing the impact of human activities on mammal communities. It is also possible to assess the accuracy of different sampling methods, especially when the sampling effort is similar. The present study aimed at comparing two mammalian surveys carried out over a three-year interval, in terms of sampling effort, capture success, abundance of domestic dogs, impact of human activities, and relative biomass using camera traps, in the Serra do Japi Biological Reserve and surroundings, located in Jundiaí, state of São Paulo, southeastern Brazil. The total richness recorded was 13 species, one domestic and 12 wild mammals. Sampling effort in both surveys was similar, but capture success and number of captures differed. The abundance of wild mammals and dogs did also differ between surveys. There was a highly significant correlation between abundance of wild mammals and capture effort for the survey performed in 2006/2007, but not for the survey performed in 2009/2010. The difference between samples may be related to human disturbance, since the number of domestic mammals photographed was higher in the second survey, three years after the first survey. Despite being a reserve, the area is still under pressure from urbanization, biological invasion, environmental degradation, and hunting, which may reduce the abundance of wild mammals.Keywords: survey, diversity, domestic animals, methods, nature reserves.Comparação entre duas amostragens de mamíferos feitas com armadilhas fotográficas no sudeste do Brasil, com foco na abundância de mamíferos silvestres e cães domésticos Resumo Uma das formas de avaliar o impacto das atividades humanas nas comunidades de mamíferos e ter maior conhecimento e acurácia sobre o método utilizado é realizar amostragens, proporcionando a comparação do método, principalmente quando o esforço amostral é semelhante. O presente estudo visou a comparar dois levantamentos de mamíferos realizados na mesma área com três anos de intervalo, quanto aos seguintes aspectos: esforço amostral, sucesso de captura, abundância de cães domésticos, presença de atividades humanas e biomassa relativa das espécies. A riqueza total obtida nos dois períodos de amostragem foi de 13 espécies, sendo 12 espécies selvagens e uma de animal doméstico. O esforço de amostragem para as duas pesquisas foi semelhante, porém o sucesso de captura foi diferente, quando comparados entre si. A abundância de mamíferos selvagens e cães também mostrou diferenças entre os dois períodos. A correlação entre a abundância de mamíferos selvagens e o esforço de captura provou ser altamente significativa para a amostragem realizada em 2006/2007, mas não foi significativa para a realizada em 2009/2010. A diferença entre as amostras pode estar ligada à perturbação humana nesse ambiente, já que o número de animais domésticos fotografados foi maior após três anos de amostragem. Apesar de ser uma área de conservação, também está sujeita a pressões, como especulação imobiliária, invasões, destruição e caça, o que pode estar dim...

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Section: Discussioncontrasting

confidence: 90%

Comparison of two mammalian surveys made with camera traps in southeastern Brazil, focusing the abundance of wild mammals and domestic dogs

Carvalho

Adania²,

Esbérard

2013

Braz. J. Biol.

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“…Bandicoots were detected too infrequently to compare. Differences between studies may also be due to differences in the performance of different camera brands (Swann et al 2004;Kelly and Holub 2008). We recorded false triggers in a mean of 21-35% of activation events compared with 73-85% by Smith and Coulson (2012).…”

Section: Discussionmentioning

confidence: 94%

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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“…We are aware that variations in the efficiency and capability to record species among different brands or models of camera traps can influence the results (Srbek-Araujo & Chiarello 2007), particularly when film and digital cameras are compared (Kelly & Holub 2008). Because of that influence, it might be difficult to distinguish whether the variation in the number of records in a given survey is due to differences in trapping success among species or among the cameras (Kelly & Holub 2008). Fortunately, only film cameras were used in our study, and the differences between the equipment are relevant only to year 1, when Cam Trakker cameras were used, but not the other years (including the 30-day experiment), when only Tigrinus cameras were used.…”

Section: Assumptionsmentioning

confidence: 99%

Influence of camera-trap sampling design on mammal species capture rates and community structures in southeastern Brazil

Srbek‐Araujo

Chiarello

2013

Biota Neotrop.

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The distribution of species and population attributes are critical data for biodiversity conservation. As a tool for obtaining such data, camera traps have become increasingly common throughout the world. However, there are disagreements on how camera-trap records should be used due to imperfect species detectability and limitations regarding the use of capture rates as surrogates for abundance. We evaluated variations in the capture rates and community structures of mammals in camera-trap surveys using four different sampling designs. The camera traps were installed on internal roads (in the first and fourth years of the study), at 100-200 m from roads (internal edges; second year) and at 500 m from the nearest internal road (forest interior; third year). The mammal communities sampled in the internal edges and forest interior were similar to each other but differed significantly from those sampled on the roads. Furthermore, for most species, the number of records and the capture success varied widely among the four sampling designs. A further experiment showed that camera traps placed on the same tree trunk but facing in opposing directions also recorded few species in common. Our results demonstrated that presence or non-detection and capture rates vary among the different sampling designs. These differences resulted mostly from the habitat use and behavioral attributes of species in association with differences in sampling surveys, which resulted in differential detectability. We also recorded variations in the distribution of records per sampling point and at the same spot, evidencing the stochasticity associated with the camera-trap location and orientation. These findings reinforce that for species whose specimens cannot be individually identified, the capture rates should be best used as inputs for presence and detection analyses and for behavior inferences (regarding the preferential use of habitats and activity patterns, for example). Comparisons between capture rates or among relative abundance indices, even for the same species, should be made cautiously.

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Camera Trapping of Carnivores: Trap Success Among Camera Types and Across Species, and Habitat Selection by Species, on Salt Pond Mountain, Giles County, Virginia

Cited by 193 publications

References 22 publications

Comparison of two mammalian surveys made with camera traps in southeastern Brazil, focusing the abundance of wild mammals and domestic dogs

Comparison of two mammalian surveys made with camera traps in southeastern Brazil, focusing the abundance of wild mammals and domestic dogs

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

Influence of camera-trap sampling design on mammal species capture rates and community structures in southeastern Brazil

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