Use of camera-traps in natural trails and shelters for the mammalian survey in the Atlantic Forest

Melo, Geruza Leal; Sponchiado, Jonas; Cáceres, Nilton C.

doi:10.1590/s0073-47212012000100012

Cited by 16 publications

(21 citation statements)

References 14 publications

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“…However, this result could also be due to sampling problems. The use of camera-traps outside the trails and in other habitats (in the canopy, closer to water courses, for example), and night transects in future studies are necessary to clarify this (Harmsen et al 2010, Melo et al 2012. The observed richness (22 species) represented 70.8% of the estimated one (31.1 species).…”

Section: Discussionmentioning

confidence: 95%

Medium and large-sized mammals of the Reserva Ecológica de Guapiaçú, Cachoeiras de Macacu, RJ

2014

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Medium and large-sized terrestrial mammals develop important functions in ecosystems maintenance. However, this group is the most vulnerable to local extinctions, through habitat loss or hunting. This study inventoried the community of medium and large mammals in the Reserva Ecológica de Guapiaçú (REGUA), Cachoeiras de Macacu, RJ, providing data on species composition, richness and abundance. Species were registered through the use of camera traps, sign survey and visual encounters on pre-existing trails and roads. The study was conducted from January to October 2012, with each month considered as a sample unit. An effort of 1568 cameras-day and 120 km traveled, resulted on 302 records of 22 species of medium and large-sized mammals, belonging to eight orders. This value corresponds to more than three-quarters of the richness described from this group in the Atlantic Forest of Rio de Janeiro state. Five species are under some level of regional, national or global threat. Three game species, Pecari tajacu, Cuniculus paca and Dasyprocta leporina were abundant in the area. The observed richness was comparable to that found in other studies conducted in rain forests. Thus, for its high number of species, including those under some degree of threat, we conclude that REGUA is an important area to mammal conservation, especially in the Atlantic Forest of Rio de Janeiro state.

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Section: Discussionmentioning

confidence: 95%

Medium and large-sized mammals of the Reserva Ecológica de Guapiaçú, Cachoeiras de Macacu, RJ

2014

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“…Usually, the period needed to efficiently survey an area for species inventory studies is inversely proportional to the number of camera traps used (Rovero et al, 2013). Moreover, a larger number of camera traps allows modification of their spatial distribution, thereby improving sampling efficiency (Melo et al, 2012;SrbekAraujo & Chiarello, 2013) and allowing lower-density and cryptic species to be recorded (Melo et al, 2012). For example, using different varying camera trap positions (e.g., monitoring both natural and artificial trails and setting cameras at potential animal shelters), can increase sampling efficiency and improve the chances of recording different mammalian species (Melo et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

“…Camera-trapping is highly accurate because species may be clearly identified from photos (SrbekAraujo & Chiarello, 2005), with the enhanced camera technology over the years facilitating vast improvements in accuracy (Sunarto et al, 2013). Moreover, different sampling designs have been developed to enhance the use and accuracy of camera traps in rainforest (e.g., Srbek-Araujo & Chiarello, 2005, 2007, 2013Kelly, 2008;Tobler et al, 2008;Melo et al, 2012). However, camera-trapping is expensive, especially for short-term studies, and implies a high initial cost investment in field material (Silveira et al, 2003;Lyra-Jorge et al, 2008b).…”

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confidence: 99%

Mammal inventories in Seasonal Neotropical Forests: traditional approaches still compensate drawbacks of modern technologies

Carvalho

Rosalino

Adania³

et al. 2016

Iheringia, Sér. Zool.

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ABSTRACT. Variation in body size, behavior, feeding habits and habitat use patterns in medium-and large-sized mammals infl uence the adequacy of sampling methods to register presence and abundance. Moreover, even if methods are similarly adequate, diff erent methodologies result in distinct costeffi ciency relationships (i.e. some may have reduced costs, be less time-consuming and/or require less-skilled technicians). Focusing on three diff erent sampling methods commonly used to monitor medium and large mammals in seasonal tropical forests, we compared the species richness detected by each method and quantifi ed their cost-effi ciencies: (1) camera traps; (2) line transects for direct observations of animals; and (3) line transects seeking tracks/ footprints. We simultaneously monitored medium and large mammals along fi ve trails between July and August 2009 and January and February 2010, in the Serra do Japi Biological Reserve, São Paulo, Brazil. Data from two distinct seasons demonstrated that signifi cantly higher species richness was achieved by using signs of presence and direct observations detected in transects. Camera traps recorded the fewest species, but represented the lowest cost per species. Direct observations and searches for tracks/footprints required a greater number of fi eld technicians (with more skill and experience) to record the focal species and therefore have a higher cost, but allowed twice as many species to be recorded compared to camera traps. The choice of sampling methodology depends on the study objective, mammal species targeted and/or amount of resources available. We advocate use of camera traps for long-term studies and in conjunction with the other two methods to improve identifi cation accuracy, allow individual identifi cation and permit more accurate abundance estimates.KEYWORDS. Camera trap, direct observations, mammals, abundance estimates, animal tracks. RESUMO. Inventário de mamíferos em Floresta Neotropical Sazonal: abordagens tradicionais ainda compensam as desvantagens de tecnologias modernas.A variação no tamanho do corpo, comportamento, hábitos alimentares e padrões de uso de habitat em mamíferos de médio e grande porte infl uenciam a adequação de métodos de amostragem para o registro da presença e abundância. Além disso, mesmo se os métodos são igualmente adequados, diferentes metodologias resultam em distintas relações de custo-efi ciência (ou seja, alguns métodos podem ter custos reduzidos, ser menos demorados e/ou exigir técnicos menos qualifi cados). Concentrando-se em três diferentes métodos comumente usados para monitorar mamíferos de médio e grande porte em fl orestas tropicais sazonais, comparamos a riqueza de espécies detectada por cada método e quantifi camos seu custo-efi ciência: (1) armadilhas fotográfi cas; (2) observações diretas de animais em transectos; e (3) busca por rastros/pegadas em transectos. Nós monitoramos simultaneamente grandes e médios mamíferos ao longo de cinco trilhas entre julho e agosto de 2009 e janeiro e fevereiro de 2010, na ...

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“…Photographs 1) taken on the same date with 30-minute time intervals, and 2) taken at the same hour and date for different individuals of the same species and for different individuals of different species, were considered independent events following Yasuda, (2004), MonroyVilchis et al (2010), Abi-Said & Amr (2012), and Lira- Torres & Briones-Salas (2012). After randomizing the sample 1,000 times, independent events were used to calculate the species accumulation curve following Melo et al (2012). In the curve, the addition of new species was a function of the number of sampling days per active camera between the second semester of 2009 and the first semester of 2011.…”

Section: Methodsmentioning

confidence: 99%

“…Melo et al (2012) concluded that increasing the sampling area and including a greater number of plant covers would attain a better estimate of species diversity. In this study, the SFFOQ area is small compared with those of other studies, especially for the detection of species with wide range and specific habits.…”

Section: Universitas Scientiarum Vol 22 (1): 9-29mentioning

confidence: 99%

Monitoring program for mammals in a protected area of Colombia

et al. 2017

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Between the second semester of 2009 and the first semester of 2011, camera traps were set up in conserved and disturbed habitats in the Otún Quimbaya Flora and Fauna Sanctuary. From a sampling effort of 2,066 camera-days, 673 photographs of 157 independent events were obtained for eight species of wild mammals and a domestic one. Their activity patterns were mainly nocturnal even for those species reported as diurnal. The impact of human interference and exotic species was evident for two species: Tapirus pinchaque and Cerdocyon thous. The former was observed below its altitudinal range with activity patterns mainly crepuscular and nocturnal. The second was observed in the same habitats where domestic dogs were found, with activity patterns mainly crepuscular and nocturnal. These findings suggest that both species have altered their activity patterns. Actions must be focused on decreasing the interaction of these mammals with humans and domestic dogs.

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Use of camera-traps in natural trails and shelters for the mammalian survey in the Atlantic Forest

Cited by 16 publications

References 14 publications

Medium and large-sized mammals of the Reserva Ecológica de Guapiaçú, Cachoeiras de Macacu, RJ

Medium and large-sized mammals of the Reserva Ecológica de Guapiaçú, Cachoeiras de Macacu, RJ

Mammal inventories in Seasonal Neotropical Forests: traditional approaches still compensate drawbacks of modern technologies

Monitoring program for mammals in a protected area of Colombia

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