CARVALHO, I.D.; OLIVEIRA, R.; PIRES, A.S. 2014. Medium and large-sized mammals of the Reserva Ecológica de Guapiaçú, Cachoeira de Macacu, RJ. Biota Neotropica 14(3):1-9.
Abstract: 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.
Mostrando postagens com marcador camera trap. Mostrar todas as postagens
Mostrando postagens com marcador camera trap. Mostrar todas as postagens
sábado, 28 de março de 2015
sábado, 18 de outubro de 2014
Camera-trap study of ocelot and other secretive mammals in the northern Pantanal
TROLLE, M.; KÉRY, M. 2005. Camera-trap study of ocelot and other secretive mammals in the northern Pantanal. Mammalia 69:3-4.
Abstract. Reliable information on abundance of the ocelot (Leopardus pardalis) is scarce. We conducted the first camera-trap study in the northern part of the Pantanal wetlands of Brazil, one of the wildlife hotspots of South America. Using capture-recapture analysis, we estimated a density of 0.112 independent individuals per km² (SE 0.069). We list other mammals recorded with camera traps and show that camera-trap placement on roads or on trails has striking effects on camera-trapping rates.
Abstract. Reliable information on abundance of the ocelot (Leopardus pardalis) is scarce. We conducted the first camera-trap study in the northern part of the Pantanal wetlands of Brazil, one of the wildlife hotspots of South America. Using capture-recapture analysis, we estimated a density of 0.112 independent individuals per km² (SE 0.069). We list other mammals recorded with camera traps and show that camera-trap placement on roads or on trails has striking effects on camera-trapping rates.
sábado, 24 de agosto de 2013
Activity patterns of the culpeo fox (Lycalopex culpaeus megellanica) in a non-hunting area of northwestern Patagonia, Argentina
MONTEVERDE, M.J.; PIUDO, L. 2011. Activity patterns of the culpeo fox (Lycalopex culpaeus megellanica) in a non-hunting area of northwestern Patagonia, Argentina. Mammal Study 36:119-125.
Abstract. The culpeo fox is the largest native canid in Patagonia. The majority of past studies on culpeo foxes have focused on trophic ecology, population dynamics, natural history, competitive interactions, management, and habitat use. Little work has been done on determining activity patterns of the fox and thus, conclusions regarding culpeo fox activity patterns have been based on limited data. The objective of our study was to determine culpeo fox activity patterns in a protected area (Lanín National Park, Argentina) using “camera-traps” to test the hypothesis that the culpeo fox is still nocturnal in non-hunting areas. Data were collected from October 2008 through May 2009 at 29 infrared triggered camera stations. We obtained 1,261 culpeo fox photos of which 234 were used for analyses. Diet was studied from 34 culpeo fox scats. Culpeo foxes were most active during nighttime (>70% of the records) confirming the general patterns obtained in other studies. Additionally, examination of culpeo fox scats revealed that they mostly preyed on nocturnal small mammals. The present study offers evidence against the widespread assumption that nocturnal activity of this species is a behavioral response to human harassment, as it was conducted in a protected area where culpeo foxes are not hunted. Instead, their nocturnal behavior may be related to prey activity patterns.
Abstract. The culpeo fox is the largest native canid in Patagonia. The majority of past studies on culpeo foxes have focused on trophic ecology, population dynamics, natural history, competitive interactions, management, and habitat use. Little work has been done on determining activity patterns of the fox and thus, conclusions regarding culpeo fox activity patterns have been based on limited data. The objective of our study was to determine culpeo fox activity patterns in a protected area (Lanín National Park, Argentina) using “camera-traps” to test the hypothesis that the culpeo fox is still nocturnal in non-hunting areas. Data were collected from October 2008 through May 2009 at 29 infrared triggered camera stations. We obtained 1,261 culpeo fox photos of which 234 were used for analyses. Diet was studied from 34 culpeo fox scats. Culpeo foxes were most active during nighttime (>70% of the records) confirming the general patterns obtained in other studies. Additionally, examination of culpeo fox scats revealed that they mostly preyed on nocturnal small mammals. The present study offers evidence against the widespread assumption that nocturnal activity of this species is a behavioral response to human harassment, as it was conducted in a protected area where culpeo foxes are not hunted. Instead, their nocturnal behavior may be related to prey activity patterns.
sábado, 2 de fevereiro de 2013
Composição e abundância relativa dos mamíferos de médio e grande porte no Parque Estadual do Turvo, Rio Grande do Sul, Brasil
KASPER, C.B.; MAZIM, F.D.; SOARES, J.B.G.; OLIVEIRA, T.G.; FABIÁN, M.E. 2007. Composição e abundância relativa dos mamíferos de médio e grande porte no Parque Estadual do Turvo, Rio Grande do Sul, Brasil. Revista Brasileira de Zoologia 24(4):1087-1100.
Abstract. Composition and relative abundance of the medium-large sized mammals of Turvo State Park, Rio Grande do Sul, Brazil. Between January of 2005 and December of 2006, studies on the composition and relative abundance of medium and large sized mammals were carried out in Turvo State Park. Records came from camera-trapping, in addition to visualization and presence and absence data from track surveys along pre determined transects. At total, 29 species of medium-large sized mammals were listed. Of these, Dasyprocta azarae Lichtenstein, 1823 and Sylvilagus brasiliensis (Linnaeus, 1758) were the most frequently found. For carnivores, the majority of records were for Nasua nasua (Linnaeus, 1766) and Leopardus pardalis (Linnaeus, 1758), whereas Leopardus tigrinus (Schreber, 1775), Leopardus wiedii (Schinz, 1782) and Galictis cuja (Molina 1782), had the least. Among the ungulates, only Pecari tajacu (Linnaeus, 1758) showed frequent records, ranking fourth overall. Some species, common to other environments, showed few records at Turvo State Park, such as Dasypus novemcinctus Linnaeus, 1758 and Didelphis albiventris Lund, 1840. Data was suggestive of the probable local extinction of Tayassu pecari (Link, 1795) in the Park. The conservation of the medium and large sized mammals of this conservation area is strongly associated with the conservation of the “Misiones Green Corridor”, which probably represents a source area for many species.
Abstract. Composition and relative abundance of the medium-large sized mammals of Turvo State Park, Rio Grande do Sul, Brazil. Between January of 2005 and December of 2006, studies on the composition and relative abundance of medium and large sized mammals were carried out in Turvo State Park. Records came from camera-trapping, in addition to visualization and presence and absence data from track surveys along pre determined transects. At total, 29 species of medium-large sized mammals were listed. Of these, Dasyprocta azarae Lichtenstein, 1823 and Sylvilagus brasiliensis (Linnaeus, 1758) were the most frequently found. For carnivores, the majority of records were for Nasua nasua (Linnaeus, 1766) and Leopardus pardalis (Linnaeus, 1758), whereas Leopardus tigrinus (Schreber, 1775), Leopardus wiedii (Schinz, 1782) and Galictis cuja (Molina 1782), had the least. Among the ungulates, only Pecari tajacu (Linnaeus, 1758) showed frequent records, ranking fourth overall. Some species, common to other environments, showed few records at Turvo State Park, such as Dasypus novemcinctus Linnaeus, 1758 and Didelphis albiventris Lund, 1840. Data was suggestive of the probable local extinction of Tayassu pecari (Link, 1795) in the Park. The conservation of the medium and large sized mammals of this conservation area is strongly associated with the conservation of the “Misiones Green Corridor”, which probably represents a source area for many species.
sábado, 26 de janeiro de 2013
Estimating puma densities from câmera trapping across three study sites: Bolivia, Argentina, and Belize
KELLY, M.J.; NOSS, A.J.; DI BITETTI, M.S.; MAFEI, L.; ARISPE, R.L.; PAVIOLO, A.; DE ANGELO, C.D.; DI BLANCO, Y.E. 2008. Estimating puma densities from câmera trapping across three study sites: Bolivia, Argentina, and Belize. Journal of Mammalogy 89(2):408-418.
Abstract. Estimates of abundance are extremely valuable for species conservation, yet determining abundance for elusive, wide-ranging, carnivores is difficult. We estimated density of pumas using remote cameras across study sites in Bolivia, Argentina, and Belize. We used obvious and subtle markings to identify individual pumas in photographs and conducted double-blind identifications to examine the degree of agreement among investigators. Average agreement on identification between pairs of investigators was nearly 80.0% and 3-way agreement was 72.9%. Identification of pumas as different individuals was uncommon (7.8% pairwise, 0.69% 3-way disagreement) with the remainder described as unidentifiable. Densities of pumas varied consistently from site to site regardless of investigator. Bolivian pumas moved the shortest distances between camera stations and Argentinean pumas the longest, but distances among cameras and area covered by surveys varied among sites. We applied a correction factor to the Bolivian data to account for the small area surveyed and found that, averaged across investigator, Bolivia had significantly more pumas per 100 km² (mean 6 SD; 6.80 6 1.5) than Belize (3.42 6 1.3) or Argentina (0.67 6 0.2). Numbers of pumas in Argentina match those of low-density North American sites, and those for Belize are consistent with the Pantanal and high-density North American sites. Densities of pumas can be reliably estimated with remote cameras for these sites, and our work presents the 1st density estimates for Central America and for forested environments in South America.
Abstract. Estimates of abundance are extremely valuable for species conservation, yet determining abundance for elusive, wide-ranging, carnivores is difficult. We estimated density of pumas using remote cameras across study sites in Bolivia, Argentina, and Belize. We used obvious and subtle markings to identify individual pumas in photographs and conducted double-blind identifications to examine the degree of agreement among investigators. Average agreement on identification between pairs of investigators was nearly 80.0% and 3-way agreement was 72.9%. Identification of pumas as different individuals was uncommon (7.8% pairwise, 0.69% 3-way disagreement) with the remainder described as unidentifiable. Densities of pumas varied consistently from site to site regardless of investigator. Bolivian pumas moved the shortest distances between camera stations and Argentinean pumas the longest, but distances among cameras and area covered by surveys varied among sites. We applied a correction factor to the Bolivian data to account for the small area surveyed and found that, averaged across investigator, Bolivia had significantly more pumas per 100 km² (mean 6 SD; 6.80 6 1.5) than Belize (3.42 6 1.3) or Argentina (0.67 6 0.2). Numbers of pumas in Argentina match those of low-density North American sites, and those for Belize are consistent with the Pantanal and high-density North American sites. Densities of pumas can be reliably estimated with remote cameras for these sites, and our work presents the 1st density estimates for Central America and for forested environments in South America.
sábado, 28 de abril de 2012
Camera trapping for jaguar (Panthera onca) in the Tuichi Valleys, Bolivia
WALLACE, R.B.; GOMEZ, H.; AYALA, G.; ESPINOZA, F. 2003. Camera trapping for jaguar (Panthera onca) in the Tuichi Valleys, Bolivia. Mastozoología Neotropical 10(1):133-139.
Abstract. Camera trapping techniques, in combination with robust mark-recapture statistics, have been used extensively in Asia to provide tiger population density estimates and relative abundance information. Here we present the results of a first attempt to use these methodologies to determine jaguar abundance. Results suggest a relatively low jaguar population density. Nevertheless, it is hypothesized that previous human disturbance at the site may be responsible for this situation, thereby underlining the need for further studies of this nature.
Abstract. Camera trapping techniques, in combination with robust mark-recapture statistics, have been used extensively in Asia to provide tiger population density estimates and relative abundance information. Here we present the results of a first attempt to use these methodologies to determine jaguar abundance. Results suggest a relatively low jaguar population density. Nevertheless, it is hypothesized that previous human disturbance at the site may be responsible for this situation, thereby underlining the need for further studies of this nature.
quarta-feira, 28 de dezembro de 2011
Fotos: Armadilha Fotográfica
Fotógrafo: Maury S.L. Abreu
Contato: maury.abreu@gmail.com
quarta-feira, 22 de junho de 2011
Fotos: Roedor cricetídeo em armadilha fotográfica
Espécie: roedor cricetídeo não identificado.
Fotógrafo: Maury S.L. Abreu (em armadilha fotográfica).
Contato: maury.abreu@gmail.com.
quarta-feira, 15 de junho de 2011
Fotos: Mazama americana em armadilha fotográfica
Fotógrafo: Maury S.L. Abreu (em armadilha fotográfica).
Contato: maury.abreu@gmail.com.
quarta-feira, 1 de junho de 2011
Fotos: Didelphis albiventris em armadilha fotográfica
Espécie: Didelphis albiventris (gambá-de-orelha-branca).
Fotógrafo: Maury S.L. Abreu (em armadilha fotográfica).
Contato: maury.abreu@gmail.com.
quarta-feira, 11 de maio de 2011
Fotos: Cerdocyon thous em armadilha fotográfica
Espécie: Cerdocyon thous (graxaim-do-mato, cachorro-do-mato, raposinha).
Fotógrafo: Maury S.L. Abreu (em armadilha fotográfica).
Contato: maury.abreu@gmail.com.
sábado, 7 de maio de 2011
Is camera-trapping an efficient method for surveying mammals in Neotropical forests? A case study in south-eastern Brazil
SRBEK-ARAUJO, A.C.; CHIARELLO, A.G. 2005. Is camera-trapping an efficient method for surveying mammals in Neotropical forests? A case study in south-eastern Brazil. Journal of Tropical Ecology 21:121-125.
Por se tratar de uma nota (short communication), este artigo não possui abstract, mas o título e as palavras-chave dizem muito sobre o assunto. Interessante para quem trabalha com armadilhas fotográficas.
Por se tratar de uma nota (short communication), este artigo não possui abstract, mas o título e as palavras-chave dizem muito sobre o assunto. Interessante para quem trabalha com armadilhas fotográficas.
quarta-feira, 27 de abril de 2011
Fotos: Cerdocyon thous em armadilha fotográfica
Espécie: Cerdocyon thous (graxaim-do-mato, cachorro-do-mato, raposinha).
Fotógrafo: Maury S.L. Abreu (com armadilha fotográfica).
Contato: maury.abreu@gmail.com.
quarta-feira, 20 de abril de 2011
Fotos: Nasua nasua, em armadilha fotográfica
Aqui vai a mais uma foto pro blog. Esta foto foi tirada com uma armadilha fotográfica no município de Barracão, Rio Grande do Sul (fronteira com Santa Catarina).
Espécie: Nasua nasua (quati).
Fotógrafo: Maury S. L. Abreu (com armadilha fotográfica).
Contato: maury.abreu@gmail.com.
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