Reproductive and feeding biology of the common lancehead Bothrops atrox (Serpentes, Viperidae) from central and southwestern Brazilian Amazonia

Bisneto, Pedro Ferreira; Kaefer, Ígor Luís

doi:10.1590/1809-4392201802371

Cited by 13 publications

(10 citation statements)

References 28 publications

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“…We found that, depending on the city, an increase of 1 g/kg in humidity could lead to a mean increase in the risk of snakebite cases by 24%. The relationship between humidity and the increased risk of snakebites is owing to the fact that in humid seasons, the species that snakes feed on (such as anurans, lizards, and small mammals) are more active; further, their young are born at this time 26,27,28 . At the same time, Bothrops are also more active, and their pups are born 29,30,31,32,33,34,35 .…”

Section: Discussionmentioning

confidence: 99%

Increase in the risk of snakebites incidence due to changes in humidity levels: A time series study in four municipalities of the state of Rondônia

Ferreira

Reis

Boeno

et al. 2020

Rev. Soc. Bras. Med. Trop.

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Introduction: Snakebites represent a serious global public health problem, especially in tropical countries. In Brazil, the incidence of snakebites ranges from 19 to 22 thousand cases per 100000 persons annually. The state of Rondônia, in particular, has had an increasing incidence of snakebites. Methods: A retrospective cross-sectional study on snakebites was conducted from January 2007 to December 2018. Brazil's Information System for Notifiable Diseases was queried for all snakebites reported in Porto Velho, Ariquemes, Cacoal, and Vilhena. Data on land surface temperatures during the day and night, precipitation, and humidity were obtained using the Google Earth Engine. A Bayesian time series model was constructed to describe the pattern of snakebites and their relationship with climate data. Results: In total, 6326 snakebites were reported in Rondônia. Accidents were commonly caused by Bothrops sp. (n=2171, 81.80%). Snakebites most frequently occurred in rural areas (n=2271, 85.5%). Men, with a median age of 34 years (n=2101, 79.1%), were the most frequent bitten. Moderate clinical manifestation was the most common outcome of an accident (n=1101, 41.50%). There were clear seasonal patterns with respect to rainfall, humidity, and temperature. Rainfall and land surface temperature during the day or night did not increase the risk of snakebites in any city; however, changes in humidity increased the risk of snakebites in all cities. Conclusion: This study identified the population exposed to snakes and the influence of anthropic and climatic factors on the incidence of snakebites. According to climate data, changes in humidity increased the risk of snakebites.

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Section: Discussionmentioning

confidence: 99%

Increase in the risk of snakebites incidence due to changes in humidity levels: A time series study in four municipalities of the state of Rondônia

Ferreira

Reis

Boeno

et al. 2020

Rev. Soc. Bras. Med. Trop.

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“…As for the studies that have been carried out in the Adolpho Ducke Forest Reserve (Fraga et al 2013a), the most abundant snake species registered in FeX-UFAM was the Amazonian lancehead (Bothrops atrox) also known as fer-de-lance or jararaca. The species is a generalist in terms of diet and habitat and this may be one of the factors responsible for its high abundance (Martins et al 2002, Bisneto andKaefer 2019), as well as for its high rate of snakebites involving humans in the biome (Alcântara et al 2018). ecological studies at the meso and macroscale have indicated that this species is strongly associated with riparian environments (Turci et al 2009, Fraga et al 2013a, Alcântara et al 2018 and most of the records of the species in the present study were made in this type of environment.…”

Section: Discussionmentioning

confidence: 99%

Composition and ecology of a snake assemblage in an upland forest from Central Amazonia

Masseli

Bruce

Santos

et al. 2019

An. Acad. Bras. Ciênc.

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Most species of Amazonian snakes have wide geographic distributions. However, local environmental factors influence the formation of assemblages in different localities. In this study, we investigated the composition of the assemblage and the effect of environmental variables on the distribution of the species inhabiting an upland forest in the experimental Farm area of the Federal University of Amazonas in Manaus, Brazil. Data collection was carried out in 24 standardized plots. each plot was sampled four times between July 2015 and April 2017 by active search method. We recorded 83 individuals from 29 species belonging to six families. The richness in the study area corresponded to 78% of the snake species and 100% of the families previously recorded for Manaus. As observed in other localities, the most abundant species was the Amazonian lancehead (Bothrops atrox). Multiple linear regression models did not detect any effect of environmental variables on species richness and abundance of individuals. However, quadratic polynomial regression models revealed that intermediate canopy opening percentages positively influence the richness and abundance of snakes. It is possible that the result is related to a tradeoff between the thermoregulation behavior of these animals and to their susceptibility to predation.

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“…Males are smaller than females and are more prone to higher mortality, considering the active foraging lifestyle of the species. In fact, B. atrox exhibits a dynamic use of its habitat, being known as one of the most active hunters of the Bothrops genus [9,11,12]. B. atrox venom causes mainly local damage, such as edema, hemorrhage and necrosis, apart from systemic effects, including blood coagulation disorders [13,14].…”

Section: Introductionmentioning

confidence: 99%

Venom complexity of Bothrops atrox (common lancehead) siblings

Hatakeyama

Tasima

Bravo-Tobar

et al. 2020

J. Venom. Anim. Toxins incl. Trop. Dis

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Background: Variability in snake venoms is a well-studied phenomenon. However, sex-based variation of Bothrops atrox snake venom using siblings is poorly investigated. Bothrops atrox is responsible for the majority of snakebite accidents in the Brazilian Amazon region. Differences in the venom composition of Bothrops genus have been linked to several factors such as ontogeny, geographical distribution, prey preferences and sex. Thus, in the current study, venom samples of Bothrops atrox male and female siblings were analyzed in order to compare their biochemical and biological characteristics. Methods: Venoms were collected from five females and four males born from a snake captured from the wild in São Bento (Maranhão, Brazil), and kept in the Laboratory of Herpetology of Butantan Intitute. The venoms were analyzed individually and as a pool of each gender. The assays consisted in protein quantification, 1-DE, mass spectrometry, proteolytic, phospholipase A 2 , L-amino acid oxidase activities, minimum coagulant dose upon plasma, minimum hemorrhagic dose and lethal dose 50%. Results: Electrophoretic profiles of male's and female's venom pools were quite similar, with minor sex-based variation. Male venom showed higher LAAO, PLA 2 and hemorrhagic activities, while female venom showed higher coagulant activity. On the other hand, the proteolytic activities did not show statistical differences between pools, although some individual variations were observed. Meanwhile, proteomic profile revealed 112 different protein compounds; of which 105 were common proteins of female's and male's venom pools and seven were unique to females. Despite individual variations, lethality of both pools showed similar values. Conclusion: Although differences between female and male venoms were observed, our results show that individual variations are significant even between siblings, highlighting that biological activities of venoms and its composition are influenced by other factors beyond gender.

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Reproductive and feeding biology of the common lancehead Bothrops atrox (Serpentes, Viperidae) from central and southwestern Brazilian Amazonia

Cited by 13 publications

References 28 publications

Increase in the risk of snakebites incidence due to changes in humidity levels: A time series study in four municipalities of the state of Rondônia

Increase in the risk of snakebites incidence due to changes in humidity levels: A time series study in four municipalities of the state of Rondônia

Composition and ecology of a snake assemblage in an upland forest from Central Amazonia

Venom complexity of Bothrops atrox (common lancehead) siblings

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