Modeling of spatial distribution for scorpions of medical importance in the São Paulo State, Brazil

Brites-Neto, José; Duarte, Keila Maria Roncato

doi:10.14202/vetworld.2015.823-830

Cited by 22 publications

(16 citation statements)

References 33 publications

(37 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Although quite important, few investigations have investigated the determining factors for the geographic distributions of those animals, or how our knowledge of their distributions could be used to elaborate strategies for accident mitigation (e.g. Refs [24,40,41]).…”

Section: Discussionmentioning

confidence: 99%

Vulnerable areas to accidents with scorpions in Brazil

Amado

Moura

Riul

et al. 2021

Tropical Med Int Health

View full text Add to dashboard Cite

objective To identify areas that present a higher risk of exposure to accidents with scorpions in Brazil.methods We used techniques of spatial prioritisation to determine the most vulnerable localities to envenomation by four scorpion species. Our prioritisation integrated ecological niche models with health investment, antivenin availability, access to health care facilities and metrics of human impact data.results The ecological niche models indicated that three scorpion species (Tityus bahiensis, Tityus serrulatus, and Tityus stigmurus) are more associated with human population density, while T. obscurus demonstrated a strong association with temperature variations during the year. Spatial prioritisation indicated that the areas with higher risk exposure to accidents with scorpions are in northern and northeastern Brazil. Alternatively, more isolated but densely populated areas in the southeastern and central regions also emerged as a priority.conclusion Mapping areas where humans are more likely to interact with scorpions can assist in the design of efficient public health policies.

show abstract

Section: Discussionmentioning

confidence: 99%

Vulnerable areas to accidents with scorpions in Brazil

Amado

Moura

Riul

et al. 2021

Tropical Med Int Health

View full text Add to dashboard Cite

show abstract

“…Normally, the threshold used to shift a model's form, from continuous probability to binary, is set by the "maximum sensitivity plus specificity" value provided by MaxEnt (Brites-Neto and Duarte, 2015). This particular value for the S. bungeana grassland ecosystem was 0.3.…”

Section: Suitable Categoriesmentioning

confidence: 99%

Assessing the collapse risk of Stipa bungeana grassland in China based on its distribution changes

Qiao

Guo

et al. 2020

J. Arid Land

View full text Add to dashboard Cite

The criteria used by International Union for Conservation of Nature (IUCN) for its Red List of Ecosystems (RLE) are the global standards for ecosystem-level risk assessment, and they have been increasingly used for biodiversity conservation. The changed distribution area of an ecosystem is one of the key criteria in such assessments. The Stipa bungeana grassland is one of the most widely distributed grasslands in the warm-temperate semi-arid regions of China. However, the total distribution area of this grassland was noted to have shrunk and become fragmented because of its conversion to cropland and grazing-induced degradation. Following the IUCN-RLE standards, here we analyzed changes in the geographical distribution of this degraded grassland, to evaluate its degradation and risk of collapse. Past distribution areas were extracted from the Vegetation Map of China (1:1,000,000). Present realizable distribution areas were equated to these past areas minus any habitat area losses. We then predicted the grassland's present and future (under the Representative Concentration Pathway 8.5 scenario) potential distribution areas using maximum entropy algorithm (MaxEnt), based on field survey data and nine environmental layers. Our results showed that the S. bungeana grassland was mainly distributed in the Loess Plateau, Hexi Corridor, and low altitudes of the Qilian Mountains and Longshou Mountain. This ecosystem occurred mainly on loess soils, kastanozems, steppe aeolian soils and sierozems. Thermal and edaphic factors were the most important factors limiting the distribution of S. bungeana grassland across China. Since 56.1% of its past distribution area (4.9×10 4 km 2 ) disappeared in the last 50 a, the present realizable distribution area only amounts to 2.2×10 4 km 2 . But only 15.7% of its present potential distribution area (14.0×10 4 km 2 ) is actually occupied by the S. bungeana grassland. The future potential distribution of S. bungeana grassland was predicted to shift towards northwest, and the total area of this ecosystem will shrink by 12.4% over the next 50 a under the most pessimistic climate change scenario. Accordingly, following the IUCN-RLE criteria, we deemed the S. bungeana grassland ecosystem in China to be endangered (EN). Revegetation projects and the establishment of protected areas are recommended as effective ways to avert this looming crisis. This empirical modeling study provides an example of how IUCN-RLE categories and criteria may be valuably used for ecosystem assessments in China and abroad.

show abstract

“…Tityus bahiensis is a Brazilian scorpion that is responsible for several accidents in the southeast region [16][17][18]. Their specific biological requirements, such as the habitat temperature and humidity variation, and their sexual reproduction restrict them to this geographic region [19]. This adaptation to a food-competitive environment may have resulted in a selective process, ultimately culminating in the specific animal's venom composition and biological development.…”

Section: Introductionmentioning

confidence: 99%

Tb1, a Neurotoxin from Tityus bahiensis Scorpion Venom, Induces Epileptic Seizures by Increasing Glutamate Release

Beraldo-Neto

Freitas

Pimenta

et al. 2020

Toxins

View full text Add to dashboard Cite

Here, we report the neurotoxic effects aroused by the intracerebral injection (in rats) of Tb1, which is a neurotoxin isolated from Tityus bahiensis scorpion venom. Biochemical analyses have demonstrated that this toxin is similar to the gamma toxin from T. serrulatus, which is a β-scorpion toxin that acts on sodium channels, causing the activation process to occur at more hyperpolarized membrane voltages. Male Wistar rats were stereotaxically implanted with intrahippocampal electrodes and cannulas for electroencephalographic recording and the evaluation of amino acid neurotransmitters levels. Treated animals displayed behavioral and electroencephalographic alterations similar to epileptiform activities, such as myoclonus, wet dog shakes, convulsion, strong discharges, neuronal loss, and increased intracerebral levels of glutamate. Scorpion toxins are important pharmacological tools that are widely employed in ion channel dysregulation studies. The current work contributes to the understanding of channelopathies, particularly epilepsy, which may originate, among other events, from dysfunctional sodium channels, which are the main target of the Tb1 toxin.

show abstract

Modeling of spatial distribution for scorpions of medical importance in the São Paulo State, Brazil

Cited by 22 publications

References 33 publications

Vulnerable areas to accidents with scorpions in Brazil

Vulnerable areas to accidents with scorpions in Brazil

Assessing the collapse risk of Stipa bungeana grassland in China based on its distribution changes

Tb1, a Neurotoxin from Tityus bahiensis Scorpion Venom, Induces Epileptic Seizures by Increasing Glutamate Release

Contact Info

Product

Resources

About