ABSTRACT
South American coralsnakes are characterized by inconspicuous and poorly known species, which are potentially very sensitive to climate change. Here, we assess the impact of future climate change on the distributions of the Micrurus lemniscatus species complex after addressing the Wallacean shortfalls and refining the knowledge about their current geographic distributions. We also evaluate the efficiency of the current reserve network to protect the species in the present and future. We applied ecological niche model tools through a carefully examined set of occurrence records to generate potential present distributions and to project these distributions into future scenarios of climate change. Specific thresholds based on occurrence records along with expert opinions were used to delineate the geographic distribution of each species. A hierarchical ANOVA was applied to evaluate the uncertainties in species distributions across niche modeling methods and climate models and nested into the time factor (present and future). Multiple regression models were used to infer the relative importance of the climatic variables to determine the species' suitability. A gap analysis was performed to address the representativeness of species distributions into protected areas. Predicted geographic distributions were compatible with the known distributions and the expert opinions, except for M. l. carvalhoi. New areas for field research were identified. Variation in precipitation was the most important factor defining the habitat suitability for all species, except for M. diutius. All taxa (except M. l. lemniscatus) will shrink their distributions in the future; less than 50% of the present suitable areas are protected in reserve networks, and less than 40% of these areas will be held in reserves in the future. We found strong evidence that coralsnakes may be highly sensitive to the ongoing changes and must be protected.
Subject(s)
Climate Change , Coral Snakes/physiology , Ecology , Animals , EcosystemABSTRACT
We described a new species of monadal coral snake of the genus Micrurus from the region of Tabatinga and Leticia, along the boundaries of Brazil, Colombia, and Peru. The new species can be distinguished from the other congeners by the combination of the following characters: absence of a pale nuchal collar; black cephalic-cap extending from rostral to firstdorsal scale and enclosing white tipped prefrontal scales; upper half of first to four supralabials and postoculars black; tricolor body coloration, with 27-31 black rings bordered by narrower white rings and 27-31 red rings; tail coloration similar to body, with alternating black rings bordered by irregular narrow white rings, red rings of the same width as the black rings; ventral scales 205-225; subcaudal scales 39-47.
Subject(s)
Animal Distribution , Elapidae/anatomy & histology , Elapidae/classification , Animals , Brazil , Elapidae/physiology , Female , Male , Species SpecificityABSTRACT
The genus Micrurus comprises 123 currently recognized taxa (species and subspecies) that are traditionally arranged in four species groups diagnosable mainly by color pattern characteristics. Here, we describe a new species of triadal coral snake from northeastern Brazil. The new species is distinguished from other sympatric triadal congeners (M. lemniscatus carvalhoi, M. ibiboboca and M. brasiliensis) mainly by the entirely black parietals and by a suite of external characters and hemipenial morphology. The new species appears to be restricted to tropical ombrophilous lowland coastal forests of northeastern Brazil and all recently collected specimens are known to occur in small forest patches surrounded by periurban environment, which calls for an urgent evaluation on its conservation status.
Subject(s)
Elapidae/anatomy & histology , Elapidae/classification , Animals , Brazil , Female , MaleABSTRACT
Two cases of proven coral snake bites were reported in Belém, Pará State, Brazil. The first case was a severe one caused by Micrurus surinamensis. The patient required mechanical ventilation due to acute respiratory failure. The second case showed just mild signs of envenomation caused by Micrurus filiformis. Both patients received specific Micrurus antivenom and were discharged without further complications. Coral snake bites are scarcely reported in the Amazon region and there is a broad spectrum of clinical manifestations, varying from extremely mild to those which may rapidly lead to death if the patient is not treated as soon as possible.
Dois acidentes por coral verdadeira são descritos em Belém, Pará. O primeiro caso foi decorrente de envenenamento por Micrurus surinamensis, no qual a vítima necessitou ventilação mecânica por insuficiência respiratória. O segundo, causado por Micrurus filiformis, apresentou apenas manifestações leves. Ambos os pacientes receberam soro antielapídico específico e evoluíram sem complicações. Acidentes por coral verdadeira na região Amazônica são raramente descritos e podem cursar com um largo espectro de alterações, que variam desde quadros de envenenamento muito leves até manifestações com risco de óbito.
Subject(s)
Adolescent , Animals , Humans , Male , Young Adult , Antivenins/therapeutic use , Elapidae , Elapid Venoms/poisoning , Snake Bites/diagnosis , Snake Bites/therapy , Brazil , Severity of Illness IndexABSTRACT
Two cases of proven coral snake bites were reported in Belém, Pará State, Brazil. The first case was a severe one caused by Micrurus surinamensis. The patient required mechanical ventilation due to acute respiratory failure. The second case showed just mild signs of envenomation caused by Micrurus filiformis. Both patients received specific Micrurus antivenom and were discharged without further complications. Coral snake bites are scarcely reported in the Amazon region and there is a broad spectrum of clinical manifestations, varying from extremely mild to those which may rapidly lead to death if the patient is not treated as soon as possible.
Subject(s)
Antivenins/therapeutic use , Elapid Venoms/poisoning , Elapidae , Snake Bites/diagnosis , Snake Bites/therapy , Adolescent , Animals , Brazil , Humans , Male , Severity of Illness Index , Young AdultABSTRACT
Um inventário estruturado de serpentes foi realizado na Base Operacional Geólogo Pedro de Moura (BOGPM), localizada na Bacia Petrolífera de Urucu, Município de Coari, Amazonas, nos anos de 2003, 2004 e 2007. Nas quatro expedições realizadas (51 dias de coleta) foram registradas 47 espécies de serpentes, pertencentes a sete famílias e 33 gêneros. Foram utilizados quatro métodos complementares de amostragem de serpentes: armadilha de interceptação e queda, encontros ocasionais, procura limitada por tempo a pé e procura limitada por tempo de carro. Das 47 espécies coletadas, Liophis reginae (n= 14), Philodryas viridissima (n= 9), Philodryas boulengeri (n= 7) e Oxybelis fulgidus (n= 7) foram as mais abundantes em toda região. O maior número de espécies e espécimes foi registrado pela procura limitada por tempo de carro (52,8%). Estudos anteriores indicam que as localidades ao sul do Rio Amazonas (como região Leste do Pará, Usina Hidrelétrica de Tucuruí, Estado do Pará, e de Samuel, Estado de Rondônia) apresentam maior riqueza quando comparadas às regiões ao norte do Amazonas (como Município de Manaus, Reserva do INPA-WWF e Usina Hidrelétrica de Balbina, Estado do Amazonas). Desta forma, é possível inferir que o levantamento das serpentes da região de Urucu ainda não esteja completo, sendo necessário um maior esforço de coleta para que novos registros sejam adicionados para a área.
A structured snake inventory was carried out at the Base Operacional Geólogo Pedro de Moura (BOGPM), located at the Urucu Petrol Basin, Municipality of Coari, Amazonas, during 2003, 2004 and 2007. Throughout four sampling expeditions (51 collection days), seven species of snakes, belonging to seven families and 33 genera, were recorded. Four complementary sampling methods were used: pitfall traps with drift fence, occasional encounters, time-limited search on foot and time-limited search by car. Of the 47 collected species Liophis reginae (n= 14), Philodryas viridissima (n= 9), Philodryas boulengeri (n= 7) and Oxybelis fulgidus (n= 7) were the most abundant in the region. The highest number of species and specimens was obtained by the time-limited search by car (n=52.8%). Previous studies indicate that localities south of the Amazonas river (such as the eastern region of Pará and Tucuruí, state of Para, and Samuel Hydroelectric Plants, state of Rondônia) present a greater richness when compared to those north of the Amazonas river (such as the mucipality of Manaus, INPA-WWF Reserve and Balbina Hydroelectric Plant, state of Amazonas).Thus, it is possible to infer that the snake inventory in Urucu region is not yet complete, requiring more sampling efforts so that new records can be obtained for the area.
