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[PMID]:28453670
[Au] Autor:Adams RH; Schield DR; Card DC; Blackmon H; Castoe TA
[Ad] Endereço:Department of Biology, The University of Texas at Arlington, Arlington, TX 76019, USA.
[Ti] Título:GppFst: genomic posterior predictive simulations of FST and dXY for identifying outlier loci from population genomic data.
[So] Source:Bioinformatics;33(9):1414-1415, 2017 May 01.
[Is] ISSN:1367-4811
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Summary: We introduce GppFst, an open source R package that generates posterior predictive distributions of FST and dx under a neutral coalescent model to identify putative targets of selection from genomic data. Availability and Implementation: GppFst is available at ( https://github.com/radamsRHA/GppFst ). Contact: todd.castoe@uta.edu. Supplementary information: Supplementary data are available at Bioinformatics online.
[Mh] Termos MeSH primário: Loci Gênicos
Genética Populacional/métodos
Modelos Genéticos
Polimorfismo de Nucleotídeo Único
Software
[Mh] Termos MeSH secundário: Algoritmos
Animais
Crotalus/genética
Genoma
Genômica/métodos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180308
[Lr] Data última revisão:
180308
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170429
[St] Status:MEDLINE
[do] DOI:10.1093/bioinformatics/btw795


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[PMID]:29176824
[Au] Autor:Mendonça-da-Silva I; Magela Tavares A; Sachett J; Sardinha JF; Zaparolli L; Gomes Santos MF; Lacerda M; Monteiro WM
[Ad] Endereço:Escola Superior de Saúde, Universidade do Estado do Amazonas, Manaus, Amazonas, Brazil.
[Ti] Título:Safety and efficacy of a freeze-dried trivalent antivenom for snakebites in the Brazilian Amazon: An open randomized controlled phase IIb clinical trial.
[So] Source:PLoS Negl Trop Dis;11(11):e0006068, 2017 Nov.
[Is] ISSN:1935-2735
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: In tropical areas, a major concern regarding snakebites treatment effectiveness relates to the failure in liquid antivenom (AV) distribution due to the lack of an adequate cold chain in remote areas. To minimize this problem, freeze-drying has been suggested to improve AV stability. METHODS AND FINDINGS: This study compares the safety and efficacy of a freeze-dried trivalent antivenom (FDTAV) and the standard liquid AV provided by the Brazilian Ministry of Health (SLAV) to treat Bothrops, Lachesis and Crotalus snakebites. This was a prospective, randomized, open, phase IIb trial, carried out from June 2005 to May 2008 in the Brazilian Amazon. Primary efficacy endpoints were the suppression of clinical manifestations and return of hemostasis and renal function markers to normal ranges within the first 24 hours of follow-up. Primary safety endpoint was the presence of early adverse reactions (EAR) in the first 24 hours after treatment. FDTAV thermal stability was determined by estimating AV potency over one year at 56°C. Of the patients recruited, 65 and 51 were assigned to FDTAV and SLAV groups, respectively. Only mild EARs were reported, and they were not different between groups. There were no differences in fibrinogen (p = 0.911) and clotting time (p = 0.982) recovery between FDTAV and SLAV treated groups for Bothrops snakebites. For Lachesis and Crotalus snakebites, coagulation parameters and creatine phosphokinase presented normal values 24 hours after AV therapy for both antivenoms. CONCLUSIONS/SIGNIFICANCE: Since promising results were observed for efficacy, safety and thermal stability, our results indicate that FDTAV is suitable for a larger phase III trial. TRIAL REGISTRATION: ISRCTNregistry: ISRCTN12845255; DOI: 10.1186/ISRCTN12845255 (http://www.isrctn.com/ISRCTN12845255).
[Mh] Termos MeSH primário: Antivenenos/administração & dosagem
Bothrops
Crotalus
Mordeduras de Serpentes/terapia
[Mh] Termos MeSH secundário: Adolescente
Adulto
Animais
Antivenenos/efeitos adversos
Coagulação Sanguínea
Brasil
Criança
Pré-Escolar
Feminino
Fibrinogênio/análise
Liofilização
Seres Humanos
Lactente
Recém-Nascido
Masculino
Meia-Idade
Estudos Prospectivos
Resultado do Tratamento
Adulto Jovem
[Pt] Tipo de publicação:CLINICAL TRIAL, PHASE II; JOURNAL ARTICLE; RANDOMIZED CONTROLLED TRIAL
[Nm] Nome de substância:
0 (Antivenins); 9001-32-5 (Fibrinogen)
[Em] Mês de entrada:1712
[Cu] Atualização por classe:171219
[Lr] Data última revisão:
171219
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171128
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pntd.0006068


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[PMID]:28867438
[Au] Autor:Cavalcante WLG; Noronha-Matos JB; Timóteo MA; Fontes MRM; Gallacci M; Correia-de-Sá P
[Ad] Endereço:Departamento de Farmacologia, Instituto de Ciências Biológicas, UFMG, Av. Antônio Carlos, 6627 Belo Horizonte, Brazil; Laboratório de Farmacologia e Neurobiologia, Instituto de Ciências Biomédicas Abel Salazar - Universidade do Porto (ICBAS-UP), R. Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portug
[Ti] Título:Neuromuscular paralysis by the basic phospholipase A subunit of crotoxin from Crotalus durissus terrificus snake venom needs its acid chaperone to concurrently inhibit acetylcholine release and produce muscle blockage.
[So] Source:Toxicol Appl Pharmacol;334:8-17, 2017 Nov 01.
[Is] ISSN:1096-0333
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:BACKGROUND AND PURPOSE: Crotoxin (CTX), a heterodimeric phospholipase A (PLA ) neurotoxin from Crotalus durissus terrificus snake venom, promotes irreversible blockade of neuromuscular transmission. Indirect electrophysiological evidence suggests that CTX exerts a primary inhibitory action on transmitter exocytosis, yet contribution of a postsynaptic action of the toxin resulting from nicotinic receptor desensitization cannot be excluded. Here, we examined the blocking effect of CTX on nerve-evoked transmitter release measured directly using radioisotope neurochemistry and video microscopy with the FM4-64 fluorescent dye. EXPERIMENTAL APPROACH: Experiments were conducted using mice phrenic-diaphragm preparations. Real-time fluorescence video microscopy and liquid scintillation spectrometry techniques were used to detect transmitter exocytosis and nerve-evoked [ H]-acetylcholine ([ H]ACh) release, respectively. Nerve-evoked myographic recordings were also carried out for comparison purposes. KEY RESULTS: Both CTX (5µg/mL) and its basic PLA subunit (CB, 20µg/mL) had biphasic effects on nerve-evoked transmitter exocytosis characterized by a transient initial facilitation followed by a sustained decay. CTX and CB reduced nerve-evoked [ H]ACh release by 60% and 69%, respectively, but only the heterodimer, CTX, decreased the amplitude of nerve-evoked muscle twitches. CONCLUSION AND IMPLICATIONS: Data show that CTX exerts a presynaptic inhibitory action on ACh release that is highly dependent on its intrinsic PLA activity. Given the high safety margin of the neuromuscular transmission, one may argue that the presynaptic block caused by the toxin is not enough to produce muscle paralysis unless a concurrent postsynaptic inhibitory action is also exerted by the CTX heterodimer.
[Mh] Termos MeSH primário: Acetilcolina/antagonistas & inibidores
Venenos de Crotalídeos/toxicidade
Crotalus/fisiologia
Crotoxina/toxicidade
Chaperonas Moleculares/metabolismo
Bloqueio Neuromuscular
[Mh] Termos MeSH secundário: Acetilcolina/metabolismo
Animais
Venenos de Crotalídeos/química
Crotoxina/química
Feminino
Masculino
Camundongos
Chaperonas Moleculares/química
Músculos/efeitos dos fármacos
Neurotoxinas/toxicidade
Fosfolipases A2
Subunidades Proteicas
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Crotalid Venoms); 0 (Molecular Chaperones); 0 (Neurotoxins); 0 (Protein Subunits); 9007-40-3 (Crotoxin); EC 3.1.1.4 (Phospholipases A2); N9YNS0M02X (Acetylcholine)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171017
[Lr] Data última revisão:
171017
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170905
[St] Status:MEDLINE


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Antunes, Edson
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[PMID]:28837636
[Au] Autor:Campos R; Mónica FZ; Rodrigues RL; Rojas-Moscoso JA; Moreno RA; Cogo JC; de Oliveira MA; Antunes E; De Nucci G
[Ad] Endereço:Faculty of Medical Sciences, Department of Pharmacology, University of Campinas (UNICAMP), Campinas, Brazil.
[Ti] Título:Tetrodotoxin-insensitive electrical field stimulation-induced contractions on Crotalus durissus terrificus corpus cavernosum.
[So] Source:PLoS One;12(8):e0183766, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Reptiles are the first amniotes to develop an intromitent penis, however until now the mechanisms involved in the electrical field stimulation-induced contraction on corpora cavernosa isolated from Crotalus durissus terrificus were not investigated. Crotalus and rabbit corpora cavernosa were mounted in 10 mL organ baths for isometric tension recording. Electrical field stimulation (EFS)-induced contractions were performed in presence/absence of phentolamine (10 µM), guanethidine (30 µM), tetrodotoxin (1 µM and 1mM), A-803467 (10 µM), 3-iodo-L-Tyrosine (1 mM), salsolinol (3 µM) and a modified Krebs solution (equimolar substitution of NaCl by N-methyl-D-glucamine). Immuno-histochemistry for tyrosine hydroxylase was also performed. Electrical field stimulation (EFS; 8 Hz and 16 Hz) caused contractions in both Crotalus and rabbit corpora cavernosa. The contractions were abolished by previous incubation with either phentolamine or guanethidine. Tetrodotoxin (1 µM) also abolished the EFS-induced contractions of rabbit CC, but did not affect EFS-induced contractions of Crotalus CC. Addition of A-803467 (10 µM) did not change the EFS-induced contractions of Crotalus CC but abolished rabbit CC contractions. 3-iodo-L-Tyrosine and salsolinol had no effect on EFS-induced contractions of Crotalus CC and Rabbit CC. Replacement of NaCl by N- Methyl-D-glucamine (NMDG) abolished EFS-induced contractions of rabbit CC, but did not affect Crotalus CC. The presence of tyrosine hydroxylase was identified in endothelial cells only of Crotalus CC. Since the EFS-induced contractions of Crotalus CC is dependent on catecholamine release, insensitive to TTX, insensitive to A803467 and to NaCl replacement, it indicates that the source of cathecolamine is unlikely to be from adrenergic terminals. The finding that tyrosine hydroxylase is present in endothelial cells suggests that these cells can modulate Crotalus CC tone.
[Mh] Termos MeSH primário: Crotalus/fisiologia
Estimulação Elétrica
Pênis/efeitos dos fármacos
Tetrodotoxina/farmacologia
[Mh] Termos MeSH secundário: Compostos de Anilina/farmacologia
Animais
Callithrix
Furanos/farmacologia
Imuno-Histoquímica
Masculino
Contração Muscular/efeitos dos fármacos
Pênis/fisiologia
Coelhos
Receptores Adrenérgicos/fisiologia
Canais de Sódio/fisiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (A 803467); 0 (Aniline Compounds); 0 (Furans); 0 (Receptors, Adrenergic); 0 (Sodium Channels); 4368-28-9 (Tetrodotoxin)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171023
[Lr] Data última revisão:
171023
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170825
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0183766


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[PMID]:28632114
[Au] Autor:McLaughlin RW; Shewmaker PL; Whitney AM; Humrighouse BW; Lauer AC; Loparev VN; Gulvik CA; Cochran PA; Dowd SE
[Ad] Endereço:1​General Studies, Gateway Technical College, Kenosha, WI 53144, USA 2​Biology Department, Saint Mary's University of Minnesota, Winona, MN 55987-1399, USA.
[Ti] Título:Enterococcus crotali sp. nov., isolated from faecal material of a timber rattlesnake.
[So] Source:Int J Syst Evol Microbiol;67(6):1984-1989, 2017 Jun.
[Is] ISSN:1466-5034
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:A facultatively anaerobic, Gram-stain-positive bacterium, designated ETRF1T, was found in faecal material of a timber rattlesnake (Crotalus horridus). Based on a comparative 16S rRNA gene sequence analysis, the isolate was assigned to the genus Enterococcus. The 16S rRNA gene sequence of strain ETRF1T showed >97 % similarity to that of the type strains of Enterococcus rotai, E. caccae, E. silesiacus, E haemoperoxidus, E. ureasiticus, E. moraviensis, E. plantarum, E. quebecensis, E. ureilyticus, E. termitis, E. rivorum and E. faecalis. The organism could be distinguished from these 12 phylogenetically related enterococci using conventional biochemical testing, the Rapid ID32 Strep system, comparative pheS and rpoA gene sequence analysis, and comparative whole genome sequence analysis. The estimated in silico DNA-DNA hybridization values were <70 %, and average nucleotide identity values were <96 %, when compared to these 12 species, further validating that ETRF1T represents a unique species within the genus Enterococcus. On the basis of these analyses, strain ETRF1T (=CCUG 65857T=LMG 28312T) is proposed as the type strain of a novel species, Enterococcus crotali sp. nov.
[Mh] Termos MeSH primário: Crotalus/microbiologia
Enterococcus/classificação
Fezes/microbiologia
Filogenia
[Mh] Termos MeSH secundário: Animais
Técnicas de Tipagem Bacteriana
Composição de Bases
DNA Bacteriano/genética
Enterococcus/genética
Enterococcus/isolamento & purificação
Minnesota
Hibridização de Ácido Nucleico
RNA Ribossômico 16S/genética
Análise de Sequência de DNA
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (DNA, Bacterial); 0 (RNA, Ribosomal, 16S)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170825
[Lr] Data última revisão:
170825
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170621
[St] Status:MEDLINE
[do] DOI:10.1099/ijsem.0.001900


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[PMID]:28546068
[Au] Autor:Hillman SS; Hedrick MS; Kohl ZF
[Ad] Endereço:Department of Biology, Portland State University, Portland, OR 97207-0751, USA. Electronic address: hillmans@pdx.edu.
[Ti] Título:Commentary on: "Vascular distensibilities have minor effects on intracardiac shunt patterns in reptiles" by Filogonio et al. (2017).
[So] Source:Zoology (Jena);122:52-54, 2017 Jun.
[Is] ISSN:1873-2720
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:The recent study by Filogonio et al. (2017) suggested that net cardiac shunt patterns in two species of reptiles (Trachemys scripta and Crotalus durissus) were not significantly influenced by the vascular distensibilities of the systemic and pulmonary vasculatures. This is in contrast to a previously published study (Hillman et al., 2014) in the toad (Rhinella marina) in which net cardiac shunts were predicted primarily by the physical properties of vascular distensibility rather than physiological control of resistance of the systemic and pulmonary vasculature. We analyze the data and conclusions reached by Filogonio et al. (2017) regarding the role of vascular distensibilities in determining net cardiac shunt patterns in reptiles in comparison with toads. In our view, the conclusions reached by Filogonio et al. (2017) are not supported by the data primarily because vascular distensibilities were not measured in the reptiles analyzed in their study.
[Mh] Termos MeSH primário: Coração
Répteis
[Mh] Termos MeSH secundário: Animais
Crotalus
Tartarugas
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171026
[Lr] Data última revisão:
171026
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170527
[St] Status:MEDLINE


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[PMID]:28476866
[Au] Autor:Margres MJ; Bigelow AT; Lemmon EM; Lemmon AR; Rokyta DR
[Ad] Endereço:Department of Biological Science, Florida State University, Tallahassee, Florida 32306.
[Ti] Título:Selection To Increase Expression, Not Sequence Diversity, Precedes Gene Family Origin and Expansion in Rattlesnake Venom.
[So] Source:Genetics;206(3):1569-1580, 2017 Jul.
[Is] ISSN:1943-2631
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Gene duplication is the primary mechanism leading to new genes and phenotypic novelty, but the proximate evolutionary processes underlying gene family origin, maintenance, and expansion are poorly understood. Although sub- and neofunctionalization provide clear long-term advantages, selection does not act with foresight, and unless a redundant gene copy provides an immediate fitness advantage, the copy will most likely be lost. Many models for the evolution of genes immediately following duplication have been proposed, but the robustness and applicability of these models is unclear because of the lack of data at the population level. We used qPCR, protein expression data, genome sequencing, and hybrid enrichment to test three competing models that differ in whether selection favoring the spread of duplicates acts primarily on expression level or sequence diversity for specific toxin-encoding loci in the eastern diamondback rattlesnake ( ). We sampled 178 individuals and identified significant inter- and intrapopulation variation in copy number, demonstrated that copy number was significantly and positively correlated with protein expression, and found little to no sequence variation across paralogs in all populations. Collectively, these results demonstrate that selection for increased expression, not sequence diversity, was the proximate evolutionary process underlying gene family origin and expansion, providing data needed to resolve the debate over which evolutionary processes govern the fates of gene copies immediately following duplication.
[Mh] Termos MeSH primário: Crotalus/genética
Variações do Número de Cópias de DNA
Seleção Genética
Venenos de Serpentes/genética
[Mh] Termos MeSH secundário: Animais
Evolução Molecular
Duplicação Gênica
Família Multigênica
Venenos de Serpentes/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Snake Venoms)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171019
[Lr] Data última revisão:
171019
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170507
[St] Status:MEDLINE
[do] DOI:10.1534/genetics.117.202655


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[PMID]:28424125
[Au] Autor:McBride KM; Bromberg W; Dunne J
[Ti] Título:Thromboelastography Utilization in Delayed Recurrent Coagulopathy after Severe Eastern Diamondback Rattlesnake Envenomation.
[So] Source:Am Surg;83(4):332-336, 2017 Apr 01.
[Is] ISSN:1555-9823
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Venomous snakebites are fairly common in the United States and can present with a wide range of symptoms. A 48-year-old man presented after Eastern Diamondback rattlesnake envenomation. His hospital course was complicated by right leg compartment syndrome and delayed recurrent coagulopathy, requiring multiple doses of Crotalidae Polyvalent Immune Fab (CroFab) antivenom and transfusions. Thromboelastography was used as an adjunct to standard coagulation studies in monitoring his delayed recurrent coagulopathy.
[Mh] Termos MeSH primário: Antivenenos/uso terapêutico
Transtornos da Coagulação Sanguínea/etiologia
Transtornos da Coagulação Sanguínea/terapia
Síndromes Compartimentais/etiologia
Síndromes Compartimentais/cirurgia
Fragmentos Fab das Imunoglobulinas/uso terapêutico
Mordeduras de Serpentes/terapia
Tromboelastografia
[Mh] Termos MeSH secundário: Animais
Transfusão de Componentes Sanguíneos
Crotalus
Seres Humanos
Escala de Gravidade do Ferimento
Traumatismos da Perna/etiologia
Traumatismos da Perna/terapia
Masculino
Meia-Idade
Recidiva
Estados Unidos
[Pt] Tipo de publicação:CASE REPORTS; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Antivenins); 0 (Crotalidae Polyvalent immune Fab); 0 (Immunoglobulin Fab Fragments)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170501
[Lr] Data última revisão:
170501
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170421
[St] Status:MEDLINE


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[PMID]:28390664
[Au] Autor:Filogonio R; Alcantara Costa Leite C; Wang T
[Ad] Endereço:Zoophysiology, Department of Bioscience, Aarhus University, C.F. Møllers Allé 3, 8000 Aarhus C, Denmark. Electronic address: renatofilogonio@gmail.com.
[Ti] Título:Vascular distensibilities have minor effects on intracardiac shunt patterns in reptiles.
[So] Source:Zoology (Jena);122:46-51, 2017 Jun.
[Is] ISSN:1873-2720
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:The different vascular distensibilities of systemic and pulmonary circuits were recently proposed as an important mechanism defining the direction of cardiac shunt and the distribution of cardiac output in vertebrates with undivided cardiac ventricles. In short, the more distensible pulmonary vascular bed was proposed to accommodate a larger portion of the blood ejected from the heart when cardiac output increases. To evaluate this hypothesis, we performed a meta-analysis based on fourteen previously published studies in two species of reptiles (the freshwater turtle, Trachemys scripta, and the South American rattlesnake, Crotalus durissus) to describe how cardiac shunt patterns change when cardiac output increases. We found no general linear relation between total blood flow and systemic or pulmonary blood flows. Thus, cardiac output alterations cannot be used as a reliable reference for prediction of shunt patterns in both T. scripta and C. durissus. Hence, differential distensibilities appear to be of minor importance for the determination of cardiac shunt patterns in the species analyzed. We speculate that the lack of correlation in these phylogenetically distant species may indicate that this is a common trend within non-crocodilian reptiles.
[Mh] Termos MeSH primário: Crotalus/fisiologia
Coração/fisiologia
Tartarugas/fisiologia
Vasodilatação/fisiologia
[Mh] Termos MeSH secundário: Animais
Débito Cardíaco/fisiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE; META-ANALYSIS
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170915
[Lr] Data última revisão:
170915
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170410
[St] Status:MEDLINE


  10 / 771 MEDLINE  
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[PMID]:28343580
[Au] Autor:Putman BJ; Clark RW
[Ad] Endereço:Department of Biology, San Diego State University, 5500 Campanile Drive, San Diego, CA 92182, USA; Department of Ecology and Evolutionary Biology, University of California, 621 Young Drive South, Los Angeles, CA 90095-1606, USA; Department of Herpetology, The Natural History Museum of Los Angeles County, 9000 Exposition Blvd., Los Angeles, CA 90007, USA. Electronic address: putman.bree@gmail.com.
[Ti] Título:Behavioral thermal tolerances of free-ranging rattlesnakes (Crotalus oreganus) during the summer foraging season.
[So] Source:J Therm Biol;65:8-15, 2017 Apr.
[Is] ISSN:0306-4565
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Increasing temperature due to climate change is one of the greatest challenges for wildlife worldwide. Behavioral data on free-ranging individuals is necessary to determine at what temperatures animals modify activity as this would determine their capacity to continue to move, forage, and mate under altered thermal regimes. In particular, high temperatures could limit available surface activity time and time spent on fitness-related activities. Conversely, performance, such as feeding rate, can increase with temperature potentially having positive fitness effects. Here, we examine how the hunting behaviors of free-ranging Northern Pacific Rattlesnakes (Crotalus oreganus) associate with air temperature and body temperature. We continuously recorded snakes in the field using videography, capturing behaviors rarely considered in past studies such as movements in and out of refuge and strikes on prey. We found that as mean daily air temperature increased, hunting activity and the likelihood of hunting at night decreased, while the number of movements and distance moved per day increased. Snakes typically retreated to refuge before body temperatures reached 31°C. Body temperatures of snakes hunting on the surface were lower compared to temperatures of non-hunting snakes in refuge in the morning, while this relationship was inverted in the afternoon. Snake body size influenced the disparity of these temperatures. Finally, strike initiation and success occurred across a wide range of body temperatures, indicating hunting performance may not be strongly constrained by temperature. These results on the temperatures at which free-ranging rattlesnakes exhibit fitness-related behaviors could be valuable for understanding their vulnerabilities to future climates.
[Mh] Termos MeSH primário: Crotalus/fisiologia
Comportamento Predatório
[Mh] Termos MeSH secundário: Animais
Temperatura Corporal
Mudança Climática
Estações do Ano
Temperatura Ambiente
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170510
[Lr] Data última revisão:
170510
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170328
[St] Status:MEDLINE



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BIREME/OPAS/OMS - Centro Latino-Americano e do Caribe de Informação em Ciências da Saúde