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Vences Miguel - One of the best experts on this subject based on the ideXlab platform.
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FIGURE 5 in A distinctive new species of chameleon of the genus Furcifer (Squamata: Chamaeleonidae) from the Montagne d’Ambre rainforest of northern Madagascar
2018Co-Authors: Glaw Frank, Köhler Jörn, Vences MiguelAbstract:FIGURE 5. (A) Preserved male holotype of Furcifer bifidus (MNHN 6660) in comparison to (B) preserved male holotype of Furcifer timoni sp. nov. (ZSM 2103 / 2007)
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FIGURE 6 in A distinctive new species of chameleon of the genus Furcifer (Squamata: Chamaeleonidae) from the Montagne d’Ambre rainforest of northern Madagascar
2018Co-Authors: Glaw Frank, Köhler Jörn, Vences MiguelAbstract:FIGURE 6. Female Furcifer cf. timoni from Marojejy National Park (Photograph by G. Gomboc)
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FIGURE 4 in A distinctive new species of chameleon of the genus Furcifer (Squamata: Chamaeleonidae) from the Montagne d’Ambre rainforest of northern Madagascar
2018Co-Authors: Glaw Frank, Köhler Jörn, Vences MiguelAbstract:FIGURE 4. Gravid female paratype of Furcifer timoni sp. nov., ZSM uncatalogued (FGZC 1884) in life
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FIGURE 2 in A distinctive new species of chameleon of the genus Furcifer (Squamata: Chamaeleonidae) from the Montagne d’Ambre rainforest of northern Madagascar
2018Co-Authors: Glaw Frank, Köhler Jörn, Vences MiguelAbstract:FIGURE 2. Drawing of the head of the male holotype of Furcifer timoni sp. nov., ZSM 2103 / 2007 (by Ruth Kühbandner)
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FIGURE 3 in A distinctive new species of chameleon of the genus Furcifer (Squamata: Chamaeleonidae) from the Montagne d’Ambre rainforest of northern Madagascar
2018Co-Authors: Glaw Frank, Köhler Jörn, Vences MiguelAbstract:FIGURE 3. Drawings of hemipenis of the male holotype of Furcifer timoni sp. nov., ZSM 2103 / 2007 (by Ruth Kühbandner): (A) asulcal view, (B) lateral view; (C) sulcal view
Mawlouth Diallo - One of the best experts on this subject based on the ideXlab platform.
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Concurrent amplification of Zika, chikungunya, and yellow fever virus in a sylvatic focus of arboviruses in Southeastern Senegal, 2015.
BMC Microbiology, 2020Co-Authors: Diawo Diallo, Tidiane Diagne, Ousmane Faye, Gamou Fall, Alioune Gaye, Ibrahima Dia, Mawlouth DialloAbstract:Chikungunya (CHIKV), yellow fever (YFV) and Zika (ZIKV) viruses circulate in sylvatic transmission cycles in southeastern Senegal, where they share common hosts and vectors. All three viruses undergo periodic amplifications, during which they are detected in mosquitoes and sometimes in hosts. However, little is known about their spatio-temporal patterns in years in which they undergo concurrent amplification. The aim of this study was to describe the co-amplification of ZIKV, CHIKV, and YFV, and the daily dynamics of these arboviruses and theirs vectors within villages in southeastern Senegal. Mosquitoes were collected monthly from July to December 2015. Each evening, from 6 to 9 PM, landing collections were performed by teams of 3 persons working simultaneously in 70 sites situated in forest (canopy and ground), savannah, agriculture, barren, and village (indoor and outdoor) land covers. Collections within villages were continued until 6 AM. Mosquitoes were tested for virus infection by virus isolation and RT-PCR. Seventy-five mosquito pools comprising 10 mosquito species contained at least one virus. Ae. Furcifer and Ae. luteocephalus were infected by all three viruses, Ae. taylori by YFV and ZIKV, and remaining seven species by only, only YFV or only ZIKV. No single mosquito pool contained more than one virus. CHIKV was the only virus detected in all land cover classes and was found in the greatest number of sampling sites (32.9%, n = 70). The proportion of sites in which more than one virus was detected was less than 6%. Ae. aegypti formosus, Ae. Furcifer, Ae. luteocephalus, Ae. minutus, Ae. vittatus, and An. gambiae were found within villages. These vectors were mainly active around dusk but Ae. Furcifer was collected until dawn. All viruses save ZIKV were detected indoors and outdoors, mainly around dusk. Virus positive pools were detected over 2, 3 and 4 months for YFV, CHIKV and ZIKV, respectively. Our data indicate that the distribution of different vector species and different arboviruses vary substantially between sites, suggesting that CHIKV, YFV, and ZIKV may have different transmission cycles in Southeastern Senegal.
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Patterns of a Sylvatic Yellow Fever Virus Amplification in Southeastern Senegal, 2010
The American Journal of Tropical Medicine and Hygiene, 2014Co-Authors: Diawo Diallo, Amadou A. Sall, Tidiane Diagne, Oumar Faye, Kathryn A. Hanley, Michaela Buenemann, Ousmane Faye, Scott C. Weaver, Mawlouth DialloAbstract:During the wet season of 2010, yellow fever virus (YFV) was detected in field-collected mosquitoes in the Kedougou region in southeastern Senegal. During this outbreak, we studied the association of the abundance of YFV-infected mosquitoes and land cover features to try and understand the dynamics of YFV transmission within the region. In total, 41,234 mosquito females were collected and tested for virus infection in 5,152 pools. YFV was detected in 67 pools; species including Aedes Furcifer (52.2% of the infected pools), Ae. luteocephalus (31.3% of the infected pools), Ae. taylori (6.0% of the infected pools) and six other species (10.4% of the infected pools) captured in September (13.4%), October (70.1%), and November (16.4%). Spatially, YFV was detected from mosquitoes collected in all land cover classes but mainly, forest canopies (49.2%). Human infection is likely mediated by Ae. Furcifer, the only species found infected with YFV within villages. Villages containing YFV-infected mosquitoes were significantly closer to large forests (> 2 ha) than villages in which no infected mosquitoes were detected.
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First evidence of natural vertical transmission of yellow fever virus in Aedes aegypti, its epidemic vector.
Transactions of the Royal Society of Tropical Medicine and Hygiene, 1997Co-Authors: Didier Fontenille, Mawlouth Diallo, M. Mondo, M. Ndiaye, J. ThonnonAbstract:Abstract Entomological investigations were conducted in 1995 in Senegal, following a yellow fever (YF) outbreak. A total of 1125 mosquitoes collected in the field, including males, females and 12–48 h old newly emerged adults reared from wild-caught larvae, were tested for YF virus. Among the 22 species captured, Aedes aegypti was the most common. ‘Wild’ vectors of YF were also captured, including A. Furcifer, A. metallicus and A. luteocephalus. In all, 28 YF virus isolations were made: 19 from A. aegypti females, including 2 from newly emerged specimens; 5 were obtained from A. aegypti males, including one from a pool of newly emerged specimens, 2 from A. Furcifer females, and one each from a female A. metallicus and a female A. luteocephalus. The true infection rates (TIRs) were much higher in adult A. aegypti than in specimens reared from larvae—8·2% and 31·4% for female and male A. aegypti captured on human volunteers, respectively (P 0·05). This outbreak was an intermediate YF epidemic, involving 4 vector species. Our data provide the first evidence of vertical transmission of YF virus in nature by A. aegypti, its main vector to humans, and strongly suggest that vertical transmission played a major role in the spread of the epidemic.
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Surveillance for Yellow Fever Virus in Eastern Senegal During 1993
Journal of Medical Entomology, 1996Co-Authors: Moumouni Traore-lamizana, Didier Fontenille, Hervé Zeller, Mireille Mondo, Mawlouth Diallo, Francois Adam, Marcel Eyraud, Abdourahmane Maiga, J.p. DigoutteAbstract:During the 1993 rainy season, 15,806 mosquitoes, including 14,304 Aedes ssp., were collected and tested for virus infection in 702 and 547 pools, respectively. Aedes Furcifer (Edwards) was the most abundant species collected througout the survey period. Yellow fever (YF) virus was detected in 187 pools: Ae. Furcifer (123 isolates), Ae. taylori (Edwards) (41 isolates), and Ae. luteocephalus (Newstead) (23 isolates). A high prevalence of immunoglobulin (IgG) antibodies was found in human and simian populations. Results clearly indicated that increased sylvatic YF activity in eastern Senegal has the increased the risk of YF transmission among rural populations in West Africa. Our results showed that a minimal survey period may be effective in detecting the circulation of YF in the Kedougou area.
Miguel Vences - One of the best experts on this subject based on the ideXlab platform.
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BEAST tree, 6 genes, Calumma+Furcifer and position of Rampholeon constrained
2016Co-Authors: Krystal A. Tolley, Ted M. Townsend, Miguel VencesAbstract:Time calibrated BEAST tree, 6 genes, topological constraints enforced: Calumma+Furcifer and position of Rhampholeon as in 13-gene analysis
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BEAST tree 6 genes Calumma+Furcifer constrained
2016Co-Authors: Krystal A. Tolley, Ted M. Townsend, Miguel VencesAbstract:Time-calibrated BEAST output tree of all taxa studied (6 genes), monophyly of large Madagascar chameleons constrained (Calumma+Furcifer)
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ML tree, Calumma+Furcifer constrained
2016Co-Authors: Krystal A. Tolley, Ted M. Townsend, Miguel VencesAbstract:Maximum Likelihood tree of all taxa studied (6 genes, partition by genes), monophyly of large Madagascar chameleons constrained (Calumma+Furcifer)
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A distinctive new species of chameleon of the genus Furcifer (Squamata: Chamaeleonidae) from the Montagne dAmbre rainforest of northern Madagascar
Zootaxa, 2009Co-Authors: Frank Glaw, Jörn Köhler, Miguel VencesAbstract:We describe Furcifer timoni sp. nov., a new colourful and morphologically highly distinct chameleon from Montagne d’Ambre National Park in northern Madagascar. Males of this rainforest species are characterized by short paired bony rostral appendages which are completely absent in females. The new species differs from all other Furcifer species except F. bifidus (Brongniart, 1800) and F. balteatus (Dumeril & Bibron, 1851) by a light ventrolateral band that is composed of scales which are arranged in a rosette-like manner. It differs from F. bifidus and from F. balteatus by smaller size, shorter rostral appendages of the males, and colouration. We suspect that F. timoni may be a cryptic species of the forest canopy. Furthermore, we designate a lectotype for Dicranosaura bifurca var. crassicornis Gray, 1864 and confirm its synonymy with Furcifer bifidus.
Christopher J. Raxworthy - One of the best experts on this subject based on the ideXlab platform.
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A Phylogeographic Assessment of the Malagasy Giant Chameleons (Furcifer verrucosus and Furcifer oustaleti)
PLOS ONE, 2016Co-Authors: Antonia M. Florio, Christopher J. RaxworthyAbstract:The Malagasy giant chameleons (Furcifer oustaleti and Furcifer verrucosus) are sister species that are both broadly distributed in Madagascar, and also endemic to the island. These species are also morphologically similar and, because of this, have been frequently misidentified in the field. Previous studies have suggested that cryptic species are nested within this chameleon group, and two subspecies have been described in F. verrucosus. In this study, we utilized a phylogeographic approach to assess genetic diversification within these chameleons. This was accomplished by (1) identifying clades within each species supported by both mitochondrial and nuclear DNA, (2) assessing divergence times between clades, and (3) testing for niche divergence or conservatism. We found that both F. oustaleti and F. verrucosus could be readily identified based on genetic data, and within each species, there are two well-supported clades. However, divergence times are not contemporary and spatial patterns are not congruent. Diversification within F. verrucosus occurred during the Plio-Pleistocene, and there is evidence for niche divergence between a southwestern and southeastern clade, in a region of Madagascar that shows no obvious landscape barriers to dispersal. Diversification in F. oustaleti occurred earlier in the Pliocene or Miocene, and niche conservatism is supported with two genetically distinct clades separated at the Sofia River in northwestern Madagascar. Divergence within F. verrucosus is most consistent with patterns expected from ecologically mediated speciation, whereas divergence in F. oustaleti most strongly matches the patterns expected from the riverine barrier hypothesis.
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Morphological variation in Furcifer oustaleti and Furcifer verrucosus.
2016Co-Authors: Antonia M. Florio, Christopher J. RaxworthyAbstract:Morphological variation in Furcifer oustaleti and Furcifer verrucosus.
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Genetic divergence within the F. oustaleti and F. verrucosus species complexes.
2016Co-Authors: Antonia M. Florio, Christopher J. RaxworthyAbstract:(a) Phylogenetic relationships between the Furcifer verrucosus complex, the Furcifer oustaleti complex, and near outgroups using partial fragments of the mitochondrial genes ND2 and ND4, reconstructed on the ML tree. (BI/ML/MP; ** = 100%). Only groups with nuclear support are labeled as “clades” on the tree. (b–c) The median-joining haplotype networks for the nuclear gene CMOS (b) and RAG1 (c) also recover support for the Furcifer verrucosus complex and the Furcifer oustaleti complex with some differentiation within each species. (d) Results from the structure analysis including both the mitochondrial and nuclear data when k = 4. Mitochondrial clades with nuclear support are labeled A-D on the mitochondrial tree.
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Behavioral Field Study
2015Co-Authors: Emlyn J. Resetarits, Christopher J. RaxworthyAbstract:Responses to a "predatory threat" by 57 Furcifer viridis and 4 Calumma gastrotaenia specimens collected between 9-19th January 2011 in the Makay Massif, Madagascar at three sites: Antsoha Forest 21.596°S, 45.114°E; Androtsy Forest 21.569°S, 45.076°E; and Ankilytsoky 21.674°S, 44.993°E. Presence or absence of lateral and ventral line markings are recorded for each specimen in addition to their response to a predatory threat.
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Development of ten polymorphic microsatellite loci for three closely related chameleons in Madagascar: Furcifer lateralis, Furcifer major , and Furcifer viridis
Conservation Genetics Resources, 2012Co-Authors: Antonia M. Florio, Bryan G. Falk, Christopher J. RaxworthyAbstract:The three chameleon species Furcifer lateralis, Furcifer viridis, and Furcifer major are endemic to Madagascar, and are of conservation importance because they are exported in high numbers in the pet trade. These species represent a recently evolved species complex, with relatively low levels of genetic differentiation for nuclear genes. We here characterize 10 polymorphic microsatellite loci that are variable across the three species. These loci are the first microsatellites to be developed for any Malagasy chameleon. Allelic diversity greatly differs among loci, ranging from 4 to 40. This is also true of observed heterozygosity, with values ranging from 0 to 0.96. These microsatellite loci are expected to be useful for detecting potential hybridization at the contact zones between these species.
Kluge, Nikita J. - One of the best experts on this subject based on the ideXlab platform.
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FIGURES 1 – 4 in Two new species of Tricorythus Eaton 1868 (Ephemeroptera, Tricorythidae) from Zambia
2016Co-Authors: Kluge, Nikita J.Abstract:FIGURES 1 – 4. Tricorythus Furcifer sp. n., last instar larvae: 1, male larva, dorsal view; 2, the same, ventral view; 3, 4, female larvae
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FIGURES 9 – 16. 9 – 14 in Two new species of Tricorythus Eaton 1868 (Ephemeroptera, Tricorythidae) from Zambia
2016Co-Authors: Kluge, Nikita J.Abstract:FIGURES 9 – 16. 9 – 14, Tricorythus Furcifer sp. n.: 9, left half of exuviae of subimaginal mesonotum; 10, subimaginal and imaginal penis with gonoducts and left gonad, extracted from mature larva; 11, exuviae of subimaginal fore leg; 12, exuviae of subimaginal abdomen; 13, imaginal genitals (holotype); 14, the same, enlarged fragment (arrows show globular papillae); 15, Tricorythus tener sp. n., imaginal genitals (holotype); 16, the same, paratype
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FIGURES 5 – 8 in Two new species of Tricorythus Eaton 1868 (Ephemeroptera, Tricorythidae) from Zambia
2016Co-Authors: Kluge, Nikita J.Abstract:FIGURES 5 – 8. Tricorythus Furcifer sp. n. 5, middle leg of larva, anterior view (holotype); 6, genitals of male imago, lateral view; 7, ninths sternum and protopenis of mature male larva with developing subimaginal and imaginal genitals inside, dorsal view (hidden parts of subimaginal and imaginal cuticle shown by interrupted and dotted lines; gonads and gonoducts shown by dotted lines); 8, genital of male imago, dorsal view (gonoducts shown by dotted lines)
