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20 resultados encontrados para: AUTOR: Charruau, Pierre Alexandre Rémy Robert
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1.
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Record of haementeria acuecueyetzin (Oceguera-Figueroa, 2008) in morelet’s crocodiles from Quintana Roo, Mexico
Charruau, Pierre Alexandre Rémy Robert (autor) ; Oceguera Figueroa, Alejandro (autor) ; Cedeño-Vázquez, J.R. (autor) ; Pérez Rivera, Sergio David (autor) ;
Disponible en línea
Contenido en: Comparative Parasitology Volumen 87, número 1 (2020), p. 89-92 ISSN: 1525-2647
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Herein, we present the first Mexican record of Morelet’s crocodile, Crocodylus moreletii, as a host for the proboscis-bearing leech, Haementeria acuecueyetzin. From November 2004 to October 2017, we captured 111 crocodiles during spotlight surveys in lagoons of the Dziuché ejido, municipality of José María Morelos, Quintana Roo, Mexico. Twenty-one (18.9%) individuals had leeches identified as H. acuecueyetzin. It is the first report of H. acuecueyetzin for the State of Quintana Roo, Mexico, and the northernmost record of the species. This is also the second case of leech parasitism in C. moreletii. Haementeria acuecueyetzin likely parasitize a large array of vertebrates, and its role as apotential vector of blood parasites in C. moreletii requires further investigation.


3.
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Evidence for wild crocodiles as a risk for human Leptospirosis, Mexico
Pérez Flores, Jonathan Sechaly (coaut.) ; Charruau, Pierre Alexandre Rémy Robert (coaut.) ; Cedeño-Vázquez, J.R. (coaut.) ; Atilano, Daniel (coaut.) ;
Contenido en: EcoHealth Vol. 14, no. 1 (March 2017), p. 58–68 ISSN: 1612-9210
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Sentinel species such as crocodilians are used to monitor the health of ecosystems. However, few studies have documented the presence of zoonotic diseases in wild populations of these reptiles. Herein we analyzed 48 serum samples from Crocodylus acutus (n = 34) and C. moreletii (n = 14) from different sites in the state of Quintana Roo (Mexico) to detect antibodies to Leptospira interrogans by means of a microscopic agglutination test (MAT). Crocodylus acutus and C. moreletii tested positive to 11 and 9 serovars, respectively, with Grippotyphosa being the serovar with the highest prevalence in Cozumel island (100%), Banco Chinchorro Biosphere Reserve (70.6%), and Río Hondo (100%), while in Chichankanab Lake, it was Bratislava (75%). Titers ranged from 1:50 to 1:3200, and the most frequent was 1:50 in all study sites. Leptospira is present in fresh and saltwater individuals due to the resistance of the bacterium in both environments. Cases of infected people involved with crocodile handling and egg collection suggest that these reptiles could play an important role in the transmission of leptospirosis. Preventive medicine programs should consider the monitoring of reptiles, and testing the soil and water, to prevent outbreaks of leptospirosis in facilities containing crocodiles.


4.
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Morphological diversity of the American crocodile (Crocodylus acutus) in the Yucatán Peninsula
Labarre, Didier ; Charruau, Pierre Alexandre Rémy Robert (coaut.) ; Platt, S. G. (coaut.) ; Rainwater, T. R. (coaut.) ; Cedeño-Vázquez, J.R. (coaut.) ; González Cortés, H. (coaut.) ;
Contenido en: Zoomorphology (2017) 136:387–401 Vol. 136, no. 3 (September 2017), p. 387-401 ISSN: 1432-234X
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Recent evidence suggests that morphological divergence of the American crocodile (Crocodylus acutus) occurred in Greater Antilles under conditions of prolonged isolation and hybridization with the Cuban crocodile (C. rhombifer). We investigated morphological diversity in C. acutus in the coastal zone of the Yucatán Peninsula, where isolation and hybridization have also been reported. We compared the relationships among various morphological traits between insular and coastal populations. Our results suggest morphological diversity in the region, which is possibly related to population isolation and mechanical constraints imposed by differences in diet. A broad-snouted morphotype appears typical of island populations. Hybridization could also cause morphological variation, but its importance in this case remains to be confirmed. Sexual dimorphism of the American crocodile in the region appears to be less pronounced than for other crocodilians. We also provide population-specific size estimation models for two populations (Banco Chinchorro and Cozumel) to improve future monitoring.


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Skin parasitism by Paratrichosoma recurvum in wild American crocodiles and its relation to environmental and biological factors
Charruau, Pierre Alexandre Rémy Robert (autor) ; Pérez Flores, Jonathan Sechaly (autor) ; Labarre, Didier (autor) ;
Contenido en: Vol. 122, no. 3 (January 2017), p. 205-211 ISSN: 0177-5103
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Paratrichosma spp. are capillarid worms that parasitize the abdominal skin of crocodiles. They are likely not a threat to crocodiles' health, but they affect the skins' commercial value. No successful treatment exists against this parasite, and present knowledge of its life cycle is limited. Herein we report new information on Paratrichosoma recurvum occurrence in wild American crocodiles Crocodylus acutus from Mexican Caribbean islands and its relation to environmental (water salinity, temperature, climatic events) and biological (body condition) factors. The percentage of parasitized crocodiles (30.3%) is among the highest recorded in wild crocodilian populations. Small (<40.8 cm total length [TL]) and large (>270 cm TL) crocodiles are less parasitized, probably due to the characteristics of their skin or of the parasite life cycle. Two individuals appeared to have eliminated worms naturally between their capture and recapture. The thorax-abdomen is the most parasitized area of the body of crocodiles. The risk of infection is not associated with the sex of the crocodile, but there was a difference in the proportion of parasitized crocodiles between sites, which could be related to different environmental conditions. The body condition of a crocodile does not seem to be affected by the parasite. Climatic events and water temperature show no effect on the parasitism of crocodiles, but salinity could have an effect. The infection of crocodiles by P. recurvum could depend more on an individual's behavior than on environmental conditions.


6.
Artículo - Nota científica con arbitraje
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Ticks are common ectoparasites of amphibians and reptiles but very few reports of such parasites on crocodylians exist worldwide. Herein, we report the first detailed observations of Amblyomma dissimile Koch, 1844 on the 3 crocodylian species present in Mexico, with the first report of tick parasitism on Crocodylus acutus and the second on Caiman crocodilus chiapasius. This is also the first report of A. dissimile in the state of Quintana Roo. Proportions of infested individuals found in this study ranged from 0.51 to 1.96%, suggesting that tick parasitism in crocodylians is likely opportunistic and occurs when individuals leave the water for terrestrial activities. Tick parasitism does not represent a major threat to crocodylians. The increasing habitat destruction/fragmentation and cattle expansion in southeastern Mexico, however, could increase tick populations and trigger tick parasitism and tick-borne diseases in herpetofauna and other vertebrates, including humans. Thus, studies are needed to better understand these relationships.


7.
- Capítulo de libro con arbitraje
Amphibians and reptiles
Charruau, Pierre Alexandre Rémy Robert ; Cedeño-Vázquez, J.R. (coaut.) ; Köhler, Gunther (coaut.) ;
Contenido en: Biodiversity and conservation of the Yucatan Peninsula New York : Springer International Publishing Switzerland, 2015 p. 257-293 ISBN:978-3-319-06528-1
Resumen en: Inglés |
Resumen en inglés

The three Mexican states of the Yucatán Peninsula have been relatively well explored for herpetofauna, when compared with other states of the country. However, most studies on the herpetofauna of the Yucatán Peninsula have focused on their diversity, taxonomy, and species distribution, and less on their ecology, behavior or conservation status. The major conservation efforts have focused on sea turtles. Although some conservation programs exist locally for crocodiles in the north of the peninsula, to date conservation strategies have mostly been restricted to the designation of protected areas. With 24 species of amphibians and 118 species of reptiles, the Yucatán Peninsula harbors 11.5 % of national herpetofauna diversity, and 19 % of species are endemic to the peninsula. Reptiles and amphibians are two major globally threatened groups of vertebrates, with amphibians being the most threatened vertebrate class. Both groups face the same threats, namely habitat loss and modification, pollution, overharvest for food and pet trade, introduction of exotic species, infectious diseases, and climatic change. Unfortunately, almost none of these issues have been investigated for key populations in the Yucatán Peninsula. For amphibians, studies exploring the presence of the chytrid fungus (Batracho- chytrium dendrobatidis) and the effects of climatic change are badly needed to understand the specific factors that negatively affect populations in this area. In general, conservation efforts for reptiles and amphibians in the Yucatán Peninsula need to include environmental education, scientific investigation, and law enforcement and application.


8.
Tesis - Maestría
Condición corporal del cocodrilo americano (Crocodylus acutus) en el Parque Nacional Arrecifes de Xcalak, Quintana Roo, México / Fernando González Ávila
González Ávila, Fernando ; González Solís, David (tutor) ; Cedeño-Vázquez, J.R. (asesor) ; Charruau, Pierre Alexandre Rémy Robert (asesor) ; Sosa Cordero, Eloy (asesor) ;
Chetumal, Quintana Roo, México : El Colegio de la Frontera Sur , 2015
Clasificación: TE/597.98097267 / G6
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ECO040006048 (Disponible)
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Índice | Resumen en: Español |
Resumen en español

Esta investigación tuvo como objetivo principal determinar y evaluar la condición corporal del cocodrilo americano (Crocodylus acutus) en cuatro lagunas costeras del Parque Nacional Arrecifes de Xcalak, Quintana Roo, México. Se utilizó la relación pesoperímetro de la base de la cola para aplicar el factor de condición de Fulton a los datos de 44 cocodrilos obtenidos a partir de una base de datos de 2006 (n = 26) y muestreos en 2012 (n = 18). Se analizó la condición corporal por periodo (2006 vs 2012), sitio de muestreo, clase de talla, sexo, salinidad, temperatura del agua y temporada climática. En general, C. acutus presentó una buena condición corporal (K = 2.57 ± 0.66), sin variaciones significativas entre periodos. Se encontraron diferencias significativas entre sexos (2006) y temporadas climáticas (2012). las hembras y los individuos capturados durante la temporada seca tuvieron los valores más altos de K. Además, para 2012, se obtuvieron datos de la composición de la dieta y helmintofauna gastrointestinal de los individuos capturados. Los datos de estas últimas dos variables se correlacionaron con la condición corporal para indagar posibles efectos; no se obtuvieron resultados significativos al respecto debido al número de muestras limitado. La composición de la dieta mostró que los peces fueron el grupo de presa mas consumido.

Se encontraron diferencias significativas en el volumen relativo del contenido estomacal en las clases III (jóvenes) y V (adultos), así como entre sexos. La clase III y los machos presentaron las dietas más variadas. Respecto a la helmintofauna gastrointestinal, se identificaron tres especies: Dujardinascaris helicina, Terranova crocodili y Contracaecum sp. tipo 2; ésta última presentó la mayor abundancia (1.94 ± 0.29) y prevalencia (38.8%). Se observaron diferencias significativas en la frecuencia de aparición de la helmintofauna gastrointestinal; Contracaecum sp. tipo 2 fue la más frecuente para la clase III y los machos. El presente trabajo, aporta información de línea base, que puede ayudar al manejo y conservación de C. acutus.

Índice

Resumen
I. Introducción
II. Objetivos
III. Materiales y métodos
Área de estudio
Muestreo y obtención de datos
Condición corporal
Composición de la dieta
Helmintos parásitos gastrointestinales
Análisis estadístico
IV. Resultados
Factor de condición de Fulton
Composición de la dieta
Helmintos parásitos gastrointestinales
Correlaciones del factor de condición de Fulton
V. Discusión
VI. Conclusiones
VII. Literatura citada
VIII. Anexos


9.
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Organochlorine pesticides in nest substratum and infertile eggs of American crocodiles (Reptilia, Crocodylidae) in a Mexican Caribbean atoll
Charruau, Pierre Alexandre Rémy Robert ; Hénaut, Yann (coaut.) ; Álvarez Legorreta, Teresa (coaut.) ;
Contenido en: Caribbean Journal of Science Vol. 47, no. 1 (2013), p. 1-12 ISSN: 0008-6452
Bibliotecas: Chetumal
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SIBE Chetumal
52596-10 (Disponible)
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Resumen en: Inglés |
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As top predators, crocodilians can bioaccumulate high concentrations of persistent organochlorine pesticides (OCPs) that may have adverse effects on their physiology and health. Recent and illegal uses of OCPs in Mexico could affect populations of the American crocodile (Crocodylus acutus), already threatened by others factors. We analyzed 16 OCP compounds using gas chromatography with electron capture detection in seven infertile eggs and in the substratum of nine nests of American crocodiles in Banco Chinchorro, an atoll off the Mexican coast of the Yucatan peninsula. Nest type, cluth size and distance from nests to nearest lagoon were also recorded, while total length of the females attending each nest was measured directly or estimated. Although Banco Chinchorro is isolated from the mainland and from know sources of contamination, OCP residues were detected in egg and nest substratum samples collected from the atoll. OCP concentrations in eggs (range: 0.002-4.000 ppb) and nest substrata (range: 0.01-1.82 ppb) are ten to thousands times lower compared to other studies. Total OCP concentration (sum of all OCPs) in nest substrata decreased with increasing distance from the shore, suggesting that eggs deposited farther from the shore were less exposed to OCP absorption from substratum. Total OCP concentrations in eggs were positively correlated with total length of females and thus with their age. We speculate that maternal transfer from laying females is likely the major source of contaminants in eggs. Future investigations are needed to identify the origin of contaminants in Banco Chinchorro.


10.
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Organochorine pesticides in nest substratum and infertile eggs of American crocodiles (Reptilia, Crocodylidae) in a Mexican Caribbean atoll
Charruau, Pierre Alexandre Rémy Robert ; Hénaut, Yann (coaut.) ; Álvarez Legorreta, Teresa (coaut.) ;
Contenido en: Caribbean Journal of Science Vol. 47, no. 1 (2013), p. 1-12 ISSN: 0008-6452
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Resumen en: Inglés |
Resumen en inglés

As top predators, crocodilians can bioaccumulate high concentrations of persistent organochlorine pesticides (OCPs) that may have adverse effects on their physiology and health. Recent and illegal uses of OCPs in Mexico could affect populations of the American crocodile (Crocodylus acutus), already threatened by other factors. We analyzed 16 OCP compounds using gas chromatography with electron capture detection in seven infertile eggs and in the substratum of nine nests of American crocodiles in Banco Chinchorro, an atoll off the Mexican coast of the Yucatan peninsula. Nest type, clutch size and distance from nests to nearest lagoon were also recorded, while total length of the females attending each nest was measured directly or estimated. Although Banco Chinchorro is isolated from the mainland and from known sources of contamination, OCP residues were detected in egg and nest substratum samples collected from the atoll. OCP concentrations in eggs (range: 0.002-4.000 ppb) and nest substrata (range: 0.01-1.82 ppb) are ten to thousands times lower compared to other studies. Total OCP concentration (sum of all OCPs) in nest substrata decreased with increasing distance from the shore, suggesting that eggs deposited farther from the shore were less exposed to OCP absorption from substratum. Total OCP concentrations in eggs were positively correlated with total length of females and thus with their age. We speculate that maternal transfer from laying females is likely the major source of contaminants in eggs. Future investigations are needed to identify the origin of contaminants in Banco Chinchorro.