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58 resultados encontrados para: AUTOR: Machkour M'Rabet, Salima
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1.
Artículo
*Solicítelo con su bibliotecario/a
Accessing cryptic diversity in Neotropical rattlesnakes (Serpentes: Viperidae: Crotalus) with the description of two new species
Carbajal Márquez, Rubén Alonso (autor) ; Cedeño-Vázquez, J.R. (autor) ; Martínez Arce, Arely (autora) ; Neri Castro, Edgar (autor) ; Machkour M'Rabet, Salima (autora) ;
Contenido en: Zootaxa Vol. 4729, no. 4 (January 2020), p. 451-481 ISSN: 1175-5334
Nota: Solicítelo con su bibliotecario/a
Resumen en español

Los miembros del complejo de especies Crotalus durissus tienen una amplia distribución desde México hasta Argentina, principalmente en zonas con bosque tropical deciduo. Aunque se reconocen actualmente cuatro especies (C. culminatus, C. durissus, C. simus y C. tzabcan), los límites entre estas no son claros. Estudios genéticos previos sugieren que C. durissus y C. simus pueden ser parafiléticos y que al menos una especie críptica puede estar presente. Analizamos una secuencia de 2596 pares de bases de ADN provenientes de tres genes mitocondriales y uno nuclear, para inferir las relaciones filogenéticas en las especies de víboras de cascabel neotropicales. Por otro lado, se examinaron especímenes de museo, silvestres y ejemplares en cautiverio para analizar caracteres morfológicos. Nuestros resultados sugieren que la taxonomía actual del grupo de especies Crotalus durissus no refleja su historia evolutiva. Los resultados obtenidos muestran un fuerte apoyo para cinco linajes independientes en Crotalus simus (sensu lato) con evidencia genética y morfológica para tres taxones previamente reconocidos y dos especies nuevas, y tres linajes en C. durissus, que representan hipótesis de especies para ser probadas con evidencia adicional. También encontramos apoyo para mantener a C. totonacus en el complejo de especies Crotalus molossus. Sugerimos cambios taxonómicos conservadores para el complejo y especies relacionadas, pero se necesita más evidencia (e.g., morfología, ecología y composición bioquímica del veneno), para aclarar las relaciones entre especies.

Resumen en inglés

Members of the Crotalus durissus species complex are widely distributed from Mexico to Argentina in areas with mainly seasonally dry tropical deciduous forest. Although four species (C. culminatus, C. durissus, C. simus and C. tzabcan) are currently recognized, species limits remain to be tested. Previous genetic studies suggest that C. durissus and C. simus may be paraphyletic and that at least one cryptic species may be present. We analyzed 2596 bp of DNA sequence data from three mitochondrial and one nuclear gene to infer phylogenetic relationships in the Neotropical rattlesnakes. We also examined museum and wild specimens as well as captive animals to analyze morphological characters. Our results suggest that current taxonomy of the Crotalus durissus species complex does not reflect evolutionary history. We found strong support for five independent lineages within Crotalus simus (sensu lato), with genetic and morphological evidence for three previously recognized taxa and two new species, as well as three major lineages within C. durissus that each represent species hypothesis to be tested with additional evidence. We also found support to retain C. totonacus in the Crotalus molossus species complex. We suggest conservative taxonomic changes to the complex and related species, but more evidence is needed (e.g., morphology, ecology and venom composition) to clarify relationships among species.


2.
Artículo
Learning capacities and welfare in an Antillean manatee, Trichechus manatus manatus
Hénaut, Yann (autor) ; Lara Sánchez, Lizbeth Esmeralda (autora) ; Morales Vela, José Benjamín (autor) ; Machkour M'Rabet, Salima (autora) ;
Disponible en línea
Contenido en: Comptes Rendus Biologies Volume 343, número 1 (2020), p. 73-87 ISSN: 1768-3238
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Resumen en: Inglés |
Resumen en inglés

Studies on the cognitive abilities of manatees are limited despite their importance for the environmental enrichment and welfare of individuals in captivity and the understanding of manatee behaviour in the wild. Our study analyses how the presence of new stimuli and their association with food may have changed the behaviour of an Antillean manatee called Daniel. First, Daniel was observed in the absence of stimuli and subsequently, in step two, presented with the presence of four different geometrical shapes. During step three, we trained Daniel to eat from the square, while in step four he was presented with the four shapes without food. The behaviour and interaction of the manatee with the square increased considerably. We observed that three and twelve months after training the manatee still chose the square and displayed behaviours toward this specific shape. This study allowed us to formally demonstrate the ability of manatees to associate visual cues with food and increase activity with environmental and occupational devices. Our results open up new perspectives for behavioural studies on manatees, in particular those associated with cognition, management and welfare in captivity.


3.
Tesis - Maestría
*En proceso técnico. Solicítelo con el bibliotecario de SIBE-Campeche
Bacterias asociadas a árboles tropicales en zonas de recuperación de un disturbio antrópico / Ángel Antonio Becerra Lucio
Becerra Lucio, Ángel Antonio (0000-0002-9620-0829) ; Peña Ramírez, Yuri Jorge Jesús (Director) ; Chávez Bárcenas, Ana Tztzqui (Codirectora) ; Machkour M'Rabet, Salima (Asesora) ;
Lerma, Campeche, México : El Colegio de la Frontera Sur , 2019
Clasificación: TE/579.17097264 / B4
Bibliotecas: Campeche
Cerrar
SIBE Campeche
ECO040006967 (Disponible)
Disponibles para prestamo: 1
Nota: En proceso técnico. Solicítelo con el bibliotecario de SIBE-Campeche
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4.
Artículo
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Diversity and seasonal variation of ground and understory spiders from a tropical mountain cloud forest
Campuzano Granados, Emmanuel Franco (autor) ; Ibarra Núñez, Guillermo (autor) ; Machkour M'Rabet, Salima (autora) ; Morón Ríos, Alejandro (autor) (1960-) ; Jiménez Jiménez, María Luisa (autora) ;
Disponible en línea
Contenido en: Insect Science Volumen 27, número 4 (August 2020), p. 826-844 ISSN: 1744-7917
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Resumen en: Inglés |
Resumen en inglés

We made intensive samplings to study the seasonal response of spiders across different forest strata (ground and understory) in a tropical mountain cloud forest from Mexico. We sampled spiders from ten plots in six sampling events during the dry and rainy season, to analyze their abundance, structure (distribution of abundance among species), diversity and the response of the five dominant species at each stratum. Results demonstrated that seasonal patterns of spider communities differed among strata, revealing acomplex spatiotemporal dynamic. Abundance, structure, diversity of ground spiders, as well as the responses of four dominant species at this stratum, showed low seasonal variations. In contrast, a strong seasonal variation was observed for the understory assemblage, with lowest abundance and highest diversity in the rainy season, and different assemblage structures for each season. Seasonal patterns of each assemblage seem linked to the responses of their dominant species. We found high co-occurrence among most of the ground dominant species with similar habitat use and with multivoltine patterns, contrasting with low co-occurrence among most of the understory dominant species with similar habitat use and univoltine patterns. Our results showed that the spiders’ assemblages of tropical mountain cloud forest (opposed to what is found in temperate and boreal forests) increase their species richness with the height, and that their responses to seasonal change differ between strata. Management programs of these habitats should consider the spatial and temporal variations found here, as a better understanding of their ecological dynamics is required to support their sustainable management.


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Resumen en: Inglés |
Resumen en inglés

Many endangered freshwater turtle species are born in captivity for conservation and future reintroduction into the wild. However, in order to improve breeding programs, anassessment of the genetic diversity of the founder individuals is required to avoid genetic problems such as inbreeding, fixation of deleterious alleles, or loss of allelic diversity dueto genetic drift. In this research, we assessed the genetic diversity of the founder individuals from three Wildlife Management Units (UMA) dedicated to the reproduction of Dermatemys mawiiin southeast Mexico, and from three wild populations using ten microsatellite markers. Dermatemys mawiiis a freshwater turtle that is critically endangered due principally to fragmentation, loss, degradation, and contamination of its habitat, inaddition to hunting for human consumption. Furthermore, genetic relationships among UMAs and wild populations, as well as within each kind of group, were investigated by means of Bayesian analysis (STRUCTURE software) and discriminant analysis of principal component (DAPC). Genetic diversity in wild populations could be considered as medium, and are less than values observed for UMAs. Genetic diversity for UMAs and wild populations were discussed considering origin of individuals, translocation between UMAs, habitat quality among other factors. Genetic structure analysis highlighted an evident separation between UMAs and wild populations (Bayesian and DAPC analyses), and thehierarchical analysis of structure among UMAs reflected the origin and relationship among them, whereas geographical situation of wild populations is the best explanation for its hierarchical structure. In light of our results, some conservation and management recommendations are provided for this endangered freshwater turtle.


6.
- Artículo con arbitraje
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Genetic structure, origin, and connectivity between nesting and foraging areas of hawksbill turtles of the Yucatan Peninsula: a study for conservation and management
Labastida Estrada, Elizabeth (autora) ; Machkour M'Rabet, Salima (autora) ; Díaz Jaimes, Píndaro (autor) ; Cedeño-Vázquez, J.R. (autor) ; Hénaut, Yann (autor) ;
Contenido en: Aquatic Conservation: Marine and Freshwater Ecosystems Vol. 29, no. 2 (February 2019), p. 211–222 ISSN: 1099-0755
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Resumen en: Inglés |
Resumen en inglés

1. Anthropogenic activities have resulted in declines in many marine turtle populations. Their complex life cycle (e.g. female philopatry, hatchling migration, adult movements between breeding and foraging areas) makes it difficult to fully understand some of the biological implications of human impacts on their populations, but genetic tools can play a major role in understanding population dynamics and thus improve conservation and management strategies. 2. Using the mitochondrial DNA control region, this study examines the composition, population structure, and connectivity between rookeries and foraging aggregations, in addition to their relationship with Atlantic rookeries and foraging areas of the hawksbill turtle in the Yucatan Peninsula. 3. Haplotype composition of rookeries showed EiA22, EiA39, and EiA41 as endemic haplotypes and revealed a segregation between the Gulf of Mexico and the Yucatan and Quintana Roo rookeries, defining two management units. Foraging aggregations present 15 haplotypes, some common for Atlantic and others for Mexican rookeries. Considering the Gulf of Mexico versus the Mexican Caribbean, significant population genetic structure was revealed, inferring a differential recruitment of hawksbill turtles. 4. Rookery‐centric mixed‐stock analysis reveals a high contribution of Mexican turtles to local foraging aggregations, principally in the Gulf of Mexico. Foraging‐groundcentric mixed‐stock analysis showed that the Gulf of Mexico foraging aggregation is predominantly composed of individuals from local rookeries, whereas Mexican Caribbean foraging groups have a mixed composition with individuals from Barbados, Brazil, and Puerto Rico rookeries. The connectivity between rookeries and foraging aggregations suggests that the ocean currents and swimming behaviour influence the distribution of hawksbill turtles.

5. Our results highlighted the importance in identifying management units in nesting and foraging areas to develop monitoring and management programmes at appropriate geographic scales. In addition, understanding turtle habitat connectivity will allow for prioritized conservation actions considering particular threats, emphasizing the need for both national and international collaboration for conservation of this endangered species.


7.
Tesis - Doctorado
Patrones espaciales y estacionales de las comunidades de arañas del bosque mesófilo de montaña en el sureste mexicano / Emmanuel Franco Campuzano Granados
Campuzano Granados, Emmanuel Franco (autor) ; Ibarra Núñez, Guillermo (director) ; Jiménez Jiménez, María Luisa (asesora) ; Machkour M'Rabet, Salima (asesora) ;
Tapachula, Chiapas, México : El Colegio de la Frontera Sur , 2019
Clasificación: TE/595.44097275 / C35
Bibliotecas: Tapachula
Cerrar
SIBE Tapachula
ECO020013782 (Disponible)
Disponibles para prestamo: 1
Resumen en español

En México, el bosque mesófilo de montaña (BMM) es considerado como uno de los ecosistemas con alto riesgo de desaparecer y los esfuerzos para su conservación destacan la importancia de incrementar el conocimiento sobre taxa claves (como las arañas) que puedan servir de base para la planeación de futuras estrategias de manejo. En la presente tesis se realizaron muestreos intensivos en tres localidades dentro del área más grande y continua de BMM en México, la Sierra Madre de Chiapas (SMCh), para estudiar la diversidad y dinámica espacio-temporal de sus comunidades de arañas. En el capítulo II, se comparó la composición de especies recolectadas en la localidad de El Triunfo respecto a la de un estudio previo realizado en la misma region. Se observó un elevado recambio de especies e importantes afinidades a nivel de familias, géneros y proporción de especies no descritas. En el capítulo III, se investigó la respuesta espacio-temporal de las arañas asociadas a los estratos de suelo y sotobosque de la misma localidad. Se demostró una marcada estratificación vertical acompañada de diferentes patrones estacionales en las especies de cada estrato. En el capítulo IV, se describe una nueva especie del género Wirada, una de las especies con distribución compartida en todo el estudio y cuyo género ha sido escasamente estudiado. Se incluye una nueva diagnosis para el género, se homologan estructuras genitales respecto a la hipótesis evolutiva más reciente de la familia, se discute su estatus taxonómico y se incluye información de su biología. En conclusión, el BMM del la SMCh alberga una gran cantidad de especies no descritas y hasta ahora endémicas del hábitat. Además, muestra una dinámica espacio-temporal compleja sobre la estructura de sus comunidades, misma que es influenciada por sus especies dominantes, siendo de utilidad potencial como bioindicadores para este tipo de bosque.

Índice

Resumen
Palabras clave
Capítulo I. Introducción
Capítulo II. Spiders (Arachnida: Araneae) of the tropical mountain cloud forest from El Triunfo Biosphere Reserve, Mexico
Introduction
Materials and methods
Results
Discussion
Acknowledgments
Literature cited
Tables
Figure captions
Capítulo III. Diversity and seasonal variation of floor and understory spiders from a tropical mountain cloud forest
Abstract
Introduction
Materials and methods
Results
Discussion
Acknowledgments
References
Appendix and tables
Figure captions
Capítulo IV. A new species of the spider genus Wirada (Araneae, Theridiidae) from Mexico with taxonomic notes on the genus and a key to the species
Capítulo V. Conclusiones generales
Literatura Citada
Anexo. Lista de especies y morfoespecies recolectadas en el bosque mesófilo de montaña de la Sierra Madre de Chiapas


8.
- Artículo con arbitraje
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Resumen en: Inglés |
Resumen en inglés

Lionfish are successful invasive predators in the Caribbean region and inhabit a large range of habitats. Our study in the Caribbean has focused on the relationships between the biological characteristics of lionfish particularly their size, their activities and use of those different habitats. In this study, we observed a high number of lionfish individuals, focusing on the behavioural activities and biological traits in relation to different habitats and environmental characteristics. We monitored 793 individuals, recording their activities, biological traits, and habitat characteristics. Our results report that lionfish are not solitary, but frequently form groups for many activities. We provide evidence of differences between lionfish habitat use according to activity, and the size of individual fish. Considering the size is correlated with age, coral reefs appear to be the preferred habitat of older individuals, whereas the youngest lionfish use a diversity of habitats, ranging from mangroves to coral reefs. In addition, this study suggests that predation of lionfish is age-dependent strategy, and depends on time and the tone of the environment. Lionfish do not only use the head-down posture to catch prey but also horizontal and head-up postures. The youngest lionfish hunt mainly in dark areas and during the night while the older fish were observed hunting mostly during the day and in clear areas. These new aspects of lionfish ecology and behaviour are discussed in light of their invasive success.


9.
Tesis - Maestría
Caracterización molecular y conectividad del mangle rojo (Rhizophora mangle) en el Sur de Quintana Roo, México / Landy Rubí Chablé Iuit
Chablé Iuit, Landy Rubí ; Machkour M'Rabet, Salima (directora) ; Espinoza Ávalos, Julio (asesor) ; Hernández Arana, Héctor Abuid (asesor) ;
Chetumal, Quintana Roo, México : El Colegio de la Frontera Sur , 2018
Clasificación: TE/583.763097267 / C4
Bibliotecas: Chetumal
Cerrar
SIBE Chetumal
ECO030008726 (Disponible)
Disponibles para prestamo: 1
Resumen en español

Los manglares son ecosistemas que poseen una gran importancia tanto ecológica como económica. Debido a perturbaciones como el incremento de la población, de actividades antropogénicas a escasa distancia de los bosques de manglar, la contaminación, y el cambio climático, se ha reducido la cobertura de manglar a lo largo del mundo. Dada la importancia de este ecosistema, las amenazas a las que está sujeto y la existencia de pocos estudios genéticos en nuestro país dirigidos a la especie Rhizophora mangle, realizamos este estudio en poblaciones establecidas en cuatro grandes zonas (Bahía de Chetumal, Río Hondo, Costa del Caribe Mexicano y Laguna de Bacalar) distribuidas en el sistema hidrológico denominado Corredor Transversal Costero ubicado en el sur del estado de Quintana Roo, utilizando los Inter Secuencias Simples Repetidas (ISSR) como marcador molecular. Los resultados mostraron una clara estructura genética en la comunidad de R. mangle y la separación de los individuos que la integran en dos grupos principales: el grupo la Bahía de Chetumal y el grupo de la Costa del Caribe Mexicano, esto como reflejo de procesos históricos como el aumento en el nivel del mar. También se identificó una estructura genética a escala fina (EGEF) lo que podría estar relacionado con factores intrínsecos (e. g., dificultades en la dispersión de propágulos) y factores extrínsecos (e.g., fragmentación del hábitat). Por otro lado, la diversidad genética a nivel local y a nivel especie fue elevada lo que podría estar reflejado en la alta capacidad de adaptación de la especie a ambientes poco favorables. Finalmente, se analizaron las tipologías chaparra y de franja, llegando a la conclusión de que se trata de la misma especie y que podrían formar linajes locales como respuesta adaptativa ecológica y fisiológica al microambiente

Índice

Resumen
Capítulo 1
Introducción General
Capítulo 2 Artículo
Resumen
Palabras claves
Introducción
Material y métodos
Resultados
Discusión
Agradecimientos
Literatura citada
Capítulo 3
Conclusión General
Capítulo 4
Literatura citada
Anexos Comprobante de artículo sometido a revista arbitrada


10.
- Artículo con arbitraje
PDF PDF
Resumen en: Inglés |
Resumen en inglés

Fragmentation is the third cause of the biodiversity declination. Population genetic studies using Lepidoptera as the model species in the context of loss of habitat are scarce, particularly for tropical areas. We chose a widespread butterfly from Mexico as the model species to explore how changes of habitat characteristics (undisturbed forest, anthropogenic disturbances, and coastal areas), and climatic conditions affect genetic diversity and population structure. The Nymphalidae Eunica tatila is a common species in the Yucatan Peninsula considered to be a bio-indicator of undisturbed tropical forest, with migratory potential and a possible sex-biased dispersal. We genotyped 323 individuals collected in eight undisturbed areas, using four Inter Simple Sequence Repeats primers. Results show a high genetic diversity and no population structure. Temperature and shrub density present a positive and significant relationship with polymorphism values. Furthermore, our results show the positive effect of surrounding forest habitat on genetic diversity, confirming that E. tatila is a bio-indicator of undisturbed tropical forest. We found evidence of sex-biased dispersal. This paper represents one of the few studies on population genetics of tropical butterfly in a fragmented landscape and is, therefore, an important step in understanding the impact of habitat fragmentation on the risk of a butterflies' decline.