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15 resultados encontrados para: AUTOR: Legal, Luc
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1.
Artículo
Baronia brevicornis, Short-horned Baronia
Puttick, A. (autor) ; León Cortés, J. (autor) ; Legal, Luc (autor) ;
Disponible en línea
Contenido en: The IUCN Red List of Threatened Species Número e.T2594A119581233 (2018), p. 1-11 ISSN: 2307-8235
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2.
- 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.


3.
- Artículo con arbitraje
*Solicítelo con su bibliotecario/a
A molecular approach to understand the riddle of the invasive success of the tarantula, Brachypelma vagans, on Cozumel Island, Mexico
Machkour M'Rabet, Salima ; Vilchis Nestor, Claudia Andrea (coaut.) ; Barriga Sosa, Irene de los Ángeles (coaut.) ; Legal, Luc (coaut.) ; Hénaut, Yann (coaut.) ;
Contenido en: Biochemical Systematics and Ecology Vol. 70 (February 2017), p. 260–267 ISSN: 0305-1978
Nota: Solicítelo con su bibliotecario/a
Resumen en: Inglés |
Resumen en inglés

Invasive populations typically demonstrate genetic isolation which results in a loss of genetic diversity and a reduction in invasion success. This study focused on the genetic population of a successful invasive species of tarantula. Individuals were sampled in two mainland localities of the Yucatan Peninsula (Zoh-Laguna and Raudales), in addition to two island localities (El Cedral and Rancho Guadalupe on Cozumel Island). All populations present high genetic diversity (mean: He = 0.23, P = 99%), with significant differences between the Raudales and Rancho Guadalupe localities. The AMOVA analysis revealed a significant population structure (14.5% variation among populations), consistent with the gene differentiation coefficient (GST = 0.21), and spatial analysis of population structure. Our results suggested that the original introduced population did not suffer a loss of genetic diversity during establishment on the island, possibly a result of different biological conditions. Population structure analysis leads us to suggest that one island population is similar to the original genetic profile, whereas the genotypic profile of the other island population reflects recent introductions from the mainland. We identified a potential risk of extinction for one local mainland population, suggesting that this species may be a successful invader in a new environment but endangered in some parts of its natural area.


4.
- Artículo con arbitraje
Complex population patterns of Eunica tatila Herrich-Schäffer (Lepidoptera: Nymphalidae), with special emphasis on sexual dimorphism
Cavanzón Medrano, Laura Elena (autora) ; Pozo, Carmen (autora) ; Hénaut, Yann (autor) ; Legal, Luc (autor) ; Salas Suárez, Noemí (autora) ; Machkour M'Rabet, Salima (autora) ;
Disponible en línea
Contenido en: Neotropical Entomology Vol. 45, no. 2 (April 2016), p. 148-158 ISSN: 1678-8052
Resumen en español

The species Eunica tatila (Herrich-Schäffer) is present in the Neotropical region and comprises three subspecies. In Mexico, only one subspecies is reported: E. t. tatila (Herrich-Schäffer). The Yucatan Peninsula, in southeastern Mexico, is located in a transitional geographical position, between southern Florida, the West Indies and Central America. It is part of a transitional region, important for the dispersion of insects from southern Florida via Cuba and the Yucatan Peninsula. Considering the possibility of the overlapping and delimitation of described subspecies, we sampled different populations in the Yucatan Peninsula to possibly assign a subspecies name and evaluate the magnitude of sexual dimorphism. We collected 591 individuals (♀284, ♂307) in conserved areas. The study of male genitalia led to the identification of Eunica tatila tatilista (Kaye) as a subspecies; however, hypandrium structure and wing pattern analysis suggest a mix of E. t. tatila and E. t. tatilista characteristics. The analysis of sexual dimorphism provided evidence of more complex wing morphs for females, with 12 patterns instead of four as previously described. Our results demonstrate the complexity of characterizing E. tatila and suggest that the Yucatan Peninsula is a transitional zone for subspecies of some butterflies.


5.
Tesis - Doctorado
Estructura genética y dimorfismo sexual de Eunica tatila (Nymphalidae) en ambientes conservados de la Península de Yucatán / Laura Elena Cavanzón Medrano
Cavanzón Medrano, Laura Elena ; Machkour M'Rabet, Salima (directora) ; Pozo, Carmen (asesora) ; Hénaut, Yann (asesor) ; Legal, Luc (asesor) ;
Chetumal, Quintana Roo, México : El Colegio de la Frontera Sur , 2016
Clasificación: TE/595.789097265 / C3
Bibliotecas: Chetumal
Cerrar
SIBE Chetumal
ECO030008509 (Disponible)
Disponibles para prestamo: 1
Resumen en español

La pérdida de diversidad biologica por efecto de la fragmentación es uno de los principales temas para la conservación. Entre las medidas comúnmente utilizada para evaluar el efecto de la fragmentación se encuentra el uso de bioindicadores. La sensibilidad de los lepidópteros ante cambios ambientales ha hecho que los lepidópteros, en particular las mariposas diurnas, sean considerados como especies bioindicadoras. En la Península de Yucatán, Eunica tatila ha sido identificada como indicadora de ambientes conservados. El propósito de este trabajo consistió en estudiar la estructura genética, y la morfología de poblaciones de E. tatila en un paisaje fragmentado. Las diversas barreras naturales y antropogénicas que existen en la Peninsula de Yucatan podrían afectar a las poblaciones de E. tatila disminuyendo el flujo genético, y afectando la diversidad genética. Se recolectaron un total de 591 individuos de los cuales 351 fueron utilizados para análisis moleculares. Los resultados muestran una baja diversidad genética y una estructura en metapoblación para la Península de Yucatán.Se demostró el efecto positivo de las zonas conservadas sobre la diversidad genética de E. tatila, y el efecto negativo de la presencia antropogénica (actividad humana) cercana a las poblaciones de E. tatila. Ademas, los datos moleculares permitieron mostrar que los machos presentan una mayor dispersión que las hembras.

En cuanto a la morfología, se presentan por primera vez una alta variación fenotípica para las hembras con 12 patrones alares, y solamente cuatro para los machos. Además, las hembras presentan mayor medidas alares, mientras que los machos presentan mayor medidas torácicas lo que se relaciona con su mayor capacidad de dispersión. La gran capacidad de dispersión de E. tatila, con sus migraciones esporádicas, permite que el flujo genético no se vea afectado. Sin embargo, las actividades humanas afectan la diversidad genética de esta especie indicadora de ambiente conservado. Este trabajo representa uno de los pocos trabajos de diversidad genética y estructura poblacional de mariposas tropicales en paisajes fragmentados. Es fundamental aumentar los trabajos para mejorar el entendimiento del impacto de la fragmentación del hábitat en la Península de Yucatán considerada como una “hotspot” de la biodiversidad

Índice

Índice
Resumen
Capítulo 1. Introducción general
Capítulo 2. Effect of natural barriers and anthropogenic disturbances on genetic structure and diversity of Eunica tatila in the Yucatan Peninsula, Mexico
Capítulo 3. Complex population patterns of Eunica tatila Herrich-Schäffer (Lepidoptera:Nymphalidae) in the Yucatan Peninsula, Mexico, with special emphasis on sexual dimorphism
Capítulo 4. Conclusiones generales
Capítulo 5. Literatura citada


6.
- Artículo con arbitraje
Resumen en: Inglés | Frances |
Resumen en inglés

Baronia brevicornis Salvin (Lepidoptera: Papilionidae) is one of the most enigmatic butterflies in the world and possibly represents the most ancient lineage among the superfamily Papilionoidea. Its geographic distribution is remote from that of all its potential close relatives and many of its biological and ecological characteristics are unique among the suborder Rhopalocera. One of its particularities is that the occurrence plots of this species seem to be independent, each representing individual populations, despite the fact that the host plant: Acacia cochliacantha Humboldt and Bonpland ex Willdenow (Fabaceae), is one of the most common Mexican Fabaceae species. Our results show that no B. brevicornis populations occur if the host plant does not cover at least two-thirds of the locality. Even in the most favourable zones, the landscape occupancy of the butterfly does not exceed 2.5% of the available habitat even when its host plant covers 50% of the area. The average density of adults was 840 individuals/ha in favourable habitats, frequently on areas of around 3 ha, below of 1400 m. Using the BIOMOD2 package and the largest available set of abiotic conditions for Mexico implemented in the WorldClim database, we propose a revised potential distribution and discuss the results of our model with field occurrence data. Evolutionary and conservation issues are discussed in the light of our results.

Resumen en frances

Baronia brevicornis Salvin (Lepidoptera: Papilionidae) est l’un des papillons les plus énigmatiques au monde et semble représenter la lignée évolutive la plus ancienne des Papilionoidea. Sa répartition géographique diffère de façon marquée de celle des espèces les plus proches. De plus, de nombreuses caractéristiques biologiques et écologiques sont uniques parmi les Rhopalocera. Une particularité notable est que chaque zone de présence de cette espèce semble représenter une population individualisée et ce malgré que la plante hôte, Acacia cochliacantha Humboldt and Bonpland ex Willdenow (Fabaceae), soit l’une des plus communes, et largement répandue au Mexique. Même dans les zones les plus favorables, ce papillon n’occupe pas plus de 2,5% de l’habitat disponible alors que sa plante hôte peut recouvrir 50% de la même zone. Dans chaque population, la densité moyenne des adultes est de 840 individus/ha. La surface moyenne des zones de présence est de 3 ha elles se trouvent toujours en dessous de 1400 m. Une modélisation de la distribution théorique de cette espèce a été réalisée à l’aide du paquet BIOMOD2 et de la plus complète base de données dans WorldClim disponible pour le Mexique. La simulation est comparée aux données de présence de terrain. À la lumière des résultats obtenus, des hypothèses concernant l’évolution de l’espèce et des mesures de conservation sont proposées.


7.
- Artículo con arbitraje
Population structure and genetic diversity of the only extant Baroninae swallowtail butterfly, Baronia brevicornis, revealed by ISSR markers
Machkour M'Rabet, Salima ; Leberger, Roxanne (coaut.) ; León Cortés, Jorge Leonel (coaut.) ; Gers, Charles (coaut.) ; Legal, Luc (coaut.) ;
Contenido en: Journal of Insect Conservation Vol. 18, no. 3 (June 2014), p. 385-396 ISSN: 1366-638X
Resumen en: Inglés |
Resumen en inglés

Due to its relict nature, the unique Baroninae swallowtail, Baronia brevicornis, is considered a “living fossil”. It is also one of the most enigmatic butterfly species with contentious origins and peculiar ecological characteristics. The aim of this study is to evaluate the genetic diversity and population structure of this endemic species of butterfly in Mexico. We sampled populations in two areas within its restricted geographical range in central Mexico and the isolated subspecies population in the state of Chiapas. Three ISSR primers produced 66 loci, indicating a high genetic diversity (P = 100 %, He = 0.22) and variation range in these populations (62 % < P < 85 %, 0.18 < He < 0.25). The Chiapas population presented the lowest values. The observed high values can be explained by the population dynamic of this species characterized by a very high density of individuals over very limited areas. Variation between populations appears to reflect both the age of colonization and locality perturbation level. Two methods of genetic structure analysis (Self-Organizing Map and Structure analysis) match to define three clusters. Natural and anthropogenic barriers may explain the separation between two clusters (cluster 1 and 2) of central Mexico but an unexpected result revealed that the Chiapas population is not genetically distinguishable from the central Mexico populations (cluster 3) leading us to hypothesize a possible “recent” separation or anthropogenic introduction. Habitat and host plant specificity probably limits the exchange of individuals between populations thus increasing fragmentation and leading to a complex genetic structure. We should put in place population monitoring schemes at different spatial scales, combining field occurrences and genetic tools, in order to reduce extinction susceptibility and keep track of recolonization events for this enigmatic species.


8.
- Artículo con arbitraje
*Solicítelo con su bibliotecario/a
Prey selection in a nocturnal web-building spider, Eriophora edax (Araneae Araneidae)
Meraza, L. C. ; Hénaut, Yann (coaut.) ; Legal, Luc (coaut.) ;
Contenido en: Ethology Ecology and Evolution Vol. 24, no. 1 (2012), p. 1-13 ISSN: 0394-9370
Nota: Solicítelo con su bibliotecario/a
Resumen en: Inglés |
Resumen en inglés

A field study was conducted to compare hourly captures by nocturnal adult female orb-web spiders (Eriophora edax) and the insect fauna collected at the same time, using a UV light trap. Predation of the spiders is related to the activity patterns of Lepidoptera, since this order of insects was the dominant prey type of E. edax. Also, E. edax showed a positive selection (Ivlev's index of electivity) for Lepidoptera, which means that the spiders showed a selective over-predation of this prey taxon from the pool of insect prey available in the habitat. Based on our results, we suggest that this spider's behaviour might represent an adaptation to the first step in the evolution of a spider-moth specialisation.


9.
Artículo
When landscape modification is advantageous for protected species. The case of a synanthropic tarantula, Brachypelma vagans
Machkour M'Rabet, Salima ; Hénaut, Yann (coaut.) ; Calmé, Sophie (coaut.) ; Legal, Luc (coaut.) ;
Contenido en: Journal of Insect Conservation Vol. 16, no. 4 (2012), p. 479-48 ISSN: 1572-9753
Resumen en: Inglés |
Resumen en inglés

Landscape fragmentation usually has a considerable effect on the genetic and demographic viability of most species because it reduces population size and increases isolation among populations. This situation provokes loss of genetic diversity and increased inbreeding that can lead to population or species extinctions. Some studies also show that landscape fragmentation may have no effect on or even positive consequences for species genetic diversity. The protected tarantula, Brachypelma vagans, exhibits a particular situation in the Mexican Caribbean, which has experienced high lowland and coastal fragmentation because of recent increases in agricultural, urban and touristic development. This modified landscape structure creates favorable conditions for establishment of B. vagans populations in rural settlements. Populations of this tarantula have high densities of individuals, principally females and juveniles, and gene dispersion is assumed by the rare males. Within this context, we studied the influence of natural and anthropogenic fragmentation on the genetic diversity of six B. vagans populations (five continental, one insular), together with their spatial organization. Our approach used seven inter simple sequence repeat markers, which are highly polymorphic markers. The 76 loci selected revealed high genetic variability for continental populations and a low, but not critical situation, for the insular population.

We detected a good level of gene exchange among continental populations, and an evident and recent isolation of the island population. This species exhibits a metapopulation structure in the lowlands with numerous local populations where mature females exhibit high birth site fidelity. We conclude that this protected species does not exhibit characteristics to warrant its current conservation status, and we propose complete revision of the ecological and genetic situation for B. vagans in particular, and for all species within the genus Brachypelma in general.


10.
Artículo
Apparent influences of host-plant distribution on the structure and the genetic variability of local populations of the Purple Clay (Diarsia brunnea)
Luque, Carine ; Legal, Luc (coaut.) ; Machkour M'Rabet, Salima (coaut.) ; Winterton, Peter (coaut.) ; Gers, Charles (coaut.) ; Wink, Michael (coaut.) ;
Contenido en: Biochemical Systematics and Ecology Vol. 37, no. 1 (February 2009), p. 6-15
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
38299-10 (Disponible)
Disponibles para prestamo: 1
Resumen en: Inglés |
Resumen en inglés

Diarsia brunnea (Lepidoptera, Heterocera, Noctuidae, Denis and Schiffermuller, 1775) is an abundant oligophagous moth occurring in the French Pyrenees. No or little influence of the forest type was found on population densities. In order to study the genetic structure of two separate moth populations in a natural forest and in a plantation, genomic fingerprinting with ISSR markers (Inter Simple Sequence Repeats) was used. The goal was to search for potential spatial structuring which could be influenced by differences in forest type. No detectable genetic differences were observed between the populations of the two forest sites. But, although it was not possible to separate on the simple basis of the sampling site, a non-spatial structuring of three sub-populations became apparent. Three of the host plants known for this moth are present in the sampled locations. Three genetically distinct sub-populations were discovered which correlated with the abundance of the three host plants in the two forest plots.