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  • 1
    Online Resource
    Online Resource
    Instituto de Ecologia, A.C. ; 2018
    In:  Acta Botanica Mexicana , No. 126 ( 2018-12-13)
    In: Acta Botanica Mexicana, Instituto de Ecologia, A.C., , No. 126 ( 2018-12-13)
    Abstract: Background and Aims: The genus Bursera (~100 species) has its center of diversification and endemism in Mexico. Interspecific hybridization is a frequent phenomenon in Bursera in areas where related species coexist. Hybridization on the one hand can reinforce reproductive barriers, increase genetic variation, generate novel ecotypes and new lineages, and on the other hand, can lead to maladaptation. However, the ecological and evolutionary consequences of natural hybridization critically depend on hybrid fitness. In this study, within a putative hybrid population in the tropical dry forest of the Bajío region in Mexico and as a proxy of hybrid fitness, we investigated pollen viability among Bursera cuneata, B. bipinnata, and their putative hybrid.Methods: We used two techniques: a pollen staining test with tetrazolium chloride 1% and an in vitro germination test to observe the formation of pollen tubes. Viability percentages were calculated for each group; statistical tests were conducted with general linear models. Key results: Results demonstrated that the putative hybrid is not sterile and exhibited higher germination rates relative to the parental species. Conclusions: Our results imply that gene flow between the parental species and the putative hybrid is likely to occur. Future genetic studies should confirm the genetic identity and ploidy levels of hybrids and evaluate whether genetic introgression has occurred. Our study demonstrates that Bursera hybrids can be fertile and contributes towards understanding the role of hybridization and reproductive isolation in Mexican Bursera species.
    Type of Medium: Online Resource
    ISSN: 2448-7589 , 0187-7151
    Language: Unknown
    Publisher: Instituto de Ecologia, A.C.
    Publication Date: 2018
    detail.hit.zdb_id: 2267815-3
    SSG: 12
    SSG: 7,36
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  • 2
    Online Resource
    Online Resource
    Journal of the Academy, Asociacion de Universidades del Peru ; 2023
    In:  Journal of the Academy , No. 8 ( 2023-1-6), p. 94-118
    In: Journal of the Academy, Journal of the Academy, Asociacion de Universidades del Peru, , No. 8 ( 2023-1-6), p. 94-118
    Abstract: Esta investigación abordó la preferencia de los bachilleres en Colombia en virtud de las decisiones que toman dentro de un conjunto de oportunidades y, que rodean la elección del programa de formación y de la institución de educación superior, aspecto que surge por la tensión entre calidad docente y calidad educativa. El objetivo de este trabajo es comprender la configuración de la preferencia académica de los bachilleres para su ingreso a la educación superior, con énfasis en carreras de educación, tomando como referente elementos de la Teoría de la Elección Racional, a partir del análisis estadístico descriptivo de clústeres, extraídos de la base de datos del ICFES (Instituto Colombiano para la Evaluación de la Educación), evidenciando que la configuración de la preferencia confluyen tres elementos: a) deseos y creencias de quien decide; b) restricciones; y c) opciones disponibles o conjunto de oportunidad que permite la acción. Luego se contrastan las similitudes y diferencias de los elementos circundantes a la elección de este tipo de programas, concluyendo que hay semejanzas en sus deseos y oportunidades, no obstante, los filtros y las restricciones marcan diferencias entre los bachilleres que eligen carreras de educación y los que no.
    Type of Medium: Online Resource
    ISSN: 2707-0301 , 2707-0301
    URL: Issue
    Language: Spanish
    Publisher: Journal of the Academy, Asociacion de Universidades del Peru
    Publication Date: 2023
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  • 3
    In: Applications in Plant Sciences, Wiley, Vol. 3, No. 7 ( 2015-07)
    Abstract: We developed novel microsatellite markers for the perennial plant Pulsatilla vulgaris (Ranunculaceae) to investigate the effects of fragmentation on gene flow in this imperiled species. Methods and Results: We identified microsatellites and developed primers based on 454 shotgun sequences. We identified 14 markers that were polymorphic and produced clean bands. Of these, eight could be analyzed as diploids. Genotyping of 97 individuals across two populations revealed these markers to be highly polymorphic with seven to 17 alleles per locus and observed heterozygosity from 0.41 to 0.83. Conclusions: The markers are highly informative and will be used to test if the reintroduction of shepherding in southern Germany improves genetic connectivity among fragmented populations of P. vulgaris . The combination of diploid and tetraploid markers presented here will be useful in resolving the polyploidization history of this and related species.
    Type of Medium: Online Resource
    ISSN: 2168-0450 , 2168-0450
    Language: English
    Publisher: Wiley
    Publication Date: 2015
    detail.hit.zdb_id: 2699923-7
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  • 4
    In: Journal of Mammalogy, Oxford University Press (OUP), Vol. 101, No. 4 ( 2020-09-09), p. 1117-1132
    Abstract: The Peromyscus maniculatus species complex is one of the most widespread group of small mammals in North America. However, the taxonomy and phylogenetic relationships among its constituent taxa remain unclear. As part of a revision of Peromyscus specimens from the highlands of the Trans-Mexican Volcanic Belt in central Mexico, we identified five individuals collected in 1968 that differed externally from other Peromyscus specimens, although morphologically similar to P. labecula and P. melanotis, both latter in the P. maniculatus species complex. Based on cranial measurements and mitochondrial DNA sequences, we aimed to more accurately determine the phylogenetic relationships and the taxonomic status of these individuals. Molecular phylogenetic analyses showed that the specimens formed a monophyletic clade sister to the P. maniculatus species complex. Pairwise genetic distances between those specimens and other species within the P. maniculatus species complex were greater than 7.91%. In addition, morphological analyses clearly distinguished the test specimens from P. melanotis and P. labecula. Based on the results of our molecular and morphological analyses, we conclude that these specimens represent an undescribed species of the P. maniculatus species complex, which we describe herein.
    Type of Medium: Online Resource
    ISSN: 0022-2372 , 1545-1542
    RVK:
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2020
    detail.hit.zdb_id: 2066602-0
    SSG: 12
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  • 5
    Online Resource
    Online Resource
    Springer Science and Business Media LLC ; 2023
    In:  Tree Genetics & Genomes Vol. 19, No. 1 ( 2023-02)
    In: Tree Genetics & Genomes, Springer Science and Business Media LLC, Vol. 19, No. 1 ( 2023-02)
    Type of Medium: Online Resource
    ISSN: 1614-2942 , 1614-2950
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2023
    detail.hit.zdb_id: 2180926-4
    SSG: 12
    SSG: 23
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  • 6
    Online Resource
    Online Resource
    University of Guanajuato ; 2019
    In:  Acta Universitaria Vol. 29 ( 2019-04-10), p. 1-23
    In: Acta Universitaria, University of Guanajuato, Vol. 29 ( 2019-04-10), p. 1-23
    Abstract: The rich biodiversity of Mexico is threatened due to habitat fragmentation and climate change. Landscape genetics provides an excellent framework that integrates genetic, geographic, and ecological landscape data to inform conservation strategies. To discuss the value of landscape genetics for the study of the Mexican biota, a literature review of landscape genetics studies in Mexico was conducted to highlight trends of taxonomic groups, habitats, and research objectives. A total of 20 studies were identified: 65% in plants and 35% in animals. A large proportion of studies focused on temperate ecosystems and tropical forests, whereas marine and urban environments were lacking. Detection of linear barriers and landscape features on gene flow were the most popular objectives, while two objectives were exclusive to plants: spatial adaptive variation and estimates of contemporary gene flow with parentage analyses to evaluate effects of habitat fragmentation. Potential areas of research for landscape genetics studies in Mexico and recommendations are discussed. 
    Type of Medium: Online Resource
    ISSN: 2007-9621 , 0188-6266
    Language: Unknown
    Publisher: University of Guanajuato
    Publication Date: 2019
    detail.hit.zdb_id: 2223646-6
    SSG: 7,36
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  • 7
    In: Mammal Research, Springer Science and Business Media LLC, Vol. 68, No. 3 ( 2023-07), p. 397-408
    Type of Medium: Online Resource
    ISSN: 2199-2401 , 2199-241X
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2023
    detail.hit.zdb_id: 2808353-2
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  • 8
    In: Evolutionary Applications, Wiley, Vol. 9, No. 10 ( 2016-12), p. 1271-1284
    Abstract: Small and isolated populations often exhibit low genetic diversity due to drift and inbreeding, but may simultaneously harbour adaptive variation. We investigate spatial distributions of immunogenetic variation in American badger subspecies ( Taxidea taxus ), as a proxy for evaluating their evolutionary potential across the northern extent of the species’ range. We compared genetic structure of 20 microsatellites and the major histocompatibility complex ( MHC DRB exon 2) to evaluate whether small, isolated populations show low adaptive polymorphism relative to large and well‐connected populations. Our results suggest that gene flow plays a prominent role in shaping MHC polymorphism across large spatial scales, while the interplay between gene flow and selection was stronger towards the northern peripheries. The similarity of MHC alleles within subspecies relative to their neutral genetic differentiation suggests that adaptive divergence among subspecies can be maintained despite ongoing gene flow along subspecies boundaries. Neutral genetic diversity was low in small relative to large populations, but MHC diversity within individuals was high in small populations. Despite reduced neutral genetic variation, small and isolated populations harbour functional variation that likely contribute to the species evolutionary potential at the northern range. Our findings suggest that conservation approaches should focus on managing adaptive variation across the species range rather than protecting subspecies per se.
    Type of Medium: Online Resource
    ISSN: 1752-4571 , 1752-4571
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2016
    detail.hit.zdb_id: 2405496-3
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  • 9
    In: Conservation Genetics Resources, Springer Science and Business Media LLC, Vol. 12, No. 4 ( 2020-12), p. 601-610
    Type of Medium: Online Resource
    ISSN: 1877-7252 , 1877-7260
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2020
    detail.hit.zdb_id: 2508018-0
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  • 10
    Online Resource
    Online Resource
    Instituto de Ecologia, A.C. ; 2008
    In:  ACTA ZOOLÓGICA MEXICANA (N.S.) Vol. 24, No. 3 ( 2008-12-10)
    In: ACTA ZOOLÓGICA MEXICANA (N.S.), Instituto de Ecologia, A.C., Vol. 24, No. 3 ( 2008-12-10)
    Abstract: En este trabajo se analizaron las diferencias en la talla corporal de tres poblaciones de la liebre de Tehuantepec, Lepus flavigularis, en el Istmo de Tehuantepec, Oaxaca, México. Los análisis de regresiónlinear entre la longitud total del cuerpo y el peso corporal fueron estadísticamente significativos para las hembras y machos de la población de Santa María del Mar, y para los machos de la población de Montecillo Santa Cruz, pero no para las hembras. Asimismo, la relación no fue significativa para los machos de Aguachil. El análisis de varianza indicó que las liebres de Santa María del Mar tienen mayor longitud corporal que las liebres de Aguachil y Montecillo Santa Cruz. Los resultados encontrados coincidieron con los datos genéticos que separan a las liebres de Santa María del Mar en un grupo distinto del resto de las poblaciones. Es posible que las diferencias en la longitud corporal estén relacionadas con las características ecológicas del hábitat que predominan en cada una de las poblaciones de liebres.
    Type of Medium: Online Resource
    ISSN: 2448-8445 , 0065-1737
    Language: Unknown
    Publisher: Instituto de Ecologia, A.C.
    Publication Date: 2008
    detail.hit.zdb_id: 2274730-8
    SSG: 12
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