scholarly journals DISTRIBUCIÓN POTENCIAL DEL PUMA (Puma concolor) EN EL ESTADO DE AGUASCALIENTES, MÉXICO

2014 ◽  
Vol 4 (2) ◽  
pp. 45
Author(s):  
J. Antonio De la Torre ◽  
Leonora Torres-Knoop
Keyword(s):  
Puma Concolor ◽  
Pine Forests ◽  
Niche Modelling ◽  
Mountain Areas ◽  
Viable Population ◽  
Habitat Corridors ◽  
Rugged Topography ◽  
Vegetation Patches ◽  
Maxent Algorithm ◽  
Modelling Approach

RESUMENLa distribución actual del puma (<i>Puma concolor</i>) en México en la mayor parte del país es desconocida. Por medio un modelo de nicho ecológico utilizando el algoritmo Maxent identificamos la distribución potencial del puma en el estado de Aguascalientes. Utilizamos 41 registros de campo de la especie, 19 variables climáticas y 3 variables topográficas para hacer la modelación. De acuerdo al modelo, el puma se distribuye en la mayor parte del oeste del estado, la cual corresponde con zonas serranas. Esta región está dominada por bosques de encino y encino-pino, así como de una topografía accidentada. Consideramos que la protección de los parches y los corredores de vegetación que unen a las localidades predichas en el modelo de distribución potencial y que se extienden hacia los estados de Zacatecas y Jalisco, son fundamentales para la conservación de una población viable de pumas en esta región.Palabras clave: Aguascalientes, distribución, Jalisco, Maxent, México, <i>Puma concolor</i>, Zacatecas.ABSTRACTThe current distribution of the puma (<i>Puma concolor</i>) in Mexico in the most of the country is unknown. Through an ecological niche modelling approach using the Maxent algorithm we identified the potential distribution of the puma in the Aguascalientes State. To perform de model we used 41 field records of the species, 19 climatic variables and 3 topographic variables. According to the model, the puma occurs in most of west side of the Aguascalientes, which corresponds to mountain areas. This region is dominated by oak and oak-pine forests with a rugged topography. To conserve a viable population of puma in this region, we consider that it is necessary to protect the vegetation patches and the habitat corridors to link those predicted areas by the model, which are extended to Zacatecas and Jalisco States.Keywords: Aguascalientes, distribution, Jalisco, Maxent, Mexico, <i>Puma concolor</i>, Zacatecas.

scholarly journals Leishmaniasis in Eurasia and Africa: geographical distribution of vector species and pathogens

2019 ◽  
Vol 6 (5) ◽  
pp. 190334 ◽  
Author(s):  
Sarah Cunze ◽  
Judith Kochmann ◽  
Lisa K. Koch ◽  
Korbinian J. Q. Hasselmann ◽  
Sven Klimpel
Keyword(s):  
Vector Competence ◽  
Risk Assessments ◽  
Neglected Diseases ◽  
Vector Species ◽  
Niche Modelling ◽  
Northern Latitudes ◽  
Suitability Maps ◽  
Vector Borne ◽  
Pathogen Vector ◽  
Modelling Approach

Leishmaniasis is a vector-borne disease with a broad global occurrence and an increasing number of recorded cases; however, it is still one of the world's most neglected diseases. We here provide climatic suitability maps generated by means of an ecological niche modelling approach for 32 Phlebotomus vector species with proven or suspected vector competence for five Leishmania pathogens occurring in Eurasia and Africa. A GIS-based spatial overlay analysis was then used to compare the distributional patterns of vectors and pathogens to help evaluate the vector species–pathogen relationship currently found in the literature. Based on this single factor of vector incrimination, that is, co-occurrence of both vector and pathogen, most of the pathogens occurred with at least one of the associated vector species. In the case of L. donovani , only a not yet confirmed vector species, P. rodhaini, could explain the occurrence of the pathogen in regions of Africa. Phlebotomus alexandri and P. longiductus on the other hand, proven vector species of L. donovani, do not seem to qualify as vectors for the pathogen. Their distribution is restricted to northern latitudes and does not match the pathogen's distribution, which lies in southern latitudes. Other more locally confined mismatches were discussed for each pathogen species. The comparative geographical GIS-overlay of vector species and pathogens functions as a first indication that testing and re-evaluation of some pathogen–vector relationships might be worthwhile to improve risk assessments of leishmaniasis.

scholarly journals Spatial Heterogeneity of Habitat Suitability for Rift Valley Fever Occurrence in Tanzania: An Ecological Niche Modelling Approach

2016 ◽  
Vol 10 (9) ◽  
pp. e0005002 ◽  
Author(s):  
Calvin Sindato ◽  
Kim B. Stevens ◽  
Esron D. Karimuribo ◽  
Leonard E. G. Mboera ◽  
Janusz T. Paweska ◽  
...  
Keyword(s):  
Spatial Heterogeneity ◽  
Habitat Suitability ◽  
Rift Valley ◽  
Ecological Niche ◽  
Rift Valley Fever ◽  
Ecological Niche Modelling ◽  
Niche Modelling ◽  
Valley Fever ◽  
Modelling Approach

scholarly journals Floral Scent Evolution in the Genus Jaborosa (Solanaceae): Influence of Ecological and Environmental Factors

Plants ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 1512
Author(s):  
Marcela Moré ◽  
Florencia Soteras ◽  
Ana C. Ibañez ◽  
Stefan Dötterl ◽  
Andrea A. Cocucci ◽  
...  
Keyword(s):  
Floral Scent ◽  
Interspecific Variation ◽  
Niche Modelling ◽  
Large White ◽  
Pollinator Abundance ◽  
Geographic Differences ◽  
Pollination Mode ◽  
Joint Consideration ◽  
Specific Odor ◽  
Modelling Approach

Floral scent is a key communication channel between plants and pollinators. However, the contributions of environment and phylogeny to floral scent composition remain poorly understood. In this study, we characterized interspecific variation of floral scent composition in the genus Jaborosa Juss. (Solanaceae) and, using an ecological niche modelling approach (ENM), we assessed the environmental variables that exerted the strongest influence on floral scent variation, taking into account pollination mode and phylogenetic relationships. Our results indicate that two major evolutionary themes have emerged: (i) a ‘warm Lowland Subtropical nectar-rewarding clade’ with large white hawkmoth pollinated flowers that emit fragrances dominated by oxygenated aromatic or sesquiterpenoid volatiles, and (ii) a ‘cool-temperate brood-deceptive clade’ of largely fly-pollinated species found at high altitudes (Andes) or latitudes (Patagonian Steppe) that emit foul odors including cresol, indole and sulfuric volatiles. The joint consideration of floral scent profiles, pollination mode, and geoclimatic context helped us to disentangle the factors that shaped floral scent evolution across “pollinator climates” (geographic differences in pollinator abundance or preference). Our findings suggest that the ability of plants in the genus Jaborosa to colonize newly formed habitats during Andean orogeny was associated with striking transitions in flower scent composition that trigger specific odor-driven behaviors in nocturnal hawkmoths and saprophilous fly pollinators.

Preparation of a Viable Population of Indium-111- Labelled Human Blood Platelets

1979 ◽  
Vol 42 (05) ◽  
pp. 1473-1482 ◽  
Author(s):  
A Dup Heyns ◽  
P N Badenhorst ◽  
H Pieters ◽  
M G Lötter ◽  
P C Minnaar ◽  
...  
Keyword(s):  
Platelet Rich Plasma ◽  
Blood Platelets ◽  
Kinetic Studies ◽  
Physiological Saline ◽  
Human Platelets ◽  
Autologous Plasma ◽  
Platelet Suspension ◽  
Viable Population ◽  
Indium 111

SummaryFactors influencing labelling of human platelets with 111Indium-8-hydroxyquinoline ([111In]-oxine) in a physiological saline medium were investigated. The efficiency of labelling is influenced by time of incubation, concentration of oxine, and pH of the incubating medium. It was found that a viable platelet population could be labelled under the following conditions: (1) centrifugation of platelet rich plasma in polystyrene conical tubes at 800 g for 15 min; (2) resuspension of the platelet pellet in saline, pH 5.5; (3) incubating for 30 min at 22°C with [111In]-oxine at a concentration of 6.25 mg oxine/litre platelet suspension; (4) washing once with platelet poor autologous plasma (PPP); and (5) finally resuspending the platelets in PPP. The labelled platelets aggregated normally with collagen and ADP. Electron microscopy, done immediately after labelling, showed internal organelle reorganization characteristic of activated platelets. These ultrastructural features were reversible on incubation in PPP at 37°C for 30 min. The 111In is not released from aggregated platelets and the label does not elute from incubated platelets for at least five hr. We conclude that human platelets thus labelled are suitable for in vivo kinetic studies.

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