Browsing by Autor "Omar N. Urquizo"

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Age-related anomalies of electrocardiograms in patients from areas with differential Seroprevalence of Chagas disease in Southern Bolivia
(Elsevier BV, 2021) Jhean-Carla Echalar; David Véliz; Omar N. Urquizo; Hermann M. Niemeyer; Carlos F. Pinto
Higher seroprevalence in rural population was attributable to a higher probability to encounter the vector in rural areas. Increased exposure to infection and to development of the disease symptoms together with increased lethality of the disease as patients age explains the age-related Chagasic electrocardiographic anomalies. Since rural and urban populations showed different reactions under Chagas disease and the rural population was mainly of guaraní stock, the genetic and environmental determinants of the results should be further explored.
Inexpensive Methods for Detecting and Reproducing Substrate-Borne Vibrations: Advantages and Limitations
(Springer Nature, 2022) Rachele Nieri; Sabrina Michael; Carlos F. Pinto; Omar N. Urquizo; Heidi M. Appel; Reginald B. Cocroft
Pollen composition and physicochemical properties of honey produced by three stingless bees species from a mesotropical subhumid region in Bolivia
(Springer Science+Business Media, 2024) M. Adler; Gina Zambrana-Camacho; Luis Flores‐Prado; Omar N. Urquizo; Kathy Collao-Alvarado; Carlos F. Pinto
Pollen Preference Patterns by Tetragonisca angustula (Apidae: Meliponini) in a Boliviano–Tucumano Forest
(Springer Nature, 2022) Omar N. Urquizo; Fabricio Cardozo-Alarcón; M. Adler; Reinaldo Lozano; Selmy Calcina-Mamani; Kathy Collao-Alvarado; Hermann M. Niemeyer; Carlos F. Pinto
Pollination systems and nectar rewards in four Andean species of <i>Salvia</i> (Lamiaceae)
(Canadian Science Publishing, 2023) Alexandria Saravia-Nava; Santiago Benitez‐Vieyra; Omar N. Urquizo; Hermann M. Niemeyer; Carlos F. Pinto
Adaptation to the most effective pollinator is often conceived as the primary explanation of widespread convergence in flower phenotypes. However, specialization does not exclude the presence of other floral visitors, which may contribute to plant reproduction. Here we combined observations about pollinators’ visitation rates and effectiveness with nectar secretion dynamics and sugar composition in four Andean Salvia species from Bolivia. The study revealed a wider diversity than expected both in pollination systems and in nectar strategies. While Salvia haenkei Benth. and Salvia stachydifolia Benth. were almost exclusively pollinated by either hummingbirds or bees, respectively, mixed pollination was found in Salvia orbignaei Benth., a species previously described as hummingbird-pollinated. Salvia personata Epling. was exclusively pollinated by syrphid flies. Differences in nectar volume and sugar concentration were found between insect-pollinated species and mixed- or hummingbird-pollinated species. However, the four Salvia species displayed different strategies regarding nectar sugar composition, with sucrose-rich nectar in Salvia orbignaei, glucose-rich nectar in Salvia haenkei and Salvia stachydifolia, and glucose-rich nectar lacking fructose in Salvia personata, suggesting an adaptation to syrphid fly pollination. Our results provide a clearer picture of floral trait evolution in Salvia and highlight the contribution of some pollinators different from those expected according to the floral syndromes.
Reproductive and brood-rearing strategies in Alchisme grossa (Hemiptera: Membracidae): genetic analyses of kinship relationships
(Springer Nature, 2020) Omar N. Urquizo; David Véliz; Daniel Torrico-Bazoberry; Caren Vega‐Retter; Luis Flores‐Prado; Hermann M. Niemeyer; Carlos F. Pinto