Browsing by Autor "Gabriela Villalpando"

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Dieta de oso andino en la región alta de Apolobamba y Madidi en el norte de La Paz, Bolivia
(2009) Boris Ríos-Uzeda; Gabriela Villalpando; Oswaldo Palabral; Óscar García Álvarez
Enhanced erythropoietin expression in the brainstem of newborn rats at high altitude
(Elsevier BV, 2011) Tommy Seaborn; Marcelino Gonzales; Gabriela Villalpando; Beat Grenacher; Ruddy Soria; Jorge Soliz
First record of Rhagomys (Mammalia: Sigmodontinae) in Bolivia
(Smithsonian Institution, 2006) Gabriela Villalpando; Julieta Vargas; Jorge Salazar‐Bravo
A recent monograph on the biological diversity of Bolivia concludes that the country is megadiverse (Ibisch and Merida, 2003); this statement is especially true for mammals. Despite being a landlocked country and representing only 6% of the geographic area of South America, Bolivia harbors the 4th mostdiverse mammalian fauna of the continent (Ceballos and Simmonetti, 2002). However, the country remains poorly explored, as reports of new taxa for science or the country have recently been published (Pacheco et al., 2004; Rios-Uzeda et al., 2004; Solmsdorff et al., 2004; Emmons and Patton, 2005). These new records and species, coupled with further advances in the taxonomy and systematics on Neotropical mammals have rendered sections of Anderson’s book Mammals of Bolivia (Anderson, 1997) obsolete in less than a decade after its publication. Accordingly, in this paper, we report a new genus and species of mammal for the fauna of Bolivia. Measurements of the animal followed Luna and Patterson (2003) except for greatest length of skull (GLS), taken to be represented by the occipito-nasal length, and CML (Condylomolar length), which was not measured because it was not defined either by Luna and Patterson (2003) or any of the references cited therein (Myers et al., 1990; Voss, 1991 or Musser et al., 1998). Rhagomys longilingua Luna and Patterson, 2003
Life-long consequences of postnatal normoxia exposure in rats raised at high altitude
(American Physiological Society, 2011) Delphine Lumbroso; A. Lemoine; Marcelino Gonzales; Gabriela Villalpando; Tommy Seaborn; Vincent Joseph
We tested the hypothesis that exposure of high-altitude (HA) rats to a period of postnatal normoxia has long-term consequences on the ventilatory and hematological acclimatization in adults. Male and female HA rats (3,600 m, Po 2 ≃ 100 Torr; La Paz, Bolivia) were exposed to normal room air [HA control (HACont)] or enriched oxygen (32% O 2 ; Po 2 ≃ 160 Torr) from 1 day before to 15 days after birth [HA postnatal normoxia (HApNorm)]. Hematocrit and hemoglobin values were assessed at 2, 12, and 32 wk of age. Cardiac and lung morphology were assessed at 12 wk by measuring right ventricular hypertrophy (pulmonary hypertension index) and lung air space-to-tissue ratio (indicative of alveolarization). Respiratory parameters under baseline conditions and in response to 32% O 2 for 10 min (relieving the ambient hypoxic stimulus) were measured by whole body plethysmography at 12 wk. Finally, we performed a survival analysis up to 600 days of age. Compared with HACont, HApNorm rats had reduced hematocrit and hemoglobin levels at all ages (both sexes); reduced right ventricular hypertrophy (both sexes); lower air space-to-tissue ratio in the lungs (males only); reduced CO 2 production rate, but higher oxygen uptake (males only); and similar respiratory frequency, tidal volume, and minute ventilation. When breathing 32% O 2 , HApNorm male rats had a stronger decrease of minute ventilation than HACont. HApNorm rats had a marked tendency toward longer survival throughout the study. We conclude that exposure to ambient hypoxia during postnatal development in HA rats has deleterious consequences on acclimatization to hypoxia as adults.