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Copyright of Revista Electrónica de Psicología Iztacala is the property of Facultad de Estudios Superiores Iztacala and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Medicina (Buenos Aires) is the property of Medicina (Buenos Aires) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Se evaluó la abundancia y recambio de las especies ícticas que habitan en la laguna de Celestún en función de los ciclos de luz y oscuridad y del tipo de hábitats. Para ello se realizaron 6 muestreos bimestrales en una red de 4 estaciones; 2 localizadas en la boca y 2 en la zona interna de la laguna. Los sitios de cada zona comprenden un fondo con vegetación acuática y otro sin ésta (VAS, FSV). En cada sitio se registraron parámetros hidrológicos para determinar su relación con la estructura de la comunidad. Los peces se recolectaron con un chinchorro (15 × 1.5 m, 2.5cm luz de malla) en un periodo diurno (10:00-3:00), crepuscular (18:00-21:00) y nocturno (02:00-05:00). Para su análisis se utilizaron diferentes estadísticos multivariados no parámetricos (NPMANOVA, NMDS, betadisper). Se encontraron diferencias en composición de especies de peces entre hábitats con VAS y FSV (F=2.6108, p=0.0114). La tasa de recambio de especies es baja entre hábitats y entre ciclos de luz-oscuridad. Los ensamblajes de peces entre hábitats son más dinámicos que nictimeralmente, debido a que las praderas de vegetación sumergida soportan un mayor número de especies por su función en la alimentación y/o como protección.The abundance and turnover of fish species inhabiting Celestún lagoon were evaluated according to day-night cycles, as well as habitat type. Bimonthly sampling was done at 4 sites of the lagoon, 2 at the mouth and 2 at the inner zone. The sites for each zone include bottoms with and without submerged aquatic vegetation (VAS, FSV). At each site hydrologic parameters were registered to determine their relationship with fish community structure. Fish specimens were collected using a beach seine (15 ×1.5 m, 2.5cm mesh) at day (10:00-13:00), twilight (18:00-21:00) and night (02:00-05:00). Multivariate non-parametric (NPMANOVA, NMDS, betadisper) statistics were used for the analysis. Difference in fish species were found between habitats with VAS and FSV (F=2.6108, p=0.0114). The betadisper test indicated that species rate of replacement is low between habitats and during day-night cycles. Fish assemblages between habitats are more dynamic than day-night cycles, due to seagrass meadows that host great numbers of species providing protection and food availability.

Changes in height throughout the day after standing are poorly understood, even in morphological sciences. This study evaluated height variations throughout the day in a sample of young Colombian population. Using a stratified random sampling with proportional allocation, diurnal changes in height was evaluated in 55 subjects. Four measurements of size were taken over a day, using a conventional measurer for it. Statistical analysis of the results was performed by testing agreement (ICC). The average age of the subjects tested was 19.5±1.86 years, of which 22 (40%) were male. The average height and weight were 167.1±8.59 cm and 65.8±14.5 Kg respectively. The average loss of height after the day was 9.4±3.12 mm loss in women was 9.72±3.35 mm and 8.95±2.76 mm in men but this difference was not significant (p=0.22). Statistically significant association between weight >78 Kg and height loss in the day >1cm (p=0.18) was not identified. In the range of 06:00 to 10:00 hours came up with the greatest reduction in size, 60%; while from 10:00 to 14:00 hours the decrease was 10% and 30% of 14:00-18:00 hours. Height loss observed in this study was just below that reported in the literature. The knowledge of the changes in height throughout the day should be taken in consideration when diagnosing growth pathologies. [ABSTRACT FROM AUTHOR]