Dinámica poblacional de Heteromys gaumeri Allen y Chapman, 1897, en una selva mediana del sur de Yucatán, México
This study is focused on the population dynamics, home range (HR), distribution (D), and seeds of plant species used (SPU) by Heteromys gaumeri in two grids with different levels of disturbance on the semideciduos tropical forest of Hobonil, Tzucacab, Yucatan. I worked in two grids of 2.5 ha, using...
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| Tipo de recurso: | tesis doctoral |
| Estado: | Versión publicada |
| Fecha de publicación: | 2003 |
| País: | México |
| Institución: | Universidad Autónoma Metropolitana |
| Repositorio: | Repositorio Institucional de la UAM Iztapalapa |
| Idioma: | español |
| OAI Identifier: | oai:bindani.izt.uam.mx:kp78gg82k |
| Acceso en línea: | https://doi.org/10.24275/uami.kp78gg82k |
| Access Level: | acceso abierto |
| Palabra clave: | info:eu-repo/classification/LEM/Ciencias de la vida info:eu-repo/classification/LEM/Life sciences info:eu-repo/classification/LEM/Rodents -- Yucatán (México) info:eu-repo/classification/LEM/Roedores -- Yucatán (México) info:eu-repo/classification/cti/3 |
| Sumario: | This study is focused on the population dynamics, home range (HR), distribution (D), and seeds of plant species used (SPU) by Heteromys gaumeri in two grids with different levels of disturbance on the semideciduos tropical forest of Hobonil, Tzucacab, Yucatan. I worked in two grids of 2.5 ha, using 81 Sherman traps in each one. The distances between rows and columns were of 20 m. Traps were baited with sunflowers seeds. I used the mark-and-release technique, during four nights per month, from January 2000 to December 2001. Captured animals were marked by toe clipping. Population density was estimated by two methods: the minimum number of known-alive (MNKA), probabilistic of Jolly-Seber (JS). HR was calculated by method convex polygons and maximum distance moved (MDM) To estimate SPU, I took into account seeds finned in the cheek pouch and inside the traps, these seeds were identified to the lowest taxonomic level. For D calculation, the vegetation was characterized in both grids in three categories (low disturbed, regular disturbed and disturbed). In each one the captures and recaptures were registered and they were compared. Thirty-six species of plants are able to produce fruits and form seeds, three to ten months along the year. The highest number of captures was registered in grid 1. The population density wascalculated by MNKA method and was similar to observed values. The population showed a tendency to increase trough time. Fluctuation on population density was from 1-29 ind/ha, the lowest value was in January of 2000 and the highest between June and July of 2001. Apparently population density is correlated with monthly average precipitation. Adults of both sexes prevailed the population since they were registered all months. Sub-adults showed a positive correlation with pluvial precipitation that might suggest different seasonal synchronies among ages. The highest abundance of young individuals was found in the last part of the dry season of 2001. Sex ratio was not different of 1:1; and in adults this was slightly biased to the males. Reproduction was seasonal poliestric, the reproductive females were more abundant in the dry season of 2001. Although, in most of the months, some females had signals of reproduction. Average of permanency period of the females was larger than that the males. The HRs of the males were slightly larger than that of the females. By contrast, the HR of immature individuals were smaller than those of adults. The reproductive females showed, lower HR values than non-reproductive ones. There were no differences between males and females in terms of MDM, but immatures differenced from adult organisms. Overlaping in HR was low. Facts stated above suggest the presence of territoriality in females and the existence of intraspecific tolerance. H. gaumeri removed seeds of 38 plant species, principally Bursera simaruba, Dyospiros cuneata y Sabal japa. Both sexes removed similar number of species. Females had higher frequencies removal of seeds, mainly in the dry season. The capture and recapture of individuals indicated homogeneity of distribution in the three levels of vegetation disturbance on both grids, although, the same measures were lower in the grid 2. this is probably due to the use of the vegetation by manin this grid. |
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