Estudio del desarrollo craniométrico funcional en Peromyscus melanotis y P. difficilis (Rodentia: Muridae)
Peromyscus melanotis and P. difficilis cohabit in the rainforests in the WSW of the Mexico City. The first species is monotypic, the size is small and very abundant in the study area, the second is politypic, so large average within the genera and little abundant. In addition, by means of the crania...
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| Format: | master thesis |
| Status: | Published version |
| Publication Date: | 2004 |
| Country: | México |
| Institution: | Universidad Autónoma Metropolitana |
| Repository: | Repositorio Institucional de la UAM Iztapalapa |
| Language: | Spanish |
| OAI Identifier: | oai:bindani.izt.uam.mx:hm50ts27k |
| Online Access: | https://doi.org/10.24275/uami.hm50ts27k |
| Access Level: | Open access |
| Keyword: | info:eu-repo/classification/LEM/Peromyscus info:eu-repo/classification/LEM/Rodents -- Ecology info:eu-repo/classification/LEM/Roedores -- Ecología info:eu-repo/classification/cti/3 |
| Summary: | Peromyscus melanotis and P. difficilis cohabit in the rainforests in the WSW of the Mexico City. The first species is monotypic, the size is small and very abundant in the study area, the second is politypic, so large average within the genera and little abundant. In addition, by means of the cranial design to these two species it can speak to us of the differences among them and how it is that those differences explain their coexistence to us examining the alometrics relations between the bones, subregions and functional regions of their skulls during the ontogeny with the approach of the functional morfometría. I analize the growth of the bones throughout five groups of age and review if differences in the development of the skull that are related to the sexual dimorphism and the possible alometrics differences between the skulls of both species to relate the results to some aspects of their respective life histories. Studying the functional craniometric of 708 P. melanotis and 230 P. difficilis, captured between 1995 and 1999; this methodology allows to consider the alometric effect in compound structures and, in any case, it allows to make inferences on some aspects of the sexual roll and the changes of rate during the growth. The skulls were separated by sex and group of age (according to the wearing down of the molariformes crowns) and of each one obtained a total of 32 linear measures. The measures were regrouped in regions (esplacnocráneo and neurocráneo) and functional subregions (sense of smell-gustative, visual, protector of the NCS, auditive), which considered four measures for areas and four for volumes. The analyses included geometric calculations, descriptive statistic, ANOVA of one and two ways, correlations and regressions between the variables, including the adjustment of the curves of growth obtained to the von Bertalanffy equation and Hotelling test to determine as the possible differences are being expressed. The results determinated the existence and type of alometrics correlation between variables, regions and subregions, as well as the pattern of growth for each sex and the changes in the rate of growth between the groups of age for each species. Also, the comparison between the two species was obtained. In general, both species show a sexual dimorphism that is accentuated as advances the age and in where the females exceed in size the males, reaching more quickly the measures of the adult. This pattern is clearer in P. melanotis than P. difficilis, because its growth is faster. The differences in the pattern (model) and rate of growth (slope) between these species indicate a faster metabolism linked to the minor size of P. melanotis, in both species they suggest a trade off of functions according to the sexual roll, which could be associated to a polygamy system of mating. |
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