Efectos del cambio climático en la morfología craneal de Abrothrix hirta (Cricetidae, Sigmodontinae).
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Date
2025
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Publisher
Universidad de Concepción
Abstract
Las respuestas de los roedores al cambio climático son diversas. Es esencial disponer de fuentes de información a largo plazo para estudiar este proceso y predecir con precisión su impacto biológico, incluidos los cambios morfológicos a lo largo del tiempo. Desgraciadamente, hay muy pocas fuentes de este tipo en las colecciones científicas del hemisferio sur. Proponemos utilizar muestras históricas para estudiar los cambios morfológicos a lo largo del tiempo y su relación con las variables climáticas, utilizando una colección de especímenes de Abrothrix hirta de un periodo temporal disyunto (1970s-2000s) de la Región del Ñuble, Chile. Se tomaron medidas craneales y dentales de los especímenes y se obtuvieron datos climáticos de las localidades de recolección. Se realizaron análisis estadísticos para evaluar las variaciones morfológicas y su asociación con factores climáticos. Esta tesis sugiere que existe cambio en la forma del cráneo de Abrothrix hirta en la región del Ñuble en el marco temporal estudiado. Adicionalmente, estos cambios en la forma se relacionan con los cambios observados en las variables climáticas locales en el mismo marco temporal.
Rodent responses to climate change are diverse. It is essential to have long-term information sources to study this process and accurately predict its biological impact, including morphological changes over time. Unfortunately, there are very few such sources in the scientific collections of the Southern Hemisphere. We propose using historical samples to study morphological changes over time and their relationship with climate variables, using a collection of specimens of Abrothrix hirta from Región del Ñuble, Chile. Cranial and dental measurements were taken from the specimens, and climatic data for the collection localities were obtained. Statistical analyses were conducted to assess morphological variations and their association with climatic factors, including linear and geometrical morphometry and Generalized Linear Models (GLM). This thesis establishes that there is a change in the shape of the skull of Abrothrix hirta in the Ñuble region in the time frame studied. Additionally, these changes in the shape are related to the changes observed in the local climatic variables in the same time frame.
Rodent responses to climate change are diverse. It is essential to have long-term information sources to study this process and accurately predict its biological impact, including morphological changes over time. Unfortunately, there are very few such sources in the scientific collections of the Southern Hemisphere. We propose using historical samples to study morphological changes over time and their relationship with climate variables, using a collection of specimens of Abrothrix hirta from Región del Ñuble, Chile. Cranial and dental measurements were taken from the specimens, and climatic data for the collection localities were obtained. Statistical analyses were conducted to assess morphological variations and their association with climatic factors, including linear and geometrical morphometry and Generalized Linear Models (GLM). This thesis establishes that there is a change in the shape of the skull of Abrothrix hirta in the Ñuble region in the time frame studied. Additionally, these changes in the shape are related to the changes observed in the local climatic variables in the same time frame.
Description
Tesis presentada para optar al título de Biólogo/a.
Keywords
Morfología (Biología), Cráneo, Roedores, Cambios climáticos