Video Experimental Relacionado
Updated: Jun 12, 2026
07:40
A Noninvasive Hair Sampling Technique to Obtain High Quality DNA from Elusive Small Mammals
Published on: March 13, 2011
Pérdida de la diversidad de pequeños mamíferos en respuesta al cambio climático del Pleistoceno tardío
Jessica L Blois1, Jenny L McGuire, Elizabeth A Hadly
1Department of Biology, Stanford University, Stanford, California 94305, USA. blois@wisc.edu
Nature
|May 25, 2010
Resumen
Las pequeñas comunidades de mamíferos experimentaron una pérdida significativa de diversidad durante la transición Pleistoceno-Holoceno, a pesar de que no hubo extinciones. Esta reestructuración impacta la biodiversidad moderna y predice cambios futuros debido al calentamiento global.
Área de la Ciencia:
- Paleontología Paleontología.
- Ecología Ecología Ecología.
- Ciencias del clima Ciencias del clima Ciencias del clima Ciencias del clima
Sus antecedentes:
- El cambio climático del pasado ha moldeado significativamente las comunidades ecológicas.
- El final de la época del Pleistoceno (hace unos 11.700 años) vio grandes cambios ambientales en América del Norte, incluido el calentamiento climático y la llegada de humanos.
- Si bien las extinciones de la megafauna están bien estudiadas, el impacto en las pequeñas comunidades de mamíferos durante esta transición se entiende menos.
Videos de Conceptos Relacionados
01:50Threats to Biodiversity
There have been five major extinction events throughout geological history, resulting in the elimination of biodiversity, followed by a rebound of species that adapted to the new conditions. In the current geological epoch, the Holocene, there is a sixth extinction event in progress. This mass extinction has been attributed to human activities and is thus provisionally called the Anthropocene. In 2019 the human population reached 7.7 billion people and is projected to comprise 10 billion by...
01:50Global Climate Change
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
02:04Conservation of Small Populations
Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less likely to...
02:31Habitat Fragmentation
Habitat fragmentation describes the division of a more extensive, continuous habitat into smaller, discontinuous areas. Human activities such as land conversion, as well as slower geological processes leading to changes in the physical environment, are the two leading causes of habitat fragmentation. The fragmentation process typically follows the same steps: perforation, dissection, fragmentation, shrinkage, and attrition.
02:07Conservation of Declining Populations
Conservation of declining population focuses on ways of detecting, diagnosing, and halting a population decline. The approach uses methods to prevent populations from going extinct.
02:35What is Evolutionary History?
Scientists record evolutionary history by analyzing fossil, morphological, and genetic data. The fossil record documents the history of life on Earth and provides evidence for evolution. However, both fossil and living organisms offer evidence that outlines Earth’s evolutionary history.Phylogenetic trees illustrate the evolutionary relationships among these organisms. Scientists infer organisms’ common ancestry by evaluating shared morphological and genetic characteristics. Together, the fossil...