Video Experimental Relacionado
Updated: Jul 12, 2026
06:49
Reduced Itraconazole Concentration and Durations Are Successful in Treating Batrachochytrium dendrobatidis Infection in Amphibians
Published on: March 14, 2014
El pantano Lancefield y la extinción de la megafauna australiana
Science (New York, N.Y.)
|June 2, 1978
Resumen
La antigua megafauna australiana, incluidos 10.000 animales gigantes extintos, coexistieron con los humanos durante al menos 7.000 años. La evidencia sugiere que su extinción no fue causada por la rápida matanza excesiva humana.
Área de la Ciencia:
- Paleontología Paleontología.
- Arqueología Arqueología.
- Ciencia Cuaternaria La ciencia cuaternaria es la ciencia cuaternaria.
Sus antecedentes:
- El lecho óseo pantanoso de Lancefield en Australia contiene aproximadamente 10.000 animales gigantes extintos.
- La datación indica que estos animales vivieron hace 26.000 años.
Objetivo del estudio:
- Para investigar la causa de la extinción de la megafauna australiana.
- Para determinar la línea de tiempo de la presencia humana en relación con la extinción de la megafauna.
Principales métodos:
- Excavación del lecho óseo del pantano de Lancefield.
- La datación de los restos fósiles.
- Análisis de artefactos asociados.
Principales resultados:
- El lecho óseo contiene un estimado de 10.000 animales gigantes extintos.
- Los artefactos asociados sugieren la presencia humana en el área.
- La causa directa de la muerte de los animales no es actualmente explicable.
- La megafauna vivió junto a los humanos durante al menos 7.000 años en el sureste de Australia.
Conclusiones:
- La coexistencia a largo plazo de la megafauna y los seres humanos desafía las hipótesis de una rápida matanza excesiva.
- La extinción de la megafauna del Pleistoceno en Australia probablemente no fue un evento repentino causado por los humanos.
Videos de Conceptos Relacionados
02:56The Fossil Record
The fossil record documents only a small fraction of all organisms that have ever inhabited Earth. Fossilization is a rare process, and most organisms never become fossils. Moreover, the fossil record only exhibits fossils that have been discovered. Nevertheless, sedimentary rock fossils of long-lived, abundant, hard-bodied organisms dominate the fossil record. These fossils offer valuable information, such as an organism's physical form, behavior, and age. Studying the fossil record helps...
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.
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...
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...
01:07Speciation Rates
Speciation can proceed at markedly different rates, and evolutionary biologists commonly describe these differences through the models of gradualism and punctuated equilibrium. Both patterns explain how new species arise, but they differ in the tempo and continuity of evolutionary change. In both cases, evolutionary change arises from heritable variation within populations, with natural selection often shaping traits that improve survival and reproduction under specific environmental conditions.