Video Experimental Relacionado
Updated: Mar 2, 2026
06:10
Using Generative Art to Convey Past and Future Climate Transitions
Published on: March 31, 2023
1.5K
Nuevas edades para la ocupación humana y el cambio climático en el lago Mungo, Australia
James M Bowler1, Harvey Johnston, Jon M Olley
1School of Earth Sciences, University of Melbourne, Melbourne, Victoria 3010, Australia. j.bowler@earthsci.unimelb.edu.au
Nature
|February 21, 2003
Resumen
Una nueva datación revela que los restos humanos más antiguos de Australia en el lago Mungo tienen 40.000 años. Este hallazgo proporciona información crucial sobre la adaptación humana temprana al cambio climático en Australia.
Área de la Ciencia:
- Arqueología Arqueología.
- Paleoclimatología Paleoclimatología
- Evolución del ser humano Evolución del ser humano
Sus antecedentes:
- El lago Mungo contiene los restos humanos más antiguos de Australia, incluidos el entierro de ocre de Mungo III y la cremación de Mungo I.
- La datación previa de estos hallazgos significativos era inconsistente, variando entre hace 20-62 mil años (kyr).
- Los datos cronológicos y paleoambientales limitados limitaban previamente la comprensión de estas primeras ocupaciones humanas.
Objetivo del estudio:
- Para establecer una cronología precisa de los entierros humanos en el lago Mungo.
- Para reconstruir las condiciones paleoambientales durante la ocupación humana temprana del sitio.
- Comprender el momento de la llegada humana en relación con el cambio climático y la extinción de la megafauna en Australia.
Principales métodos:
- Utilizó una nueva serie de 25 mediciones de datación óptica.
- Analizó evidencia estratigráfica para interpretar las condiciones pasadas del lago y los cambios ambientales.
- Integró una nueva datación con el conocimiento existente de la prehistoria australiana y las extinciones de la megafauna.
Principales resultados:
- Se estableció que tanto la cremación de Mungo I como el entierro de Mungo III ocurrieron hace 40 ± 2 kyr.
- Determinada presencia humana en el lago Mungo que se remonta a hace 50-46 millones de años.
- Se documentan fluctuaciones en los niveles de los lagos y un aumento en la deposición de polvo desde hace 50 a 40 millones de años, seguido de una aridez sostenida desde hace 40 a 30 millones de años.
Conclusiones:
- La nueva cronología refina la edad de los primeros entierros humanos en el lago Mungo.
- La llegada humana coincidió con cambios ambientales significativos, incluido el deterioro del clima y la extinción de la megafauna.
- El Homo sapiens demostró la capacidad de adaptación a las difíciles condiciones ambientales en el continente australiano.
Más Videos Relacionados
09:06Removal of Exogenous Materials from the Outer Portion of Frozen Cores to Investigate the Ancient Biological Communities Harbored Inside
Published on: July 3, 2016
8.7K
14:38Establishment of Microbial Eukaryotic Enrichment Cultures from a Chemically Stratified Antarctic Lake and Assessment of Carbon Fixation Potential
Published on: April 20, 2012
11.9K
Videos de Conceptos Relacionados
00:53Migration
9.0K
Migration is long-range, seasonal movement from one region or habitat to another. This common strategy, carried out by many different organisms around the world, is an adaptive response that typically corresponds to changes in an organism’s environment, like resource availability or climate. Migrations can involve huge groups of thousands of animals as well as single individuals traveling alone and can range from thousands of kilometers to just a few hundred meters.
9.0K
01:50Global Climate Change
29.2K
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.
29.2K
02:22The Colonization of Land
38.2K
Changes in the environment of the early Earth drove the evolution of organisms. As prokaryotic organisms in the oceans began to photosynthesize, they produced oxygen. Eventually, oxygen saturated the oceans and entered the air, resulting in an increase in atmospheric oxygen concentration, known as the oxygen revolution approximately 2.3 billion years ago. Therefore, organisms that could use oxygen for cellular respiration had an advantage. More than 1.5 years ago, eukaryotic cells and...
38.2K
02:35What is Evolutionary History?
44.0K
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.
44.0K
01:50Threats to Biodiversity
27.5K
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...
27.5K
02:56The Fossil Record
27.7K
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...
27.7K