Video Experimental Relacionado
Updated: May 20, 2026
14:58
Behavioral Tracking and Neuromast Imaging of Mexican Cavefish
Published on: April 6, 2019
Las madrigueras bilaterales y el comportamiento de pastoreo en >585 millones de años atrás
Ernesto Pecoits1, Kurt O Konhauser, Natalie R Aubet
1Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta T6G 2E3, Canada. epecoits@ualberta.ca
Science (New York, N.Y.)
|June 30, 2012
Resumen
Las madrigueras bilaterales más antiguas conocidas, que datan de al menos 585 millones de años, se han descubierto en Uruguay. Estos restos fósiles proporcionan la primera evidencia directa de la vida y el comportamiento de los primeros eumetazoos durante las glaciaciones del Neoproterozoico.
Área de la Ciencia:
- Paleontología Paleontología.
- Biología evolutiva Biología evolutiva.
- Geocronología Geocronología.
Sus antecedentes:
- Los relojes moleculares y los biomarcadores sugieren una emergencia bilateral temprana de Ediacaran.
- Anteriormente no se habían reportado fósiles definitivos o restos fósiles de este período.
Objetivo del estudio:
- Para informar sobre el descubrimiento de las madrigueras bilaterales más antiguas.
- Proporcionar evidencia paleontológica para la evolución bilateral temprana.
- Para vincular los orígenes bilaterales con los cambios ambientales del Neoproterozoico.
Principales métodos:
- Descubrimiento de restos fósiles en sedimentos glaciomarinos de aguas poco profundas.
- La datación con uranio y plomo de los zircones en diques de granito transversal para limitar la edad.
- Análisis de la morfología de la madriguera y las características sedimentarias.
Principales resultados:
- Las madrigueras bilaterales más antiguas descubiertas en la Formación Tacuarí, Uruguay.
- Datado a por lo menos 585 millones de años de edad.
- Evidencia de pastoreo infaunal, relleno activo, movimiento vertical y sinuoso de los primeros eumetazoos.
Conclusiones:
- Estos hallazgos unen datos paleontológicos y moleculares sobre la evolución bilateral.
- El descubrimiento proporciona la primera evidencia directa de la vida y el comportamiento bilaterales tempranos.
- Enlaza los orígenes bilaterales con los cambios ambientales durante las glaciaciones del Neoproterozoico.
Videos de Conceptos Relacionados
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.
02:22The Colonization of Land
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...
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...
00:48Optimal Foraging
How animals obtain and eat their food is called foraging behavior. Foraging can include searching for plants and hunting for prey and depends on the species and environment.
00:54What is Behavior?
Behaviors are actions that an organism engages in—they can be related to finding food, reproducing, defending against threats, and many other possible actions. Behaviors include activities related to the environment around the animal—such as migration—as well as social interactions within a species or population. Many behaviors involve motor output—that is, muscle movements—while others involve less visible actions, such as learning.
01:50What is Monogastric Digestion?
The human body contains a monogastric digestive system. In a monogastric digestive system, the stomach only contains one chamber in which it digests food. Several other animal species also have monogastric digestive systems, including pigs, horses, dogs, and birds. This chapter, however, focuses on the human digestive system.