Video Experimental Relacionado
Updated: Jul 11, 2026
08:02
Dissection and Flat-mounting of the Threespine Stickleback Branchial Skeleton
Published on: May 7, 2016
Evolución correlacionada y cambio dietético en el fósil del stickleback
Mark A Purnell1, Michael A Bell, David C Baines
1Department of Geology, University of Leicester, Leicester LE1 7RH, UK. mark.purnell@leicester.ac.uk
Science (New York, N.Y.)
|September 29, 2007
Resumen
Los fósiles de estos peces muestran que los cambios en la dieta impulsaron una rápida evolución a lo largo de miles de años. El análisis del micro desgaste dental proporciona evidencia directa que vincula los hábitos alimenticios con el cambio microevolucionario.
Área de la Ciencia:
- Paleontología Paleontología.
- Biología evolutiva Biología evolutiva.
- Ecología Trófica Ecología Trófica
Sus antecedentes:
- La ecología trófica es crucial para la adaptación y la evolución.
- La evidencia fósil directa que vincula la alimentación con la microevolución en escalas de tiempo largas es escasa.
Objetivo del estudio:
- Proporcionar pruebas fósiles directas de que la alimentación controla la microevolución.
- Investigar el papel de los cambios de nicho trófico en la conducción del cambio evolutivo.
Principales métodos:
- Análisis cuantitativo del micro desgaste dental en el fósil del stickleback.
- Examen de los cambios evolutivos en escalas de tiempo extendidas utilizando el registro fósil.
Principales resultados:
- El rápido cambio evolutivo en el stickleback del Mioceno se correlacionó con cambios en la dieta.
- El análisis del micro desgaste dental reveló cambios en el nicho trófico y la explotación de los recursos.
- La evidencia apoya la alimentación como un impulsor del cambio direccional de la microevolución durante miles de años.
Conclusiones:
- El análisis del micro desgaste dental ofrece poderosas ideas sobre las radiaciones adaptativas acuáticas.
- La ecología de alimentación influye directamente en las trayectorias microevolutivas a lo largo del tiempo geológico.
- Los datos fósiles confirman el vínculo entre la dieta y la adaptación evolutiva.
Videos de Conceptos Relacionados
02:55The Evidence for Evolution
Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.The collection of fossils within sedimentary rocks give a record of common ancestry and often depicts the history of evolution.
01:54Convergent Evolution
Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.The structures that arise from convergent evolution are called analogous structures. They are similar in function even if they are dissimilar in structure. Further, structures can be analogous while also...
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.
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...
01:06Fixed Action Patterns
A fixed action pattern (FAP) is a specific, hard-wired sequence of behaviors that occurs in response to an external stimulus, called a sign stimulus. The behavior is “fixed” because it is essentially unchangeable—proceeding similarly across individuals of a species every time it occurs.
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...