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Speciation Rates01:07

Speciation 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.
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Ecological succession is influenced by the processes of facilitation, inhibition, and toleration. Facilitation occurs when early successional species create more favorable ecological conditions for subsequent species, such as enhanced nutrient, water, or light availability. In contrast, inhibition happens when early successional species create unfavorable ecological conditions for potential successive species, such as limiting resource availability. In some cases, later successional species...
The Colonization of Land02:22

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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...
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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.
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Pathogen colonization of host tissues is a critical step in the development of infectious diseases. Various pathogenic microorganisms, including bacteria, fungi, viruses, and protozoa, have evolved complex strategies to attach to, invade, and persist within host environments. These mechanisms enable pathogens to establish infections, evade immune responses, and resist antimicrobial treatments.Attachment to Host CellsIn bacteria, colonization typically begins with adherence to host epithelial...

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Updated: Jul 19, 2026

Resurrection of Dormant Daphnia magna: Protocol and Applications
07:37

Resurrection of Dormant Daphnia magna: Protocol and Applications

Published on: January 19, 2018

Colonización tardía de la Isla de Pascua.

Terry L Hunt1, Carl P Lipo

  • 1Department of Anthropology, University of Hawai'i Manoa, 2424 Maile Way, Honolulu, HI 96822, USA. thunt@hawaii.edu

Science (New York, N.Y.)
|March 11, 2006
PubMed
Resumen

Isla de Pascua Isla de Pascua es una isla de Pascua.

Área de la Ciencia:

  • Arqueología Arqueología.
  • Ciencias ambientales Ciencias ambientales.
  • Estudios de las Islas del Pacífico Estudios de las Islas del Pacífico.

Sus antecedentes:

  • La Isla de Pascua (Rapa Nui) sirve como un estudio de caso crítico para comprender la degradación ambiental inducida por el hombre.
  • Establecer una cronología precisa es esencial para analizar la historia cultural, ecológica y demográfica de la isla.

Objetivo del estudio:

  • Para establecer una cronología confiable para el asentamiento humano de la Isla de Pascua.
  • Comprender el momento de los impactos ecológicos y los desarrollos culturales en relación con el asentamiento.

Principales métodos:

  • La datación por radiocarbono de las primeras capas estratigráficas en Anakena, Isla de Pascua.
  • Análisis y síntesis de conjuntos de datos de fecha de radiocarbono publicados anteriormente.

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Principales resultados:

  • La evidencia sugiere una colonización tardía de la Isla de Pascua, alrededor del año 1200 d.C.
  • La degradación ambiental significativa y la construcción monumental comenzaron poco después del asentamiento inicial de la isla.

Conclusiones:

  • La llegada tardía de los humanos a la Isla de Pascua condujo a transformaciones ecológicas y culturales rápidas y sustanciales.
  • Esta cronología revisada reformula nuestra comprensión de la historia ambiental de la isla y el desarrollo social.