Video Experimental Relacionado
Updated: Jul 10, 2026
12:47
A Technique to Screen American Beech for Resistance to the Beech Scale Insect (Cryptococcus fagisuga Lind.)
Published on: May 27, 2014
El pájaro carpintero de pico de marfil (Campephilus principalis) persiste en la parte continental de América del
John W Fitzpatrick1, Martjan Lammertink, M David Luneau
1Cornell Laboratory of Ornithology, Cornell University, 159 Sapsucker Woods Road, Ithaca, NY 14850, USA. jwf7@cornell.edu
Science (New York, N.Y.)
|April 30, 2005
Resumen
El pájaro carpintero de pico de marfil (Campephilus principalis), que una vez se pensó que estaba extinto, ha sido redescubierto en Arkansas. La evidencia incluye avistamientos visuales, análisis de video y firmas acústicas, lo que sugiere una población sobreviviente.
Área de la Ciencia:
- Ornitología Ornitología.
- Conservación de la vida silvestre Conservación de la vida silvestre
- Estudios de la biodiversidad Estudios de la biodiversidad.
Sus antecedentes:
- El pájaro carpintero de pico de marfil (Campephilus principalis) es una especie de preocupación por la conservación, con su extinción ampliamente sospechada.
- Los registros históricos indican que la especie habitaba el sureste de los Estados Unidos, pero los avistamientos han sido excepcionalmente raros en las últimas décadas.
Objetivo del estudio:
- Para confirmar la existencia continuada del pájaro carpintero de pico de marfil.
- Para documentar la evidencia de la especie en una región geográfica específica.
Principales métodos:
- Realizar encuestas visuales y registrar observaciones en la región de Big Woods en el este de Arkansas.
- Analizando imágenes de video capturadas en abril de 2004 para obtener evidencia de la especie.
- Detectar y analizar las firmas acústicas, específicamente los tambores de visualización, asociados con los pájaros carpinteros Campephilus.
Principales resultados:
- Se han confirmado encuentros visuales con al menos un pájaro carpintero de pico de marfil macho durante 2004 y 2005.
- El análisis de la evidencia de video corroboró la presencia del ave.
- El monitoreo acústico detectó patrones de sonido consistentes con los tambores de exhibición de pájaros carpinteros con picos de marfil.
Conclusiones:
- El redescubrimiento del pájaro carpintero de pico de marfil en los Bosques Grandes proporciona evidencia crítica contra su extinción.
- Si bien la población parece estar poco distribuida, el vasto hábitat potencial sugiere que puede persistir una población reproductora viable, aunque pequeña.
- Se justifican más estudios extensos para determinar la extensión total y el estado de esta población redescubierta.
Videos de Conceptos Relacionados
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...
01:46Types of Selection
Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
01:39Keystone Species
Measures of species biodiversity, such as richness (i.e., the number of species present) and evenness (i.e., their relative abundance), describe an ecological community’s structure. Many factors affect community structure, including abiotic factors (e.g., sunlight and nutrients), disturbances (e.g., fire or flood), species interactions (e.g., predation or competition), and chance events (e.g., foreign species invasion). Certain species—such as keystone species—also play a pivotal role in the...
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.
01:15Teeth
The formation of teeth, also known as odontogenesis, is a complex process that begins in utero, around the sixth week of embryonic development. There are three stages to this process: the bud stage, the cap stage, and the bell stage.
In the bud stage, the tooth germ (an aggregation of cells) starts to form in the developing jawbone. During the cap stage, the tooth germ differentiates into enamel organ, dental papilla, and dental sac, which will later develop into the tooth's enamel, dentin and...
In the bud stage, the tooth germ (an aggregation of cells) starts to form in the developing jawbone. During the cap stage, the tooth germ differentiates into enamel organ, dental papilla, and dental sac, which will later develop into the tooth's enamel, dentin and...
01:21Tooth Anatomy
The human tooth enables us to eat a variety of foods, speak clearly, and even aid in shaping our faces. Teeth are composed of various elements that work together. Here's a detailed look at the anatomy of a human tooth.
The Crown, Neck, and Root
The visible part of the tooth is referred to as the crown. It's covered by enamel, the hardest substance in the human body. The crown is uniquely shaped for each type of tooth, allowing for different functions such as cutting, tearing, or grinding food.
The Crown, Neck, and Root
The visible part of the tooth is referred to as the crown. It's covered by enamel, the hardest substance in the human body. The crown is uniquely shaped for each type of tooth, allowing for different functions such as cutting, tearing, or grinding food.