Saltar navegación

Activa JavaScript para disfrutar de los vídeos de la Mediateca.

Return of the wilderness: Yellowstone National Park: UNESCO Culture Sector

Ajuste de pantalla

El ajuste de pantalla se aprecia al ver el vídeo en pantalla completa. Elige la presentación que más te guste:

Subido el 1 de junio de 2007 por EducaMadrid

663 visualizaciones

The mammoth geysers with their burst of steam and boiling water

Más información Transcripción

Descargar la transcripción

Return of the Wilderness, Yellowstone National Park. 00:00:00
The mammoth geysers with their bursts of steam and boiling water. 00:00:05
The jet can rise as high as 50 metres, erupting 45 tonnes of water around every hour. 00:00:10
The park is home to some 60 species of wildlife, with over 40,000 animals. 00:00:19
It's one of the few places left in North America where the natural environment remains intact. 00:00:30
Concerned about the rapid loss of wildlife, the explorer John Muir pleaded for the protection of nature and appealed for the establishment of a national park. 00:00:40
It became the first one in 1872. 00:00:51
Wildlife was protected and efforts were made to preserve the bison once on the edge of extinction to recover to a population of about 3,000 in total. 00:00:55
Yellowstone in the old days was a habitat for timber wolves. 00:01:08
But in the 1930s, they were hunted to extinction to protect domestic animals. 00:01:14
The elk population greatly increased in number in the absence of a natural enemy. 00:01:22
The grassland could not support the herds. 00:01:30
Coyotes had tripled their number and replaced the wolves. 00:01:34
As a result, small animals that coyotes fed on decreased, threatening the existence of other animals feeding on small animals. 00:01:39
31 grey wolves were introduced from Canada in 1995. 00:01:48
Eight years later, they increased in number to over 200. 00:01:54
The number of elks has since decreased and the plains are gradually regaining their original state. 00:01:59
Hunted by the grey wolves, the number of coyotes decreased and the number of small animals returned to their original figures. 00:02:05
Lightning causes forest fire almost every year in Yellowstone. 00:02:13
Firefighting is, however, kept minimal, leaving nature to recover by itself. 00:02:18
It has been found that the bushfires could actually help maintain the cycle of nature. 00:02:23
Some pine cones pop out their seed when the temperature reaches 113 degrees Celsius. 00:02:29
Burned forest ground will become a base for new sprouting trees and the forest will grow again. 00:02:35
Bushfires play an important role in rejuvenating and maintaining the forest. 00:02:42
Yellowstone teaches us how fragile and complex the balance of nature can be. 00:02:49
Valoración:
  • 1
  • 2
  • 3
  • 4
  • 5
Eres el primero. Inicia sesión para valorar el vídeo.
Idioma/s:
en
Niveles educativos:
▼ Mostrar / ocultar niveles
      • Nivel Intermedio
Autor/es:
NHK World Heritage 100 Series - UNESCO
Subido por:
EducaMadrid
Licencia:
Reconocimiento - No comercial - Sin obra derivada
Visualizaciones:
663
Fecha:
1 de junio de 2007 - 10:52
Visibilidad:
Público
Enlace Relacionado:
UNESCO
Duración:
03′
Relación de aspecto:
4:3 Hasta 2009 fue el estándar utilizado en la televisión PAL; muchas pantallas de ordenador y televisores usan este estándar, erróneamente llamado cuadrado, cuando en la realidad es rectangular o wide.
Resolución:
480x360 píxeles
Tamaño:
18.12 MBytes

Del mismo autor…

Ver más del mismo autor

EducaMadrid, Plataforma Educativa de la Comunidad de Madrid

Plataforma Educativa EducaMadrid