Va al Ejemplar actual
PNUMAPNUD
Edición Impresa
MEDIOAMBIENTE Y DESARROLLO
 
Inter Press Service
Buscar Archivo de ejemplares Buzón
  Al DIA
Home Page
Ejemplar actual
Reportajes
  Exclusivo para la red
  Análisis
  Grandes Plumas
  Acentos
  Entrevista y P&R
  Ecobreves
  ¿Lo sabías?
  Tú puedes
  Libros
  Galería
Ediciones especiales
Gente de Tierramérica
  ¿Quiénes somos?
  Servicios
  FAQ
Geojuvenil
Espacio de debate hecho por jóvenes y para Jóvenes
Geojuvenil
 

Eduterra
Proyecto educativo

Eduterra

 
Cambio Climático
Proyecto de soporte a negociación ambiental

Cambio Climático

  Inter Press Service
Principal fuente de información
sobre temas globales de seguridad humana
  PNUD
Programa de las Naciones Unidas para el Desarrollo
  PNUMA
Programa de las Naciones Unidas para el Medio Ambiente
 
Did you know?

1 What is an ecosystem?

An ecosystem consists of a community of living organisms and their local physical environment. The living and non-living elements of an ecosystem are connected through flows of energy and the cycling of chemical elements. No part of the biosphere that is smaller than an ecosystem can sustain life.


2 Is there a difference between a population and a community?


Yes. A population consists of interbreeding members of one species living in a specific area, more or less isolated from other members of their species. A community consists of a collection of populations of different species interacting within a specific area, functioning more or less as a unit with certain identifiable characteristics.

3 What is an example of an ecosystem?

A forest is a common ecosystem. Forests consist of air, soil, water, nutrients, and particular species of animals, birds, insects, microorganisms, trees, and other plant life. If some of the trees are cut down, each of the other elements will be affected. Animals and birds may lose their habitats, soil may erode, nutrients may be displaced, and the flow of waterways may change.

4 What characteristics does an ecosystem have?

Ecosystems can be looked at in terms of their structure, the processes that go on within them, or the way they change over time. Every ecosystem is made up of a set of physical components (soil, minerals, water, etc.) and a set of populations of different species. Secondly, energy flows through ecosystems, and chemical elements cycle within them. Finally, ecosystems go through different patterns of change over time.

5 Why is the ecosystem concept important?

The concept of an ecosystem is important because it conveys one of the key insights that we have gained from the science of ecology, that everything is related to everything else. Everyday perception tells us that we live in a world composed of distinct units: trees, rocks, animals, buildings, and so on. Yet all of these seemingly unconnected fragments are in fact part of one system; they are interrelated, and this interrelation is essential for life. Since no piece exists independently of another, none can be modified without affecting the others. It is this idea that is behind the term "ecosystem."

Source: The Primer on Environmental Citizenship.

Copyright © 2000 Tierramérica. Todos los Derechos Reservados


A community of species./Claudio Contreras
  A community of species./Claudio Contreras