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  Botany online: Ecosystems - Nutrient Cycles

  https://web.archive.org/web/20141006044109/http://www.biologie.uni-hamburg.de/b-online/e54/54d.htm

  Keine Beschreibung vorhanden.

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  ZDB-Katalog - Suchergebnisseite: iss="0936-577X"

  https://zdb-katalog.de/list.xhtml?t=iss%3D%220936-577X%22&key=cql

  ZDB Zeitschriftendatenbank

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  Category:Ecosystems – Wikimedia Commons

  https://commons.wikimedia.org/wiki/Category:Ecosystems?uselang=de

  Keine Beschreibung vorhanden.

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  ZDB-Katalog - Suchergebnisseite: iss="0304-3770"

  https://zdb-katalog.de/list.xhtml?t=iss%3D%220304-3770%22&key=cql

  ZDB Zeitschriftendatenbank

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  Rivers of the United States, Volume V Part A: The Colorado River - Ruth Patrick - Google Books

  https://books.google.de/books?id=gAqJyNquhhAC&lpg=PP1&hl=de&pg=PA58#v=onepage&q&f=false

  Riverine systems are the most important source of potable surface waters for human beings and other animals that inhabit this planet. Despite this, very few books have been written concerning the species that form the ecosystems through which nutrients and…

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  European Ecosystems - G. Marcuzzi - Google Books

  https://books.google.de/books?id=zGXxCAAAQBAJ&pg=PA56#v=onepage

  There are many works, written in several European languages, on general, animal, and more especially vegetational ecology, but the space devoted to the study and description of the various ecosystems - both terrestrial and aquatic - of Europe is very…

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  Environmental Ethics: An Anthology - Google Books

  http://books.google.de/books?id=CmTgZ3cQOt0C&lpg=RA2-PA47&ots=QcejVFAbC7&dq=Is%20There%20a%20Need%20for%20a%20New,%20an%20Enviro

  Environmental Ethics: An Anthology brings together both classic and cutting-edge essays which have formed contemporary environmental ethics, ranging from the welfare of animals versus ecosystems to theories of the intrinsic value of nature.

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  West African Plants - A Photo Guide - Home

  http://www.westafricanplants.senckenberg.de

  This interactive photographic guide shall help you to identify higher plants from West African ecosystems. It contains images of ferns and seed plants taken in the field and a search function on character data.

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  West African Plants - A Photo Guide - Home

  http://www.westafricanplants.senckenberg.de/

  This interactive photographic guide shall help you to identify higher plants from West African ecosystems. It contains images of ferns and seed plants taken in the field and a search function on character data.

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  Deserts and Steppes - Google Books

  https://books.google.de/books?id=45htKs4GNi0C

  Characterized by uncompromising climate, sparse population density, and extreme aridity, deserts, steppes, and scrublands represent some of the least accessible regions on the planet. However, despite the severity of these ecosystems, they still boast…

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