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Écologie 3

Écologie des écosystèmes

QuestionAnswer
Qu'est-ce-qu'un écosystème? Un ensemble formé, dans une aire donnée, par la communauté d'êtres vivants et son environnement.
Nomme 5 facteurs abiotiques qui influent sur un écosystème. Température, eau, pH, lumière, vent, roches et sols, matière inorganique essentielle et présence de polluants.
Quels sont les 4 critères qui définissent la nature d'un écosystème? La communauté, la productivité primaire nette, la pyramide écologique et les cycles biogéochimiques.
Qu'est-ce-qui définit le rythme auquel les producteurs acquièrent une certaine qté d'énergie et l'emmagasinent dans leurs tissus durant une période déterminée? La productivité primaire.
Quelle est la différence entre la productivité primaire et la productivité primaire brute? La brute est celle capté par les producteurs d'un écosystème, alors que la nette est celle qui est disponible au niveau suivant.
Created by: 1553656660
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