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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Nitrogen, macrophytes, shallow lakes and nutrient limitation: resolution of a current controversy? (2013)
Titre original:	Nitrogen, macrophytes, shallow lakes and nutrient limitation
Auteurs :	Brian Moss, Auteur ; Erik Jeppesen, Auteur ; Martin Søndergaard, Auteur ; Torben L. Lauridsen, Auteur ; Zhengwen Liu, Auteur
Type de document :	Article
Dans :	Hydrobiologia (709(1) 2013/06/01)
Article en page(s) :	3-21
Langues:	Anglais
Résumé :	Phosphorus (P) is conventionally thought to limit production in freshwaters and nitrogen (N) that in the sea. Before much human activity, however, co-limitation by N and P was probably normal, with systems developing ratios of N to P tending to the Redfield ratio. Single-factor limitation may be a symptom of human activity in many cases. It is widely believed that N fixation should compensate for N shortage because N fixers are ubiquitous and versatile, but this is not always the case and the issue has hitherto been considered largely with respect to plankton communities. Effects of N on macrophyte communities provide justification for control of both nutrients, at least in shallow lakes and estuaries. Increased N loading reduces plant biodiversity, changes the structure, and is associated with eventual loss, of macrophyte communities. P control alone may suffice in many deep lakes where denitrification is low and stratified conditions favour cyanobacterial development. Therein may lie a resolution to current controversies.
En ligne :	http://link.springer.com/article/10.1007/s10750-012-1033-0

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