Bibliothèque Tour du Valat

Se connecter

Mot de passe oublié ?
Pas encore inscrit ?

La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Détail

Ajouter au panier

Ajouter au panier

Lien vers la notice

Titre :	Planktonic chlorophyll a and eutrophication in two Mediterranean littoral systems (Mallorca Island, Spain)
Auteurs :	M. Puigserver, Auteur ; G. Ramon, Auteur ; G. Moya, Auteur ; A. Martinez-Taberner, Auteur
Type de document :	Article
Dans :	Hydrobiologia (475(1) MAY 2002)
Article en page(s) :	493-504
Résumé :	Two Mediterranean littoral systems of Mallorca Island have been studied using planktonic chlorophyll a (total concentration and seasonal variations) as trophic indicator. The studied systems are quite different in geomorphology, physicochemical trends and anthropic incidence. S'Albufera-Alcudia Bay is the drainage outlet of a coastal marsh, with a salt wedge estuarine regime. Andratx Harbour is a narrow bay affected by a high anthropic incidence due to the presence of a small fishing port and mainly a large leisure harbour. Both systems are affected by a typical Mediterranean climate and a negligible tide incidence. The present work is based on several year monitoring of physical, chemical and biological water parameters. In S'Albufera-Alcudia Bay, Chl a concentration ranged from 0.01 to 17.10 mg m(-3), the values dropping from the inland site to the sea. The phytoplankton biomass gradient takes its origin in physical and chemical differences. The variance is mainly related to the inland-sea water axis. Nitrogen and silica enriched inland waters are the main source of eutrophication, hence their relation with Chl a. These nutrients entering the Albufera are mainly derived from leaching from farmed soils. The transition from an inland eutrophic system to an oligotrophic marine one show the filter character of these coastal marshes. In Andratx Harbour, Chl a ranged from a non detectable concentration to 6.36 mg m(-3). The ultraplankton (20 mum) is related both to higher nutrient concentrations and a higher water column stability. In Andratx Harbour, the enclosure state seems very important for development of phytoplankton blooms.

FAQ

Infos pratiques

Heures d'ouverture et contact

Lundi , mardi et jeudi de 9h à 12h et de 13h à 17h00 : ouverture au public ...

Liens utiles

A-
A
A+