Abstract
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 (<5 μm) was the most important contributor to total concentration. The ultraplankton in this system is related to influence of more oligotrophic open seawater. A greater proportion of microplankton (>20 μm) 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.
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Puigserver, M., Ramon, G., Moyà, G. et al. Planktonic chlorophyll a and eutrophication in two Mediterranean littoral systems (Mallorca Island, Spain). Hydrobiologia 475, 493–504 (2002). https://doi.org/10.1023/A:1020368215511
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DOI: https://doi.org/10.1023/A:1020368215511