Evidence of a planktonic food web response to changes in nutrient input dynamics in the Mar Menor coastal lagoon, Spain
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AuthorPérez Ruzafa, Ángel; Gilabert Cervera, Francisco Javier; Gutiérrez Ortega, José Miguel; Fernández Alías, Alfredo; Marcos Diego, Concepción; [et al.]
PublisherKluwer Academic Publishers
Bibliographic CitationPérez-Ruzafa, A., Gilabert. J., Gutiérrez, J.M., Fernández, A.I., Marcos, C. & Sabah, S., 2002. Evidence of a planktonic food web response to changes in nutrient input dynamics in the Mar Menor coastal lagoon, Spain. Hydrobiologia, 475/476: 359-369.
Pelagic food web
Nutrient input dynamics in the Mar Menor coastal lagoon has recently changed as a consequence of changes in agricultural practises. An interannual comparison of the environmental variables and the planktonic biomass size-spectra was performed between 1988 and 1997. While nitrate concentration was low in 1988, the values in 1997 increased considerably. Since 1995, two alloctonous jellyfish species (Rhyzostoma pulmo and Cotylorhiza tuberculata) occurred in large numbers in summer time and reached peak abundance in summer of 1997. The size-spectra analysis comparison revealed that, in spite of changes in nutrient input that stimulated the growth of larger phytoplankton cells, there were no significant differences in the spectra slope which followed a similar seasonal trend in both years. However, the plankton biovolume considered under the size range compared (between 2 and 1000 µm diameter) was, paradoxically, always lower in 1997. Given that there were higher nutrient levels in 1997, this ...
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