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Hydrobiologia

, Volume 474, Issue 1–3, pp 91–105 | Cite as

Seasonal water quality of shallow and eutrophic Lake Pamvotis, Greece: implications for restoration

  • José R. RomeroEmail author
  • Iphigenia Kagalou
  • Jörg Imberger
  • Dimitra Hela
  • Melina Kotti
  • Aristides Bartzokas
  • Triantafyllos Albanis
  • Nicholaos Evmirides
  • Spiros Karkabounas
  • Joannis Papagiannis
  • Amalia Bithava
Article

Abstract

Lake Pamvotis is a moderately sized (22 km2) shallow (zavg=4 m) lake with a polymictic stratification regime located in northwest Greece. The lake has undergone cultural eutrophication over the past 40 years and is currently eutrophic (annual averages of FRP=0.07 mg P l-1, TP=0.11 mg P l-1, NH4+=0.25 mg N l-1, NO3=0.56 mg N l-1). FRP and NH4+ levels are correlated to external loading from streams during the winter and spring, and to internal loading during multi-day periods of summer stratification. Algal blooms occurred in summer (July–August green algae, August–September blue-green algae), autumn (October blue-green algae and diatoms), and winter (February diatoms), but not in the spring (March–June). The phytoplankton underwent brief periods of N- and P-limitation, though persistent low transparency (secchi depth of 60–80 cm) also suggests periods of light limitation. Rotifers counts were highest from mid-summer to early autumn whereas copepods were high in the spring and cladocerans were low in the summer. Removal of industrial and sewage point sources a decade ago resulted in a decrease in FRP. A phosphorus mass balance identified further reductions in external loading from the predominately agricultural catchment will decrease FRP levels further. The commercial fishery and lake hatchery also provides opportunities to control algal biomass through biomanipulation measures.

shallow lakes water quality eutrophication restoration 

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Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • José R. Romero
    • 1
    Email author
  • Iphigenia Kagalou
    • 2
  • Jörg Imberger
    • 3
  • Dimitra Hela
    • 4
  • Melina Kotti
    • 5
  • Aristides Bartzokas
    • 6
  • Triantafyllos Albanis
    • 4
  • Nicholaos Evmirides
    • 5
  • Spiros Karkabounas
    • 7
  • Joannis Papagiannis
    • 7
  • Amalia Bithava
    • 8
  1. 1.Centre for Water ResearchUniversity of Western AustraliaCrawleyAustralia
  2. 2.Municipal Enterprise of the Lake of IoanninaIoanninaGreece
  3. 3.Centre for Water ResearchUniversity of Western AustraliaCrawleyAustralia
  4. 4.Laboratory of Industrial Chemistry, Department of ChemistryUniversity of IoanninaIoanninaGreece
  5. 5.Laboratory of Analytical Chemistry, Department of ChemistryUniversity of IoanninaIoanninaGreece
  6. 6.Laboratory of Meteorology, Department of PhysicsUniversity of IoanninaIoanninaGreece
  7. 7.Medical FacultyUniversity of IoanninaIoanninaGreece
  8. 8.Region of EpirusIoanninaGreece

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