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Hydrobiologia

, Volume 363, Issue 1–3, pp 81–95 | Cite as

Relations between planktivorous fish abundance, zooplankton and phytoplankton in three lakes of differing productivity

  • Jouko Sarvala
  • Harri Helminen
  • Vesa Saarikari
  • Seppo Salonen
  • Kristiina Vuorio
Article

Abstract

Water chemistry, phytoplankton, zooplankton and fish populations werestudied over several years in three shallow, non-stratified lakes withdiffering nutrient loadings and fish communities in southwest Finland. LakePyhäjärvi was weakly mesotrophic in 1980–1996, LakeKöyliönjärvi was highly eutrophic in 1991–1996, andLake Littoistenjärvi was mesotrophic in 1993–1996 and eutrophicin 1992. In Lake Pyhäjärvi, natural year-class fluctuations ofvendace and smelt (range of combined biomass 5–28 kgha™1) caused significant variation in planktivory. The verydense fish stocks of Lake Köyliönjärvi (mainly roach, breamand smelt) were decimated from >175 kg ha™1 in 1991 toabout 50 kg ha−1 in 1996 by removal fishing. The roach stockof Lake Littoistenjärvi declined from about 71 kg ha−1 toabout 28 kg ha−1 during 1993–1996. In LakePyhäjärvi, strong stocks of planktivorous fish were accompaniedwith depressed crustacean zooplankton biomass, reduced role of calanoids andcladocerans, a low proportion of larger cladocerans (length > 0.5 mm),and a high chlorophyll level. In the lakes Littoistenjärvi andKöyliönjärvi, zooplankton was dependent on both fish andphytoplankton: in spite of dense fish stocks, a high crustacean biomassdeveloped in a phytoplankton peak year, but it was dominated by very smallcladocerans. In Lake Pyhäjärvi, late summer chlorophyllconcentration was predictable from total phosphorus in water and cladoceranbiomass (r2 = 0.68), both factors explaining roughlysimilar fraction of total variation. In combined data from all three lakes,chlorophyll was almost solely dependent on total phosphorus, while thecladocerans were regulated both from below by productivity and from above byfish. Our data from Pyhäjärvi lend support to consumer regulationof late summer phytoplankton; low chlorophyll values prevailed whenplanktivorous fish biomass was below 15 kg ha−1. In largeeutrophic lakes it may be difficult to reduce fish stocks to such a lowlevel: in Lake Köyliönjärvi, after six years of removalfishing, fish biomass still remained higher, and changes in plankton wereaccordingly small. Unexpectedly, in 1993–1996, phytoplankton biomassin Littoistenjärvi remained low in spite of low crustacean zooplanktonbiomass; submerged macrophytes probably regulated the water quality.

phytoplankton zooplankton planktivorous fish phosphorus biomanipulation trophic interactions 

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Copyright information

© Kluwer Academic Publishers 1998

Authors and Affiliations

  • Jouko Sarvala
    • 1
  • Harri Helminen
    • 2
  • Vesa Saarikari
    • 1
  • Seppo Salonen
    • 3
  • Kristiina Vuorio
    • 1
  1. 1.Department of BiologyUniversity of TurkuTurkuFinland
  2. 2.Southwest Finland Regional Environment CentreTurkuFinland
  3. 3.Satakunta Environmental Research CentreUniversity of TurkuPoriFinland

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