A test of food web hypotheses by exploring time series of fish, zooplankton and phytoplankton in an oligo-mesotrophic lake
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Tartalom: http://dx.doi.org/10.1016/j.limno.2008.05.001
Archívum: MTA Könyvtár
Gyűjtemény: Status = Published




Type = Article
Cím:
A test of food web hypotheses by exploring time series of fish, zooplankton and phytoplankton in an oligo-mesotrophic lake
Létrehozó:
Mehner, Thomas
Padisák, Judit
Kasprzak, Peter
Koschel, Rainer
Krienitz, Lothar
Kiadó:
Elsevier
Dátum:
2008
Téma:
QE08 Hydrosphere. Hydrology / hidroszféra, hidrológia
QH301 Biology / biológia
QK Botany / növénytan
QL Zoology / állattan
Tartalmi leírás:
The strength of trophic cascades in the pelagic area of lakes at low productivity has been discussed intensively, but
predictions of trophic coupling differ strongly. Many studies suggest that trophic cascades are weak in oligotrophic
lakes, but some models discussed that trophic interactions might be strong at low nutrient concentration. Here, we
used time series over 9 (phytoplankton and zooplankton) or 6 (fish) years from the oligo-mesotrophic Lake Stechlin
(Germany) to explore correlative relationships between biomasses of these trophic levels. The fourth trophic level of
piscivorous fish was almost absent in the pelagic area. The biomass of planktivorous coregonid fishes was not at all
correlated to total zooplankton biomass, which was dominated by calanoid copepods. However, there was a strong
negative correlation of adult coregonid biomass to the proportion of Daphnia in zooplankton, and a strong positive
correlation of adult fish to proportion of calanoid copepods. Zooplankton and phytoplankton biomasses were not
correlated except for a significantly negative correlation between Daphnia biomass and biomass of Cyanobacteria.
Overall, our results suggest that planktivorous fish may modify the zooplankton structure, but not the zooplankton
biomass, in lakes of low productivity. However, this top-down effect by fish does not cascade further down to the
phytoplankton biomass or community structure, confirming earlier hypotheses that trophic cascades are weak in
oligotrophic lakes.
Típus:
Article
PeerReviewed
Formátum:
text
Azonosító:
Mehner, Thomas and Padisák, Judit and Kasprzak, Peter and Koschel, Rainer and Krienitz, Lothar (2008) A test of food web hypotheses by exploring time series of fish, zooplankton and phytoplankton in an oligo-mesotrophic lake. Limnologica, 38 (3-4). pp. 179-188. ISSN 0075-9511
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