Biomass and diversity of macrozoobenthos in the lake littoral in relation to environmental characteristics
Julkaistu sarjassa
Biological Research Reports from the University of JyväskyläTekijät
Päivämäärä
1996Partly due to the spatially and temporally heterogeneous lake shores there are only a few macrozoobenthos (MZ) studies that have tried to develop methods for studying the littoral MZ and identifying the most important factors structuring the littoral habitats. The present study describes some crucial factors affecting the ecology of the littoral MZ, especially the large invertebrates that are important as fish food. This information is necessary, for example, for constructing a model of the littoral systems and for reconditioning littoral habitats or restoring food webs in lakes. It was found that bottom freezing caused by water level regulation also notably affected the abundance, biomass and species richness of the littoral macrozoobenthos. Bottom freezing was spatially very restricted, however, and macrofauna survived better when organic content of the sediment was high. A strong relationship was found to exist between the MZ abundance and the species richness or between the MZ biomass and the species richness. The phosphorus content or colour of the water did not seem to explain the variation in species richness. The standardization of the habitats and varying vertical sampling scales had no clear effect on the results. As for the MZ biomass, the most important factors characterizing the structure of the shore habitats within lakes were the water content of the sediment and the exposure. The disturbance caused by water level fluctuation was another significant habitat variable affecting the MZ biomass. However, water level fluctuation is not a clearly defined factor. The MZ biomass was best explained by an index related to the extent of the illuminated littoral that was disturbed by the water level fluctuation. Water transparency is thus also a very important variable in this process. Predation by whitefish seemed to affect the total MZ abundance only slightly. However, diet shifts offish were caused by decreased abundance or size of the key prey species.
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ISBN
978-951-39-9063-3Julkaisuun sisältyy osajulkaisuja
- Artikkeli I: Palomäki, R. & Koskenniemi, E. (1993). Effects of bottom freezing on macrozoobenthos in the regulated Lake Pyhäjärvi. Archiv für Hydrobiologie, 128(1), 73-90, DOI: 10.1127/archiv-hydrobiol/128/1993/73
- Artikkeli II: Palomäki, R. & Paasivirta, L. (1993). Species richness of macrozoobenthos, especially chironomid communities, in the littoral zone of some Finnish lakes. Annales Zoologi Fennici, 30, 209-214. Full text
- Artikkeli III: Palomäki, R. (1994). Response by macrozoobenthos biomass to water level regulation in some Finnish lake littoral zones. Hydrobiologia, 286, 17-26. DOI: 10.1127/archiv-10.1007/BF00007277
- Artikkeli IV: Palomäki, R. & Hellsten, S. (1996). Littoral macrozoobenthos biomass in a continuous habitat series. Hydrobiologia, 339, 85–92. DOI: 10.1127/archiv-10.1007/BF00008916
- Artikkeli V: Palomäki, R., Jokela, J., Vuori, K-M. & Puro, A. (1992). Prey preference and timing of the diet shifts of Coregonus pidschian and C. lavaretus: Preliminary results of a field experiment. Polskie Archiwum Hydrobiologii, 39, 351-359.
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