ORIGINAL RESEARCH
Co-occurrence of Two Stoneworts of Reverse Ecological
Spectra in the Same Lake Ecosystem. Habitat
requirements of Chara delicatula Agardh and Chara
globularis Thuillier in the Context of Bioindication
M. Pełechaty 1*, A. Pukacz 2, A. Pełechata 3
Adam Mickiewicz University, Poznań; Europa-Universität Viadrina, Frankfurt (Oder)
1 Department of Hydrobiology AMU, Marcelińska Str. 4, 60-801 Poznań, Poland
2 Collegium Polonicum AMU-EUV, Kościuszki Str. 1, 69-100 Słubice, Poland
3 Department of Hydrobiology AMU, Marcelińska Str. 4, 60-801 Poznań, Poland; AMU– EUV, Collegium Polonicum, Kościuszki Str. 1, 69-100 Słubice, Poland
1 Department of Hydrobiology AMU, Marcelińska Str. 4, 60-801 Poznań, Poland
2 Collegium Polonicum AMU-EUV, Kościuszki Str. 1, 69-100 Słubice, Poland
3 Department of Hydrobiology AMU, Marcelińska Str. 4, 60-801 Poznań, Poland; AMU– EUV, Collegium Polonicum, Kościuszki Str. 1, 69-100 Słubice, Poland
Pol. J. Environ. Stud. 2004;13(5):551–556
KEYWORDS
ABSTRACT
Regarding their distribution in lakes, Chara delicatula and Chara globularis are considered species
of different or even opposite ecological requirements. C. delicatula is usually reported from oligotrophic
lakes, but C. globularis from more fertile ones. Within Poland, both species rarely build extensive stands in
the same ecosystem. The present study was carried out in a stratified, mid-forest lake in midwestern Poland
where C. delicatula had not been found earlier. Based on the physical-chemical properties and analyses of
phytoplankton, a transitional, meso-eutrophic status of the lake was stated. In the group of 15 more frequent
macrophyte species, C. delicatula and C. globularis were among plants predominating the lake’s macrovegetation.
Both stoneworts built separate patches as well as contributed to other macrophyte assemblages.
Growing under the same light and trophic conditions, the species revealed differences in ecological optima
in relation to the depth of occurrence and bottom slope. The results are discussed in the context of the species
identity: are C. delicatula and C. globularis separate species or forms within the same taxon?
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