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Long-term changes in wetland habitats have been lately reported all over the world. Global warming and, in particular, irrigation and eutrophication of shallow lakes cause changes in vegetation, often in directions differing from the natural ecological succession. As a result, from the viewpoint of waterbirds, their nesting habitats deteriorate, which leads to changes in their breeding biology and...
The length and body weight at subsequent annuli of four facultative riverine fish species: roach (Rutilus rutilus L.), perch (Perca fluviatilis L.), bream (Abramis brama L.) and pike (Esox lucius L.) living in lakes and rivers were compared on the basis of published data. Pike grew better in lakes (significant differences in length, and some for weight), but the other species in rivers. However, significant...
The effect of dissolved organic carbon (DOC) on the environmental conditions of macrophytes has been studied in 35 lakes divided into soft- and hardwater: oligohumic (<4.0 mg C dm-3), α-mesohumic (4.0-8.0 mg C dm-3), β-mesohumic (8.1-16.0 mg C dm-3) and polihumic (>16.0 mg C dm-3). The optimum environmental conditions for macrophytes have been found in oligohumic lakes, characterised by low...
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