Electronic Journal of Polish Agricultural Universities (EJPAU) founded by all Polish Agriculture Universities presents original papers and review articles relevant to all aspects of agricultural sciences. It is target for persons working both in science and industry,regulatory agencies or teaching in agricultural sector. Covered by IFIS Publishing (Food Science and Technology Abstracts), ELSEVIER Science - Food Science and Technology Program, CAS USA (Chemical Abstracts), CABI Publishing UK and ALPSP (Association of Learned and Professional Society Publisher - full membership). Presented in the Master List of Thomson ISI.
2003
Volume 6
Issue 2
Topic:
Environmental Development
ELECTRONIC
JOURNAL OF
POLISH
AGRICULTURAL
UNIVERSITIES
Gotkowska-Płachta A. , Niewolak S. , Korzeniewska E. 2003. VERTICAL DISTRIBUTION AND SEASONAL CHANGES IN THE NUMBER OF BACTERIOPLANKTON IN THE WATER OF LAKE HAŃCZA, PARTICULARLY IN THE PERIOD OF RESERVOIR SUMMER STRATIFICATION, EJPAU 6(2), #10.
Available Online: http://www.ejpau.media.pl/volume6/issue2/environment/abs-10.html

VERTICAL DISTRIBUTION AND SEASONAL CHANGES IN THE NUMBER OF BACTERIOPLANKTON IN THE WATER OF LAKE HAŃCZA, PARTICULARLY IN THE PERIOD OF RESERVOIR SUMMER STRATIFICATION

Anna Gotkowska-Płachta, Stanisław Niewolak, Ewa Korzeniewska

 

ABSTRACT



The paper presents the results of the study on seasonal changes in the number of bacterioplankton, its vertical distribution and morphological composition in the waters of the deepest Polish lake, Lake Hańcza (108.5 m deep). The research was performed from 1997 till 2000. Water samples were collected at a research station placed at a location where the lake depth was maximum, at monthly intervals from May to October. Water was sampled along the following depth profile: from 0-1 cm layer, at 0.3 m and at the depth of 1m, 2m, 5m, 10m, deeper down at 10m intervals towards the bottom. Bacteriological analyses were completed with measurements of selected physico-chemical parameters such as temperature, pH, oxygen, nitrogen and phosphorus contents. Obtained results with regards both to the number of bacterioplankton and its morphological structure, namely 68% for cylindrical rods forms, and physico-chemical assays confirmed the purity of Lake Hańcza. The vertical distribution of bacterioplankton

Key words: Bacterioplankton, lake, physico-chemical parameters..