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Some interesting colourless euglenophytes found in Southern Poland

100%

Cabala J.

Acta Societatis Botanicorum Poloniae

2003

tom 72

nr 3

This study present 9 species of colourless euglenoid flagellates found in a small peat bog in Budzyń, a village north-west of Cracow, which belongs to the Małopolska Upland (Southern Poland). This threatened peat bog is covered with rubble brought from neighbouring Cracow. Only ca 30% of its area is relatively little influenced by human activity. Many of the present species are rarely and infrequently reported from nature. Three species, including Rhabdomonas incurva Fresenius, Entosiphon obliąuum Klebs, E. ovatum Stokes, and one variety Menoidium pellucidum Perty var. gracile (Playfair) Popova have been recorded for the first time from Poland. Three species Astasia dangeardii Lemmermann var. dangeardii, Rhabdomonas costata (Korsikov) Pringsheim and Entosiphon sulcatum (Dujardin) Stein var. sulcatum Stein are new for the flora of Cracow-Częstochowa Upland. The remaining taxa: Menoidium pellucidum Perty var. pellucidum and M. tortuosum (Stokes) Senn var. tortuosum are very rarely recorded from Poland. For each species illustrations, taxonomic information and biogeographical data are given.

Ecological indices as a tool for assessing pollution in El-Dekhaila Harbour (Alexandria, Egypt)

80%

Ismael A. A., Dorgham M. M.

Oceanologia

2003

tom 45

nr 1

Statistical analyses of data concerning the phytoplankton standing crop and biomass were applied as a tool for assessing pollution in El-Dekhaila Harbour. Univariate and multivariate analysis showed a succession of three clusters associated with salinity and temperature variations. The first and third clusters comprised mainly diatoms and dinoflagellates. The second cluster, richer in species, was dominated by brackish water cyanophytes, chlorophytes and euglenophytes. The diversity index ranged from 0.08 to 2.41. A high diversity was associated with high evenness, reflecting the multidominance pattern of cluster (2). On the other hand, multiple correlations between salinity and standing crop, richness and evenness, were negative and significant, but positive with the diversity index. The ABC curve showed that the k-dominance curve for numerical abundance extends above that for the biomass when clusters 1an d 3 are dominant. Both curves coincide more or less for another segment of the curve but when cluster 2 becomes dominant the numerical abundance curve runs below that of the biomass. Such a pattern may indicate unpolluted or moderate to heavily polluted conditions in El-Dekhaila Harbour. The present study reveals that the combination of univariate and multivariate analysis with the ABC curve provides a promising tool for the characterization of phytoplankton dynamics under stress conditions. On the other hand, the phytoplankton community in El-Dekhaila Harbour is stressed not by the inflow of brackish water but rather by the inflow of sea water. This is indicated by the higher diversity and evenness, and by the ABC curve during the dominance of cluster (2).

Ograniczanie wyników

1 Acta Societatis Botanicorum Poloniae

1 Oceanologia

1 Cabala J.

1 Dorgham M. M.

1 Ismael A. A.

2 2003

Wyniki wyszukiwania

Some interesting colourless euglenophytes found in Southern Poland

Ecological indices as a tool for assessing pollution in El-Dekhaila Harbour (Alexandria, Egypt)