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  • Author: Mirosława Pietryka x
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Mirosława Pietryka, Dorota Richter and Magda Podlaska

Abstract

The data presented in this paper concern the occurrence of Salvinia natans (L.) All. in Wrocław area. Field research was conducted in the vegetation season (June-September) between 2013 and 2017 in water bodies (natural and artificial), in the main river beds of the Oława and the Odra Rivers and in the Odra canals in Wrocław. The study provided 32 S. natans locations in the city area. The studied species occurred in various plant communities accompanied by numerous species which were also under protection, increasing the ecological value of the habitats. Additionally, a stable S. natans site was confirmed by the study in a location where aquatic fern had previously been recorded in Wrocław. The research indicates numerous populations of the species along the Odra and the Oława and in many old river beds and artificial water bodies in Wrocław and the results confirm the visible trend of a growing number of S. natans sites in all of Poland.

Open access

Dorota Richter, Mirosława Pietryka and Jan Matuła

Abstract

The paper presents the results of a study of cyanobacteria and green algae assemblages occurring in various tundra types determined on the basis of mosses and vascular plants and habitat conditions. The research was carried out during summer in the years 2009-2013 on the north sea-coast of Hornsund fjord (West Spitsbergen, Svalbard Archipelago). 58 sites were studied in various tundra types differing in composition of vascular plants, mosses and in trophy and humidity. 141 cyanobacteria and green algae were noted in the research area in total. Cyanobacteria and green algae flora is a significant element of many tundra types and sometimes even dominate there. Despite its importance, it has not been hitherto taken into account in the description and classification of tundra. The aim of the present study was to demonstrate the legitimacy of using phycoflora in supplementing the descriptions of hitherto described tundra and distinguishing new tundra types. Numeric hierarchical-accumulative classification (MVSP 3.1 software) methods were used to analyze the cyanobacterial and algal assemblages and their co-relations with particular tundra types. The analysis determined dominant and distinctive species in the communities in concordance with ecologically diverse types of tundra. The results show the importance of these organisms in the composition of the vegetation of tundra types and their role in the ecosystems of this part of the Arctic.

Open access

Dorota Richter, Jan Matuła and Mirosława Pietryka

Abstract

This article describes the morphological characteristics of the populations of green alga, Tetraspora gelatinosa, growing in the stressful Arctic conditions (77°00’22” N, 015°32’54.33” E). We present the first detailed morphological characteristics of this spe-cies from such a high latitude. Populations from both stagnant and flowing waters were studied. Depending on the type of habitat, their mucilaginous colonies (thalli) have differ-ent shapes, but the structure, size and the placement of the vegetative cells, akinetes and ameboid forms, as well as the pseudocilia morphology of both populations, were very simi-lar. Literature data on the distribution of T. gelatinosa indicate that it is a cosmopolitan spe-cies. Our data are compared with some characteristic features of this species growing in dif-ferent geographical and climatic zones. No significant differences were found in the morphology of the colonies compared, nor in the location and the inner structure of cells. How-ever, there were slight differences in cell size between the populations from warm and cold zones.

Open access

Mirosława Pietryka, Dorota Richter and Jan Matuła

Abstract

The aim of the study was to compare cyanobacterial and algal assemblages occurring in ornithocoprophilous habitats formed under the influence of two seabird colonies (mixed colony of piscivorous Uria lomvia and Rissa tridactyla and planktivorous Alle alle) nesting on the southwest side of Hornsund (Spitsbergen). Various influences of the bird colonies (e.g. surface trophy, treading) lead to the formation of ornithogenic habitats with quantitatively and qualitatively diverse cyanobacterial and algal assemblages. Only 6 species common to both habitats were identified, but due to their different proportions the similarity ended there. Cyanobacterial and algal assemblages of both ornithogenic habitats also react rather differently to the intensity of the bird colonies’ influence. The assemblages located directly beneath piscivorous bird nests were characterized by a larger number of species, which decreased the farther from the colony it was. Cyanobacterial and algal assemblages located directly next to planktivorous bird nests were species poor, but species richness increased at locations farther from their direct influence. The obtained results confirmed that bird colonies characterized by different diet and behavior influenced the formation of two separate, quantitatively and qualitatively different cyanobacterial and algal assemblages. Species such as Eucapsis sp., Gleocapsopsis sp., Gloeothece sp., Woronichinia sp., Hematococcus sp. were characteristic for algae and cyanobacteria assemblages in the vicinity of piscivorous bird colonies, whereas Aphanocapsa sp., Gloeothece sp., Komvophoron minutum, Pseudanabaena sp., Gloeocystis sp. 2 occurred in the vicinity of planktivorous bird colonies.