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In our study we analyzed the species composition of fungi and heterotrophic straminipiles in four ponds of a fish farm in Popielewo and in four ponds in Poryta Jabłoń situated in the vicinity of Knyszyn, Poland. Samples of water were collected during the spring and autumn of 2009. Fourty-two species (11 fungi and 31 heterotrophic straminipiles) were recovered. We found some potential pathogens of economically valuable fish and fish spawn, such as Achlya americana, Ac. polyandra, Saprolegnia ferax, and S. parasitica. In addition, we found some common human pathogens such as Aspergillus niger, and Candida tropicalis. Some saprotrophs such as Rhizophlyctis rosea, Nowakowskiella elegans, Olpidiopsis saprolegniae, Pythium debaiyanum, Py. gracile, Py. hemmianum, and Py. inflation appeared to be relatively common. Most species of fungi and straminipiles were recovered from ponds in Poryta Jabłoń (34), while the smallest number was found in Popielewo ponds (25). The physico-chemical analysis of water showed that ponds in Poryta Jabłoń were the least polluted with organic matter, whereas biogenic compounds were most abundant in Popielewo.
Our study involved the quantitative analysis of species composition of fungi and straminipilous organisms in four ponds situated in Białystok, Poland. The observations performed in April and November 2006 with respect to hydrochemical conditions revealed the occurrence of 48 species, including 9 fungi and 39 straminipilous organisms. Among species of fungi and straminipilous organisms, we found such pathogens of crustaceans and fish as Achlya dubia, Ac. oblongata, Ac. polyandra, Aphanomyces bosminae, Ap. laevis, Dictychus monosporus, Pythium jirovecii, Py. undulatum, Saprolegnia ferax, S. parasitica, S. pseudocrustosa and Thraustotheca clavata. The human pathogens Aspergillus niger, Candida tropicalis and Catenophlyctis variabilis as well as plant pathogens Pythium butleri and Py. debaryanum were also found. Such phytosaprophytes as Achlya klebsiana, Karlingia rosea, Nowakowskiella elegans, N. macrospora, Pythium akanense, Py. aquatile, Py. elongatum, Py. inflatum and Py. intermedium were relatively common. Most species of fungi and straminipilous organisms were found to grow in Dojlidy Pond (27), the fewest in Akcent Pond (14). The hydrochemical analysis of water showed that Dojlidy was the least burdened with organic matter, whereas Akcent was the most abundant in biogenic compounds.
Zoosporic and conidial fungi species and environmental factors in 12 various sites of the River Biebrza in Biebrza National Park were studied. Samples of water were collected in autumn 1999 and spring 2000 for hydrochemical analysis in order to determine the number of fungal species. Buckwheat-seeds, hemp- seeds, cellophane and snake exuviae were used as bait during exposure in a laboratory. 199 lower aquatic fungus species were found in various sites of the River Biebrza. 16 species were recorded for the first time from Poland.
The authors described and illustrated 8 rare aquatic fungus-like organisms of the order Lepto­mitales (Chromista), which were isolated from the water of nine water bodies of different trophy of north-eastern Poland: Apodachlya punctata, Apodachlyella completa, Araiospora spinosa, Mindeniella spinospora, Nellymyces megaceros, Rhipidium europaeum, Sapromyces androgynus, and Sapromyces elongatus.
The rare fungus Aqualinderella fermentans was recorded from the fruits and seeds of 24 species of plants in nine bodies of water of various trophic states in northeastern Poland. This species was recorded for the first time in Polish waters and for the second time in Europe. Our study shifts the range of Aqualinderella fermentans to the north (53°52’N, 22°58’E) from the subtropical and tropical zones where it is known to occur.
The authors investigated the influence of 9 species of aquatic plants (Ceratophyllum demersum, Elodea canadensis, Hydrocharis morsus-ranae, Lemna minor, Nuphar luteum, Potamogeton natans, Sagittaria sagittifolia, Sparganium ramosum, Stratiotes aloides) on the occurrence of aquatic zoosporic fungus species in the water of three water bodies of different trophy. The fewest fungi were noted in the containers with Potamogeton natans (9), Elodea canadensis (15) and Hydrocharis morsus-ranae (16), the most in containers with Sparganium ramosum (23), Lemna minor (24) and Nuphar luteum (25). More fungi were found to grow in the containers with 7 plants than in the controls (the mean ratio of Co/Pl ranged from 1.7/3.7 to 6.7/8.7). However, for Potamogeton natans and Sparganium ramosum, control samples contained more fungus species. The mean ratio for the samples with Potamogeton natans was 5.7/2.7 and with Sparganium ramosum – 6.3/5.4.
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