Professor, DrSc in botany with interests mainly in the field of algology, limnology, mycology, lichenology, ecology, ethnobotany and ethnomycology Address: Sofia, Sofia-Capital, Bulgaria
А NEW METHOD FOR ASSESSMENT OF THE RED LIST THREAT STATUS OF MICROALGAE, 2016
Although the IUCN Red List Categories and Criteria is a widely internationally used system for cl... more Although the IUCN Red List Categories and Criteria is a widely internationally used system for classifying species at high risk of extinction, the micro-organisms are still practically excluded from the appropriately enlisted taxa. The present paper provides a method, which gives means to assess microalgae threat status much more objectively than it was possible before and in this way to achieve quite high degree of generalization in work with this peculiar group of organisms. The method described below uses the widely accepted standard IUCN Red List system of categories, but proposes their assignment on the basis of a complex application of seven criteria relevant to microalgae and classical data, available for them. These criteria can be interpreted in the same way for all taxonomic groups of algae and for all possible territorial levels (local, national, regional, global). The criteria are denominated with Latin capital letters A-G and each of them has a numerical expression with values (points) ranging between 4 and 1. he fi nal assessment of the threat status is done on the basis of the total amount of points (T), which ranges between 7 and 28. In this way each alga is supplied with a formula (a combination of letters and numbers), which indicates its threat status and in the same time outlines its most critical, “weak spots” on which special attention has to be paid when conservation measures have to be proposed. As it is exemplifi ed in detail in the paper, the formula could be expressed in a table or in a text format, in full or in a short version, depending on the needs of the relevant studies or proposals (e.g. Anabaena lapponica Borge [VU – A3 B4 C4 D2 E2 F2 G3], or Anabaena lapponica Borge [VU – A3 B4 C4 D2 E2 F2 G3 T20], or Anabaena lapponica Borge [VU – T20]), or Anabaena lapponica Borge [VU]).
... Development of the phytoplankton of the shallow Srebarna Lake (north-eastern Bulgaria) across... more ... Development of the phytoplankton of the shallow Srebarna Lake (north-eastern Bulgaria) across a trophic gradient Maya Petrova Stoyneva Department of Botany, Faculty of Biology, Sofia University 'St Kliment Ohridski', 8 bld. Dragan Zankov, 1421, Sofia, Bulgaria ...
The paper presents data on the biodiversity of prokaryotic and eukaryotic algae in the tropical L... more The paper presents data on the biodiversity of prokaryotic and eukaryotic algae in the tropical Lake Edward, compiled from publications of the Damas mission (1935-1936), Hecky & Kling (1987) and our own results from a recent investigation of the lake phytoplankton in a three-year period (2016-2018) in the frame of the HIPE (Human impacts on ecosystem health and resources of Lake Edward) project (http://www.co2.ulg.ac.be/hipe). The provided checklist is based on modern algal taxonomy with relevant synonymizing of lists of previous authors. In total, 577 taxa from seven divisions were registered in the lake waters and in the Kazinga Channel. The richest division was Ochrophyta (287 taxa, 274 of which from Bacillariophyceae), followed by Chlorophyta (131 taxa), Cyanoprokaryota (134), Streptophyta (14), Euglenophyta (8), Pyrrhophyta (5) and Cryptophyta (1). 52 species (or only 1% of the taxa found) persisted in the lake since 30s of the 20th century till nowadays. More than half of the cyanoprokaryotes (65) are potentially toxic and harmful species. The checklist contains also data on algal abundance and frequency of occurrence, originally provided by the authors. In the phytoplankton samples, collected during the three cruises of the HIPE project, 248 taxa were found, among which the richest division was Cyanoprokaryota (104). From this total of 248 taxa, only 3 were frequent and 199 were very rare (from 1-3 samples) with 121 taxa found in one sample only. During 2016-2018, the most abundant species in the lake phytoplankton belonged to Cyanoprokaryota, Bacillariophyceae and Chlorophyta. The algae found in the lake have different ecological requirements and besides clear tropical species and some cosmopolites, some “cold water species” from northern and temperate regions were found. For them, as well as for some thermophilic species, considered alien for the lake, transport through different vectors was supposed. In the literature analyzed, 36 new taxa were described. Among them 26 taxa had Lake Edward as a single locality, and 10 were found also in other lakes and adjacent water bodies. Twelve of these new taxa were checked by modern taxonomists, but 24 still need taxonomic reconsideration
... Laboratory of General Ecology, Bulgarian Academy of Sciences, 2 Gagarin Street, 1113 Sofia Ge... more ... Laboratory of General Ecology, Bulgarian Academy of Sciences, 2 Gagarin Street, 1113 Sofia Gergana P. Vasileva Central Laboratory of General Ecology, Bulgarian Academy of Sciences, 2 Gagarin Street, 1113 Sofia Vladimir A. Velev ... These are: Myriapoda (Mr P. Stoev, pers. ...
Three green algae – Palmellopsis texensis, Chlorococcum pinguideum and Chlorella minutissima – we... more Three green algae – Palmellopsis texensis, Chlorococcum pinguideum and Chlorella minutissima – were isolated from the soil remnants among the plant roots of a herbarium specimen, kept 20 years in air-dry conditions without any chemical or freezing preservation treatment. The first two species are new for the algal flora of Bulgaria. Cytomorphology and reproduction of the isolate similar to Palmellopsis texensis were investigated in detail and data obtained were compared with the original species description of Groover & Bold (1969). Two differences from the original diagnosis were detected: presence of pulsating vacuoles in the vegetative cells of our isolate and its reproduction only by zoospores. All features of the architecture of zoospores coincide well with the original description. Further studies could verify if our isolate belongs to Palmellopsis texensis, as it is for the moment designated here, or is a distinct species.
А NEW METHOD FOR ASSESSMENT OF THE RED LIST THREAT STATUS OF MICROALGAE, 2016
Although the IUCN Red List Categories and Criteria is a widely internationally used system for cl... more Although the IUCN Red List Categories and Criteria is a widely internationally used system for classifying species at high risk of extinction, the micro-organisms are still practically excluded from the appropriately enlisted taxa. The present paper provides a method, which gives means to assess microalgae threat status much more objectively than it was possible before and in this way to achieve quite high degree of generalization in work with this peculiar group of organisms. The method described below uses the widely accepted standard IUCN Red List system of categories, but proposes their assignment on the basis of a complex application of seven criteria relevant to microalgae and classical data, available for them. These criteria can be interpreted in the same way for all taxonomic groups of algae and for all possible territorial levels (local, national, regional, global). The criteria are denominated with Latin capital letters A-G and each of them has a numerical expression with values (points) ranging between 4 and 1. he fi nal assessment of the threat status is done on the basis of the total amount of points (T), which ranges between 7 and 28. In this way each alga is supplied with a formula (a combination of letters and numbers), which indicates its threat status and in the same time outlines its most critical, “weak spots” on which special attention has to be paid when conservation measures have to be proposed. As it is exemplifi ed in detail in the paper, the formula could be expressed in a table or in a text format, in full or in a short version, depending on the needs of the relevant studies or proposals (e.g. Anabaena lapponica Borge [VU – A3 B4 C4 D2 E2 F2 G3], or Anabaena lapponica Borge [VU – A3 B4 C4 D2 E2 F2 G3 T20], or Anabaena lapponica Borge [VU – T20]), or Anabaena lapponica Borge [VU]).
... Development of the phytoplankton of the shallow Srebarna Lake (north-eastern Bulgaria) across... more ... Development of the phytoplankton of the shallow Srebarna Lake (north-eastern Bulgaria) across a trophic gradient Maya Petrova Stoyneva Department of Botany, Faculty of Biology, Sofia University 'St Kliment Ohridski', 8 bld. Dragan Zankov, 1421, Sofia, Bulgaria ...
The paper presents data on the biodiversity of prokaryotic and eukaryotic algae in the tropical L... more The paper presents data on the biodiversity of prokaryotic and eukaryotic algae in the tropical Lake Edward, compiled from publications of the Damas mission (1935-1936), Hecky & Kling (1987) and our own results from a recent investigation of the lake phytoplankton in a three-year period (2016-2018) in the frame of the HIPE (Human impacts on ecosystem health and resources of Lake Edward) project (http://www.co2.ulg.ac.be/hipe). The provided checklist is based on modern algal taxonomy with relevant synonymizing of lists of previous authors. In total, 577 taxa from seven divisions were registered in the lake waters and in the Kazinga Channel. The richest division was Ochrophyta (287 taxa, 274 of which from Bacillariophyceae), followed by Chlorophyta (131 taxa), Cyanoprokaryota (134), Streptophyta (14), Euglenophyta (8), Pyrrhophyta (5) and Cryptophyta (1). 52 species (or only 1% of the taxa found) persisted in the lake since 30s of the 20th century till nowadays. More than half of the cyanoprokaryotes (65) are potentially toxic and harmful species. The checklist contains also data on algal abundance and frequency of occurrence, originally provided by the authors. In the phytoplankton samples, collected during the three cruises of the HIPE project, 248 taxa were found, among which the richest division was Cyanoprokaryota (104). From this total of 248 taxa, only 3 were frequent and 199 were very rare (from 1-3 samples) with 121 taxa found in one sample only. During 2016-2018, the most abundant species in the lake phytoplankton belonged to Cyanoprokaryota, Bacillariophyceae and Chlorophyta. The algae found in the lake have different ecological requirements and besides clear tropical species and some cosmopolites, some “cold water species” from northern and temperate regions were found. For them, as well as for some thermophilic species, considered alien for the lake, transport through different vectors was supposed. In the literature analyzed, 36 new taxa were described. Among them 26 taxa had Lake Edward as a single locality, and 10 were found also in other lakes and adjacent water bodies. Twelve of these new taxa were checked by modern taxonomists, but 24 still need taxonomic reconsideration
... Laboratory of General Ecology, Bulgarian Academy of Sciences, 2 Gagarin Street, 1113 Sofia Ge... more ... Laboratory of General Ecology, Bulgarian Academy of Sciences, 2 Gagarin Street, 1113 Sofia Gergana P. Vasileva Central Laboratory of General Ecology, Bulgarian Academy of Sciences, 2 Gagarin Street, 1113 Sofia Vladimir A. Velev ... These are: Myriapoda (Mr P. Stoev, pers. ...
Three green algae – Palmellopsis texensis, Chlorococcum pinguideum and Chlorella minutissima – we... more Three green algae – Palmellopsis texensis, Chlorococcum pinguideum and Chlorella minutissima – were isolated from the soil remnants among the plant roots of a herbarium specimen, kept 20 years in air-dry conditions without any chemical or freezing preservation treatment. The first two species are new for the algal flora of Bulgaria. Cytomorphology and reproduction of the isolate similar to Palmellopsis texensis were investigated in detail and data obtained were compared with the original species description of Groover & Bold (1969). Two differences from the original diagnosis were detected: presence of pulsating vacuoles in the vegetative cells of our isolate and its reproduction only by zoospores. All features of the architecture of zoospores coincide well with the original description. Further studies could verify if our isolate belongs to Palmellopsis texensis, as it is for the moment designated here, or is a distinct species.
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