Pub Date : 2020-01-01DOI: 10.21685/1680-0826-2020-14-3-5
R. Saito, R. Koizumi, T. Sakai, Taiga Shimizu, Taiki Ono, M. Wanner, T. Takyu, Toshihiko Tanaka, Yoichiro Sogame
The resting cyst is one of the quietest life stages (i.e. cryptobiosis) with hardly measurable or even ceased metabolic activity. However, are the resting cysts just resting? Here, to our knowledge, we report for the first time radiation hormesis in resting cysts. In the present study, we focused on the proliferative capability of excysted cells from 500–4000 Gy-gamma-irradiated Colpoda cucullus resting cysts by a bioassay method. Generally, excysted cells from irradiated cysts lose their proliferative capability. However, we observed an increased proliferative capability promoted by low doses of irradiation. Cells, which had excysted from 500-Gy-irradiated cysts, restored their proliferation capability with a recovery period of 12 h and 24 h before excysting. Additionally, cells, which had excysted from 500-4000-Gy irradiated cysts, recovered proliferative capability by re-forming resting cysts. Here, the proliferative capability of excysted cells from 500-Gy-irradiated cysts was even higher than that of non-irradiated.
{"title":"Recovery of proliferative capability in gamma irradiated Colpoda cucullus (ciliated protist) resting cysts and its radiation hormesis","authors":"R. Saito, R. Koizumi, T. Sakai, Taiga Shimizu, Taiki Ono, M. Wanner, T. Takyu, Toshihiko Tanaka, Yoichiro Sogame","doi":"10.21685/1680-0826-2020-14-3-5","DOIUrl":"https://doi.org/10.21685/1680-0826-2020-14-3-5","url":null,"abstract":"The resting cyst is one of the quietest life stages (i.e. cryptobiosis) with hardly measurable or even ceased metabolic activity. However, are the resting cysts just resting? Here, to our knowledge, we report for the first time radiation hormesis in resting cysts. In the present study, we focused on the proliferative capability of excysted cells from 500–4000 Gy-gamma-irradiated Colpoda cucullus resting cysts by a bioassay method. Generally, excysted cells from irradiated cysts lose their proliferative capability. However, we observed an increased proliferative capability promoted by low doses of irradiation. Cells, which had excysted from 500-Gy-irradiated cysts, restored their proliferation capability with a recovery period of 12 h and 24 h before excysting. Additionally, cells, which had excysted from 500-4000-Gy irradiated cysts, recovered proliferative capability by re-forming resting cysts. Here, the proliferative capability of excysted cells from 500-Gy-irradiated cysts was even higher than that of non-irradiated.","PeriodicalId":37502,"journal":{"name":"Protistology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67887949","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.21685/1680-0826-2020-14-4-1
A. Smirnov, Nikita S. Kulishkin, A. A. Surkova, Y. Mesentsev, N. Bondarenko, E. Nassonova, Y. Mazei
remarkable
非凡的
{"title":"Molecular phylogeny of Paradermamoeba valamo (Amoebozoa, Discosea, Dermamoebida)","authors":"A. Smirnov, Nikita S. Kulishkin, A. A. Surkova, Y. Mesentsev, N. Bondarenko, E. Nassonova, Y. Mazei","doi":"10.21685/1680-0826-2020-14-4-1","DOIUrl":"https://doi.org/10.21685/1680-0826-2020-14-4-1","url":null,"abstract":"remarkable","PeriodicalId":37502,"journal":{"name":"Protistology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67888151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.21685/1680-0826-2020-14-3-1
I. Telesh, A. Khanaychenko, S. Skarlato
Summary The article compares ecological requirements of the potentially toxic bloom-forming dinoflagellates Prorocentrum cordatum and their grazers, the neritic calanoid copepods Acartia tonsa in the Baltic and Black seas. A preliminary analysis of the ecological niche characteristics of these two common invasive species allowed assuming the partial juxtaposition of their niches and speculating on the perspectives of this phenomenon for the invasion success and putative top-down control of harmful algal blooms in marine coastal ecosystems.
{"title":"The interplay of two invaders: can blooms of the potentially toxic dinoflagellates Prorocentrum cordatum be downregulated by the neritic copepods Acartia tonsa?","authors":"I. Telesh, A. Khanaychenko, S. Skarlato","doi":"10.21685/1680-0826-2020-14-3-1","DOIUrl":"https://doi.org/10.21685/1680-0826-2020-14-3-1","url":null,"abstract":"Summary The article compares ecological requirements of the potentially toxic bloom-forming dinoflagellates Prorocentrum cordatum and their grazers, the neritic calanoid copepods Acartia tonsa in the Baltic and Black seas. A preliminary analysis of the ecological niche characteristics of these two common invasive species allowed assuming the partial juxtaposition of their niches and speculating on the perspectives of this phenomenon for the invasion success and putative top-down control of harmful algal blooms in marine coastal ecosystems.","PeriodicalId":37502,"journal":{"name":"Protistology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67887882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.21685/1680-0826-2020-14-4-7
S. Karpov, G. Paskerova
Summary In this discussion, we are clarifying the interface between the aphelid trophont and the host in different life cycle stages from the invasion until zoospore maturation. As a result, we consider that the aphelid trophont does not consume host cytoplasm from outside, as it has been suggested earlier, but from inside, i
{"title":"The aphelids, intracellular parasitoids of algae, consume the host cytoplasm “from the inside”","authors":"S. Karpov, G. Paskerova","doi":"10.21685/1680-0826-2020-14-4-7","DOIUrl":"https://doi.org/10.21685/1680-0826-2020-14-4-7","url":null,"abstract":"Summary In this discussion, we are clarifying the interface between the aphelid trophont and the host in different life cycle stages from the invasion until zoospore maturation. As a result, we consider that the aphelid trophont does not consume host cytoplasm from outside, as it has been suggested earlier, but from inside, i","PeriodicalId":37502,"journal":{"name":"Protistology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67888779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.21685/1680-0826-2020-14-4-4
Dmitry G. Zagumyonnyi, K. Prokina, D. Tikhonenkov
{"title":"First findings of сentrohelid heliozoans (Haptista: Centroplasthelida) from marine and freshwater environments of South Korea","authors":"Dmitry G. Zagumyonnyi, K. Prokina, D. Tikhonenkov","doi":"10.21685/1680-0826-2020-14-4-4","DOIUrl":"https://doi.org/10.21685/1680-0826-2020-14-4-4","url":null,"abstract":"","PeriodicalId":37502,"journal":{"name":"Protistology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67888936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.21685/1680-0826-2019-13-3-3
I. Alekperov, E. Tahirova
Samples of plankton, periphyton, benthos and phytocyliocenoses (coastal thickets of aquatic plants with associated ciliates) were collected during 2010–2017 from 7 collection points (from north to south) along the Azerbaijan sector of the Caspian Sea coastal zone. In total, 463 species of free-living ciliates were found. The highest number of ciliate species was noted in the Divichi firth (214) and on the Absheron coast (203). The species composition in Nabran (179 species) and on the coast of Lankaran (107) and Astara (110) was much lower. Minimal species diversity was observed in the Kyzyl-Agach Bay (96) and estuary of the Kura River (72). The similarity of the freeliving ciliate species composition of the seven stationary points along the Azerbaijan sector of the Caspian Sea depends on the similarity of environmental conditions at these collection points, as well as on a certain distance between them. Species diversity in different biotopes of each of the seven stationary collection points showed that, despite the strong differences in the total number of the ciliate species found therein, approximately the same ratio of species diversity in various biotopes is characteristic for all collection points. It was established that in plankton communities there are from 9% to 16% of the total number of ciliate species, in periphyton – from 10% to 25%, in benthos from 30% to 40%, and in phytocyliocenoses communities – from 33% to 44%. The obtained data indicate a general pattern of the distribution of ciliate species richness among different biotopes, even considering the presence of many ciliate species simultaneously in several habitats.
{"title":"Free-living ciliates in different coastal zone biotopes at the Azerbaijan sector of the Caspian Sea","authors":"I. Alekperov, E. Tahirova","doi":"10.21685/1680-0826-2019-13-3-3","DOIUrl":"https://doi.org/10.21685/1680-0826-2019-13-3-3","url":null,"abstract":"Samples of plankton, periphyton, benthos and phytocyliocenoses (coastal thickets of aquatic plants with associated ciliates) were collected during 2010–2017 from 7 collection points (from north to south) along the Azerbaijan sector of the Caspian Sea coastal zone. In total, 463 species of free-living ciliates were found. The highest number of ciliate species was noted in the Divichi firth (214) and on the Absheron coast (203). The species composition in Nabran (179 species) and on the coast of Lankaran (107) and Astara (110) was much lower. Minimal species diversity was observed in the Kyzyl-Agach Bay (96) and estuary of the Kura River (72). The similarity of the freeliving ciliate species composition of the seven stationary points along the Azerbaijan sector of the Caspian Sea depends on the similarity of environmental conditions at these collection points, as well as on a certain distance between them. Species diversity in different biotopes of each of the seven stationary collection points showed that, despite the strong differences in the total number of the ciliate species found therein, approximately the same ratio of species diversity in various biotopes is characteristic for all collection points. It was established that in plankton communities there are from 9% to 16% of the total number of ciliate species, in periphyton – from 10% to 25%, in benthos from 30% to 40%, and in phytocyliocenoses communities – from 33% to 44%. The obtained data indicate a general pattern of the distribution of ciliate species richness among different biotopes, even considering the presence of many ciliate species simultaneously in several habitats.","PeriodicalId":37502,"journal":{"name":"Protistology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67887640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.21685/1680-0826-2019-13-4-7
S. Fokin
Recently, on October 29, 2019, we celebrated the 160th anniversary of the great Russian protistologist – Wladimir Timopheyevich Schewiakoff (Fokin, 2000; Groeben and Fokin, 2013; Fokin and Zavoiskaya, 2016a, 2016b; Fokin, 2019), who is known in the International scientific community as a world-beloved specialist in ciliated protists (Ciliophora) and, simultaneously, in very specific marine planktonic unicellular organisms related to Radiolaria – Achantaria (Schewiakoff, 1889b, 1896, 1902, 1926)1. Working on the live acantharians in the Mediterranean Sea (Naples, Italy) and considering additional criteria of their cells, Prof. W.T. Schewiakoff emended the classification of the group in 1926 and set up the main taxonomic framework
最近，在2019年10月29日，我们庆祝了伟大的俄罗斯古生物学家弗拉基米尔·季莫菲耶维奇·舍维亚科夫诞辰160周年(福金，2000;Groeben and Fokin, 2013;Fokin and Zavoiskaya, 2016a, 2016b;Fokin, 2019)，他在国际科学界是世界知名的纤毛原生生物(纤毛虫)专家，同时也是与放射菌有关的非常具体的海洋浮游单细胞生物(Schewiakoff, 1889b, 1896, 1902, 1926)1。W.T. Schewiakoff教授研究了地中海(意大利那不勒斯)的活棘头虫，并考虑了其细胞的附加标准，于1926年修订了该群体的分类，并建立了主要的分类框架
{"title":"Protistologist Wladimir Timopheyevich Schewiakoff (1859–1930). On the shores of the Gulf of Naples","authors":"S. Fokin","doi":"10.21685/1680-0826-2019-13-4-7","DOIUrl":"https://doi.org/10.21685/1680-0826-2019-13-4-7","url":null,"abstract":"Recently, on October 29, 2019, we celebrated the 160th anniversary of the great Russian protistologist – Wladimir Timopheyevich Schewiakoff (Fokin, 2000; Groeben and Fokin, 2013; Fokin and Zavoiskaya, 2016a, 2016b; Fokin, 2019), who is known in the International scientific community as a world-beloved specialist in ciliated protists (Ciliophora) and, simultaneously, in very specific marine planktonic unicellular organisms related to Radiolaria – Achantaria (Schewiakoff, 1889b, 1896, 1902, 1926)1. Working on the live acantharians in the Mediterranean Sea (Naples, Italy) and considering additional criteria of their cells, Prof. W.T. Schewiakoff emended the classification of the group in 1926 and set up the main taxonomic framework","PeriodicalId":37502,"journal":{"name":"Protistology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67887804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.21685/1680-0826-2019-13-4-2
Victoria S. Tcvetkova, N. Zorina, Maria A. Mamkaeva, S. Karpov
Aphelids (Aphelida) are poorly known parasitoids of algae that have raised considerable interest because of their phylogenetic position as phagotrophic protists sister to Fungi. Together with Rozellida and Microsporidia they have been classified in the Opisthosporidia but seem to be more closely related to the Fungi rather than to the Cryptomycota and Microsporidia, the other members of the Opisthosporidia. Molecular environmental studies have revealed high genetic diversity within the aphelids, but only four genera have been described: Aphelidium, Amoeboaphelidium, Paraphelidium and Pseudaphelidium. Here, we describe the life cycle of a new species of Aphelidium, Aph. arduennense. Molecular phylogenetic analysis of its 18S rRNA indicates that Aph. arduennense is sister to Aph. tribonematis, and together with Aph. melosirae they form a monophyletic cluster. Within the aphelids, this cluster is distantly related to Paraphelidium and Amoeboaphelidium.
{"title":"Molecular phylogeny of Aphelidium arduennense sp. nov. – new representative of Aphelida (Opisthosporidia)","authors":"Victoria S. Tcvetkova, N. Zorina, Maria A. Mamkaeva, S. Karpov","doi":"10.21685/1680-0826-2019-13-4-2","DOIUrl":"https://doi.org/10.21685/1680-0826-2019-13-4-2","url":null,"abstract":"Aphelids (Aphelida) are poorly known parasitoids of algae that have raised considerable interest because of their phylogenetic position as phagotrophic protists sister to Fungi. Together with Rozellida and Microsporidia they have been classified in the Opisthosporidia but seem to be more closely related to the Fungi rather than to the Cryptomycota and Microsporidia, the other members of the Opisthosporidia. Molecular environmental studies have revealed high genetic diversity within the aphelids, but only four genera have been described: Aphelidium, Amoeboaphelidium, Paraphelidium and Pseudaphelidium. Here, we describe the life cycle of a new species of Aphelidium, Aph. arduennense. Molecular phylogenetic analysis of its 18S rRNA indicates that Aph. arduennense is sister to Aph. tribonematis, and together with Aph. melosirae they form a monophyletic cluster. Within the aphelids, this cluster is distantly related to Paraphelidium and Amoeboaphelidium.","PeriodicalId":37502,"journal":{"name":"Protistology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67887844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.21685/1680-0826-2019-13-1-3
Mariya Ostroukhova, E. Ermilova
{"title":"New insights into NO generation and AOX1 upregulation in Chlamydomonas","authors":"Mariya Ostroukhova, E. Ermilova","doi":"10.21685/1680-0826-2019-13-1-3","DOIUrl":"https://doi.org/10.21685/1680-0826-2019-13-1-3","url":null,"abstract":"","PeriodicalId":37502,"journal":{"name":"Protistology","volume":"132 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67885640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.21685/1680-0826-2019-13-1-4
O. Kamyshatskaya, Y. Mesentsev, L. Chistyakova, A. Smirnov
We isolated the species Polychaos annulatum (Penard, 1902) Smirnov et Goodkov, 1998 from a freshwater habitat in the surrounding of Saint-Petersburg. The previous re-isolation of this species took place in 1998; at that time the studies of its lightmicroscopic morphology were limited with the phase contrast optics, and the electronmicroscopic data were obtained using the traditional glutaraldehyde fixation, preceded with prefixation and followed by postfixation with osmium tetroxide. In the present paper, we provide modern DIC images of P. annulatum. Using the fixation protocol that includes a mixture of the glutaraldehyde and paraformaldehyde we were able to obtain better fixation quality for this species. We provide some novel details of its locomotive morphology, nuclear morphology, and ultrastructure. The present finding evidence that P. annulatum is a widely distributed species that could be isolated from a variety of freshwater habitats.
Smirnov et Goodkov, 1998，从圣彼得堡附近的一个淡水栖息地分离出了Polychaos annulatum (Penard, 1902)。该物种的上一次重新隔离发生在1998年;当时对其光显微形态的研究仅限于相对比光学，电子显微数据采用传统的戊二醛固定，前固定，后固定四氧化锇。在本论文中，我们提供了现代DIC图像的环状叶。使用包括戊二醛和多聚甲醛混合物的固定方案，我们能够对该物种获得更好的固定质量。我们提供了一些新的细节机车形态，核形态和超微结构。本研究结果表明，环纹藻是一种分布广泛的物种，可以从各种淡水生境中分离出来。
{"title":"Light-microscopic morphology and ultrastructure of Polychaos annulatum (Penard, 1902) Smirnov et Goodkov, 1998 (Amoebozoa, Tubulinea, Euamoebida), re-isolated from the surroundings of St. Petersburg (Russia)","authors":"O. Kamyshatskaya, Y. Mesentsev, L. Chistyakova, A. Smirnov","doi":"10.21685/1680-0826-2019-13-1-4","DOIUrl":"https://doi.org/10.21685/1680-0826-2019-13-1-4","url":null,"abstract":"We isolated the species Polychaos annulatum (Penard, 1902) Smirnov et Goodkov, 1998 from a freshwater habitat in the surrounding of Saint-Petersburg. The previous re-isolation of this species took place in 1998; at that time the studies of its lightmicroscopic morphology were limited with the phase contrast optics, and the electronmicroscopic data were obtained using the traditional glutaraldehyde fixation, preceded with prefixation and followed by postfixation with osmium tetroxide. In the present paper, we provide modern DIC images of P. annulatum. Using the fixation protocol that includes a mixture of the glutaraldehyde and paraformaldehyde we were able to obtain better fixation quality for this species. We provide some novel details of its locomotive morphology, nuclear morphology, and ultrastructure. The present finding evidence that P. annulatum is a widely distributed species that could be isolated from a variety of freshwater habitats.","PeriodicalId":37502,"journal":{"name":"Protistology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67885865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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