Protist最新文献_第6页

25 years of Protist: A thank you to Editor-in-Chief Michael Melkonian 《原生》25年:感谢主编Michael Melkonian

IF 2.5 3区生物学

Protist Pub Date : 2023-04-01 DOI: 10.1016/j.protis.2023.125947

R. Ellen R. Nisbet , Christopher J. Howe

引用次数: 0

Prevalence and Subtype Distribution of Blastocystis in Tibetan Sheep in Qinghai Province, Northwestern China 青海省藏羊囊虫病流行及亚型分布

IF 2.5 3区生物学

Protist Pub Date : 2023-04-01 DOI: 10.1016/j.protis.2023.125948

Fan Yang , Jing-min Gou , Bing-ke Yang , Jia-yue Du , Hui-zhong Yao , Mei Ren , Qing Lin

{"title":"Prevalence and Subtype Distribution of Blastocystis in Tibetan Sheep in Qinghai Province, Northwestern China","authors":"Fan Yang , Jing-min Gou , Bing-ke Yang , Jia-yue Du , Hui-zhong Yao , Mei Ren , Qing Lin","doi":"10.1016/j.protis.2023.125948","DOIUrl":"10.1016/j.protis.2023.125948","url":null,"abstract":"<div>Blastocystis is one of the most common intestinal protists in humans and a great number of animals, including sheep and goats. High prevalence and multiple subtypes of Blastocystis have been reported in sheep in several regions of China and elsewhere. However, there is a dearth of knowledge about Blastocystis in Tibetan sheep. A total of 761 fecal samples were collected from Tibetan sheep in seven counties of Qinghai Province, northwestern China, and were examined for the prevalence and subtypes of Blastocystis using molecular technology based on the partial small subunit ribosomal RNA gene of Blastocystis. The overall prevalence of Blastocystis in the investigated Tibetan sheep was 7.5% (57/761) using PCR and DNA Sanger sequencing, and differences in prevalence were observed among the ruminants from the seven counties (P < 0.01), and across four seasons (P < 0.01). Sequence analysis revealed five subtypes (ST14 (57.9%), ST10 (26.3%), ST12 (5.3%), ST21 (5.3%), and ST30 (5.3%)) of Blastocystis sp. in these Tibetan sheep, with ST14 as the predominant subtype. To our knowledge, this is the first report of Blastocystis colonization in Tibetan sheep.</div>","PeriodicalId":20781,"journal":{"name":"Protist","volume":"174 2","pages":"Article 125948"},"PeriodicalIF":2.5,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9627175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Effect of pH and Salinity on the Toxicity and Growth of the Golden Alga, Prymnesium parvum pH和盐度对金藻毒力和生长的影响

IF 2.5 3区生物学

Protist Pub Date : 2023-02-01 DOI: 10.1016/j.protis.2022.125927

David A. Caron , Alle A.Y. Lie , Tom Buckowski , Jim Turner , Kevin Frabotta

引用次数: 0

Introduction to the Special Issue: Bland J. Finlay: Uncovering the Unseen World of Microbes 特刊简介：布兰德·J·芬莱：揭开微生物的隐秘世界

IF 2.5 3区生物学

Protist Pub Date : 2023-02-01 DOI: 10.1016/j.protis.2022.125926

Genoveva F. Esteban, Stephen C. Maberly

引用次数: 0

Protist Diversity Responses to Experimental N Deposition in Biological Crusts of a Semiarid Mediterranean Ecosystem 地中海半干旱生态系统生物结皮中原生生物多样性对实验N沉降的响应

IF 2.5 3区生物学

Protist Pub Date : 2023-02-01 DOI: 10.1016/j.protis.2022.125929

Blanca Pérez-Uz , Virginia C. Galfione , Raul Ochoa-Hueso , Mercedes Martín-Cereceda

{"title":"Protist Diversity Responses to Experimental N Deposition in Biological Crusts of a Semiarid Mediterranean Ecosystem","authors":"Blanca Pérez-Uz , Virginia C. Galfione , Raul Ochoa-Hueso , Mercedes Martín-Cereceda","doi":"10.1016/j.protis.2022.125929","DOIUrl":"10.1016/j.protis.2022.125929","url":null,"abstract":"<div>Biological soil crusts (BSC) are associations of different macro and microorganisms and aggregated soil particles located on the surface of soils in many different habitats. BSC harbour a diverse and complex community of ciliates and testate amoebae. These phagotrophic protists play an important role in C and N recycling in soil ecosystems but have not been frequently studied in BSC. In this context, the effects of three increasing N inputs on ciliates and testate amoebae in crusts from a semi-arid Mediterranean ecosystem were evaluated. A field experiment with artificial N-deposition was designed to mimic the effects caused by anthropogenic N depositions. The results have shown that the protist populations of these semi-arid Mediterranean environments have lower species richness than other soil environments. The increase in N produces a net loss of diversity in the populations studied and shifts in the community structure. It has also been shown that some ciliates and testate amoebae, due to their population responses to increased N concentrations, could potentially be used as bio-indicators of N contamination in these BSCs.</div>","PeriodicalId":20781,"journal":{"name":"Protist","volume":"174 1","pages":"Article 125929"},"PeriodicalIF":2.5,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9411431","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of Glacial Flour on Marine Micro-plankton: Evidences from Natural Communities of Greenlandic Fjords and Experimental Studies 冰粉对海洋浮游生物的影响:来自格陵兰峡湾自然群落的证据和实验研究

IF 2.5 3区生物学

Protist Pub Date : 2023-02-01 DOI: 10.1016/j.protis.2022.125928

Maira Maselli , Lorenz Meire , Patrick Meire , Per Juel Hansen

{"title":"Effects of Glacial Flour on Marine Micro-plankton: Evidences from Natural Communities of Greenlandic Fjords and Experimental Studies","authors":"Maira Maselli , Lorenz Meire , Patrick Meire , Per Juel Hansen","doi":"10.1016/j.protis.2022.125928","DOIUrl":"10.1016/j.protis.2022.125928","url":null,"abstract":"<div>Meltwater runoff from glaciers carries particles, so-called glacial flour that may affect planktonic organisms and the functioning of marine ecosystems. Protist microplankton is at the base of marine food webs and thus plays an important role in sustaining important ecosystem services. To assess the effect of glacial flour on photoautotrophic, heterotrophic and mixotrophic microplankton, the spatial distribution of these trophic groups was studied in four Greenlandic fjords during summer. The results suggest that the abundance of the autotrophic microplankton was affected by the glacier meltwater due to reduced light penetration and nutrient availability. The abundance of heterotrophic and mixotrophic microplankton were not apparently affected by the glacier meltwater. Incubation experiments were conducted on the natural population and in laboratory cultures of two mixoplanktonic ciliate species. The experiments on the natural population revealed that none of the trophic groups were affected by the suspended material at concentrations up to 50 mg L−1. The experiments on cultures gave no indication that glacial flour was ingested by the mixoplanktonic ciliates. Growth rates of cultured ciliates were not affected by the glacial flour addition. These results suggest that heterotrophic and mixotrophic microplankton are not affected by glacial flour as much as autotrophic microplankton.</div>","PeriodicalId":20781,"journal":{"name":"Protist","volume":"174 1","pages":"Article 125928"},"PeriodicalIF":2.5,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9723706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

The Extraordinarily Rare Ciliate Legendrea loyezae Fauré-Fremiet, 1908 (Haptoria, Ciliophora) 极其罕见的纤毛虫Legendrea loyezae faur<s:1> - fremiet, 1908(纤毛虫目)

IF 2.5 3区生物学

Protist Pub Date : 2022-12-01 DOI: 10.1016/j.protis.2022.125912

James Weiss , Demetra Andreou , Genoveva F. Esteban

{"title":"The Extraordinarily Rare Ciliate Legendrea loyezae Fauré-Fremiet, 1908 (Haptoria, Ciliophora)","authors":"James Weiss , Demetra Andreou , Genoveva F. Esteban","doi":"10.1016/j.protis.2022.125912","DOIUrl":"10.1016/j.protis.2022.125912","url":null,"abstract":"<div>Diverse and dynamic communities of ciliates and other microbes thrive in the natural environment, driving the functioning of aquatic ecosystems. Many microbes are present in very low numbers or are dormant in the ‘seedbank’, escaping detection in environmental surveys and, consequently, remaining underexplored. Here, we report an extraordinarily rare ciliate that was discovered after persistent exploration of freshwater anoxic sediments - Legendrea loyezae Fauré-Fremiet, 1908, a member of the Family Spathidiidae, Order Haptorida. In this study, we present the sixth account of the ciliate since 1908 and reveal its phylogenetic position with the first 18S rRNA data for the genus. We explain the key morphological features of the species, describing a remarkable behaviour in which the ciliate “shapeshifts'' due to its ability of controlled full extension and retraction of its tube-like tentacles. Our results shed light on the similarity of L. loyezae to another ciliate that was first described as Legendrea bellerophon, later moved under a new genus and named Thysanomorpha bellerophon. We question the validity of this taxonomic decision and, based on morphological characters and tentacle movement, we propose moving T. bellerophon back under Legendrea. This study demonstrates how continued and persistent exploration of natural habitats lead to the discovery of microbial communities and species.</div>","PeriodicalId":20781,"journal":{"name":"Protist","volume":"173 6","pages":"Article 125912"},"PeriodicalIF":2.5,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1434461022000578/pdfft?md5=1087f5f4243f46e37d2598674145c135&pid=1-s2.0-S1434461022000578-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10448044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Seasonal Patterns of Phytoplankton Taxon Richness in Lakes: Effects of Temperature, Turnover and Abundance 湖泊浮游植物分类群丰富度的季节格局:温度、周转量和丰度的影响

IF 2.5 3区生物学

Protist Pub Date : 2022-12-01 DOI: 10.1016/j.protis.2022.125925

Stephen C. Maberly , Anne Chao , Bland J. Finlay

{"title":"Seasonal Patterns of Phytoplankton Taxon Richness in Lakes: Effects of Temperature, Turnover and Abundance","authors":"Stephen C. Maberly , Anne Chao , Bland J. Finlay","doi":"10.1016/j.protis.2022.125925","DOIUrl":"10.1016/j.protis.2022.125925","url":null,"abstract":"<div>Species richness is a key ecological characteristic that influences numerous ecosystem functions. Here we analyse the patterns and possible causes of phytoplankton taxon richness in seasonal datasets from twenty contrasting lakes in the English Lake District over six years and near-weekly datasets over 33 years from Windermere. Taxon richness was lowest in winter and highest in summer or autumn in all of the lakes. Observed richness was very similar to richness estimated from coverage and sampling effort, implying that it closely reflected true seasonal patterns. Summer populations were dominated by Chlorophyta and functional groups X1, F, N and P (sensu Reynolds). In Windermere, weekly taxon richness was strongly positively correlated with surface water temperature, as was the number of functional groups and the number of taxa per functional group. Turnover in richness of taxa and functional groups were positively correlated and both were related to surface temperature. This suggests that high taxon richness in summer is linked to higher water temperature, promoting a turnover in richness of taxa and functional groups in these lakes. However, since the number of taxa per unit concentration of chlorophyll a decreased with increasing concentration of chlorophyll a, competition might occur when abundance is high.</div>","PeriodicalId":20781,"journal":{"name":"Protist","volume":"173 6","pages":"Article 125925"},"PeriodicalIF":2.5,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1434461022000700/pdfft?md5=5a903e2a4160eda54e94ea932c611e85&pid=1-s2.0-S1434461022000700-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10504941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Some Personal Memories of Bland J. Finlay and Work on Protists in “Priest Pot“ 布兰德·J·芬莱的一些个人记忆与《牧师壶》中的主人公作品

IF 2.5 3区生物学

Protist Pub Date : 2022-12-01 DOI: 10.1016/j.protis.2022.125910

Ulrike-G. Berninger

引用次数: 0

Testate Amoebae in Historical parks of Potsdam, Germany 德国波茨坦历史公园里的变形虫

IF 2.5 3区生物学

Protist Pub Date : 2022-12-01 DOI: 10.1016/j.protis.2022.125911

Anatoly Bobrov , Sebastian Wetterich , Lutz Schirrmeister

{"title":"Testate Amoebae in Historical parks of Potsdam, Germany","authors":"Anatoly Bobrov , Sebastian Wetterich , Lutz Schirrmeister","doi":"10.1016/j.protis.2022.125911","DOIUrl":"10.1016/j.protis.2022.125911","url":null,"abstract":"<div>To explore the potential of urban settings as habitats for testate amoebae, five historical parks in Potsdam (Germany) were sampled at different sites. A total of 32 sampling sites was chosen in proximity to deciduous (Acer, Castanea, Fagus, Tilia, Platanus, Quercus) and coniferous (Fraxinus, Picea, Pinus, Tsuga) trees. Meadows and creeks were also sampled. The overall taxonomic record comprises 76 species and sub-species. High species numbers of >20 per sample were found in meadows and below Fagus, Tilia, and Quercus trees. The species richness per park ranges from 33 to 46 taxa. Most species belong to the eurybiontic ecological group, although litter-inhabiting and hygrophilic and hydrophilic species were also present. Common species found in more than 50% of all samples (superdominants) belong to the genera Centropyxis, Cyclopyxis, Euglypha, and Trinema. Interestingly, the rare Frenopyxis stierlitzi which inhabits tree hollows was found as a recently described species in a new genus Frenopyxis Bobrov & Mazei 2020 in the Babelsberg Park. The studied testate amoebae are characterized by a high degree of morphological and morphometric plasticity. Therefore, the study of testate amoebae in urban settings will reveal new insights into their ecology and enhance the definition of morphometric variability for single species.</div>","PeriodicalId":20781,"journal":{"name":"Protist","volume":"173 6","pages":"Article 125911"},"PeriodicalIF":2.5,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1434461022000566/pdfft?md5=17f72b01d0bf8c49f85812ea2966de96&pid=1-s2.0-S1434461022000566-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10447520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1