Acta Protozoologica最新文献_第10页

Evidence supporting the concept of a regionalized distribution of testate amoebae in the Arctic 支持北极地区遗存变形虫区域化分布概念的证据

IF 0.5 4区生物学

Acta Protozoologica Pub Date : 2016-12-19 DOI: 10.4467/16890027AP.16.019.6006

L. Beyens, A. Bobrov

引用次数: 11

Ultrastructure and Phylogeny of Pleistophora beebei sp. nov. (Microsporidia) Infecting the Amazonian Teleostean Brachyhypopomus beebei (fam. Hypopomidae) 侵染亚马逊网骨鱼的beebepleistophora sp. 11 . (Microsporidia)的超微结构和系统发育。Hypopomidae)

IF 0.5 4区生物学

Acta Protozoologica Pub Date : 2016-12-19 DOI: 10.4467/16890027AP.16.022.6009

G. Casal, E. Matos, S. Rocha, José Ledamir Sindeaux Neto, S. Al-Quraishy, C. Azevedo

{"title":"Ultrastructure and Phylogeny of Pleistophora beebei sp. nov. (Microsporidia) Infecting the Amazonian Teleostean Brachyhypopomus beebei (fam. Hypopomidae)","authors":"G. Casal, E. Matos, S. Rocha, José Ledamir Sindeaux Neto, S. Al-Quraishy, C. Azevedo","doi":"10.4467/16890027AP.16.022.6009","DOIUrl":"https://doi.org/10.4467/16890027AP.16.022.6009","url":null,"abstract":"A new microsporidian, Pleistophora beebei sp. nov., parasitizing the freshwater benthopelagic teleostean fish Brachyhypopomus beebei Schultz, 1944 (fam. Hypopomidae) collected from the Amazon River is described based on molecular and morphological studies. The parasite develops in the skeletal muscle of the abdominal cavity, forming a whitish cyst-like containing several groups of two types of spores (macrospores and microspores), which were observed in close contact with the myofibrils. Small groups of macrospores (ovoid elongate, tapering more anteriorly than posteriorly and measuring about 7.8 ± 0.4 × 4.7 ± 0.2 µm) were observed among the numerous microspores (lightly pyriform to ellipsoidal with rounded ends, measured about 4.7 ± 0.3 × 2.8 ± 0.4 µm). Both types of spores possessed a single large posterior vacuole containing flocculent material. The ultrastructural aspects observed, together with the formation of a cyst-like, suggest that the parasite belongs to the genus Pleistophora. This taxonomic positioning was confirmed by the molecular analysis of the SSU rRNA gene and Maximum-likelihood (ML) inference. Comparison to similar species previously described, recognized this as a new species, herein named Pleistophora beebei sp. nov.","PeriodicalId":50883,"journal":{"name":"Acta Protozoologica","volume":"2016 1","pages":"259-268"},"PeriodicalIF":0.5,"publicationDate":"2016-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70977850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 2

A New Soil Ciliate, Birojimia soyaensis nov. spec. (Ciliophora: Urostylida)from South Korea 韩国土壤纤毛虫一新种，Birojimia soyaensis 11 . spec.(纤毛虫目:尾虫纲)

IF 0.5 4区生物学

Acta Protozoologica Pub Date : 2016-11-28 DOI: 10.4467/16890027AP.16.013.5745

Kang-San Kim, Jae‐Ho Jung, G. Min

{"title":"A New Soil Ciliate, Birojimia soyaensis nov. spec. (Ciliophora: Urostylida)from South Korea","authors":"Kang-San Kim, Jae‐Ho Jung, G. Min","doi":"10.4467/16890027AP.16.013.5745","DOIUrl":"https://doi.org/10.4467/16890027AP.16.013.5745","url":null,"abstract":"A new soil urostylid ciliate, Birojimia soyaensis nov. spec. was discovered from Soya Island, Incheon, South Korea. The species is described based on live and stained specimen observations, and 18S ribosomal RNA gene sequence analysis. Birojimia soyaensis nov. spec. is characterized by the following features: body slender, elongate, and somewhat twisted; body size in vivo 170–200 μm × 40–50 μm; contractile vacuole located at middle of left cell margin; cortical granules present; 37–48 adoral membranelles; 3 frontal and 2 frontoterminal cirri present; III/2 and buccal cirrus present; midventral pairs only; pretransverse ventral and transverse cirri present; 1 left and 4 right marginal rows, including 3 compound rows; 5 long dorsal kineties with 3 additional shortened kineties in anteriorly compound rows; 8–11 caudal cirri; 53–69 macronuclear nodules; and 2 or 3 micronuclei. Birojimia soyaensis nov. spec. is distinguished from B. terricola by cortical granule size (0.4–1.2 μm in diameter vs. 2–3 μm × 1–2 μm), cortical granule shape (mostly spherical vs. broadly ellipsoid to lenticular, respectively); number of caudal cirri (8–11 vs. 2–7), and number of dorsal bristle rows (8 vs. 6–7). Phylogenetic analysis suggests this new species is most closely related to the genus Hemicycliostyla.","PeriodicalId":50883,"journal":{"name":"Acta Protozoologica","volume":"2016 1","pages":"135-144"},"PeriodicalIF":0.5,"publicationDate":"2016-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70977825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 2

Winter abundances of naked amoebae in the soil system of the invasive species Japanese knotweed (Fallopia japonica) with comparative data from adjacent sites 入侵种日本结缕草(Fallopia japonica)土壤系统中冬季裸变形虫的丰度与邻近站点的比较

IF 0.5 4区生物学

Acta Protozoologica Pub Date : 2016-11-28 DOI: 10.4467/16890027AP.16.015.5747

P. Bischoff, Kaitlynn Connington

{"title":"Winter abundances of naked amoebae in the soil system of the invasive species Japanese knotweed (Fallopia japonica) with comparative data from adjacent sites","authors":"P. Bischoff, Kaitlynn Connington","doi":"10.4467/16890027AP.16.015.5747","DOIUrl":"https://doi.org/10.4467/16890027AP.16.015.5747","url":null,"abstract":"Among the most prolific invasive plant species posing threats to the ecological balance of ecosystems in North America and Europe is Japanese knotweed (Fallopia japonica). In order to identify the potential role of protists in the invasive capacity of Japanese knotweed the winter abundances of naked amoebae in soils from three roadside thickets of Japanese knotweed were compared to nearby non-invaded sites. Japanese knotweed soils had higher abundances (t = 5.43, df, 16, p < 0.001) of amoebae than comparison sites. This is one of the first studies to document higher abundances of soil naked amoebae associated with an invasive plant, and may indicate more generally that below-ground abundances of amoebae can promote soil fertility and support the successful adaptation and expansion of some invasive plant species. Moreover, analysis of encysted vs. trophic forms of naked amoebae in the winter soil, provided evidence of freezeresistant, amoeba resting cells in soil samples from the natural environment in support of prior findings that were based solely on laboratory experimental evidence. Overall, high densities of naked amoebae in the winter soils of Japanese knotweed, some as resting cells capable of forming rapidly activated trophic stages, likely increase soil fertility and strengthen the species’ invasive capacity.","PeriodicalId":50883,"journal":{"name":"Acta Protozoologica","volume":"2016 1","pages":"155-160"},"PeriodicalIF":0.5,"publicationDate":"2016-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70977894","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 6

Microbial respiration of organic carbon in freshwater microcosms: the potential for improved estimation of microbial CO2 emission from organically enriched freshwater ecosystems 淡水微生态系统中有机碳的微生物呼吸作用:从富含有机的淡水生态系统中改进微生物二氧化碳排放估算的潜力

IF 0.5 4区生物学

Acta Protozoologica Pub Date : 2016-11-28 DOI: 10.4467/16890027AP.16.018.5750

O. Anderson

引用次数: 2

Interaction of ciliate communities with cyanobacterial water bloom in a shallow, hypertrophic reservoir 在一个浅的、肥厚的水库中，纤毛虫群落与蓝藻水华的相互作用

IF 0.5 4区生物学

Acta Protozoologica Pub Date : 2016-11-28 DOI: 10.4467/16890027AP.16.017.5749

E. Tirjaková, K. Krajčovičová, M. Illyová, P. Vďačný

{"title":"Interaction of ciliate communities with cyanobacterial water bloom in a shallow, hypertrophic reservoir","authors":"E. Tirjaková, K. Krajčovičová, M. Illyová, P. Vďačný","doi":"10.4467/16890027AP.16.017.5749","DOIUrl":"https://doi.org/10.4467/16890027AP.16.017.5749","url":null,"abstract":"The response of ciliate communities to cyanobacterial bloom was investigated in a shallow, hypertrophic reservoir in Slovakia, central Europe. Seasonal dynamics of ciliate communities corresponded negatively with course of water bloom formation. The highest numbers and abundances of ciliate species occurred during the spring season when cyanobacterial bloom was not fully developed, while there was an abrupt decrease in both numbers and abundances at the beginning of summer when water bloom culminated. Cyanobacterial blooming thus significantly lowered diversity and equitability of ciliate communities: many rare and sporadic species disappeared and few common taxa flourished and dominated. Nonetheless, these leading ciliates formed a functionally diverse assemblage whose members showed mostly positive contemporaneous and only rarely time-shifted interactions. There were fine filter feeders (Cinetochilum margaritaceum, Dexiotricha granulosa, Paramecium caudatum and Spirostomum teres) grazing heterotrophic bacteria and picocyanobacteria, omnivorous fine to coarse filter feeders (Frontonia leucas) as well as hunters (Coleps hirtus, Holophrya teres and Loxophyllum helus) looking for an individual prey. Also a comparatively rich, anaerobic coenosis comprising various bacterivorous armophoreans and plagiopyleans, developed at the bottom of the reservoir. Our study documents that ciliates form functionally diverse communities with potential to control cyanobacterial blooms in hypertrophic reservoirs.","PeriodicalId":50883,"journal":{"name":"Acta Protozoologica","volume":"55 1","pages":"173-188"},"PeriodicalIF":0.5,"publicationDate":"2016-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70977516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 13

A New Amoeba with Protosteloid Fruiting: Luapeleamoeba hula n. g. n. sp. (Acanthamoebidae, Centramoebida, Amoebozoa) 一种具有原柱状果的变形虫新种:Luapeleamoeba hula n. g. n. sp.(棘阿米巴亚目，中阿米巴亚目，阿米巴亚目)

IF 0.5 4区生物学

Acta Protozoologica Pub Date : 2016-11-28 DOI: 10.4467/16890027AP.16.012.5744

Lora L. Shadwick, Matthew W. Brown, Alexander K Tice, F. Spiegel

{"title":"A New Amoeba with Protosteloid Fruiting: Luapeleamoeba hula n. g. n. sp. (Acanthamoebidae, Centramoebida, Amoebozoa)","authors":"Lora L. Shadwick, Matthew W. Brown, Alexander K Tice, F. Spiegel","doi":"10.4467/16890027AP.16.012.5744","DOIUrl":"https://doi.org/10.4467/16890027AP.16.012.5744","url":null,"abstract":"We describe a new protosteloid amoeba, Luapeleamoeba hula. Protosteloid amoebae, sometimes called protostelids, are sporocarpic amoebae that make fruiting bodies that consist of a stalk and one to a few spores. This new taxon was cultured from dead leaves of mamaki (Pipturus albidus) from the Manuka Natural Area Reserve, Hawaii, USA. Light microscopic examination showed that this amoeba has a short, rigid stalk with a small apophysis and a spore that changes shape continuously until it is shed and crawls away from the stalk. In addition, this amoeba was initially observed to maintain a diurnal rhythm in which fruiting body formation occurred primarily in the late afternoon. This new species is unique in both its amoebal and fruiting body morphology. Spore deciduousness appears to be a result of shape changes in the spore itself. This is the fourth species of protosteloid amoeba described with a clearly described diurnal rhythm. In addition, previous molecular phylogenetic analyses suggested that this new species has SSU rRNA gene sequences that clearly separate it from any other protosteloid amoebae and place it as sister to Protacanthamoeba bohemica among the Acanthamoebidae family in Centramoebida of Amoebozoa. Because this new amoeba species does not fit into any of the centramoebid genera, we have proposed a new genus Luapeleamoeba.","PeriodicalId":50883,"journal":{"name":"Acta Protozoologica","volume":"52 1","pages":"123-134"},"PeriodicalIF":0.5,"publicationDate":"2016-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70977264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 8

Trichodina diaptomi (Ciliophora: Peritrichia) from Two Calanoid Copepods from Botswana and South Africa, with Notes on its Life History 来自博茨瓦纳和南非的两种鱿鱼类桡足类的diaptomi(纤毛虫目:糙毛虫目)及其生活史的注释

IF 0.5 4区生物学

Acta Protozoologica Pub Date : 2016-11-28 DOI: 10.4467/16890027AP.16.016.5748

D. West, L. Basson, J. As

{"title":"Trichodina diaptomi (Ciliophora: Peritrichia) from Two Calanoid Copepods from Botswana and South Africa, with Notes on its Life History","authors":"D. West, L. Basson, J. As","doi":"10.4467/16890027AP.16.016.5748","DOIUrl":"https://doi.org/10.4467/16890027AP.16.016.5748","url":null,"abstract":"Members of the genus Trichodina are mostly found on fish, but have also been recorded from a variety of other aquatic organisms, including calanoid copepods. So far, it appears that all the trichodinid populations collected from calanoids in various parts of the world are the same species, i.e. Trichodina diaptomi Sramek-Husek, 1953. This paper reports on a new record of T. diaptomi from Metadiaptomus meridianus in a large reservoir in South Africa, as well as on a new host species, Metadiaptomus transvaalensis, and the first record of T. diaptomi from pools in an ephemeral river in northern Botswana, therefore adding a new country to the distribution of this species. We used the history of the discovery of T. diaptomi in different parts of the world and came to the conclusion that it is a cosmopolitan species, exclusively associated with copepods of the order Calanoida. Based on existing information, T. diaptomi does not appear to have a reservoir host. Against this background, we provide a discussion on the possibility that, although no dormant stage has been recorded for any trichodinid, it may be possible that T. diaptomi possesses some form of diapause and that this might be related to that of calanoid copepods.","PeriodicalId":50883,"journal":{"name":"Acta Protozoologica","volume":"55 1","pages":"161-171"},"PeriodicalIF":0.5,"publicationDate":"2016-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70977501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 9

Chlorophyll-a and Suspended Inorganic Material Affecting the Shell Traitsof Testate Amoebae Community 叶绿素-a和悬浮无机物对无卵变形虫群落壳性状的影响

IF 0.5 4区生物学

Acta Protozoologica Pub Date : 2016-11-28 DOI: 10.4467/16890027AP.16.014.5746

L. Schwind, R. L. Arrieira, C. Bonecker, F. Lansac-Tôha

{"title":"Chlorophyll-a and Suspended Inorganic Material Affecting the Shell Traitsof Testate Amoebae Community","authors":"L. Schwind, R. L. Arrieira, C. Bonecker, F. Lansac-Tôha","doi":"10.4467/16890027AP.16.014.5746","DOIUrl":"https://doi.org/10.4467/16890027AP.16.014.5746","url":null,"abstract":"Shell composition is considered an important functional trait in testate amoebae community. Differences in the composition of shells may represent adaptations of these organisms to changes in the availability of environmental resources. We aimed to evaluate the influence of these environmental resources on the presence of different testate amoeba species, based on observation of one important functional trait (shell composition), in floodplain environments. We hypothesised that species diversity would increase with increased availability of food (chlorophyll-a; a critical environmental requirement). We also predicted that a higher concentration of suspended inorganic material would contribute to the occurrence of species that have an exogenous shell. Testate amoeba samples were taken between 2002 and 2011 in plankton of ten floodplain environments. A significant positive correlation was noted between the concentration of chlorophyll-a and the diversity of testate amoeba species according to a simple regression analysis. Furthermore, non-metric multidimensional scaling showed distinct groups with lower and higher concentration of suspended inorganic material. The occurrence of testate amoeba species with smaller exogenous shells was the most influenced by environments with higher concentrations of suspended inorganic material. Thus, our results emphasised that the evaluated environmental resources are important as assembly factors to shell traits in testate amoebae community.","PeriodicalId":50883,"journal":{"name":"Acta Protozoologica","volume":"2016 1","pages":"145-154"},"PeriodicalIF":0.5,"publicationDate":"2016-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70977834","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 8

A new species of Flamella (Amoebozoa, Variosea, Gracilipodida) isolated from a freshwater pool in Southern Mississippi, USA 美国密西西比南部淡水池中分离的一新种(变形虫，变形虫科，细足科)

IF 0.5 4区生物学

Acta Protozoologica Pub Date : 2016-09-22 DOI: 10.4467/16890027AP.16.010.4945

Austin C. Walthall, Alexander K Tice, Matthew W. Brown

引用次数: 5