Pub Date : 2020-10-01DOI: 10.1080/0269249x.2020.1828175
Andrea M. Burfeid-Castellanos, M. Kloster, J. Cambra, B. Beszteri
It has been shown that size of planktonic diatoms responds to changes in water chemistry, but little is known about the influence of different types of environmental factors upon benthic diatom size variation. Here we ask whether water chemistry or hydromorphological influences show a stronger effect on benthic diatom morphometry. 10,624 diatom valves / frustules were imaged, identified and measured from 48 samples across eight sites in the Ebro river basin obtained during ten years of biomonitoring work. We analysed how differences in surface-to-volume (S/V) ratio and other morphometric characteristics were related to spatial and temporal variability in environmental parameters. Our results show that both hydrological and physicochemical variables generated significant responses in interspecific and intraspecific morphometric variation. S/V ratio and transapical width showed the strongest responses, followed by (the predominantly used) cell volume. Freshwater benthic diatom morphology seems to respond to diverse environmental factors and could provide complementary ecological information to community composition.
{"title":"Both hydrology and physicochemistry influence diatom morphometry","authors":"Andrea M. Burfeid-Castellanos, M. Kloster, J. Cambra, B. Beszteri","doi":"10.1080/0269249x.2020.1828175","DOIUrl":"https://doi.org/10.1080/0269249x.2020.1828175","url":null,"abstract":"It has been shown that size of planktonic diatoms responds to changes in water chemistry, but little is known about the influence of different types of environmental factors upon benthic diatom size variation. Here we ask whether water chemistry or hydromorphological influences show a stronger effect on benthic diatom morphometry. 10,624 diatom valves / frustules were imaged, identified and measured from 48 samples across eight sites in the Ebro river basin obtained during ten years of biomonitoring work. We analysed how differences in surface-to-volume (S/V) ratio and other morphometric characteristics were related to spatial and temporal variability in environmental parameters. Our results show that both hydrological and physicochemical variables generated significant responses in interspecific and intraspecific morphometric variation. S/V ratio and transapical width showed the strongest responses, followed by (the predominantly used) cell volume. Freshwater benthic diatom morphology seems to respond to diverse environmental factors and could provide complementary ecological information to community composition.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/0269249x.2020.1828175","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46167354","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}
Pub Date : 2020-10-01DOI: 10.1080/0269249x.2020.1813205
J. Simonato, J. Kociolek, Silvia E. Sala, Yasmin Plata Díaz, M. Núñez-Avellaneda
ABSTRACT Three new species of Luticola are described from lotic ecosystems in Andakí Municipal Natural Park, located in the Andean-Amazon region on the eastern flank of the eastern Andes mountain range in Colombia. Size and morphological features of the three new species, L. caquetensis Kociolek, Simonato & Núñez-Avellaneda sp. nov., L. andakiesiorum Simonato, Kociolek & Plata Díaz sp. nov., and L. sinchii Sala, Kociolek & Simonato sp. nov. are provided, based on light and scanning electron microscopical observations, and compared with similar congeners. Species of the genus are organized into groups depending upon whether they possess or lack marginal channels and/or pseudosepta. All the new species possess pseudosepta and L. caquetensis and L. andakiesiorum lack marginal channels. The two latter species share this combination of features with Luticola affinis Levkov et al., a species described from Brazil. These species thus form a unique group within the genus, offering additional evidence for the unique biodiversity found in this region.
{"title":"Three new Luticola species from the Andean-Amazonian transition in Colombia: taxonomy, morphology and preliminary considerations of the biogeography of the genus","authors":"J. Simonato, J. Kociolek, Silvia E. Sala, Yasmin Plata Díaz, M. Núñez-Avellaneda","doi":"10.1080/0269249x.2020.1813205","DOIUrl":"https://doi.org/10.1080/0269249x.2020.1813205","url":null,"abstract":"ABSTRACT Three new species of Luticola are described from lotic ecosystems in Andakí Municipal Natural Park, located in the Andean-Amazon region on the eastern flank of the eastern Andes mountain range in Colombia. Size and morphological features of the three new species, L. caquetensis Kociolek, Simonato & Núñez-Avellaneda sp. nov., L. andakiesiorum Simonato, Kociolek & Plata Díaz sp. nov., and L. sinchii Sala, Kociolek & Simonato sp. nov. are provided, based on light and scanning electron microscopical observations, and compared with similar congeners. Species of the genus are organized into groups depending upon whether they possess or lack marginal channels and/or pseudosepta. All the new species possess pseudosepta and L. caquetensis and L. andakiesiorum lack marginal channels. The two latter species share this combination of features with Luticola affinis Levkov et al., a species described from Brazil. These species thus form a unique group within the genus, offering additional evidence for the unique biodiversity found in this region.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/0269249x.2020.1813205","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46336148","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}
Pub Date : 2020-10-01DOI: 10.1080/0269249x.2020.1810781
QI Liu, Yandan Xiang, P. Yu, S. Xie, J. Kociolek
Light (LM) and scanning electron microscopy (SEM) observations were used to describe two new species of the freshwater monoraphid genus Crenotia Wojtal. Both species, Crenotia distincta, sp. nov. and Crenotia oblonga, sp. nov. have a unique stria structure, bi- to multiseriate terminating near the axial area. Internally, these terminal areolae have C-shaped openings that are occluded by a tapering flap, a feature unique to Crenotia species in China. The two species are easily distinguished from each other and from other members of the genus in both LM (size and valve outline) and SEM stria structure. The bi- to multiseriate nature of the striae suggests an affinity of this genus with Planothidium, but further phylogenetic analyses are required before the phylogenetic position of this genus is settled. Verified records of Crenotia are currently known from Europe and Asia, although species included in the genus by Wojtal have also been reported from North Africa and North America. The genus was originally described from springs but seems to have a wider ecological distribution.
{"title":"New and interesting diatoms from Tibet. II. Description of two new species of monoraphid diatoms","authors":"QI Liu, Yandan Xiang, P. Yu, S. Xie, J. Kociolek","doi":"10.1080/0269249x.2020.1810781","DOIUrl":"https://doi.org/10.1080/0269249x.2020.1810781","url":null,"abstract":"Light (LM) and scanning electron microscopy (SEM) observations were used to describe two new species of the freshwater monoraphid genus Crenotia Wojtal. Both species, Crenotia distincta, sp. nov. and Crenotia oblonga, sp. nov. have a unique stria structure, bi- to multiseriate terminating near the axial area. Internally, these terminal areolae have C-shaped openings that are occluded by a tapering flap, a feature unique to Crenotia species in China. The two species are easily distinguished from each other and from other members of the genus in both LM (size and valve outline) and SEM stria structure. The bi- to multiseriate nature of the striae suggests an affinity of this genus with Planothidium, but further phylogenetic analyses are required before the phylogenetic position of this genus is settled. Verified records of Crenotia are currently known from Europe and Asia, although species included in the genus by Wojtal have also been reported from North Africa and North America. The genus was originally described from springs but seems to have a wider ecological distribution.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/0269249x.2020.1810781","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46415317","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}
Pub Date : 2020-10-01DOI: 10.1080/0269249x.2020.1845807
L. F. Fernandes, Felipe Correr-Da-Silva
Minidiscus Hasle is a genus of small sized diatoms comprising about eight nanoplanktonic marine species. Renewed interest in this genus has arisen since recent investigations recorded a fairly high contribution of some species to the phytoplankton biomass on a global scale. In Brazil, very few studies have been performed, and only two species of Minidiscus have been reported over the 8500 Km coastline. In this paper, we report five species found in Southeast and South Brazilian waters: Minidiscus alphacrucis sp. nov., M. chilensis, M comicus, M. trioculatus, and M. variabilis (also the variety inornata). One of the tiniest diatom ever described, the new species M. alphacrucis has poroidal areolae, which are organized in radial striae with two rows of poroids, conspicuously limited by the interstriae. Minidiscus alphacrucis is compared with other morphologically similar species. In addition, the world distribution of the extant Minidiscus species is reviewed and discussed.
{"title":"Diversity and distribution of nanoplanktonic Minidiscus (Bacillariophyta) in shelf waters of the Southwest Atlantic Ocean","authors":"L. F. Fernandes, Felipe Correr-Da-Silva","doi":"10.1080/0269249x.2020.1845807","DOIUrl":"https://doi.org/10.1080/0269249x.2020.1845807","url":null,"abstract":"Minidiscus Hasle is a genus of small sized diatoms comprising about eight nanoplanktonic marine species. Renewed interest in this genus has arisen since recent investigations recorded a fairly high contribution of some species to the phytoplankton biomass on a global scale. In Brazil, very few studies have been performed, and only two species of Minidiscus have been reported over the 8500 Km coastline. In this paper, we report five species found in Southeast and South Brazilian waters: Minidiscus alphacrucis sp. nov., M. chilensis, M comicus, M. trioculatus, and M. variabilis (also the variety inornata). One of the tiniest diatom ever described, the new species M. alphacrucis has poroidal areolae, which are organized in radial striae with two rows of poroids, conspicuously limited by the interstriae. Minidiscus alphacrucis is compared with other morphologically similar species. In addition, the world distribution of the extant Minidiscus species is reviewed and discussed.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/0269249x.2020.1845807","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47620894","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}
Pub Date : 2020-10-01DOI: 10.1080/0269249x.2020.1842252
A. Glushchenko, J. Kociolek, I. Kuznetsova, M. Kulikovskiy
Six species of the genus Kobayasiella were found from waterbodies of Southeast Asia. Among them, four species were new to science and their formal descriptions are presented, illustrated with light and scanning electron micrographs. These are: K. laosica Glushchenko, Kulikovskiy & Kociolek sp. nov., K. vietnamensis Glushchenko, Kulikovskiy & Kociolek sp. nov., K. lamii Glushchenko, Kulikovskiy & Kociolek sp. nov. and K. vientianensis Glushchenko, Kulikovskiy & Kociolek sp. nov. In addition, two species of uncertain taxonomic status were observed: K. cf. parasubtilissima (H. Kobayasi & T. Nagumo) Lange-Bertalot and K. cf. saxicola (Manguin ex Kociolek & Reviers) Moser, Lange-Bertalot & Metzeltin. We compare these four species with similar taxa. These records represent the first known occurrences of the genus in waterbodies of Southeast Asia.
在东南亚的水体中发现了小林属的六个物种。其中，四个物种是科学上的新物种，并对其进行了正式描述，用光学和扫描电子显微照片进行了说明。它们是：K.laosica-Glushchenko，Kulikovskiy&Kociolek sp.nov.，K.vietnamensis Glushchenko，Kuikovskiy&Kociolek sp.nov.、K.lamii-Glushcchenko，Kulikovskiy&Kocioleksp.nov..和K.vientianensis Glushchenko、Kulikovkiy&Kociolek sp.nov。此外，还观察到两个分类地位不确定的物种：K.cf.parasubtilissima（H.Kobayasi&T。Nagumo）Lange Bertalot和K.参见saxicola（Manguin ex Kociolek&Reviers）Moser，Lange Berdalot&Metzeltin。我们将这四个物种与相似的分类群进行比较。这些记录代表了该属首次在东南亚水体中出现。
{"title":"Four new species from the diatom genus Kobayasiella Lange-Bertalot from waterbodies of Southeast Asia","authors":"A. Glushchenko, J. Kociolek, I. Kuznetsova, M. Kulikovskiy","doi":"10.1080/0269249x.2020.1842252","DOIUrl":"https://doi.org/10.1080/0269249x.2020.1842252","url":null,"abstract":"Six species of the genus Kobayasiella were found from waterbodies of Southeast Asia. Among them, four species were new to science and their formal descriptions are presented, illustrated with light and scanning electron micrographs. These are: K. laosica Glushchenko, Kulikovskiy & Kociolek sp. nov., K. vietnamensis Glushchenko, Kulikovskiy & Kociolek sp. nov., K. lamii Glushchenko, Kulikovskiy & Kociolek sp. nov. and K. vientianensis Glushchenko, Kulikovskiy & Kociolek sp. nov. In addition, two species of uncertain taxonomic status were observed: K. cf. parasubtilissima (H. Kobayasi & T. Nagumo) Lange-Bertalot and K. cf. saxicola (Manguin ex Kociolek & Reviers) Moser, Lange-Bertalot & Metzeltin. We compare these four species with similar taxa. These records represent the first known occurrences of the genus in waterbodies of Southeast Asia.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/0269249x.2020.1842252","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45022902","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}
Pub Date : 2020-07-02DOI: 10.1080/0269249x.2020.1787229
Adil Y. AL-HANDAL, Maja Mucko, A. Wulff
The genus Entomoneis includes diatoms with an elevated bilobate keel, a sigmoid raphe canal and numerous girdle bands. It is known to inhabit various environments, from freshwater to marine, both plankton and benthos. During a phytoplankton investigation in the Kungälv estuary on the west coast of Sweden, we observed numerous cells belonging to Entomoneis. Further morphological investigations performed with light and electron microscopy allowed us to describe Entomoneis annagodhei, sp. nov., with a unique set of morphological characters. Most importantly, a still undocumented character proved to be an oblique transapical fascia across the centre of the valve. Other distinctive features of this species are a pronounced raphe canal with dense raphe fibulae, very fine striation, resolvable only with electron microscopy, external lanceolate slit-like opening of the central nodule, and fine, linear to undulate external ridges running more or less parallel and adjacent to the raphe and valve margin. The morphological characters and morphometry are discussed in comparison with similar taxa. Our results contribute to the under-appreciated diversity of Entomoneis, especially inhabiting the marine plankton.
{"title":"Entomoneis annagodhei sp. nov., a new marine diatom (Entomoneidaceae, Bacillariophyta) from the west coast of Sweden","authors":"Adil Y. AL-HANDAL, Maja Mucko, A. Wulff","doi":"10.1080/0269249x.2020.1787229","DOIUrl":"https://doi.org/10.1080/0269249x.2020.1787229","url":null,"abstract":"The genus Entomoneis includes diatoms with an elevated bilobate keel, a sigmoid raphe canal and numerous girdle bands. It is known to inhabit various environments, from freshwater to marine, both plankton and benthos. During a phytoplankton investigation in the Kungälv estuary on the west coast of Sweden, we observed numerous cells belonging to Entomoneis. Further morphological investigations performed with light and electron microscopy allowed us to describe Entomoneis annagodhei, sp. nov., with a unique set of morphological characters. Most importantly, a still undocumented character proved to be an oblique transapical fascia across the centre of the valve. Other distinctive features of this species are a pronounced raphe canal with dense raphe fibulae, very fine striation, resolvable only with electron microscopy, external lanceolate slit-like opening of the central nodule, and fine, linear to undulate external ridges running more or less parallel and adjacent to the raphe and valve margin. The morphological characters and morphometry are discussed in comparison with similar taxa. Our results contribute to the under-appreciated diversity of Entomoneis, especially inhabiting the marine plankton.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/0269249x.2020.1787229","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42198702","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}
Pub Date : 2020-07-02DOI: 10.1080/0269249x.2020.1801517
D. Berthold, T. Frankovich, E. Gaiser, H. D. Laughinghouse
In this work, we propose and describe a novel diatom species, Fistulifera alcalina sp. nov., isolated from Port Mayaca on Lake Okeechobee, Florida (USA). This new diatom species represents a distinct lineage within the genus Fistulifera, which includes F. iranensis (Hustedt) Lange-Bertalot, F. saprophila (Lange-Bertalot & Bonik) Lange-Bertalot, F. pelliculosa (Kützing) Lange-Bertalot, and F. solaris S. Mayama, M. Matsumoto, K. Nemoto & T. Tanaka. Morphometric and molecular phylogenetic analyses of the 18S rRNA and rbcL genes strongly support Fistulifera alcalina as a new species. Fistulifera alcalina sp. nov. is cultured in media with moderate salinity and high bicarbonate concentrations in contrast to the other species of Fistulifera which show ecological preferences for high salinity and eutrophic or oligotrophic waters. This is also the first record of Fistulifera in the southeastern United States (Florida, USA).
在这项工作中，我们提出并描述了一种新的硅藻物种，Fistulifera alcalina sp. nov.，分离自美国佛罗里达州奥基乔比湖的玛雅卡港。这一新的硅藻物种代表了fisstulifera属中一个独特的谱系，其中包括F. iranensis (Hustedt) Lange-Bertalot, F. saprophila (Lange-Bertalot & Bonik) Lange-Bertalot, F. pelliculosa (k tzing) Lange-Bertalot和F. solaris S. Mayama, M. Matsumoto, K. Nemoto和T. Tanaka。18S rRNA和rbcL基因的形态测定和分子系统发育分析有力地支持了该属新种的存在。在中等盐度和高碳酸氢盐浓度的培养基中培养alcalina sp. 11 .与其他种类的fisstulifera相比，它们表现出对高盐度和富营养化或少营养化水域的生态偏好。这也是在美国东南部(美国佛罗里达州)首次记录到的fisstulifera。
{"title":"Fistulifera alcalina sp. nov. (Naviculales, Stauroneidaceae) a new alkaliphilic diatom species from Lake Okeechobee, Florida (USA)","authors":"D. Berthold, T. Frankovich, E. Gaiser, H. D. Laughinghouse","doi":"10.1080/0269249x.2020.1801517","DOIUrl":"https://doi.org/10.1080/0269249x.2020.1801517","url":null,"abstract":"In this work, we propose and describe a novel diatom species, Fistulifera alcalina sp. nov., isolated from Port Mayaca on Lake Okeechobee, Florida (USA). This new diatom species represents a distinct lineage within the genus Fistulifera, which includes F. iranensis (Hustedt) Lange-Bertalot, F. saprophila (Lange-Bertalot & Bonik) Lange-Bertalot, F. pelliculosa (Kützing) Lange-Bertalot, and F. solaris S. Mayama, M. Matsumoto, K. Nemoto & T. Tanaka. Morphometric and molecular phylogenetic analyses of the 18S rRNA and rbcL genes strongly support Fistulifera alcalina as a new species. Fistulifera alcalina sp. nov. is cultured in media with moderate salinity and high bicarbonate concentrations in contrast to the other species of Fistulifera which show ecological preferences for high salinity and eutrophic or oligotrophic waters. This is also the first record of Fistulifera in the southeastern United States (Florida, USA).","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/0269249x.2020.1801517","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46369054","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}
Pub Date : 2020-07-02DOI: 10.1080/0269249x.2020.1797884
K. A. Haberyan, S. Horn
The genus Aulacoseira is cosmopolitan and often abundant in fresh waters. In Costa Rica, freshwater diatom surveys have been restricted to flowing waters, aside from our own explorations. Among sediment samples from some 90 lakes we have encountered an undescribed species which we herein propose to name Aulacoseira umanai Haberyan sp. nov. In this species, the face of larger valves often bears ridges and tubercles (knobs); separation spines are short (<2.3 µm) and longer spines are absent. The ringleiste is thick, solid, and very wide. This, in combination with its short collum, distinguishes A. umanai from many other species of the genus. Aulacoseira umanai is abundant in the surficial sediments of multiple glacial lakes that are over 3450 m in elevation on Cerro Chirripó; it is also abundant in glacial-age deposits in La Chonta bog (2310 m a.s.l.). It seems to have evolved from an ancestor that resembled A. alpigena; the locality of this event is unknown but was likely to have been a high-altitude lake in the Central American isthmus.
Aulacoseira属是世界性的，经常在淡水中大量存在。在哥斯达黎加，除了我们自己的探索外，淡水硅藻调查仅限于流动水域。在大约90个湖泊的沉积物样本中，我们遇到了一个未描述的物种，我们在这里建议将其命名为Aulacoseira umanai Haberyan sp.nov。在这个物种中，较大的阀瓣表面通常带有脊和结节（结节）；分离棘较短（<2.3 µm），并且没有较长的刺。环纹岩厚、坚硬且非常宽。这一点，再加上它的短茎，将A.umanai与该属的许多其他物种区分开来。乌马奈奥拉科塞拉丰富地存在于超过3450个冰川湖的表层沉积物中 Cerro Chirripó海拔m；它在La Chonta沼泽的冰川时代沉积物中也很丰富（2310 m a.s.l.）。它似乎是从一个类似于a.alpigena的祖先进化而来的；这一事件的地点尚不清楚，但很可能是中美洲地峡的一个高海拔湖泊。
{"title":"Discovery of an undescribed species of Aulacoseira from highland Costa Rica","authors":"K. A. Haberyan, S. Horn","doi":"10.1080/0269249x.2020.1797884","DOIUrl":"https://doi.org/10.1080/0269249x.2020.1797884","url":null,"abstract":"The genus Aulacoseira is cosmopolitan and often abundant in fresh waters. In Costa Rica, freshwater diatom surveys have been restricted to flowing waters, aside from our own explorations. Among sediment samples from some 90 lakes we have encountered an undescribed species which we herein propose to name Aulacoseira umanai Haberyan sp. nov. In this species, the face of larger valves often bears ridges and tubercles (knobs); separation spines are short (<2.3 µm) and longer spines are absent. The ringleiste is thick, solid, and very wide. This, in combination with its short collum, distinguishes A. umanai from many other species of the genus. Aulacoseira umanai is abundant in the surficial sediments of multiple glacial lakes that are over 3450 m in elevation on Cerro Chirripó; it is also abundant in glacial-age deposits in La Chonta bog (2310 m a.s.l.). It seems to have evolved from an ancestor that resembled A. alpigena; the locality of this event is unknown but was likely to have been a high-altitude lake in the Central American isthmus.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/0269249x.2020.1797884","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48268565","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}
Pub Date : 2020-07-02DOI: 10.1080/0269249x.2020.1800518
Yuhang Li, T. Nagumo, Zhongmin Sun, Kuidong Xu
Three benthic Gyrosigma species isolated from sediments of a tropical mangrove in Hainan Island, China, are described using light, scanning and transmission electron microscopy: G. centropunctatum sp. nov., G. dongzhaiense sp. nov. and G. orbitum Thaler et Kaczmarska. Gyrosigma centropunctatum is a tube-dwelling species possessing a unique row of pores on either side of the central area. Gyrosigma dongzhaiense differs from congeners by a combination of small cell size, linear-sigmoid outline, and higher stria density. Gyrosigma orbitum is another tube-dwelling species, which possesses two remarkable oval pits on the external central area. This study expands our knowledge of the marine species diversity and distribution of Gyrosigma in the tropical Western Pacific. We discuss the taxonomic significance of tubes in the species identification of Gyrosigma.
利用光学、扫描和透射电子显微镜描述了从中国海南岛热带红树林沉积物中分离出的三种底栖Gyrosigma物种：G.centropunctatum sp.nov.、G.dongzhaiense sp.nov..和G.orbitum Thaler et Kaczmarska。着丝点陀螺是一种管栖物种，在中心区域的两侧都有一排独特的孔。东寨回旋西格玛与同类的不同之处在于细胞大小小、线形S形轮廓和更高的条纹密度。圆脊灰蝶是另一种管栖物种，在外部中心区域有两个显著的椭圆形凹坑。这项研究扩展了我们对热带西太平洋海洋物种多样性和Gyrosigma分布的了解。我们讨论了管在陀螺虫物种鉴定中的分类学意义。
{"title":"Morphology of three benthic diatoms from a tropical mangrove in Hainan Island, China: Gyrosigma centropunctatum sp. nov., G. dongzhaiense sp. nov. and G. orbitum Thaler et Kaczmarska","authors":"Yuhang Li, T. Nagumo, Zhongmin Sun, Kuidong Xu","doi":"10.1080/0269249x.2020.1800518","DOIUrl":"https://doi.org/10.1080/0269249x.2020.1800518","url":null,"abstract":"Three benthic Gyrosigma species isolated from sediments of a tropical mangrove in Hainan Island, China, are described using light, scanning and transmission electron microscopy: G. centropunctatum sp. nov., G. dongzhaiense sp. nov. and G. orbitum Thaler et Kaczmarska. Gyrosigma centropunctatum is a tube-dwelling species possessing a unique row of pores on either side of the central area. Gyrosigma dongzhaiense differs from congeners by a combination of small cell size, linear-sigmoid outline, and higher stria density. Gyrosigma orbitum is another tube-dwelling species, which possesses two remarkable oval pits on the external central area. This study expands our knowledge of the marine species diversity and distribution of Gyrosigma in the tropical Western Pacific. We discuss the taxonomic significance of tubes in the species identification of Gyrosigma.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/0269249x.2020.1800518","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42242858","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：