Pub Date : 2018-11-01DOI: 10.7872/crya/v39.iss4.2018.481
D. Mella-Flores, J. Machon, L. Contreras-Porcia, Sabina Mesa–Campbell, P. Dassow
Résumé Emiliania huxleyi est un coccolithophore cosmopolite qui présente un haut degré de variabilité génétique et physiologique aussi bien entre souches qu'entre les étapes de son cycle de vie. Ici, nous avons examiné si les réponses au cuivre (Cu) et au stress oxydatif varient selon l'origine environnementale ou l'étape du cycle de vie. Nous avons comparé les réponses à des concentrations toxiques de Cu et à des expositions à court terme au peroxyde d'hydrogène de douze souches (huit diploïdes et deux paires de souches où haploïdes and diploïdes partagent la même base génétique) provenant de différentes origines océanographiques. Les réponses mesurées comprenaient le taux de croissance, les proportions de coccolithes malformés/incomplètes (souches diploïdes), la motilité (souches haploïdes), la fluorescence variable (Fv/Fm, une mesure de la santé de photosystème), analyses de cytométrie en flux des pourcentages de cellules vivantes et l'accumulation des dérivés réactives de l'oxygène (DRO), et les activités des enzymes ascorbate peroxydase (AP) et glutathion peroxydase (GP). Bien qu'une importante variabilité ait été observable entre les réponses au stress de ces souches, aucune différence statistique n'a été détectée lorsque les souches ont été regroupées par origines. Dans les deux paires diploïdes/haploïdes, les diploïdes ont montré une plus grande sensibilité a l'inhibition de la croissance par Cu que leurs haploïdes correspondants, bien que cette différence n'était significatif que dans le cas de la paire diploide–haploide qui est issue d'un isolât de la mer de Tasman (RCC1216 / RCC1217). Les diploïdes accumulent rapidement DRO en réponse a une exposition aigue a Cu, alors que l'accumulation de DRO dans haploïdes était beaucoup plus faible. Notablement, il n'y a eu pas des différences dans les DRO induites par Cu entre les diploïdes sensibles et résistantes, ou entre les haploïdes sensibles et résistantes. Les différences de sensibilité au Cu entre les souches ont été reflétées dans les différences d'activité AP constitutive, mais aucune différence entre les souches dans l'activité GP constitutive ou induite n'a été détectée. Les différences dans l'activité AP constitutive, mais non dans l'activité GP induite par Cu, reflètent la sensibilité au Cu. Dans l'ensemble, nos résultats montrent une variabilité intraspécifique élevée parmi les génotypes et les phases du cycle de vie de E. huxleyi, ce qui pourrait refléter en partie les différences dans la tolérance au stress oxydatif.
{"title":"Differential Responses of Emiliania huxleyi (Haptophyta) Strains to Copper Excess","authors":"D. Mella-Flores, J. Machon, L. Contreras-Porcia, Sabina Mesa–Campbell, P. Dassow","doi":"10.7872/crya/v39.iss4.2018.481","DOIUrl":"https://doi.org/10.7872/crya/v39.iss4.2018.481","url":null,"abstract":"Résumé \u0000 Emiliania huxleyi est un coccolithophore cosmopolite qui présente un haut degré de variabilité génétique et physiologique aussi bien entre souches qu'entre les étapes de son cycle de vie. Ici, nous avons examiné si les réponses au cuivre (Cu) et au stress oxydatif varient selon l'origine environnementale ou l'étape du cycle de vie. Nous avons comparé les réponses à des concentrations toxiques de Cu et à des expositions à court terme au peroxyde d'hydrogène de douze souches (huit diploïdes et deux paires de souches où haploïdes and diploïdes partagent la même base génétique) provenant de différentes origines océanographiques. Les réponses mesurées comprenaient le taux de croissance, les proportions de coccolithes malformés/incomplètes (souches diploïdes), la motilité (souches haploïdes), la fluorescence variable (Fv/Fm, une mesure de la santé de photosystème), analyses de cytométrie en flux des pourcentages de cellules vivantes et l'accumulation des dérivés réactives de l'oxygène (DRO), et les activités des enzymes ascorbate peroxydase (AP) et glutathion peroxydase (GP). Bien qu'une importante variabilité ait été observable entre les réponses au stress de ces souches, aucune différence statistique n'a été détectée lorsque les souches ont été regroupées par origines. Dans les deux paires diploïdes/haploïdes, les diploïdes ont montré une plus grande sensibilité a l'inhibition de la croissance par Cu que leurs haploïdes correspondants, bien que cette différence n'était significatif que dans le cas de la paire diploide–haploide qui est issue d'un isolât de la mer de Tasman (RCC1216 / RCC1217). Les diploïdes accumulent rapidement DRO en réponse a une exposition aigue a Cu, alors que l'accumulation de DRO dans haploïdes était beaucoup plus faible. Notablement, il n'y a eu pas des différences dans les DRO induites par Cu entre les diploïdes sensibles et résistantes, ou entre les haploïdes sensibles et résistantes. Les différences de sensibilité au Cu entre les souches ont été reflétées dans les différences d'activité AP constitutive, mais aucune différence entre les souches dans l'activité GP constitutive ou induite n'a été détectée. Les différences dans l'activité AP constitutive, mais non dans l'activité GP induite par Cu, reflètent la sensibilité au Cu. Dans l'ensemble, nos résultats montrent une variabilité intraspécifique élevée parmi les génotypes et les phases du cycle de vie de E. huxleyi, ce qui pourrait refléter en partie les différences dans la tolérance au stress oxydatif.","PeriodicalId":51000,"journal":{"name":"Cryptogamie Algologie","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79827715","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}
Pub Date : 2018-11-01DOI: 10.7872/crya/v39.iss4.2018.391
M. Croce, P. Díaz-Tapia, Heroen Verbruggen
Abstract The widely distributed genus Codium is a major component of the marine macroalgal flora and has its largest species diversity in warm-temperate regions. Along the South coast of Australia, Codium is a diverse group, but the species diversity in the easternmost region of Victoria is not well-documented. In this study, we characterized the species diversity of Codium from Croajingolong National Park, Gabo Island Lighthouse Reserve and Cape Howe Marine National Park. The specimens were collected from a wide range of microhabitats during an expedition of the Bush Blitz program, and Codium species were delimited through a combination of molecular analyses of the chloroplast markers tufA and rbcL, and morphological observations. Six species-level clusters were found, corresponding to the native C. australicum, C. harveyi, C. lucasii.1 and C. fragile subsp. novae-zelandiae; and the exotic C. fragile subsp. fragile and C. tenue. The specimens of C. australicum showed variability in the architecture of the thallus that was attributed to the different habitats where they were collected. The utricles of C. harveyi were unusual in having a thick apical cell wall that protruded inwards and had internal projections. The species found in eastern Victoria are typical of the Flindersian and Peronian biogeographic provinces, and the low diversity of Codium species in this region is comparable to that of New South Wales.
{"title":"Molecular Systematics of the Siphonous Green Algal Genus Codium in Eastern Victoria, Australia","authors":"M. Croce, P. Díaz-Tapia, Heroen Verbruggen","doi":"10.7872/crya/v39.iss4.2018.391","DOIUrl":"https://doi.org/10.7872/crya/v39.iss4.2018.391","url":null,"abstract":"Abstract The widely distributed genus Codium is a major component of the marine macroalgal flora and has its largest species diversity in warm-temperate regions. Along the South coast of Australia, Codium is a diverse group, but the species diversity in the easternmost region of Victoria is not well-documented. In this study, we characterized the species diversity of Codium from Croajingolong National Park, Gabo Island Lighthouse Reserve and Cape Howe Marine National Park. The specimens were collected from a wide range of microhabitats during an expedition of the Bush Blitz program, and Codium species were delimited through a combination of molecular analyses of the chloroplast markers tufA and rbcL, and morphological observations. Six species-level clusters were found, corresponding to the native C. australicum, C. harveyi, C. lucasii.1 and C. fragile subsp. novae-zelandiae; and the exotic C. fragile subsp. fragile and C. tenue. The specimens of C. australicum showed variability in the architecture of the thallus that was attributed to the different habitats where they were collected. The utricles of C. harveyi were unusual in having a thick apical cell wall that protruded inwards and had internal projections. The species found in eastern Victoria are typical of the Flindersian and Peronian biogeographic provinces, and the low diversity of Codium species in this region is comparable to that of New South Wales.","PeriodicalId":51000,"journal":{"name":"Cryptogamie Algologie","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83385168","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}
Pub Date : 2018-11-01DOI: 10.7872/crya/v39.iss4.2018.449
N. Koletić, A. Alegro, N. Vuković, A. Rimac, V. Šegota
Abstract This paper reports the occurrence of the freshwater brown alga Heribaudiella fluviatilis (Areschoug) Svedelius in four new localities in southeastern Europe, as well as the first records for Croatia. Additionally, we report here a new type of substrate for H. fluviatilis, on stones in karstic rivers characterized by tufa formations. Despite a generally low number of findings, this and previous studies indicate that the species is not as rare as generally perceived; rather, it is overlooked, under-collected and therefore under-reported. The paper provides detailed diagnostic features of the thalli and habitats where the alga was found, with notes on corresponding vegetation, physical conditions and water chemistry. Additionally, along with the new records of the red alga Hildenbrandia rivularis (Liebmann) J. Agardh in Croatia, the associations of Heribaudiella-Hildenbrandia are reported for streams of Black Sea and Adriatic basins.
摘要报道了东南欧4个新发现的淡水褐藻Heribaudiella fluviatilis (Areschoug) Svedelius的出现,以及克罗地亚的首次记录。此外,我们在这里报告了一种新型的河流嗜血杆菌基质,在以凝灰岩地层为特征的喀斯特河流的石头上。尽管发现的数量普遍较少,但这项研究和以前的研究表明,该物种并不像人们通常认为的那样罕见;相反,它被忽视,收集不足,因此报告不足。本文提供了详细的菌体诊断特征和发现藻类的栖息地,并对相应的植被、物理条件和水化学进行了说明。此外,随着克罗地亚红藻Hildenbrandia rivularis (Liebmann) J. Agardh的新记录,在黑海和亚得里亚海盆地的河流中报道了Heribaudiella-Hildenbrandia的关联。
{"title":"Spotting the Spots: The Freshwater Brown Alga Heribaudiella fluviatilis (Areschoug) Svedelius within Stream Communities of Southeastern Europe","authors":"N. Koletić, A. Alegro, N. Vuković, A. Rimac, V. Šegota","doi":"10.7872/crya/v39.iss4.2018.449","DOIUrl":"https://doi.org/10.7872/crya/v39.iss4.2018.449","url":null,"abstract":"Abstract This paper reports the occurrence of the freshwater brown alga Heribaudiella fluviatilis (Areschoug) Svedelius in four new localities in southeastern Europe, as well as the first records for Croatia. Additionally, we report here a new type of substrate for H. fluviatilis, on stones in karstic rivers characterized by tufa formations. Despite a generally low number of findings, this and previous studies indicate that the species is not as rare as generally perceived; rather, it is overlooked, under-collected and therefore under-reported. The paper provides detailed diagnostic features of the thalli and habitats where the alga was found, with notes on corresponding vegetation, physical conditions and water chemistry. Additionally, along with the new records of the red alga Hildenbrandia rivularis (Liebmann) J. Agardh in Croatia, the associations of Heribaudiella-Hildenbrandia are reported for streams of Black Sea and Adriatic basins.","PeriodicalId":51000,"journal":{"name":"Cryptogamie Algologie","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85563634","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}
Pub Date : 2018-11-01DOI: 10.7872/crya/v39.iss4.2018.525
C. Boudouresque
{"title":"Minouche Knoepffler–Péguy (1934–2018), the ‘Dame de Banyuls’ (the Lady of Banyuls)","authors":"C. Boudouresque","doi":"10.7872/crya/v39.iss4.2018.525","DOIUrl":"https://doi.org/10.7872/crya/v39.iss4.2018.525","url":null,"abstract":"","PeriodicalId":51000,"journal":{"name":"Cryptogamie Algologie","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74115694","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}
Pub Date : 2018-11-01DOI: 10.7872/crya/v39.iss4.2018.465
Marina G. Potapova
Abstract Three rare Psammothidium species were found in recently surveyed lakes of Northeastern Siberia, Russia. One of these species found in lakes of the Kolyma Lowland, is new for science and is formally described here as Psammothidium onufrii sp. nov. It is morphologically similar to the brackish–water species Achnanthes punctulata, but it lacks a central area on rapheless valve and possesses a large central area on the raphe valve. Psammothidium onufrii is characteristic for tundra thermokarst lakes with moderate mineral content. Psammothidium sacculum previously reported from a few subarctic and arctic locations was found in several lakes of the Kolyma Lowland and of the Magadan District. The frustule ultrastructure of this species is documented for the first time here. The third species, known as Achnanthes obliqua (W. Gregory) Hustedt and transferred here to Psammothidium, is a morphologically distinct and relatively rare diatom occasionally reported from northern regions of Eurasia and Western North America. In Northeastern Siberia it was found in sediments of relatively large shallow lakes with low to moderate mineral content. Detailed morphological characterization of the three Psammothidium species will facilitate their detection in environmental surveys and their use in paleoenvironmental reconstructions.
{"title":"New and Rare Psammothidium Species (Bacillariophyta, Achnanthidiaceae) from Northeastern Siberia","authors":"Marina G. Potapova","doi":"10.7872/crya/v39.iss4.2018.465","DOIUrl":"https://doi.org/10.7872/crya/v39.iss4.2018.465","url":null,"abstract":"Abstract \u0000 Three rare Psammothidium species were found in recently surveyed lakes of Northeastern Siberia, Russia. One of these species found in lakes of the Kolyma Lowland, is new for science and is formally described here as Psammothidium onufrii sp. nov. It is morphologically similar to the brackish–water species Achnanthes punctulata, but it lacks a central area on rapheless valve and possesses a large central area on the raphe valve. Psammothidium onufrii is characteristic for tundra thermokarst lakes with moderate mineral content. Psammothidium sacculum previously reported from a few subarctic and arctic locations was found in several lakes of the Kolyma Lowland and of the Magadan District. The frustule ultrastructure of this species is documented for the first time here. The third species, known as Achnanthes obliqua (W. Gregory) Hustedt and transferred here to Psammothidium, is a morphologically distinct and relatively rare diatom occasionally reported from northern regions of Eurasia and Western North America. In Northeastern Siberia it was found in sediments of relatively large shallow lakes with low to moderate mineral content. Detailed morphological characterization of the three Psammothidium species will facilitate their detection in environmental surveys and their use in paleoenvironmental reconstructions.","PeriodicalId":51000,"journal":{"name":"Cryptogamie Algologie","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78463401","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}
Pub Date : 2018-11-01DOI: 10.7872/crya/v39.iss4.2018.535
C. E. Wetzel, M. J. Wynne
{"title":"New Taxa Proposed in Cryptogamie, Algologie, vol. 39, 2018","authors":"C. E. Wetzel, M. J. Wynne","doi":"10.7872/crya/v39.iss4.2018.535","DOIUrl":"https://doi.org/10.7872/crya/v39.iss4.2018.535","url":null,"abstract":"","PeriodicalId":51000,"journal":{"name":"Cryptogamie Algologie","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89329831","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}
Pub Date : 2018-11-01DOI: 10.7872/crya/v39.iss4.2018.431
C. Schneider, Maura K. Griffith, C. Lane, G. Saunders
Abstract Using molecular-assisted alpha taxonomy, we have uncovered two new pseudocryptic species of Champia in Bermuda, as well as have demonstrated that the European C. parvula, a name previously applied to historical Bermuda collections, and C. farlowii recently described from southern New England, USA, are not part of the island flora. We present COI-5P and rbcL, as well as morphological, evidence to describe two endemic species for the islands, C. hasselbringii sp. nov. and C. insularis sp. nov. They are similar species with compressed but variable axes and a wealth of overlapping anatomical characteristics. However, the two species are distinguished not only by their genetics, but also by reproductive features that are commonly found in the small prostrate, epiphytic species. It is possible that C. hasselbringii could be the correct name for species reported in warm waters of the western Atlantic as C. compressa or C. vieillardii, species with type localities in South Africa and New Caledonia, respectively.
{"title":"Notes on the Marine Algae of the Bermudas. 16. Two New Epiphytic Species of Champia (Champiaceae, Rhodymeniales), C. hasselbringii and C. insularis","authors":"C. Schneider, Maura K. Griffith, C. Lane, G. Saunders","doi":"10.7872/crya/v39.iss4.2018.431","DOIUrl":"https://doi.org/10.7872/crya/v39.iss4.2018.431","url":null,"abstract":"Abstract Using molecular-assisted alpha taxonomy, we have uncovered two new pseudocryptic species of Champia in Bermuda, as well as have demonstrated that the European C. parvula, a name previously applied to historical Bermuda collections, and C. farlowii recently described from southern New England, USA, are not part of the island flora. We present COI-5P and rbcL, as well as morphological, evidence to describe two endemic species for the islands, C. hasselbringii sp. nov. and C. insularis sp. nov. They are similar species with compressed but variable axes and a wealth of overlapping anatomical characteristics. However, the two species are distinguished not only by their genetics, but also by reproductive features that are commonly found in the small prostrate, epiphytic species. It is possible that C. hasselbringii could be the correct name for species reported in warm waters of the western Atlantic as C. compressa or C. vieillardii, species with type localities in South Africa and New Caledonia, respectively.","PeriodicalId":51000,"journal":{"name":"Cryptogamie Algologie","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77363070","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}
Pub Date : 2018-11-01DOI: 10.7872/crya/v39.iss4.2018.409
Hélène Dubrasquet, Janette Reyes, R. P. Sanchez, N. Valdivia, M. Guillemin
Résumé La flore marine de la zone Antarctique est supposée bien connue car relativement peu d' espèces y sont observées par rapport à d'autres régions du monde. En utilisant la taxonomie traditionnelle combinée aux outils moléculaires, nous avons étudié la diversité et biogéographie des communautés de macroalgues rouges le long de la côte Ouest de la Péninsule Antarctique (WAP) et des îles Shetlands du Sud (SShs) en considérant un gradient bathymétrique. Nous avons également comparé nos deux méthodes d'identification en terme de précision et de nombre de taxa identifiés. Nos résultats ont démontré de faibles et homogènes niveaux de diversité à l'échelle de la zone d'étude comme à échelle locale, avec au total environ 50 taxa identifiés. Nous avons également détecté trois complexes d'espèces cryptiques chez les genres Callophyllis, Curdiea et Georgiella, et amélioré l'identification de nos spécimens puisque 98% ont été identifiés jusqu'à l'espèce grâce grace aux outils moléculaires. Nos résultats ont aussi permis de révéler des différences significatives entre les assemblages de macroalgues rouges appartenant à trois sub-régions, correspondant à des latitudes différentes: SShs et partie Nord de la WAP (≈63°S), la partie centrale de la WAP (≈64°S) et la partie Centre-Sud de la WAP (≈67°S). Nos sub-régions ne correspondent pas à la séparation classique entre SShs/WAP proposée dans les études antérieures, et suggèrent d'une part, que le détroit de Bransfield n'est pas une barrière biogéographique forte pour les macroalgues rouge et d'autre part, que la dynamique actuelle et passée de la couverture de glace a pu jouer un rôle déterminant dans la distribution actuelle des assemblages de macroalgues rouges. Finalement, notre travail a permis de construire une banque de données génétiques associée à un herbier de collection de spécimens, et va permettre d'appuyer des travaux futurs pour mieux comprendre la diversité et distribution des communautés d'algues rouges dans la zone d'étude. Abstract The Antarctic marine flora is well known as a flora composed of relatively few species in comparison with other marine realms. Using molecular taxonomy as complementary tool for traditional taxonomy, we studied red macroalgal diversity and biogeography along the Western Antarctic Peninsula (WAP) and South Shetlands Islands (SShs) coasts and across a bathymetric gradient; in addition, we compared both methods of identification in terms of accuracy and number of observed taxa. Our results show low diversity levels at the regional and local scales, with around 50 taxa registered in total. Molecular tools allowed us to detect putative cryptic species within the genera Callophyllis, Curdiea and Georgiella, and to identify 98% of our specimens at species level. Our results also allowed us to identify significant differences between red macroalgal assemblages of three distinct biogeographic sub-regions: SShs and Northern part of the WAP (at ≈63°S), Central part of the
南极地区的海洋植物群被认为是众所周知的,因为与世界其他地区相比,在那里观察到的物种相对较少。利用传统分类学结合分子工具,我们研究了南极半岛西海岸(WAP)和南设得兰群岛(SShs)红大型藻类群落的多样性和生物地理,并考虑了水深梯度。我们还比较了两种鉴定方法的准确性和鉴定率的数量。我们的结果显示,在研究区域和局部范围内,多样性水平较低且均匀,共鉴定出约50个类群。我们还在Callophyllis属、Curdiea属和Georgiella属中检测了3个隐种复合体,并改进了标本的鉴定,利用分子工具鉴定了98%的物种。我们的结果还揭示了WAP的SShs和北部(≈63°S)、WAP的中部(≈64°S)和WAP的中南部(≈67°S)三个亚区域的大型红藻组合之间的显著差异。分离我们sub-régions并不符合经典SShs / WAP之间拟议的早期研究中,一方面表明,海峡Bransfield并不强大的生物地理屏障,对于红藻和另一方面,当前的势头,并从冰盖中起到了决定性的作用,组件的当前红藻的分布。最后,我们的工作建立了一个与标本采集植物标本室相关的遗传数据库,并将支持未来更好地了解研究区域红藻群落的多样性和分布的工作。= =地理= =根据美国人口普查,该地区的总面积为,其中土地和(2.641平方公里)水。利用分子分类学作为传统分类学的补充工具,我们研究了西南极半岛(WAP)和南设得兰群岛(SShs)沿岸和跨水深梯度的红色大型藻类多样性和生物地理学;此外,我们还比较了两种鉴定方法的准确性和观察到的比率数量。我们的结果显示,在区域和地方尺度上的多样性水平很低,总共记录了大约50个类群。= =地理= =根据美国人口普查,这个县的面积为,其中土地面积为,其中土地面积为。我们的研究结果还使我们能够确定三个不同生物地理子区域的大藻红组合之间的显著差异:WAP的SShs和北部部分(at≈63°S)、WAP的中部部分(at≈64°S)和WAP的中南部部分(at≈67°S)。Our sub-regions do not to the”,相当于分离SShs / WAP in前人权研究所与选择》that the Bransfield海峡is not a strong地理隔离for red macroalgae。由于我们的三个次区域对应三个纬度水平,我们认为过去和现在的海冰扰动动态可能影响了观察到的红藻群落的差异。我们认为,在本工作中建立与代金券标本相关的可访问遗传数据集将有利于今后对该区域大型藻类多样性和分布的研究。
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