V. Notes on some Collections made from Furnas Lake, Azores, containing Algae and a few other Organisms.

Archer, W. Andrew

doi:10.1111/j.1095-8339.1874.tb00319.x

Cited by 12 publications

(7 citation statements)

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“…Cyanobacteria studies in the Azores have been reported since 1874 [48], mainly from freshwater habitats (e.g., [5,8,13]) with only a few references to terrestrial and thermal environments [13] despite the abundance of thermal habitats in these islands [12]. With this work, we report 11 genera that have not been identified in the Azores archipelago following the published checklist by Luz [13], namely, Cyanobacterium, Fischerella, Westiellopsis, Goleter, Isocystis, Scytonematopsis, Tychonema, Arthrospira, Stenomitos, Pegethrix and Tildeniella here reported for the first time in the Azores.…”

Section: Discussionmentioning

confidence: 99%

“…In the Azores, a remote Atlantic Ocean archipelago of volcanic origin, the study of cyanobacteria on different types of ecosystems is also biased. Although cyanobacteria have been reported in these islands since 1874 [5,6], most reports are from freshwater lakes (e.g., [5,[7][8][9]), due to high abundance of these ecosystems (88) [10] and to the occurrence of cyanobacteria blooms associated with lake cultural eutrophication [8,11]. Despite the abundance of thermal sites [12] and other environments suitable for cyanobacteria inhabitance [13], only a few studies on cyanobacteria diversity in these habitats were done [9,13].…”

Section: Introductionmentioning

confidence: 99%

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Cyanobacteria Phylogenetic Studies Reveal Evidence for Polyphyletic Genera from Thermal and Freshwater Habitats

et al. 2020

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Cyanobacteria are among the most diverse morphological microorganisms that inhabit a great variety of habitats. Their presence in the Azores, a volcanic archipelago of nine islands in the middle of the North Atlantic Ocean, has already been reported. However, due to the high diversity of cyanobacteria habitats, their biodiversity is still understudied, mainly in extreme environments. To address this, a total of 156 cyanobacteria strains from Azores lakes, streams, thermal and terrestrial habitats were isolated. Identification was made based on a polyphasic approach using classical taxonomy (morphological characteristics and environmental data) and phylogeny among 81 strains assessed by maximum likelihood and Bayesian analysis of 16S rDNA partial sequences. The 156 isolates showed a high genera diversity (38) belonging to the orders Chroococcales, Nostocales, Oscillatoriales, and Synechococcales. Eleven new genera for the Azores habitats are here reported, reinforcing that cyanobacteria biodiversity in these islands is still much understudied. Phylogenetic analysis showed 14 clusters associated with these cyanobacteria orders, with evidence for six new genera and valuable information towards Microchaete/Coleospermum taxonomic revision that better reflects species environmental distribution. These results emphasize the need for cyanobacteria taxonomy revisions, through polyphasic studies, mainly in Synechococcales order and in the Microchaete/Coleospermum, Nostoc, and Anabaena genera.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cyanobacteria Phylogenetic Studies Reveal Evidence for Polyphyletic Genera from Thermal and Freshwater Habitats

et al. 2020

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“…Later, with the Challenger expedition that took place from 1872 to 1876 and which had a brief passage to São Miguel Island, the Irish naturalist Archer ( Archer 1874 ) studied samples from Lake Furnas and reported six new taxa. By the end of the nineteenth century, Gerne (1888) and Barrois (1896) published several papers on freshwater biota of the Azores including some additions to testate amoebae fauna (Table 1 ).…”

Section: Introductionmentioning

confidence: 99%

Distribution of testate amoebae in bryophyte communities in São Miguel Island (Azores Archipelago)

Souto¹,

Gonçalves²,

Pontevedra-Pombal³

et al. 2021

BDJ

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Testate amoebae are a polyphyletic group of protists living preferentially in soils, freshwaters and wetlands. These Protozoa have a worldwide distribution, but their presence and diversity in the Azores (a remote oceanic archipelago) is poorly known, with only twelve taxa recorded so far. The published information reflects occasional collections from sporadic field visits from naturalists to São Miguel Island, mainly in the nineteenth century. To overcome this limitation, a standardised survey was carried out on the Island, sampling different types of habitats from several localities to provide the distribution and information on species ecology of testate amoebae. In this study, 43 species of testate amoebae were recorded (within a total of 499 occurrences), belonging to two orders of Protista (26 Arcellinida and 17 Euglyphida). The most frequently occurring testate amoebae were Euglypha strigosa, Trinema lineare, Euglypha rotunda, Assulina muscorum and Cyclopyxis eurystoma. The most diverse genus was Euglypha (six species). A total of 38 species are new records for the Azores Archipelago. These data help to improve knowledge of the geographical distribution of testate amoebae in the northern hemisphere and their diversity in the Azores Archipelago.

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“…As it is observed worldwide [32][33][34][35], eutrophication in the Azorean lakes has led to the increase of cyanobacteria abundance and the formation of cyanoHABs [30,35,36]. References to the presence of cyanobacteria in the Azores date back to the late Nineteenth century [37][38][39], but the current knowledge on their distribution and ecology is still limited [35,36], and even less is known about the presence of toxigenic strains in the Azorean lakes [7,30,40,41]. Considering that several species known from the literature as producers of MC, STX, ATX-a, and CYN, such as Aphanizomenon gracile [42], Microcystis aeruginosa [43], and Raphidiopsis curvata [44], were found in the Azores lakes [45], the presence of toxigenic strains and/or cyanotoxins should be further investigated, in order to determine the present risk in these waters.…”

Section: Introductionmentioning

confidence: 99%

Distribution of Toxic Cyanobacteria in Volcanic Lakes of the Azores Islands

Cordeiro

Luz

Vilaverde

et al. 2020

Water

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Eutrophication and global climate change gather advantageous conditions for cyanobacteria proliferation leading to bloom formation and cyanotoxin production. In the Azores, eutrophication is a major concern, mainly in lakes where fertilizers and organic matter discharges have increased nutrient concentration. In this study, we focused on understanding the influence of environmental factors and lake characteristics on (i) cyanobacteria diversity and biomass and (ii) the presence of toxic strains and microcystin, saxitoxin, anatoxin-a, and cylindrospermopsin cyanotoxin-producing genes. Fifteen lakes from the Azores Archipelago were sampled seasonally, environmental variables were recorded in situ, cyanobacteria were analyzed with microscopic techniques, and cyanotoxin-producing genes were targeted through conventional PCR. Statistical analysis (DistLM) showed that lake typology-associated variables (lake’s depth, area, and altitude) were the most explanatory variables of cyanobacteria biomass and cyanotoxin-producing genes presence, although trophic variables (chlorophyll a and total phosphorus) influence species distribution in each lake type. Our main results revealed higher cyanobacteria biomass/diversity, and higher toxicity risk in lakes located at lower altitudes, associated with deep anthropogenic pressures and eutrophication scenarios. These results emphasize the need for cyanobacteria blooms control measures, mainly by decreasing anthropogenic pressures surrounding these lakes, thus decreasing eutrophication. We also highlight the potential for microcystin, saxitoxin, and anatoxin-a production in these lakes, hence the necessity to implement continuous mitigation protocols to avoid environmental and public health toxicity events.

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V. Notes on some Collections made from Furnas Lake, Azores, containing Algae and a few other Organisms.

Cited by 12 publications

References 0 publications

Cyanobacteria Phylogenetic Studies Reveal Evidence for Polyphyletic Genera from Thermal and Freshwater Habitats

Cyanobacteria Phylogenetic Studies Reveal Evidence for Polyphyletic Genera from Thermal and Freshwater Habitats

Distribution of testate amoebae in bryophyte communities in São Miguel Island (Azores Archipelago)

Distribution of Toxic Cyanobacteria in Volcanic Lakes of the Azores Islands

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