scholarly journals Diatom diversity and distribution in Madeira Island streams (Portugal)

2020 ◽  
Vol 8 ◽  
Author(s):  
Catarina Ritter ◽  
Pedro Raposeiro ◽  
Vítor Gonçalves
Keyword(s):  
New Records ◽  
Distribution Patterns ◽  
Diatom Species ◽  
Diatom Assemblages ◽  
Field Campaign ◽  
Madeira Island ◽  
Madeira Archipelago ◽  
Freshwater Diatoms ◽  
Freshwater Diatom

Here, we present the data obtained from the samples collected in a field campaign during the spring of 2015 which aims for a better understanding of the diversity and distribution patterns of freshwater diatoms in Madeira Island. Following European and Portuguese standards and recommendations for routine diatom sampling and analysis, we collected samples in 40 sites, distributed in 27 permanent streams and identified the diatom species present, using general diatom floras and studies in Portuguese freshwater diatoms. Little is known about the diversity and distribution of freshwater diatom assemblages from Madeira Archipelago. This study reports a survey in 40 sites in Madeira Island distributed in 27 permanent streams. A total of 965 diatom (Bacillariophyta) occurrences were recorded, belonging to 130 different taxa from 44 genera and 27 families. The families with the highest number of occurrences were Bacillariaceae (176), Achnanthidiaceae (135) and Naviculaceae (133). The two diatom endemisms, described previously in Madeira Island (Lange-Bertalot 1993), Nitzschia macaronesica Lange-Bertalot and Navicula madeirensis Lange-Bertalot, were only observed in a small number of sites, located mostly at Laurissilva forest. Sixty species are new records, not only to Madeira Island, but also to the Madeira Archipelago.

scholarly journals Taxonomic Studies on Some Freshwater Diatoms from the Eastern Terai Region, Nepal

Our Nature ◽  
1970 ◽  
Vol 4 (1) ◽  
pp. 10-19 ◽  
Author(s):  
S. K. Rai
Keyword(s):  
Key Words ◽  
New Records ◽  
Diatom Species ◽  
Cyclotella Meneghiniana ◽  
Freshwater Diatoms ◽  
Taxonomic Studies ◽  
Freshwater Diatom

The present paper describes the morphology and distribution of 17 freshwater diatom species (Bacillariophyceae) collected from rivers, ponds, ditches and wetlands of the eastern Terai region, Nepal. They belong to the genera Cyclotella (1), Ceratoneis (1), Fragilaria (1), Eunotia (1), Navicula (3), Pinnularia (1), Gyrosigma (1), Gomphonema (2), Cymbella (3), Epithemia (1), and Hantzschia (2). Cyclotella meneghiniana Kuetz., Ceratoneis arcus (Ehr.) Kuetz., Fragilaria capucina Desmaz. var. mesolepta Rabenh., Eunotia lunaris (Ehr.) Grun., Navicula perrotettii Grun., Gomphonema lanceolatum fo. turris (Ehr. c.p.) Hust., and Cymbella tumida (Bréb.) Van. Heurck have previously been reported from the eastern Terai region but Navicula radiosa Kuetz., Gyrosigma kuetzingii (Grun.) Cl., Gomphonema sphaerophorum Ehr., Cymbella aspera (Ehr.) Cl, and Hantzschia amphioxys (Ehr.) Grun. var. capitata Muell. are new records for this area. Navicula gastrum Ehr., Pinnularia viridis (Nitzs.) Ehr. var. intermedia Cl., Cymbella reinhardtii Grun., Hust., Epithemia sorex Kuetz. and Hantzschia virgata (Roper) Grun. are new records for Nepal. Key words: Algae, Bacillariophyceae, freshwater diatoms, Terai, Nepal doi:10.3126/on.v4i1.498 Our Nature Vol.4(1) 2006 pp10-19

scholarly journals The structure and diversity of freshwater diatom assemblages from Franz Josef Land Archipelago: a northern outpost for freshwater diatoms

PeerJ ◽  
2016 ◽  
Vol 4 ◽  
pp. e1705 ◽  
Author(s):  
Sergi Pla-Rabés ◽  
Paul B. Hamilton ◽  
Enric Ballesteros ◽  
Maria Gavrilo ◽  
Alan M. Friedlander ◽  
...  
Keyword(s):  
Seasonal Changes ◽  
Ph Gradient ◽  
Diatom Assemblages ◽  
Diatom Flora ◽  
Human Footprint ◽  
Franz Josef Land ◽  
Freshwater Diatoms ◽  
Arctic Conditions ◽  
Cell Densities ◽  
Freshwater Diatom

We examined diatom assemblages from 18 stream and pond samples in the Franz Josef Land Archipelago (FJL), the most northern land of Eurasia. More than 216 taxa were observed, revealing a rich circumpolar diatom flora, including many undescribed taxa. Widely distributed taxa were the most abundant by cell densities, while circumpolar taxa were the most species rich. Stream and pond habitats hosted different assemblages, and varied along a pH gradient.Diatoma tenuiswas the most abundant and ubiquitous taxon. However, several circumpolar taxa such asChamaepinnularia gandrupii, Cymbella botellus, Psammothidiumsp. andHumidophila laevissimawere also found in relatively high abundances. Aerophilic taxa were an important component of FJL diatom assemblages (Humidophilaspp.,Caloneisspp. andPinnulariaspp.), reflecting the large and extreme seasonal changes in Arctic conditions. We predict a decrease in the abundance of circumpolar taxa, an increase in local (α-) freshwater diatom diversity, but a decrease in regional diversity (circumpolar homogenization) as a result of current warming trends and to a lesser extent the increasing human footprint in the region.

scholarly journals Diatoms from small ponds and terrestrial habitats in Deserta Grande Island (Madeira Archipelago)

2021 ◽  
Vol 9 ◽  
Author(s):  
Vítor Gonçalves ◽  
Catarina Ritter ◽  
Helena Marques ◽  
Dinarte Teixeira ◽  
Pedro Raposeiro
Keyword(s):  
New Records ◽  
Species Level ◽  
Biodiversity Assessment ◽  
Diatom Species ◽  
Madeira Archipelago ◽  
Natural Reserve ◽  
Freshwater Biota ◽  
Terrestrial Habitats

Freshwater diversity, and diatoms in particular, from Desertas Islands (Madeira Archipelago, Portugal) is poorly known, although the Islands are protected and became a Natural Reserve in 1995. During two field expeditions in 2013 and 2014 to Deserta Grande Island, several freshwater and terrestrial habitats were sampled. The analysis of these samples aims to contribute to the biodiversity assessment of the freshwater biota present in Deserta Grande Island. Here, we present the diatom diversity in Deserta Grande Island resulting from that survey. This study contributes to improve the knowledge of Madeira Archipelago freshwater diversity, particularly in the Desertas sub-archipelago. To our knowledge, we present the first diatom data for the Desertas sub-archipelago. This work resulted in a list of 60 diatom taxa for Deserta Grande, from which 57 were identified to species level. From the 60 new records for Desertas sub-archipelago, 30 of them were also new records for Madeira Archipelago. Several specimens could not be assigned to a known species and may be new diatom species not yet described.

Halamphora daochengensis sp. nov., a new freshwater diatom species (Bacillariophyceae) from a small mountain lake, Sichuan Province, China

Phytotaxa ◽  
2019 ◽  
Vol 404 (1) ◽  
pp. 12 ◽  
Author(s):  
WEI ZHANG ◽  
TING WANG ◽  
ZLATKO LEVKOV ◽  
INGRID JÜTTNER ◽  
LUC ECTOR ◽  
...  
Keyword(s):  
New Species ◽  
Nature Reserve ◽  
Sichuan Province ◽  
Mountain Lake ◽  
Morphological Description ◽  
Similar Species ◽  
Dorsal Margin ◽  
Diatom Species ◽  
Freshwater Diatoms ◽  
Freshwater Diatom

During a survey of freshwater diatoms from a mountain lake, Lake Congqiancuo, Haizishan Nature Reserve, Yading, Daocheng County, Sichuan Province, China, a new Halamphora species, Halamphora daochengensis sp. nov. was found. A detailed morphological description of the new species is presented, based on light and scanning electron microscopy. The main features of H. daochengensis are dorsiventral, semi-lanceolate valves with a strongly triundulate dorsal margin and valve ends distinctly protracted and capitate. The new species is compared with other similar species including Halamphora dusenii and H. normanii var. undulata which differ in size, valve shape, stria density and ultrastructure.

scholarly journals New records of phytoseiid mites (Acari: Mesostigmata) from Madeira Island

Acarologia ◽  
2021 ◽  
Vol 61 (2) ◽  
pp. 217-240
Author(s):  
Serge Kreiter ◽  
Martial Douin ◽  
Marie Stephane Tixier
Keyword(s):  
North Atlantic ◽  
New Records ◽  
North Atlantic Ocean ◽  
Phytoseiid Mites ◽  
Madeira Island ◽  
The North ◽  
Madeira Archipelago ◽  
The North Atlantic ◽  
South Portugal ◽  
Mite Family

Madeira is the largest of the four islands constituting Madeira Archipelago in the North Atlantic Ocean. It is located at 400 km from the Northern Canary Islands, at 500 km from Morocco and between 900 and 1000 km from South Portugal and Spain. So far, nineteen species of the mite family Phytoseiidae had been reported from this island. We report in this paper the results of a survey conducted in May 2019 in Madeira Island, in which 15 species have been found, six being new for the Island fauna.

scholarly journals Gomphonema svalbardense sp. nov., a new freshwater diatom species (Bacillariophyta) from the Arctic Region

Phytotaxa ◽  
2014 ◽  
Vol 170 (4) ◽  
pp. 250 ◽  
Author(s):  
Eveline Pinseel ◽  
Katerina Kopalova ◽  
Bart Van de Vijver
Keyword(s):  
Central Area ◽  
Arctic Region ◽  
The Arctic ◽  
Similar Species ◽  
New Taxon ◽  
Diatom Species ◽  
Svalbard Archipelago ◽  
Freshwater Diatoms ◽  
Freshwater Diatom ◽  
The Arctic Region

During a survey of freshwater diatoms from lakes in the region of Petuniabukta on Spitsbergen (Svalbard Archipelago) a new Gomphonema species, G. svalbardense sp. nov., has been recorded. The new taxon was previously cited in the literature as G. angustatum var. undulatum but this identification proved to be erroneous. Detailed morphology description of G. svalbardense based on light and scanning electron microscopy is presented in this paper and the morphological features of the taxon have been compared with similar species. Gomphonema svalbardense is characterized by its typical linear, almost naviculoid outline with undulating margins, with clearly inflated central part,  asymmetric central area, lateral raphe with simple straight proximal endings and the weakly radiate striae. History, ecology and biogeography of the species, mainly based on literature data, have been included.

scholarly journals Aquatic Hyphomycetes from streams on Madeira Island (Portugal)

2020 ◽  
Vol 8 ◽  
Author(s):  
Pedro Raposeiro ◽  
Hélder Faustino ◽  
Verónica Ferreira ◽  
Vítor Gonçalves
Keyword(s):  
New Records ◽  
Aquatic Hyphomycetes ◽  
Heterogeneous Group ◽  
Madeira Island ◽  
Worldwide Distribution ◽  
Madeira Archipelago ◽  
Biogeographic Region ◽  
Forest Streams ◽  
First Time ◽  
Flowing Well

Aquatic hyphomycetes are a phylogenetically heterogeneous group of fungi living preferentially in fast flowing, well-aerated forest streams. These fungi have worldwide distribution, but with the exception of Articulospora tetracladia, no aquatic hyphomycete taxon was previously recorded on Madeira Island. Aquatic hyphomycetes were sampled from 40 sites, distributed by 27 permanent streams in 2015, to provide the distribution of aquatic hyphomycetes in Madeira Island streams. In this study, a total of 21 species of aquatic hyphomycetes were recorded belonging to three classes of Ascomycota. All taxa are new records for Madeira Archipelago, except Articulospora tetracladia and four are reported for the first time in Macaronesian biogeographic region.

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