Community structure of Harpacticoida and Canuelloida (Crustacea, Copepoda) on the Great Meteor Seamount (North-east Atlantic Ocean)

2019 ◽  
Vol 99 (06) ◽  
pp. 1325-1342 ◽  
Author(s):  
Karin Richter ◽  
Kai Horst George
Keyword(s):  
Community Structure ◽  
Atlantic Ocean ◽  
Shallow Water ◽  
Oceanic Islands ◽  
Species Level ◽  
North East ◽  
Analysis Of Similarity ◽  
Distribution Ranges ◽  
First Time ◽  
Great Meteor Seamount

AbstractDuring the expedition POS397 ‘GroMet’ in 2010 the sediments of the Great Meteor Seamount (GMS) plateau were sampled quantitatively for the first time, allowing statistical analysis of the community structure of Harpacticoida and Canuelloida. Analysis of similarity revealed no differences between three geographic regions at family/species level. Analysis of diversity indicated slightly greater diversity in the south, with more species belonging to more genera/families. Dispersal opportunities possibly occurring at the plateau (emergence, erosion, rafting) are discussed. Of 18 investigated families 106 species were identified, but only 5.66% were already scientifically known and widely distributed. Within the investigated families, 37.74% of the species belonged to shallow-water genera, leading to the conclusion that the plateau was once connected to shallow-water habitats, perhaps functioning as a stepping stone, but is now geographically isolated. This isolation is most likely due to seafloor spreading of the Atlantic Ocean and descending of the GMS. On the plateau, six species with wider distribution ranges were present, indicating that species may arrive accidentally, but their means of settlement remains unknown. Comparisons of the identified GMS plateau fauna with that of other seamounts and mid-oceanic islands revealed similar communities at family level, but at species level the GMS shares only one species with the Seine Seamount; all other elevations had more species in common. Hence, the GMS plateau is considered to be isolated regarding benthic Copepoda but may play an important role in meiofaunal species distribution, as it represents a shallow-water habitat within the deep sea.

scholarly journals Deep-sea holothurians (Echinodermata, Holothuroidea) from the Colombian Southern Caribbean Sea

Check List ◽  
2020 ◽  
Vol 16 (3) ◽  
pp. 535-551 ◽  
Author(s):  
Giomar H. Borrero-Pérez ◽  
Luisa F. Dueñas ◽  
Jorge León ◽  
Vladimir Puentes
Keyword(s):  
Atlantic Ocean ◽  
Deep Sea ◽  
Caribbean Sea ◽  
Species Level ◽  
Southern Caribbean ◽  
The Caribbean ◽  
First Time ◽  
Video Surveys

Fifteen morphotypes of deep-sea holothurians were documented by photography or videography at depths of 596–2,566 m, using Remote Operated Vehicles (ROV) video surveys and towed camera transects, during hydrocarbon exploratory activities in the Colombian Southern Caribbean. Most of the morphotypes were identified to the species level based on the images. The species belong to four orders, Apodida (1 species), Persiculida (3 species), Elasipodida (8 species), and Synallactida (3 species). Four species, three genera, and three families are reported for the first time in the Colombian Caribbean Sea. Some of the reports also represent first records for the Caribbean Sea and the Atlantic Ocean.

scholarly journals Community structure and metabolic potentials for biofuel production of an ancient beer starter ‘emao' revealed by a whole-metagenome study

2020 ◽  
Author(s):  
Diganta Narzary ◽  
Nitesh Boro ◽  
Ashis Borah ◽  
Okubo Takashi ◽  
Hideto Takami
Keyword(s):  
Community Structure ◽  
Biofuel Production ◽  
Lignocellulose Degradation ◽  
Functional Modules ◽  
North East India ◽  
North East ◽  
Eukaryotic Microorganisms ◽  
Mixed Microbial Cultures ◽  
Metagenome Sequencing ◽  
First Time

Abstract The community structure and functional metabolic modules occurring in ‘emao' – a traditional rice beer starter of ancient origin from north-east India has been unearthed for the first time using shot-gun whole-metagenome sequencing. Emao harbours potential microorganisms for saccharification, lignocellulose degradation, and biofuel production that correlate with probable metabolic functional modules. Eukaryotic microorganisms, especially moulds and yeasts, dominated over the prokaryotes in emao compared to previous metagenomic studies on such traditional starters where the relative abundance of prokaryotes was higher than the eukaryotes. The comprehensive microbial species diversity, community structure, and metabolic modules exhibited in emao would be practical in the formulation of mixed-microbial cultures for biofuel production from plant-based feedstocks.

Notes on a small collection of thecate hydroids (Cnidaria: Hydrozoa)from Tristan da Cunha, south Atlantic

Zootaxa ◽  
2010 ◽  
Vol 2336 (1) ◽  
pp. 1 ◽  
Author(s):  
HORIA R. GALEA
Keyword(s):  
Shallow Water ◽  
Morphological Variation ◽  
New Records ◽  
Present Report ◽  
Species Level ◽  
Present Species ◽  
Pilot Survey ◽  
Tristan Da Cunha ◽  
Small Collection ◽  
First Time

A pilot survey of the shallow-water, thecate hydroid fauna of Tristan da Cunha archipelago, was undertaken for the first time. The examination of the collected material revealed the presence of at least sixteen hydroids, of which three could not be identified to species level in the absence of fertile specimens. Two sympatric morphotypes, provisionally assigned to Halecium delicatulum Coughtrey, 1876, are described, along with a discussion on the astonishingly wide morphological variation attributed to this taxon. All the present species are illustrated, and some of them are either described or accompanied by brief remarks. Only twelve hydroids were previously reported from the study area and the present report adds eleven new records to the list of known species, bringing their number to twenty-three.

YUKAGIR GEOGRAPHICAL TERMS IN TOPONYMY OF THE KOLYMA RIVER BASIN

2020 ◽  
Vol 9 (4(73)) ◽  
pp. 29-33
Author(s):  
N.S. Bagdaryyn
Keyword(s):  
River Basin ◽  
Semantic Analysis ◽  
Comparative Method ◽  
Linguistic Analysis ◽  
Word Formation ◽  
Morphological Features ◽  
North East ◽  
The North ◽  
First Time ◽  
Kolyma River

The article continues the author's research on the toponymy of the North-East of the Sakha Republic, in particular the Kolyma river basin, in the aspect of the interaction of related and unrelated languages. The relevance of this work is defined in the description of local geographical terminology of Yukagir origin, as a valuable and important material in the further study of toponymy of the region. For the first time, the toponymy of the Kolyma river basin becomes the object of sampling and linguistic analysis of toponyms with local geographical terms of Yukagir origin in order to identify and analyze them linguistically. The research was carried out by comparative method, word formation, structural, lexical and semantic analysis. As a result of the research, phonetic and morphological features are revealed, the formation of local geographical terms and geographical names of Yukagir origin is outlined, and previously unrecorded semantic shifts and dialectisms are revealed. The most active in the formation of terms and toponyms is the geographical term iилil / eҕal 'coast‘, which is justified by the representation of the Yukagirs’ coast' home, housing

scholarly journals First Report of a Gall Midge Species (Diptera: Cecidomyiidae) Associated With Pistachios

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Farshid O Sirjani ◽  
Edwin E Lewis
Keyword(s):  
Gall Midge ◽  
Species Level ◽  
Plant Tissues ◽  
First Report ◽  
Branch Dieback ◽  
First Time ◽  
Level Identification

Abstract A new dipterous pest is reported, for the first time, on commercial pistachios from Sirjan, Kerman province, Iran. The genus of the insect was determined to be Resseliella Seitner (Diptera: Cecidomyiidae). Adults are light brown to brown in color and 0.8–1.5 mm in length with females, generally, slightly larger than males. Females have an elongated ovipositor, which is characteristic of the genus. Larvae are orange in color, 2–3 mm in length in the later instars, feed under bark without inducing galls, and cause branch dieback on trees of various ages. Brown to black discolorations are observed on plant tissues under bark where the larvae feed. Infestations observed on current and the previous—year’s growths, ranged from 0.5 to 1.2 cm in diameter, and all located in outer branches. Dry leaves and fruit clusters on infested branches remain attached, which may be used to recognize infestation by the gall midge. Dark-colored, sunken spots with splits on the bark located at the base of the wilted sections of the shoots also are symptoms of Resseliella sp. larval activity. Species-level identification of the gall midge is currently underway.

scholarly journals A review of cephalopods (Phylum: Mollusca) of the Canary Current Large Marine Ecosystem (Central-East Atlantic, African coast)

2021 ◽  
pp. 1-25
Author(s):  
Amanda Luna ◽  
Francisco Rocha ◽  
Catalina Perales-Raya
Keyword(s):  
North Atlantic ◽  
Atlantic Coast ◽  
Marine Ecosystem ◽  
Western Sahara ◽  
Guinea Bissau ◽  
Distribution Ranges ◽  
Large Marine Ecosystem ◽  
Sepiola Atlantica ◽  
First Time ◽  
Subsequent Identification

Abstract An extensive review of cephalopod fauna in the Central and North Atlantic coast of Africa was performed based on material collected during 10 research cruises in these waters. In the Canary Current Large Marine Ecosystem (CCLME) area, a total of 378,377 cephalopod specimens was collected from 1247 bottom trawl stations. Of those specimens, 300 were sampled for subsequent identification in the laboratory and found to belong to 65 different species and 23 families. After an exhaustive review of the existing literature on the cephalopods and new data obtained from the surveys, an updated checklist of 138 species was generated for the CCLME area. Our knowledge of the known geographic distribution ranges of several species has been expanded: Muusoctopus januarii has been sighted from Guinea–Bissau waters, passing through Western Sahara, to Morocco waters for the first time; Lepidoteuthis grimaldii and Octopus salutii have been sighted off Morocco waters for the first time; Austrorossia mastigophora, Abralia (Heterabralia) siedleckyi, Abralia (Pygmabralia) redfieldi and Sepiola atlantica have been cited off Western Sahara waters for the first time; Magnoteuthis magna, Abralia (Asteroteuthis) veranyi and Octopoteuthis megaptera have been sighted off Moroccan and Western Sahara waters for the first time; Ancistroteuthis lichtensteinii, Opisthoteuthis grimaldii, Onykia robsoni, Muusoctopus levis and Bathypolypus valdiviae have been cited in the Guinea–Bissau coast for the first time; the northern geographic limit of Bathypolypus ergasticus has been expanded to Morocco, Western Sahara and Mauritania and southward to Guinea–Bissau waters. The presence of Muusoctopus johnsonianus in Senegalese waters has been reported for the first time. A Chtenopteryx sicula specimen was reported in Western Sahara waters. A specimen belonging to the poorly known Cirrothauma murrayi species was found in South Moroccan waters. Amphitretus pelagicus, a probably cosmopolitan species, has been reported in the Western Sahara and Guinea–Bissau waters. Some species that were previously recorded in the area, Sepia angulata, Sepia hieronis, Heteroteuthis dagamensis, Helicocranchia joubini and Tremoctopus gelatus, were removed from the final checklist and considered to be not present in the CCLME area. Cycloteuthis akimushkini was substituted with Cycloteuthis sirventi, its senior synonym, in the final checklist. Similarly, Mastigoteuthis flammea and Mastigoteuthis grimaldii were substituted with Mastigoteuthis agassizii.

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