Rotifera from Australian inland waters. I. Bdelloidea (Rotifera : Digononta)

1986 ◽  
Vol 37 (6) ◽  
pp. 765 ◽  
Author(s):  
W Koste ◽  
RJ Shiel
Keyword(s):  
Algal Blooms ◽  
Open Water ◽  
Common Species ◽  
Morphological Features ◽  
Frequent Occurrence ◽  
Inland Waters ◽  
Taxonomic Significance ◽  
Systematic Revision ◽  
Bdelloid Rotifers ◽  
The Common

In this paper, the first of a series providing a systematic revision of all Rotifera now known from Australian inland waters, the common bdelloid rotifers are reviewed. The group is epiphytic or epibenthic in habit, but some species commonly occur in open water of billabongs, lakes and rivers, particularly in association with algal blooms. Frequent occurrence of bdelloids in plankton collections necessitates diagnostic keys to their identification. For the common species only, morphological features of taxonomic significance are described and figured to facilitate further study.

Consumption of cyanobacteria by freshwater zooplankton: Implications for the success of 'top-down' control of cyanobacterial blooms in Australia

1994 ◽  
Vol 45 (5) ◽  
pp. 875 ◽  
Author(s):  
PI Boon ◽  
SE Bunn ◽  
JD Green ◽  
RJ Shiel
Keyword(s):  
Northern Hemisphere ◽  
Algal Blooms ◽  
Trophic Structure ◽  
Cyanobacterial Blooms ◽  
Inland Waters ◽  
Calanoid Copepods ◽  
Top Down ◽  
Fresh Waters ◽  
Toxic Cyanobacteria ◽  
The Common

Two main approaches have been mooted for the management of fresh waters to prevent or control cyanobacterial blooms: a 'bottom-up' approach in which the supply of essential nutrients is restricted, and a 'top-down' or 'biomanipulation' approach in which attempts are made to restructure the food web to maximize consumption of noxious cyanobacteria by herbivorous zooplankton. In this review, the published literature is examined to gauge whether the common zooplankton of Australian fresh waters have the capacity to control cyanobacterial blooms, especially of toxic forms, and thus whether the biomanipulation approach might be applied successfully in Australia. As zooplankton assemblages in Australian inland waters are quite different in composition from those of the Northern Hemisphere, they are unlikely to respond to manipulations of trophic structure in a similar way. The most common zooplankters in Australian inland waters, calanoid copepods and rotifers, have less potential for controlling cyanobacterial blooms than do large cladocerans. The latter are common in the Northern Hemisphere and are considered requisite for the control of cyanobacterial blooms. Toxic cyanobacteria, which cause the most severe environmental problems, have well documented detrimental effects on zooplankton. The few reports of zooplankton grazing on cyanobacteria in Australian fresh waters do not indicate that native zooplankton can consume noxious cyanobacteria at the rates required for control of algal blooms. There may, therefore, be grounds for strong reservations about the likely success of programmes proposed to control cyanobacterial blooms by the manipulation of trophic structure in Australian fresh waters.

EVALUATION OF THE COMMON HOP VARIETY SAMPLES ACCORDING TO THE PHENOLOGICAL AND MORPHOLOGICAL FEATURES

2018 ◽  
pp. 40-42 ◽  
Author(s):  
А. А. Fadeev ◽  
Z. А. Nikonova
Keyword(s):  
Morphological Characteristics ◽  
Economic Importance ◽  
Morphological Features ◽  
High Yield ◽  
Early Maturity ◽  
Foreign Countries ◽  
Humulus Lupulus L ◽  
The Common ◽  
Regions Of Russia ◽  
Vegetative Season

The results of study of the 12 year cycle of studies on the only in Russia collection of hops ordinary (Humulus lupulus L.), which contains 250 samples from different regions of Russia and 17 foreign countries. The number of process varieties, composition and origin, it is unique and corresponds to world level. A collection of accessions of hops is a population of female plants with a set of phenological, morphological and economic importance of signs. In the article, the estimation of the collectible varieties of hops at different ripeness groups according to phenological and morphological characteristics according to the method of test for distinctness, uniformity and stability. As the result of the research the Common Hop (Humuluslupulus) sorts were classified in accordance with their maturity time as early maturity (less than 100 days) – 10%, middle-early (101…110 days) – 14, middle duration (111…120 days) – 40, middle-late (121…130 days) – 10% and slow-maturing (more than 130 days) – 26%. Each group has a phenotypic and morphologies features. The early maturity, middle-early and middle duration varieties with vegetative season approximately 120 days are more adaptive to the conditions of the Chuvashia and central part of the Russia and provide obtaining high yield of the hop cones.

Marine tube-dwelling diatoms of eastern Canada: descriptions, checklist, and illustrated key

1984 ◽  
Vol 62 (4) ◽  
pp. 778-794 ◽  
Author(s):  
Christopher S. Lobban
Keyword(s):  
New Species ◽  
Northwest Territories ◽  
Common Species ◽  
Bay Of Fundy ◽  
Eastern Canada ◽  
Lawrence Estuary ◽  
The Common ◽  
Living Material ◽  
St Lawrence Estuary ◽  
A New Species

From a study of living materials and specimens in several regional herbaria, a list has been drawn up of all the common and several of the rarer tube-dwelling diatoms of eastern Canada. Descriptions, illustrations of living material and acid-cleaned valves, and a key to the species are provided. Most specimens were from the Atlantic Provinces and the St. Lawrence estuary, but a few were from the Northwest Territories. By far the most common species is Berkeleya rutilans. Other species occurring commonly in the Quoddy Region of the Bay of Fundy, and sporadically in space and time elsewhere, arc Navicula delognei (two forms), Nav. pseudocomoides, Nav. smithii, Haslea crucigera, and a new species, Nav.rusticensis. Navicula ramosissima and Nav. mollis in eastern Canada are usually found as scattered cohabitants in tubes of other species. Nitzschia tubicola and Nz. fontifuga also occur sporadically as cohabitants.

scholarly journals Ecology of sandflies (Diptera: Psychodidae) in a restricted focus of cutaneous leishmaniasis en Northern Venezuela: I. Description of the study area, catching methods and species composition

1987 ◽  
Vol 82 (1) ◽  
pp. 119-124 ◽  
Author(s):  
M. Dora Feliciangeli
Keyword(s):  
Species Composition ◽  
Cutaneous Leishmaniasis ◽  
Relative Abundance ◽  
Rare Species ◽  
Common Species ◽  
Term Study ◽  
Phlebotomine Sandfly ◽  
Phlebotomine Sandflies ◽  
The Common ◽  
Catching Methods

A study on the ecology of phlebotomine sandfly fauna in a restricted focus of cutaneous leishmaniasis in northern Venezuela was undertaken in order to investigate the species responsible for the transmission. The study area and catching methods for phlebotomine sandflies are described. A total of 9,061 females and 1,662 males were collected during a year-term study. 12 species of Lutzomya and 1 species of Brumptomya sp. were identified. Absolute and relative abundance and ocurrence for each species were determined. The rel ative occurrence allowed to distinguish the common species, viz. L. panamensis, L. ovallesi, L. gomezi, L. tinidadensis, L. atroclavata, L. cayennensis, L. shannoni and L. olmeca bicolor from the rare species vis., L. punctigeniculata, L. rangeliana, L. evansi and L. dubitans. General comments on the species composition of the sandfly fauna in this locality are made.

scholarly journals Helminth fauna of Microtus cf. arvalis (Rodentia, Cricetidae) in Russia and adjacent countries

2020 ◽  
Vol 21 (5) ◽  
Author(s):  
NADEZHDA Yu. KIRILLOVA ◽  
Alexander Kirillov ◽  
ALEXANDER B. RUCHIN ◽  
MAXIM V. TRUKHACHEV
Keyword(s):  
Common Vole ◽  
Common Species ◽  
Final Host ◽  
Helminth Fauna ◽  
Helminth Species ◽  
Research Areas ◽  
The Common ◽  
Common Voles ◽  
Paratenic Hosts ◽  
Parasitic Worms

Abstract. Kirillova NYu, Kirillov AA, Ruchin AB, Trukhachev MV. 2020. Helminth fauna of Microtus cf. arvalis (Rodentia, Cricetidae) in Russia and adjacent countries. Biodiversitas 21: 1961-1979. The helminth fauna of voles of the Microtus cf. arvalis group is reviewed focusing on the Russian fauna and that of adjacent territories. In total, 61 helminth species have been recorded in these rodents: Trematoda-14, Cestoda-21, Nematoda-25, Acanthocephala-1. The diversity of the helminth community of the common vole is due to the wide species range and abundance of this rodent. M. arvalis is the final host for most of the parasites recorded from this host species. Only 10 cestodes and trematodes species use common voles as intermediate and paratenic hosts. The core of this voles’ helminth fauna is formed by common species that parasitize many different rodent species. The helminth fauna of the common vole has been most intensively studied in Russia, where 45 species of parasitic worms have been recorded in rodents. The similarity of the helminth fauna of the common vole from different study regions is determined by both the geographical proximity of the research areas and the broad distribution of most of the M. cf. arvalis helminth species.

A STUDY ON CHROMOBLASTOMYCOSIS IN A TERTIARY CARE HOSPITAL (DMCH), LAHERIASARAI, BIHAR

2021 ◽  
pp. 36-38
Author(s):  
Jibachh Prasad Sah ◽  
Pramanand Jha ◽  
R. S. Prasad ◽  
Debarshi Jana
Keyword(s):  
Tertiary Care Hospital ◽  
Tertiary Care ◽  
Common Species ◽  
Care Hospital ◽  
Dematiaceous Fungi ◽  
Himalayan Belt ◽  
Common Clinical Presentation ◽  
Nodular Lesions ◽  
The Common ◽  
Causative Fungus

Background: Chromoblastomycosis, a chronic subcutaneous mycosis, is caused by several dematiaceous Fungi, the most common being Fonsecaea pedrosoi. A majority of cases from India have been reported from the sub-Himalayan belt and South India. Aim: The aim was to study chromoblastomycosis in around Darbhanga reason of Bihar including demographic and clinicomycological prole. Materials and Methods: This report is a retrospective hospital record-based analysis of all cases of chromoblastomycosis who presented to the dermatology outpatient department of our tertiary care hospital during the past 3 years. Results : A total of 11 cases of chromoblastomycosis were diagnosed during the above period. The disease was seen predominantly in middle-aged male. The lower extremity (72.7%) was more commonly affected. Verrucous and nodular lesions are the common clinical presentation. Sclerotic bodies are demonstrated in potassium hydroxide mount and histopathological section in 81.8% and 90.9% cases, respectively. The causative fungus was isolated in 90.9% and cass with F. pedrosoi, as the most common species

scholarly journals VII. – Fungi

1879 ◽  
Vol 168 ◽  
pp. 93-94
Keyword(s):  
Frequent Occurrence ◽  
The Other ◽  
Single Specimen ◽  
Kerguelen Island ◽  
The Common ◽  
Time Of Year

[The Fungi collected in Kerguelen Island amount to 9 or 10 (the tenth being still an undetermined form). Dr. Hooker obtained 2 species in the winter (May and June) 1840; Mr. Moseley 3 in addition to the same, during summer (December and January) 1873-4; Mr. Eaton, also in summer, 5 determinable species, and 1 that could not be identified ( see footnote), besides the species found by Dr. Hooker. Until a few days before Midsummer ( i. e. Christmas) no Fungi were seen in the vicinage of the English Observatory Bay. The first to appear was the common mushroom, a single specimen of which was found on an island in the sound by some officers from H. M. S. “Volage.” Later in the summer the other four species came up in a few places on the mainland. They were not by any means of frequent occurrence, and probably scarcely any of them would be found at the time of year corresponding with the date of Dr. Hooker’s visit to the island.— A. E. Eaton. ]

Low phytoplankton biomass and ice algal blooms in the Weddell Sea during the ice-filled summer of 1997

2002 ◽  
Vol 14 (3) ◽  
pp. 231-243 ◽  
Author(s):  
ELSE N. HEGSETH ◽  
CECILIE H. VON QUILLFELDT
Keyword(s):  
Algal Blooms ◽  
Phytoplankton Bloom ◽  
Open Water ◽  
Weddell Sea ◽  
Ice Algae ◽  
Ice Shelf ◽  
Growth Season ◽  
Pack Ice ◽  
Phaeocystis Antarctica ◽  
Upper Mixed Layer

The summer of 1997 was characterized by unusually large amounts of pack ice in the southeastern Weddell Sea, and less than 10% of the area that is commonly ice-free in summer was open. A modest phytoplankton bloom developed in the upper mixed layer in the northernmost area (72°S). The bloom peaked in mid-February with max chlorophyll concentrations of 1.5 μg l−1, and integrated stocks of 55–60 mg m−2. Autotrophic flagellates dominated the biomass (80–90% of the chlorophyll) at first, while diatoms increased relative to flagellates during the bloom. Nutrient deficits, however, indicated that a much larger biomass was produced than was observed. Freezing starting after mid-February probably terminated the bloom, resulting in a pelagic growth season limited in time (less than two months) and space. The sea ice had a distinct brown layer of algae, usually at 1–2 m depth, with average chlorophyll biomass of 10.3 mg m−2. The ice cover exhibited a substantial amount of ridges, with ice algae growing in cavities and other structures, but with lower biomass than in the bands. Ice algae were also found growing on the lower 2 m of the ice shelf (visible at low tide). The overall growth season in the ice lasted several months, and ice algal production may have exceeded pelagic production in the Weddell Sea during the growth season of 1997. Pennate diatoms, like Fragilariopsis curta and F. cylindrus, dominated both in ice and in open water above the pycnocline, while Phaeocystis antarctica dominated in deeper layers and in crack pools. Euphausiids, particularly young stages, were frequently observed grazing on ice algae in ridges and on all sides of the floes, (confirmed by the gut content). Ice algae would thus have served as an ample food supply for the krill in the summer of 1997.

Late Cretaceous (Maastrichtian) crocodyliforms from north-eastern Iberia: a first attempt to explain the crocodyliform diversity based on tooth qualitative traits

2019 ◽  
Vol 189 (2) ◽  
pp. 584-617 ◽  
Author(s):  
Alejandro Blanco ◽  
Eduardo Puértolas-Pascual ◽  
Josep Marmi ◽  
Blanca Moncunill-Solé ◽  
Sergio Llácer ◽  
...  
Keyword(s):  
Late Cretaceous ◽  
Feeding Habits ◽  
Morphological Features ◽  
Taxonomic Significance ◽  
Environmental Preferences ◽  
Qualitative Traits ◽  
North Eastern

Abstract During recent years, knowledge about crocodyliform diversity of the uppermost Cretaceous from Europe has been substantially improved. Palaeontological efforts have also been focused on microvertebrate diversity and its palaeoecological implications. Isolated crocodylomorph teeth are, by far, one of the most frequently recovered elements in microvertebrate samples. In the present paper, morphological features of crocodylomorph teeth collected throughout the complete Maastrichtian series of the southern Pyrenean basin (north-eastern Spain), together with several mandibular remains, are described and analysed. Teeth were grouped in morphotypes and their taxonomic significance is discussed. The results highlight a diverse crocodylomorph assemblage in this area throughout the Maastrichtian. In addition, feeding habits and environmental preferences are inferred for the identified taxa according to dental features, occurrences and taphonomy.

scholarly journals Prevalence and Quantitation of Species C Adenovirus DNA in Human Mucosal Lymphocytes

2002 ◽  
Vol 76 (21) ◽  
pp. 10608-10616 ◽  
Author(s):  
C. T. Garnett ◽  
D. Erdman ◽  
W. Xu ◽  
Linda R. Gooding
Keyword(s):  
Magnetic Beads ◽  
Infectious Virus ◽  
Common Species ◽  
Pcr Assay ◽  
Viral Dna ◽  
Cell Purification ◽  
Frequent Finding ◽  
Persistent Virus ◽  
The Common ◽  
Tissue Specimens

ABSTRACT The common species C adenoviruses (serotypes Ad1, Ad2, Ad5, and Ad6) infect more than 80% of the human population early in life. Following primary infection, the virus can establish an asymptomatic persistent infection in which infectious virions are shed in feces for several years. The probable source of persistent virus is mucosa-associated lymphoid tissue, although the molecular details of persistence or latency of adenovirus are currently unknown. In this study, a sensitive real-time PCR assay was developed to quantitate species C adenovirus DNA in human tissues removed for routine tonsillectomy or adenoidectomy. Using this assay, species C DNA was detected in Ficoll-purified lymphocytes from 33 of 42 tissue specimens tested (79%). The levels varied from fewer than 10 to greater than 2 × 106 copies of the adenovirus genome/107 cells, depending on the donor. DNA from serotypes Ad1, Ad2, and Ad5 was detected, while the rarer serotype Ad6 was not. When analyzed as a function of donor age, the highest levels of adenovirus genomes were found among the youngest donors. Antibody-coated magnetic beads were used to purify lymphocytes into subpopulations and determine whether viral DNA could be enriched within any purified subpopulations. Separation of T cells (CD4/8- expressing and/or CD3-expressing cells) enriched viral DNA in each of nine donors tested. In contrast, B-cell purification (CD19-expressing cells) invariably depleted or eliminated viral DNA. Despite the frequent finding of significant quantities of adenovirus DNA in tonsil and adenoid tissues, infectious virus was rarely present, as measured by coculture with permissive cells. These findings suggest that human mucosal T lymphocytes may harbor species C adenoviruses in a quiescent, perhaps latent form.

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