oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
New Virgulid Cercaria (Trematoda, Lecithodendroidea) from the Mollusk Melanopsis praemorsa (Melanopsidae) from Azerbaijan Water Bodies. Morphology and Chaetotaxy of Cercaria agstaphensis 11
A. A. Manafov
Vestnik Zoologii , 2011, DOI: 10.2478/v10058-011-0007-4
Abstract: An illustrated morphological description with chaetotaxy and differential diagnosis of the new form of virgulid cercaria — Cercaria agstaphensis 11 from freshwater prosobranchial mollusks Melanopsis praemorsa (Linnaeus, 1758) are given. Special attention is paid to the tegument armament, the structure of glandular apparatus, excretory system, digestive system, the structure of the sensory apparatus and other larval morphological characters.
New Virgulid Cercaria (Trematoda, Lecithodendroidea) from Freshwater Mollusk Melanopsis praemorsa (Melanopsidae) from Azerbaijan Water Bodies. Morphology and Chaetotaxy of Cercaria Agstaphensis 31
A. A. Manafov
Vestnik Zoologii , 2012, DOI: 10.2478/v10058-012-0001-5
Abstract: An illustrated morphological description with chaetotaxy and differential diagnosis of a new virgulid cercaria - Cercaria agstaphensis 31 from the freshwater prosobranchial mollusk Melanopsis praemorsa (Linnaeus, 1758) are given. Special attention is paid to the arming of the tegument, structure of the glandular apparatus, excretory system, digestive system, structure of the sensory apparatus and other larval morphological characters.
Population Structure and Shell Morphometrics of the Gastropod Theodoxus macri (Neritidae: Prosobranchia) from Azraq Oasis, Jordan  [PDF]
Ali Z. Elkarmi,Naim S. Ismail
Pakistan Journal of Biological Sciences , 2006,
Abstract: A total of 371 specimens of the freshwater gastropod Theodoxus macri (Sowerby, 1849) (Neritidae: Prosobranchia) from Azraq Oasis, Jordan, were studied for age, growth and shell morphometrics. The results show the life span to be four years. The mean observed lengths of the four age cohorts range from 3.295 to 7.707 mm. Theoretically, using Von Bertalanffy`s and Richard`s growth formulae, the maximum length of this snail may reach 17.187 and 12.930 mm, respectively. Shell and dry body weights averaged 44.4 and 36.05 mg, respectively. The relationships of the shell length to shell and dry body weights are curvilinear. However, the relationships of the shell length to shell width, aperture length and aperture width are linear. The relative coefficient (Kn) was 1.008 and 0.999 for young (age groups 1-2) and old (age groups 3-4) snails, respectively.
A Faunistic Survey of Cercariae from Fresh Water Snails: Melanopsis spp. and their Role in Transmission Diseases
A Farahnak,R Vafaie-Darian,I Mobedi
Iranian Journal of Public Health , 2006,
Abstract: Snail transmitted diseases are one of the major group of helminth parasitic diseases which have been established by trematode parasites. The larvae of trematodes (cercariae) use the snails as host. The purpose of the present study was to identify of cercariae released from Melanopsis spp. (M. doriae, M. costata, M. praemorsa, and M. nodosa) and evaluate their medical importance. Accordingly, 2, 266 Melanopsis spp. (fresh water snails) were collected from various agriculture canals in the central area of Khuzestan Province in the south west of Iran. 72 (3.1%) infected Melanopsis spp. snails were isolated and the cercariae were obtained by emerging or crushing methods. Subsequently, measurement and drawing were made on cercariae specimens and recognized. In some cases experimental infections were established in the animals for further identification. A total of 4 cercarial families and 1 cercarial group were identified as follows: Heterophyidae: Haplorchis pumilio, H. taithui, Stellantchasmus falcatus and Centrocestus formosanus; Echinostomatidae: Echinochasmus milvi; Cyathocotylidae, Philophthalmidae and Monostome group cercariae (probably Notocotylidae). These results have been recorded for the first time and these cercariae are of medical and veterinary importance.
Hydrocarbons Potential in the Azraq Area  [PDF]
Abdurrahman Qteishat, Mehaysen Ahmed AL-Mahasneh
Open Journal of Geology (OJG) , 2018, DOI: 10.4236/ojg.2018.88044
Abstract: Azraq area occupied more than 1400 sq. km in the central part of Jordan. The stratigraphic sequences in the area consist of a lithological bedding of classic and carbonate rocks with representing good factors for oil generation and accumulation. Wadi Sir (WS-2) Sediments have geochemical characteristics of a typical source rocks for oil source rocks which are mature below 9843 ft, and carbonate rocks of Hummar, Shueb, and Wadi Sir-2 formation formations (Turonian Cenomanian age) are a reservoir rocks, where reservoirs are capped by shale and argillaceous limestone which is sufficiently thick to cap underlying reservoir. Twenty wells have been drilled in different blocks in the Azraq area, and oil of 32 API has been discovered in 1982, in the area, and starts natural flow production about 1500 bbl/day from few wells, then production start decreasing due to lower reservoir pressure, then sucker rod pumps were used to produce oil. In this study, the regional maturity of the Wadi Sir-2 sediments appear that mature oil generation sources rocks occur within the northwesterly trending depression of the area where maturity of WS-2 sediments below 9843 ft occurs, these mature source rocks amount to about 220 sq. km, based on average thickness of 108.27 ft for WS-2 sediments and extractable organic matter that was determined 3008 ppm. The volumetric method indicates that the total oil in place in the area is 480215 tons, taking a primary recovery factor of 12% then the total recoverable oil is 57,625 tons, while the cumulative oil producing is 53,137 tons.
First record of the invasive snail Melanoides tuberculatus (Gastropoda: Prosobranchia: Thiaridae) in the Paran? River basin, GO, Brazil
Rocha-Miranda, F.;Martins-Silva, M. J.;
Brazilian Journal of Biology , 2006, DOI: 10.1590/S1519-69842006000600018
Abstract: the thiarid snail melanoides tuberculatus (müller, 1774), native to asia and east africa was recorded for the first time in the paran? river basin, goiás state. there is no evidence concerning introduction vectors but aquarium releases is the most probable vector. specimens were collected at three different water bodies after twenty-seven rivers were investigated. the possible spread of this species to other habitats and potential effects on native thermal water communities are discussed.
Distribution and habitats of Melanoides tuberculata (Müller, 1774) and M. victoriae (Dohrn, 1865) (Mollusca: Prosobranchia: Thiaridae) in South Africa
KN de Kock, CT Wolmarans
Water SA , 2009,
Abstract: An account is given of the geographical distribution and habitats of Melanoides tuberculata (Müller, 1774) and M. victoriae (Dohrn, 1865) as reflected by the samples on record in the database of the National Freshwater Snail Collection (NFSC) of South Africa. About 30 species of Melanoides occur in Africa of which only M. tuberculata is widespread. Melanoides tuberculata is also indigenous to India and the south-east Asian mainland to northern Australia and was widespread in the present-day Sahara during the late Pleistocene-Holocene, but M. victoriae seems to be restricted to Southern Africa. Details of the habitats on record for each species, as well as mean altitude and mean annual air temperature and rainfall for each locality, were processed to determine chi-square and effect-size values. An integrated decision-tree analysis indicated that temperature, altitude and type of substratum were the most important factors of those investigated that played a significant role in establishing the geographical distribution of these species in South Africa. In view of the fact that M. tuberculata can serve as intermediate host for a number of trematode species elsewhere in the world, it is recommended that the ability of the 2 local Melanoides species to act as intermediate hosts should be investigated. Due to the fact that the majority of sites from which these species were recovered were not since revisited, it is recommended that efforts should be made to update their geographical distribution and the results compared with the data in the database. The conservation status of these 2 species and the possible influence of global warming and climatic changes on their geographical distribution are briefly discussed.
Distribution and habitats of Melanoides tuberculata (Müller, 1774) and M. victoriae (Dohrn, 1865) (Mollusca: Prosobranchia: Thiaridae) in South Africa
KN de Kock, CT Wolmarans
Water SA , 2009,
Abstract: An account is given of the geographical distribution and habitats of Melanoides tuberculata (Müller, 1774) and M. victoriae (Dohrn, 1865) as reflected by the samples on record in the database of the National Freshwater Snail Collection (NFSC) of South Africa. About 30 species of Melanoides occur in Africa of which only M. tuberculata is widespread. Melanoides tuberculata is also indigenous to India and the south-east Asian mainland to northern Australia and was widespread in the present-day Sahara during the late Pleistocene-Holocene, but M. victoriae seems to be restricted to Southern Africa. Details of the habitats on record for each species, as well as mean altitude and mean annual air temperature and rainfall for each locality, were processed to determine chi-square and effect-size values. An integrated decision-tree analysis indicated that temperature, altitude and type of substratum were the most important factors of those investigated that played a significant role in establishing the geographical distribution of these species in South Africa. In view of the fact that M. tuberculata can serve as intermediate host for a number of trematode species elsewhere in the world, it is recommended that the ability of the 2 local Melanoides species to act as intermediate hosts should be investigated. Due to the fact that the majority of sites from which these species were recovered were not since revisited, it is recommended that efforts should be made to update their geographical distribution and the results compared with the data in the database. The conservation status of these 2 species and the possible influence of global warming and climatic changes on their geographical distribution are briefly discussed.
Managed Aquifer Recharge (MAR) through Surface Infiltration in the Azraq Basin / Jordan  [PDF]
Marwan Alraggad, Hind Jasem
Journal of Water Resource and Protection (JWARP) , 2010, DOI: 10.4236/jwarp.2010.212125
Abstract: Until the early 1990s the Azraq basin in Jordan was covered by a huge wetland in the central parts representing a source of fresh water for all purposes. The presence of such wetland in the desert created a natural pathway for migratory birds. Man made and natural impacts caused severe depletion of this basin and the oasis disappeared in the early 1990s. Under a GIS environment MAR layers were prepared for the Azraq basin. MAR mapping showed a very high and high potentials over 20.55% and 61.63% of the total basin area respectively; while the low potential areas represent only 4.03% of the total area.
Molecular Phylogeny and Estimated Time of Divergence in the Central European Melanopsidae: Melanopsis, Fagotia and Holandriana (Mollusca: Gastropoda: Cerithioidea)
Marcin Smoleń , Andrzej Falniowski
Folia Malacologica , 2009, DOI: 10.2478/v10125-009-0001-4
Abstract: Three European melanopsids: Melanopsis parreyssii (Philippi, 1847) from Ochiul Mare (Romania), Fagotia acicularis (A. Férussac, 1828) from a spring near Crisul Negru (Romania), and Holandriana holandri (C. Pfeiffer, 1828) from Lake Skutari (Montenegro), as well as Melanopsis costata Oliver, 1804 from Iraq, are considered is this paper. Eight partial sequences of ribosomal 18S, and seven of mitochondrial COI were analysed. Maximum likelihood trees based on 18S confirm the placement of the Melanopsidae within the Cerithioidea, as well as the monophyly of the latter group. The COI-based tree confirms the placement of the Melanopsidae within the Cerithioidea, but does not confirm the monophyly of either Melanopsidae or Cerithioidea. The results suggest that Fagotia should be synonymised with Melanopsis, Holandriana is a distinct genus, and Melanopsis costata is not congeneric with M. parreyssii. The application of molecular clock, with one point calibration for COI for the Hydrobiidae, estimated the times of divergence as 2.53±0.56 Mya for M. parreyssii and F. acicularis, 9.49±1.67 Mya for M. parreyssii and H. holandri, and 10.71±1.88 Mya for F. acicularis and H. holandrii. 2.5 Mya coincides with the beginning of the glacial period in Europe, and 8-12 Mya was the time when Lake Pannon covered the largest area.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.