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Articles 3601 - 3630 of 3859
Full-Text Articles in Physical Sciences and Mathematics
Contribution À L'Étude Des Cavités Karstiques Du Djurdjura (Algérie). Description Morpho-Hydrogéologique Et Cadre Évolutif, Yves Quinif
International Journal of Speleology
In North-Africa, the karst of Djurdjura Mountains is important because it shows high-alpine characters. In others papers, we have studied shallow morphology and speleological explorations. Here, we describe the caves: morphology, qualitative hydrology and fillings. These cavities are replaced in their morpho-structural context. We make distinctions between kinds of cavities. Gulfs and resurgences characterize high-alpine karst which is actual. Other caves that have their opening at the middle of slopes are dry, disconnected of actual morphological context. They belong to past karstification phases. From the synthesis of those elements, we show that it is possible to use karstic data in …
L'Equipement Sensoriel Des Trechinae Souterrains (Coléoptères). Ii - Ultrastructure Des Trichobothries De I'Elytre, Christian Juberthie, Françoise Piquemal
L'Equipement Sensoriel Des Trechinae Souterrains (Coléoptères). Ii - Ultrastructure Des Trichobothries De I'Elytre, Christian Juberthie, Françoise Piquemal
International Journal of Speleology
The ultrastructure of trichobothria (Tm2, Tr2, Tr4) of the elytra has been studied in the troglobitic Coleoptera Geotrechus vulcanus and Aphaenops cerberus. Two bipolar neurons innervate these trichobothria. The first ends at the level of the hair base, and its distal segment contains a tubular body, characteristic of mechanoreceptive bristles. The other does not possess a tubular body, and its distal segment ends in the bristle canal; its function is unknown. The trichobothria possess one glial enveloping cell, one trichogen cell, and one tormogen cell; the latter two show an apical, common, large, receptor lymph cavity. The small trichobothria …
Dytiscidae Cavernicoles De Papouasie (Résultats Zoologiques De La Mission Spéléologique Britannique En Papouasie - Nouvelle Guinée, 1975, 1), Vassil B. Guéorguiev
Dytiscidae Cavernicoles De Papouasie (Résultats Zoologiques De La Mission Spéléologique Britannique En Papouasie - Nouvelle Guinée, 1975, 1), Vassil B. Guéorguiev
International Journal of Speleology
This paper reports the results of the investigations on Dytiscidae from New Guinea caves. Three new species are described: Copelatus subterraneus sp.n., Platynectes (Metaplatynectes) beroni sp.n. and P. (M.) chapmani sp. n. Synonymic notes on the subgenera of the genus Platynectes and descriptions of two new subgenera Notoplatynectes subgen. n. and Metaplatynectes subgen. n. are also reported.
Neue Ergebnisse Speläologischer Untersuchungen In Den Hainburger Bergen (Nö) Und Ihre Wissenschaftliche Bedeutung, Karl Mais
International Journal of Speleology
Since 1971 speleological and paleontological investigations have been carried out in the quarry “Hollitzer” which is in the Pfaffenberg near Bad Deutsch Altenburg (Hainburger Berge, Lower Austria). Evident karst phenomena are missing at the surface, but the existence of caves filled with sediments in the quarry show that the area is a fossil buried karst. A steady scientific survey allowed the study of the karstic phenomena without hindering the work in the quarry. Up to now more than 150 cavities have been discovered. Most of them seem to belong to a unique solutional system; corrasive forms are missing. Fossils (Gasteropoda, …
A Remarkable New Genus And Three New Species Of Cavernicolous Carabidae (Coleoptera) (Zoological Results Of The British Speleological Expedition To Papua-New Guinea 1975, 2), B. P. Moore
International Journal of Speleology
Speagonum mirabile gen. et sp. n. and Gastragonum caecum sp. n. are described as troglobites from caves in the Behrman Mountains of west New Guinea; Pseudozaena (Trichozaena subgen. n.) cavicola sp. n. is a troglophile from New Ireland.
Adolph Schmidl (1802 - 1863) The Father Of Modern Speleology?, T. R. Shaw
Adolph Schmidl (1802 - 1863) The Father Of Modern Speleology?, T. R. Shaw
International Journal of Speleology
A. Adolf Schmidl (1802-1863) was the first person to regard speleology as a single coherent subject. Besides making important new explorations, he studied karst hydrology and underground meteorology and was also closely concerned with the work of others on cave fauna and flora. His publications ensured that his achievements were known to his successors, but his influence was less widespread than that of Martel who nevertheless called him “the real originator of speleology”.
Primary Productivity In Hillsborough Bay, City Of Tampa Department Of Sanitary Sewers
Primary Productivity In Hillsborough Bay, City Of Tampa Department Of Sanitary Sewers
Reports
This study was designed to be a long term ecological study. Effects of nutrient removal through time on productivity is expected to be shown.
As the treatment progresses from primary to secondary, to nitrification, to denitrification, we expect to be able to document corresponding drops in productivity levels.
Final Report Anclote Commercial Plankton Monitoring Program, E. P. Wilkens, W. R. Weiss, J. D. Horne
Final Report Anclote Commercial Plankton Monitoring Program, E. P. Wilkens, W. R. Weiss, J. D. Horne
Reports
Commercial plankton were monitored in the vicinity of Florida Power Corporation's Ancolote power plant from January through December, 1976 in order to assess the entrainment potential for ichthyoplankton and planktonic stages of commercially important invertebrates and to estimate the annual standing crop of these organisms.
The purpose of this report is to present commercial plankton data collected at anclote from January through December of 1976. Additional data gathered by Florida Power Corporation and the University of South Florida during 1975 is also discussed. Entrainment loss estimates for commercial plankton have been calculated and are discussed in terms of their possible …
Ancolote Power Station Post-Operational Plankton Monitoring Program: Vol 1 Technical Discussion, Westinghouse Electric Corporation, Environmental Systems Department (Pa)
Ancolote Power Station Post-Operational Plankton Monitoring Program: Vol 1 Technical Discussion, Westinghouse Electric Corporation, Environmental Systems Department (Pa)
Reports
The affect of the Anclote Power Station on the plankton community was evaluated by (1) determining differences among stations, (2) comparing results from the post-operational plankton monitoring program, 93) examining any major changes in seasonal cycles from those expected of plankton communities in shallow-water, subtropical estuaries and (4) determining the frequency of occurrence and extent of temperatures known to adversely affect the copepods Acartia tonsa and Oithona spp.
Anclote Power-Station Post-Operational Plankton Monitoring Program Volume I: Technical Discussion, Westinghouse Electric Corporation, Environmental Systems (Pa), Florida Power Corporation
Anclote Power-Station Post-Operational Plankton Monitoring Program Volume I: Technical Discussion, Westinghouse Electric Corporation, Environmental Systems (Pa), Florida Power Corporation
Reports
As part of the National Pollutant Discharge Elimination System the U.S. Environmental Protection Agency has required that Florida Power Corporation (FPC) demonstrate that .operation of the Anclote Power Station does not adversely affect the aquatic community of the Anclote River and Anchorage. In response to this requirement FPC initiated the Anclote Post-operational Ecological Monitoring Program and contracted with Westinghouse Environmental Systems Department to conduct the plankton monitoring portion of the program.
Anclote Power Station Post-Operational Plankton Monitoring Program: Vol 2 Appendices, Florida Power Corporation
Anclote Power Station Post-Operational Plankton Monitoring Program: Vol 2 Appendices, Florida Power Corporation
Reports
Appendix IV-A through appendix IV-F
Anclote Power-Station Post-Operational Plankton Monitoring Program Volume Ii: Appendices, Environmental Systems Department Pittsburgh, Pennsylvania, Florida Power Corporation
Anclote Power-Station Post-Operational Plankton Monitoring Program Volume Ii: Appendices, Environmental Systems Department Pittsburgh, Pennsylvania, Florida Power Corporation
Reports
Appendix IV-A through IV-F
Impact Of Dredging In Tampa Bay 1976, Roy R. Lewis Iii
Impact Of Dredging In Tampa Bay 1976, Roy R. Lewis Iii
Reports
During the last 100 years four major types of dredging have impacted the bay: channel deepening, maintenance dredging, shell dredging, and dredging for landfill construction. These landfills have resulted in the loss of 44% of the original marine wetlands bordering Tampa Bay. Recent environmental concerns have halted landfill dredging and severely restricted maintenance dredging.
1976 Water Quality Hillsborough County, Florida, R. G. Wilkins
1976 Water Quality Hillsborough County, Florida, R. G. Wilkins
Reports
The Hillsborough County Environmental Protection Ac t charges the Environmental Prote ction Commission with the function of establishing, operating and maintaining a continuous program for monitoring water pollution. A county-wide water quality surveillance network has been designed to provide accurate data and information as t o whether the requirements of the Act are being complied with and whether the level of water pollution is increasing or decreasing throughout the county.
This broad base of water data obtained during 1972-1976 provides useful background data for eventual development, revision and enforcement of regulations, standard effluent limitation plans, or programs established under the …
Nouvelles Données Sur L'Écologie Et La Biogéographie De Niphargus Nadarini Alouf (Crustacés, Amphipodes), N. J. Alouf
Nouvelles Données Sur L'Écologie Et La Biogéographie De Niphargus Nadarini Alouf (Crustacés, Amphipodes), N. J. Alouf
International Journal of Speleology
Some new samples made between 1971 and 1975 show that the area of extension of Niphargus nadarini Alouf is the Biqa’s plain. New data about the ecology of this species is given.
Nitrobacter In Mammoth Cave, C. B. Fliermans, E. L. Schmidt
Nitrobacter In Mammoth Cave, C. B. Fliermans, E. L. Schmidt
International Journal of Speleology
Mammoth Cave, a large limestone cavern in Mammoth Cave National Park in the Central Kentucky karst, was first mined for saltpetre in 1808 and was a major source of nitrates used in the manufacture of gunpowder during the War of 1812. The mechanism of saltpetre formation is unknown, although hypotheses encompassing both biotic and abiotic functions have been suggested. Present studies were conducted in various saltpetre caves using species specific fluorescent antibodies in order to determine if the chemoautotroph, Nitrobacter, were present. Population densities and species distribution of Nitrobacter were studied in relation to chemical and physical parameters for …
Recherches Sur Les Ostracodes Entocytheridae. Données Sur Sphaeromicola Cebennica Juderthiei Nov. Ssp. Et Sphaeromicola Cirolanae Rioja, Dan L. Danielopol
Recherches Sur Les Ostracodes Entocytheridae. Données Sur Sphaeromicola Cebennica Juderthiei Nov. Ssp. Et Sphaeromicola Cirolanae Rioja, Dan L. Danielopol
International Journal of Speleology
Sphaeromicola cebennica juberthiei n. ssp., a cavernicolous ostracod found in the South of France (Système de Cent Fons and Avencas, Herault), is described here. The new subspecies differs from Sph. cebennica cebennica (found in a cave from Ardèche) by the smaller carapace and a reduced distal bristle on the ‘finger” of the male copulatory organ. The affinities and differences between the European Sphaeromicola and Sph. cirolanae from Mexico are discussed. The genus Sphaeromicola is divided into two groups of species: the group topsenti and the group cirolanae. Some observations on the mating process of Sph. Cebennica juberthiei are presented. …
Variation Among Populations Of The Troglobitic Amphipod Crustacean Crangonyx Antennatus Packard Living In Different Habitats I. Morphology, Gary W. Dickson
Variation Among Populations Of The Troglobitic Amphipod Crustacean Crangonyx Antennatus Packard Living In Different Habitats I. Morphology, Gary W. Dickson
International Journal of Speleology
Populations of the troglobitic (i.e., obligatory cavernicole) amphipod Crangonyx antennatus living in two distinct aquatic habitats were examined for possible morphological variation. Collections were made seasonally for one year in six Lee Co., Virginia caves, three with mud-bottom pools and three with small gravel-bottom streams. Environmental parameters thought to influence population variation were recorded for each of the six caves. Body length of mature amphipods was found to be greater in the mud-bottom pool habitats, whereas stream amphipods possessed more first antennal segments per unit body length. Variation was also observed in integument coloration; stream amphipods were characterized by a …
Stenasellus Escolai N. Sp., Crustacea Isopoda Asellota Des Eaux Souterraines D'Espagne Méridionale, Guy Magniez
Stenasellus Escolai N. Sp., Crustacea Isopoda Asellota Des Eaux Souterraines D'Espagne Méridionale, Guy Magniez
International Journal of Speleology
This new species was captured in the phreatic waters of Guadalquivir valley, where it lives together with another, very small-sized Stenasellid: St. bragai Magniez, previously described. It belongs to the phyletic line of St. breuili Racovitza, which colonizes the subterranean waters of the Iberic peninsula.
Water Quality 1975 Hillsborough County, Florida, A. J. Shaw, C. Dunn, T. Cardinale, R. Powell, R. Wilkins
Water Quality 1975 Hillsborough County, Florida, A. J. Shaw, C. Dunn, T. Cardinale, R. Powell, R. Wilkins
Reports
No abstract provided.
Remarques Sur L'Aselle Psammique Proasellus Walteri (Chappuis, 1948) (Crustacea, Isopoda, Asellota), Jean-Paul Henry
Remarques Sur L'Aselle Psammique Proasellus Walteri (Chappuis, 1948) (Crustacea, Isopoda, Asellota), Jean-Paul Henry
International Journal of Speleology
P. walteri, an eyeless species of tiny size and thin body, shows numerous original characters. By its general morphology, it is one form of Asellid best adapted to the phreatic waters where it exists in large settlements. It is also able to live in the psammic biotope in a manner similar to Microparasellids. The females lay only 6 to 10 normal sized eggs. There is no indication of oostegits outside the breeding period. In some populations, the small number of eggs, correlated with the small size, seems to be compensated by a sex-ratio favorable so the females.
Studies On Subterranean Drift Of Stygobiont Crustaceans (Niphargus, Crangonyx, Graeteriella), Siegfried Husmann
Studies On Subterranean Drift Of Stygobiont Crustaceans (Niphargus, Crangonyx, Graeteriella), Siegfried Husmann
International Journal of Speleology
In two groundwater canals of a water work in West Germany the drift of stygobiont groundwater organisms was investigated. The collections were made at two-hour intervals. Niphargus aquilex Schiodte, Crangonyx subterraneus Bate and Graeteriella unisetigera (Graeter) were considered more closely, because they were caught in greater numbers than other organisms. These stygobionts show no sign of dial periodicity.
Sur Les Bathynella De Roumanie: B. (B.) Boteai Serban, B. (B.) Vaducrisensis N. Sp., B. (B.) Plesai Serban Et B. (B.) Motrensis Serban (Bathynellacea, Bathynellidae), Deuxième Partie, Eugène Serban
International Journal of Speleology
In the second part of the note a discussion is given dealing with the importance of different characters in the systematics of the genus Bathynella Vejdovsky and with species individualisation in the sub-genus Bathynella (Bathynella) Vejdovsky. We emphasize the differentiation of some elements of the VIIIth male pereiopodes, these appendages never having the same morphology in different species. Taking into account the structure of the apical end of the pennian anterior plates, we suggest to group separately boteai with vaducrisensis and plesai with ruffoi. The main conclusions of the recent studies on the European Bathynella are also given.
The Role Of Groundwater In Eutrophication Of A Lake In Glacial Outwash Terrain, David Robert Lee
The Role Of Groundwater In Eutrophication Of A Lake In Glacial Outwash Terrain, David Robert Lee
International Journal of Speleology
The nutrient contribution of groundwater in glacial outwash terrain was evaluated at Lake Sallie in north-central U.S.A. (46°46’ N., 95° 54’ W.). Groundwater entering the lake was collected with seepage meters consisting of bottomless cylinders vented to a thin membrane bag. A theoretical flow net and comparison of nutrient concentrations in well and seepage water indicated that seepage meters can be used in high velocity discharge areas to obtain site-specific water samples of groundwater for nutrient analyses. Based on an average value of 0.25 mg/l PO4, groundwater inflow along an 800 km segment of shoreline transported 37 kg …
The Karst Of Transvaal (South Africa), J. Martini, I. Kavalieris
The Karst Of Transvaal (South Africa), J. Martini, I. Kavalieris
International Journal of Speleology
The Transvaal Karst is a world important example of a Karst developed on a very old dolomite. Its unique character is due to the composition of the rock and history of development. The dissolution of the dolomite is interesting and has an important effect on the character of the caves developed. The caves preserved in this area include the longest known in South Africa and are perhaps among the largest dolomite systems known in the world. They are very old and in some cases contain important palaeontological deposits (Australopithecine fauna). The caves to various degrees are in a state of …
Notes Préliminaires Sur La Distribution Spatiale De Meta Menardi, Triphosa Dubitata, Triphosa Sabaudiata, Nelima Aurantiaca Et Culex Pipiens Au Sein D'Un Écosystème Cavernicole (Grotte De La Scierie: Hte.-Savoie), John D. Bourne
International Journal of Speleology
Following 8 months of observations in a richly populated cave, (Grotte de la Scierie, HauteSavoie, France), it has been possible to outline the movements and distribution of Meta menardi (Araneae), Nelima aurantiaca (Opiliones), Triphosa dubitata and Triphosa sabaudiata (Lepidoptera) and Culex pipiens (Diptera) within the cave ecosystem. Although no general rule can be postulated it appears that the morphology of the cave walls and the climatic conditions regulate the distribution of these 5 species within the cave ecosystem. The interactions between the 5 species have been investigated.
La Léthargie Chez Les Chiroptères Cavernicoles D'Afrique Centrale, Michel Anciaux De Faveaux
La Léthargie Chez Les Chiroptères Cavernicoles D'Afrique Centrale, Michel Anciaux De Faveaux
International Journal of Speleology
From his personal research undertaken in the subterranean field (natural and artificial cavities) in Shaba (ex-Katanga, in S.E. Zaire) and Rwanda, the author briefly defines the macroclimate of the prospected regions as well as the microclimate of the subterranean habitat (humidity and temperature). A reversible hypothermia has been noticed in the dry season only (from May till August) in eleven species of troglophile Chiroptera belonging to the following families: Rhinolophidae (7 species of Rhinolophus), Hipposideridae (only Hipposideros ruber) and Vespertilionidae (Miniopterus inflatus rufus, Miniopterus schreibersi arenarius & M.s. natalensis, Myotis tricolor). No sign of lethargy has …
Hydrogeologische Untersuchungen In Einem Von Salzhaltigem Uferfiltrat Durchströmten Bodenkörper, Matthias Neuß
Hydrogeologische Untersuchungen In Einem Von Salzhaltigem Uferfiltrat Durchströmten Bodenkörper, Matthias Neuß
International Journal of Speleology
An aquifer in a horseshoe bend of the Weser river was investigated regarding the processes of the river water infiltration. The geology and geometry of the aquifer was ascertained by means of numerous borings. The hydraulic situation before and after infiltration was determined by water table maps. The intrusion of a salt-freshwater lens could be reconstructed from the beginning of infiltration until ten years later by means of previous results of chemical analysis. By new chemical analysis it was proved that river water infiltrates into the aquifer. Additionally it was established that the relatively high concentration of chloride is reduced …
The Distribution Of The Fauna In The Interstitial Habitats Of Riverine Sediments Of The Danube And The Piesting (Austria), Dan L. Danielopol
The Distribution Of The Fauna In The Interstitial Habitats Of Riverine Sediments Of The Danube And The Piesting (Austria), Dan L. Danielopol
International Journal of Speleology
The interstitial fauna living in the riverine sediments of the Danube and Piesting have been investigated in Lower Austria. The nematodes, oligochaetes and cyclopoids are the most abundant groups (they represent up to 80% of the total fauna). The harpacticoids, the insect larvae, the isopods, the amphipods, the cladocera and the limnohalacarids are poorly represented (generally under 20% of the total fauna). The absence of hydrachnellids is striking. The vertical distribution of the interstitial fauna shows for several groups i.e. limnohalacarids, ostracods, isopods, harpacticoids, that the epigean species are quantitatively better represented in the upper sediment layers instead of the …
Über Ökologische Und Biogeographische Trends Innerhalb Der Harpacticoiden (Copepoda - Crustacea), Hans Jakobi
Über Ökologische Und Biogeographische Trends Innerhalb Der Harpacticoiden (Copepoda - Crustacea), Hans Jakobi
International Journal of Speleology
The majority of harpacticoids show a great dependence on the peculiarities of their habitat. This research attempted to detect the possible existence of biogeographical and ecological trends. The limited biogeographical data is discussed, so this is applied the method of analysis of morpho-ecological correlation (Jakobi, 1962) developed to determine ecological trends. This way, all characteristics of the harpacticoidean body selected were studied to check their adaptative value. Based on those results it was possible to establish and to define ecological units. Data were then subjected to statistical tests of homogeneity for variance and significance. Graphs are used to demonstrate the …