Redescription of Paracuaria adunca (Creplin, 1846) (Nematoda: Acuarioidea) from Larus delawarensis Ord (Laridae)

1982 ◽  
Vol 60 (2) ◽  
pp. 175-179 ◽  
Author(s):  
P. L. Wong ◽  
R. C. Anderson
Keyword(s):  
Lake Ontario ◽  
Larus Delawarensis ◽  
The Status

Paracuaria adunca (Creplin, 1846) Anderson and Wong, 1981 from the oesophagus of Ring-billed Gulls (Larus delawarensis Ord) of Lake Ontario, Canada, is redescribed. The following synonyms are recognized: Paracuaria tridentata (Linstow, 1877); P. macdonaldi Rao, 1951; Rusguniella transcaucasica Solonitsin, 1932; Streptocara rissae Kreis, 1958. Paracuaria adunca, now generitype of the genus, is apparently a widely distributed species in fish-eating birds. Paracuaria formosensis (Sugimoto, 1930) is transferred back to the genus Streptocara. The status of P. soricis Jancev, 1972 of shrews is doubtful; it is not likely a member of Paracuaria. Paracuaria adunca is the only recognized member of Paracuaria.

THE STATUS OF PARASITES OF THE APPLE MAGGOT, RHAGOLETIS POMONELLA (DIPTERA: TEPHRITIDAE), IN ONTARIO

1971 ◽  
Vol 103 (4) ◽  
pp. 507-512 ◽  
Author(s):  
L. G. Monteith
Keyword(s):  
Lake Ontario ◽  
Rhagoletis Pomonella ◽  
Southern Ontario ◽  
Niagara Escarpment ◽  
The Status

AbstractOpius melleus Gah. and O. lectus Gah. were the only parasites of Rhagoletis pomonella (Walsh) found in southern Ontario during a 4-year survey. The parasites were found only in the Niagara Region on the slope of the Niagara Escarpment and between it and Lake Ontario. The population of parasites was low though they appeared to be well adapted to attack R. pomonella. They were found in, or adjoining, unsprayed sites where there was shrubby growth under the trees infested by R. pomonella.

Redescription of Pectinospirura argentata Wehr, 1933 (Nematoda: Acuarioidea) from Larus delawarensis Ord (Laridae)

1982 ◽  
Vol 60 (8) ◽  
pp. 1940-1944 ◽  
Author(s):  
P. L. Wong ◽  
R. C. Anderson
Keyword(s):  
Lake Ontario ◽  
Larus Delawarensis

Pectinospirura argentata Wehr, 1933 is redescribed on the basis of specimens from the proventriculus of ring-billed gulls, Larus delawarensis Ord, from Lake Ontario. The specimens were compared with the paratypes of Wehr (1933). Pectinospirura sobolevi Turemuratov, 1965 is considered a synonym of P. argentata and the validity of the remaining two species P. multidentata Sobolev, 1943 and P. tringae Wang, 1976 is discussed.

How different is different? Defining management and conservation units for a problematic exploited species

2009 ◽  
Vol 66 (9) ◽  
pp. 1617-1630 ◽  
Author(s):  
Andrea M. Bernard ◽  
Moira M. Ferguson ◽  
David L.G. Noakes ◽  
Bruce J. Morrison ◽  
Chris C. Wilson
Keyword(s):  
New York ◽  
Fishery Management ◽  
Lake Ontario ◽  
Evolutionary Significance ◽  
Lake Whitefish ◽  
Conservation Units ◽  
Phylogenetic Groups ◽  
Spawning Aggregations ◽  
The Status ◽  
Lake Simcoe

Discontinuous genetic structure is widely used to delineate local, regional, and phylogenetic groups within species for conservation and management purposes. We used microsatellite markers to assess the genetic distinctiveness of putative stocks and populations of lake whitefish ( Coregonus clupeaformis ) in Ontario waters. Analysis of spawning aggregations in eastern Lake Ontario showed fish from Chaumont Bay, New York, to be weakly differentiated from spawning whitefish in and near the Bay of Quinte, Ontario. No significant differences were found between lake- and bay-spawning aggregations within the Bay of Quinte. These same genetic tools were used to test the distinctiveness and evolutionary significance of Lake Simcoe lake whitefish as a designatable unit (DU) under guidelines established by the Committee on the Status of Endangered Wildlife in Canada (COSEWIC). Although there was marked differentiation among populations from across Ontario, the Lake Simcoe population was closely allied with lake whitefish populations from Lake Ontario and Lake Huron, suggesting that a distinct status is not warranted on genetic grounds. This work demonstrates how assessing hierarchical diversity under COSEWIC’s framework can provide key information of the status of exploited populations for fishery management.

Redescription of Cosmocephalus obvelatus (Creplin, 1825) (Nematoda: Acuarioidea) from Larus delawarensis Ord (Laridae)

1981 ◽  
Vol 59 (10) ◽  
pp. 1897-1902 ◽  
Author(s):  
R. C. Anderson ◽  
P. L. Wong
Keyword(s):  
Lake Ontario ◽  
New Combination ◽  
Larus Delawarensis

Cosmocephalus obvelatus (Creplin, 1825) Seurat, 1919 is redescribed on the basis of specimens from the oesophagus of Larus delawarensis Ord from Lake Ontario. The specimens were compared with Creplin's (1825) types of C. obvelatus and the following synonyms of obvelatus are recognized: Cosmocephalus diesingi Molin, 1858; Spiroptera adunca Stossich, 1892 (not Creplin, 1846); Cosmocephalus aduncus Yorke and Maplestone, 1926 (not Creplin, 1846); Cosmocephalus faridi Khalil, 1931; Cosmocephalus firlottei Rao, 1951; Cosmocephalus tanakai Rodrigues and Vicente, 1963. Creplin's types of Cosmocephalus adunca (Creplin, 1846) Yorke and Maplestone, 1926 were examined and shown to belong to the genus Paracuaria resulting in the new combination Paracuaria adunca (Creplin, 1846) n.comb. Cosmocephalus asturis Yorke and Maplestone, 1926 is transferred to the genus Synhimantus, i.e. S. asturis (Yorke and Maplestone, 1926) n.comb. Besides C. obvelatus, the genus Cosmocephalus apparently contains only C. capellae Yamaguti, 1935; C. imperialis Morishita, 1930; and C. jaenschi Johnston and Mawson, 1941.

scholarly journals Sterols and stanols as novel tracers of waterbird population dynamics in freshwater ponds

2018 ◽  
Vol 285 (1877) ◽  
pp. 20180631 ◽  
Author(s):  
Kathryn E. Hargan ◽  
Emily M. Stewart ◽  
Neal Michelutti ◽  
Christopher Grooms ◽  
Linda E. Kimpe ◽  
...  
Keyword(s):  
Lake Ontario ◽  
Phalacrocorax Auritus ◽  
Bird Abundance ◽  
Reliable Technique ◽  
Freshwater Ponds ◽  
Waterbird Species ◽  
Isotopic Methods ◽  
Reduced Products ◽  
Larus Delawarensis ◽  
Omnivorous Diet

With the expansion of urban centres in the mid-twentieth century and the post-1970 decrease in pesticides, populations of double-crested cormorants ( Phalacrocorax auritus ) and ring-billed gulls ( Larus delawarensis ) around Lake Ontario (Canada and USA) have rapidly rebounded, possibly to unprecedented numbers. Along with the use of traditional palaeolimnological methods (e.g. stable isotopes, biological proxies), we now have the capacity to develop specific markers for directly tracking the presence of waterbirds on nesting islands. Here, we apply the use of lipophilic sterols and stanols from both plant and animal-faecal origins as a reliable technique, independent of traditional isotopic methods, for pinpointing waterbird arrival and population growth over decadal timescales. Sterol and stanol concentrations measured in the guano samples of waterbird species were highly variable within a species and between the three species of waterbirds examined. However, cholesterol was the dominant sterol in guano, and phytosterols were also high in ring-billed gull guano. This variability highlights a specialist piscivorous diet for cormorants compared to a generalist, omnivorous diet for gulls, which may now often include grain and invertebrates from agricultural fields. A ratio that includes cholesterol and sitosterol plus their aerobically reduced products (cholestanol, stigmastanol) best explained the present range of bird abundance across the islands and was significantly correlated to sedimentary δ 15 N. Overall, we demonstrate the use of sterols and stanols as a direct means for tracking the spatial and temporal presence of waterbirds on islands across Lake Ontario, and probably elsewhere.

The study of interfacial reactions of nickel thin films on GaAs

1983 ◽  
Vol 41 ◽  
pp. 156-157
Author(s):  
L.J. Chen ◽  
Y.F. Hsieh
Keyword(s):  
Thin Films ◽  
Integrated Circuits ◽  
Interfacial Reactions ◽  
Metal Contacts ◽  
Nickel Thin Films ◽  
Thin Foils ◽  
The Status ◽  
Si Doped ◽  
Electron Microscopes

One measure of the maturity of a device technology is the ease and reliability of applying contact metallurgy. Compared to metal contact of silicon, the status of GaAs metallization is still at its primitive stage. With the advent of GaAs MESFET and integrated circuits, very stringent requirements were placed on their metal contacts. During the past few years, extensive researches have been conducted in the area of Au-Ge-Ni in order to lower contact resistances and improve uniformity. In this paper, we report the results of TEM study of interfacial reactions between Ni and GaAs as part of the attempt to understand the role of nickel in Au-Ge-Ni contact of GaAs.N-type, Si-doped, (001) oriented GaAs wafers, 15 mil in thickness, were grown by gradient-freeze method. Nickel thin films, 300Å in thickness, were e-gun deposited on GaAs wafers. The samples were then annealed in dry N2 in a 3-zone diffusion furnace at temperatures 200°C - 600°C for 5-180 minutes. Thin foils for TEM examinations were prepared by chemical polishing from the GaA.s side. TEM investigations were performed with JE0L- 100B and JE0L-200CX electron microscopes.

Fate of sperm membrane in fertilized ova

1993 ◽  
Vol 51 ◽  
pp. 40-41
Author(s):  
Frank J. Longo
Keyword(s):  
Electron Microscopy ◽  
Electrical Activity ◽  
Sea Urchins ◽  
Morphological Changes ◽  
Integrated System ◽  
Electrophysiological Recording ◽  
Experimental Conditions ◽  
The Status ◽  
Sperm Membrane ◽  
Temporal And Spatial

Measurement of the egg's electrical activity, the fertilization potential or the activation current (in voltage clamped eggs), provides a means of detecting the earliest perceivable response of the egg to the fertilizing sperm. By using the electrical physiological record as a “real time” indicator of the instant of electrical continuity between the gametes, eggs can be inseminated with sperm at lower, more physiological densities, thereby assuring that only one sperm interacts with the egg. Integrating techniques of intracellular electrophysiological recording, video-imaging, and electron microscopy, we are able to identify the fertilizing sperm precisely and correlate the status of gamete organelles with the first indication (fertilization potential/activation current) of the egg's response to the attached sperm. Hence, this integrated system provides improved temporal and spatial resolution of morphological changes at the site of gamete interaction, under a variety of experimental conditions. Using these integrated techniques, we have investigated when sperm-egg plasma membrane fusion occurs in sea urchins with respect to the onset of the egg's change in electrical activity.

Revisiting the status of dental ethics instruction

2000 ◽  
Vol 64 (11) ◽  
pp. 772-774 ◽  
Author(s):  
JG Odom ◽  
PL Beemsterboer ◽  
TD Pate ◽  
NK Haden
Keyword(s):  
Ethics Instruction ◽  
The Status

The status of cosmology

2002 ◽  
Vol 110 (2) ◽  
pp. 9-15 ◽  
Author(s):  
W Freedman
Keyword(s):  
The Status

Multicultural Assessment of Personality and Psychopathology in the United States: Still Art, Not Yet Science, and Controversial

1998 ◽  
Vol 14 (1) ◽  
pp. 62-70 ◽  
Author(s):  
Richard H. Dana
Keyword(s):  
United States ◽  
Racial Identity ◽  
The United States ◽  
Therapeutic Assessment ◽  
Culturally Competent ◽  
Research Attention ◽  
The Status ◽  
Training Research ◽  
Multicultural Assessment ◽  
Personality Description

This paper describes the status of multicultural assessment training, research, and practice in the United States. Racism, politicization of issues, and demands for equity in assessment of psychopathology and personality description have created a climate of controversy. Some sources of bias provide an introduction to major assessment issues including service delivery, moderator variables, modifications of standard tests, development of culture-specific tests, personality theory and cultural/racial identity description, cultural formulations for psychiatric diagnosis, and use of findings, particularly in therapeutic assessment. An assessment-intervention model summarizes this paper and suggests dimensions that compel practitioners to ask questions meriting research attention and providing avenues for developments of culturally competent practice.

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