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.

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.

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.

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.

Chemical and Biological Changes in Nelson Lake, Ontario Following Experimental Elevation of Lake pH

1977 ◽  
Vol 12 (1) ◽  
pp. 213-232 ◽  
Author(s):  
N.D. Yan ◽  
W.A. Scheider ◽  
P.J. Dillon
Keyword(s):  
Heavy Metal ◽  
Lake Ontario ◽  
Background Concentrations ◽  
Precambrian Shield ◽  
Metal Levels ◽  
Zooplankton Communities ◽  
Shield Lakes

Abstract Intensive studies of Nelson Lake, a Sudbury area lake of intermediate pH ~5.7), were begun in 1975. The chemistry of the lake was typical of that of most PreCambrian Shield lakes except that low alkalinities and high sulphate concentrations were observed along with elevated heavy metal levels. After raising the pH of Nelson Lake to 6.4 by addition of Ca(OH)2 and CaCO3, the metals were reduced to background concentrations. Phytoplankton and Zooplankton communities, which at pH of 5.7 were typical of PreCambrian lakes, were not affected by the experimental elevation of lake pH.

Impact of Proposed Burlington and Hamilton Sewage Discharges in Western Lake Ontario

2003 ◽  
Vol 38 (4) ◽  
pp. 627-645 ◽  
Author(s):  
Yerubandi R. Rao ◽  
Raj C. Murthy ◽  
Fausto Chiocchio ◽  
Michael G. Skafel ◽  
Murray N. Charlton
Keyword(s):  
Action Plan ◽  
Near Field ◽  
Lake Ontario ◽  
Zone Model ◽  
Hamilton Harbour ◽  
Western Lake ◽  
Treated Sewage ◽  
Treated Effluents ◽  
Typical Summer ◽  
The City

Abstract The alternate strategy of open-lake discharge may alleviate the need for unusually stringent treatment needed to meet water quality goals of the Hamilton Harbour Remedial Action Plan (RAP). The latest update of the RAP recommended a study of the possibility of offshore discharges. A study conducted for the City of Burlington has proposed a location for outfall in Lake Ontario. This paper utilizes a combination of physical limnological data and mathematical models to predict the waste plume characteristics for the proposed outfall in the lake. Near-field dilutions obtained from a mixing zone model show that, for treated effluents with a discharge condition of 2 m3/s at the proposed outfall site at Burlington, the dilution ratios are in the range of 13:1 to 28:1 for weak to moderate currents during summer stratification. Winter dilution ratios increased to 21:1 to 96:1 for moderate currents. The recommended site for open-lake outfall provides acceptable near-field dilutions for treated effluents under typical lake currents and density structure. The extension of outfall to a location farther offshore is only marginally beneficial. With the proposed Burlington outfall location and discharge conditions, no far-field contamination is observed near the beaches or nearby water intakes for typical summer and winter conditions. Thus, this study indicates that by discharging the treated sewage from an outfall in Lake Ontario it is possible to achieve the Hamilton Harbour RAP goals.

Loadings of Selected Chemicals into the St. Lawrence River System from Lake Ontario, 1986/87

1989 ◽  
Vol 24 (4) ◽  
pp. 589-608 ◽  
Author(s):  
I.K. Tsanis ◽  
J. Biberhofer ◽  
C.R. Murthy ◽  
A. Sylvestre
Keyword(s):  
Mass Balance ◽  
Lake Ontario ◽  
River System ◽  
Vertical Gradient ◽  
The South ◽  
Measured Concentration ◽  
Chemical Monitoring ◽  
The North ◽  
Loading Estimates ◽  
St Lawrence River

Abstract Determination of the mass output through the St. Lawrence River outflow system is an important component in computing mass balance of chemical loadings to Lake Ontario. The total flow rate in the St. Lawrence River System at the Wolfe Island area was calculated from detailed time series current meter measurements from a network of current meters and Lagrangian drifter experiments. This flow is roughly distributed in the ratio of 55% to 45% in the South and North channel, respectively. Loading estimates of selected chemicals have been made by combining the above transport calculations with the ongoing chemical monitoring data at the St. Lawrence outflow. A vertical gradient in the concentration of some organic and inorganic chemicals was observed. The measured concentration for some of the chemicals was higher during the summer months and also is higher in the South Channel than in the North Channel of the St. Lawrence River. These loading estimates are useful not only for modelling the mass balance of chemicals in Lake Ontario but also for serving as input loadings to the St. Lawrence River system from Lake Ontario.

Identification of Taste and Odour Compounds from Western Lake Ontario

1984 ◽  
Vol 19 (1) ◽  
pp. 111-118 ◽  
Author(s):  
B.G. Brownlee ◽  
D.S. Painter ◽  
R.J. Boone
Keyword(s):  
Water Supply ◽  
Water Samples ◽  
Elemental Sulfur ◽  
Lake Ontario ◽  
Direct Link ◽  
Municipal Water Supply ◽  
Municipal Water ◽  
Western Lake ◽  
Odour Concentration

Abstract During August, 1983 geosmin was identified in a municipal water supply drawn from western Lake Ontario. The geosmin concentrations were 0.01-0.07 μg L-1, within the range for threshold odour concentration of 0.01-0.2 μg L-1. 2-Methylisoborneol was not detected. The odour 'event' coincided with a dieoff of Cladophora in the lake, but we were not able to establish a direct link between the dieoff and geosmin production. Decomposing Cladophora in shoreline areas produced a strong odour in the air. 3-Methylindole, elemental sulfur, dimethyl tetrasulfide, and dimethyl pentasulfide were tentatively identified in water samples collected from these areas, but geosmin and 2-methylisoborneol were not detected.

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