New and Previously Described Species of the Genus Lyrodiscus (Monogenoidea: Ancyrocephalinae) from Fishes of the Great Lakes

1973 ◽  
Vol 30 (8) ◽  
pp. 1155-1160 ◽  
Author(s):  
Alex O. Dechtiar
Keyword(s):  
Great Lakes ◽  
Lepomis Macrochirus ◽  
Lake Ontario ◽  
Pomoxis Nigromaculatus ◽  
Ambloplites Rupestris ◽  
Great Lakes Fishes

The following species of the genus Lyrodiscus are recorded from Great Lakes fishes, and comparatively or originally described: Lyrodiscus rupestris n.sp., from Ambloplites rupestris of lakes Ontario, Erie, and Huron: L. longibasus from Pomoxis nigromaculatus and P. annularis from lakes Erie and Ontario. Lyrodiscus seminolensis from Lepomis macrochirus of lakes Erie and Ontario, and L. minimus from Ambloplites rupestris of Lake Ontario. The genus Lyrodiscus is emended.

Feeding Biology of the Black Crappie, Pomoxis nigromaculatus

1968 ◽  
Vol 25 (2) ◽  
pp. 285-297 ◽  
Author(s):  
Allen Keast
Keyword(s):  
Body Length ◽  
Micropterus Salmoides ◽  
Lepomis Macrochirus ◽  
Insect Larvae ◽  
Progressive Change ◽  
Pomoxis Nigromaculatus ◽  
Feeding Biology ◽  
Ambloplites Rupestris ◽  
Gill Raker ◽  
Diptera Larvae

In Lake Opinicon, Ontario, the diet of the black crappie, Pomoxis nigromaculatus, undergoes a progressive change from one in which planktonic Crustacea and small-bodied Diptera larvae predominate (in fish of body length from about 60 to 115 mm), to a diet of insect larvae and fish (in fish 160–240 mm). Most food items prove to be midwater forms and the Diptera larvae are almost entirely Chaoborus and Procladius, which are free-swimming in the water column at night.An unusual feature is the prolonged nature of the Cladocera-Copepoda eating phase, which continues into year III and to a body length of about 160 mm. Gill-raker counts show P. nigromaculatus to have a specialized screen with 25–29 rakers on the first arch. In this it differs from cohabiting centrarchids in Lake Opinicon, Ambloplites rupestris, Micropterus salmoides, and Lepomis macrochirus, in which the rakers on the first arch number only 8–12. In these species plankton feeding is restricted to the earlier stages.

Zebra Mussels as Biomonitors for Organic Contaminants in the Lower Great Lakes

1996 ◽  
Vol 31 (2) ◽  
pp. 411-432 ◽  
Author(s):  
Michael E. Comba ◽  
Janice L. Metcalfe-Smith ◽  
Klaus L.E. Kaiser
Keyword(s):  
Great Lakes ◽  
Organic Contaminants ◽  
Lake Erie ◽  
Soft Tissues ◽  
Lake Ontario ◽  
Dry Weight ◽  
Zebra Mussels ◽  
Organic Contamination ◽  
Contamination Levels ◽  
St Lawrence River

Abstract Zebra mussels were collected from 24 sites in Lake Erie, Lake Ontario and the St. Lawrence River between 1990 and 1992. Composite samples of whole mussels (15 sites) or soft tissues (9 sites) were analyzed for residues of organochlo-rine pesticides and PCBs to evaluate zebra mussels as biomonitors for organic contaminants. Mussels from most sites contained measurable quantities of most of the analytes. Mean concentrations were (in ng/g, whole mussel dry weight basis) 154 ΣPCB, 8.4 ΣDDT, 3.5 Σchlordane, 3.4 Σaldrin, 1.4 ΣBHC, 1.0 Σendosulfan, 0.80 mirex and 0.40 Σchlorobenzene. Concentrations varied greatly between sites, i.e., from 22 to 497 ng/g for ΣPCB and from 0.08 to 11.6 ng/g for ΣBHC, an indication that mussels are sensitive to different levels of contamination. Levels of ΣPCB and Σendosulfan were highest in mussels from the St. Lawrence River, whereas mirex was highest in those from Lake Ontario. Overall, mussels from Lake Erie were the least contaminated. These observations agree well with the spatial contaminant trends shown by other biomoni-toring programs. PCB congener class profiles in zebra mussels are also typical for nearby industrial sources, e.g., mussels below an aluminum casting plant contained 55% di-, tri- and tetrachlorobiphenyls versus 31% in those upstream. We propose the use of zebra mussels as biomonitors of organic contamination in the Great Lakes.

A probabilistic assessment of the impairment status of areas of concern in the Laurentian great lakes: How far are we from delisting the Hamilton Harbour, Lake Ontario, Canada?

2021 ◽  
pp. 101271
Author(s):  
Ariola Visha ◽  
Alexander Lau ◽  
Cindy Yang ◽  
Satyendra P. Bhavsar ◽  
David Depew ◽  
...  
Keyword(s):  
Great Lakes ◽  
Lake Ontario ◽  
Laurentian Great Lakes ◽  
Probabilistic Assessment ◽  
Hamilton Harbour ◽  
Areas Of Concern

20. The Description to Look Down on All Opposition”: The Remains of HMS St. Lawrence

2018 ◽  
Author(s):  
Aaron Styba
Keyword(s):  
Great Lakes ◽  
Lake Ontario ◽  
Balance Of Power ◽  
War Of 1812 ◽  
Western Hemisphere ◽  
Nuclear Bomb ◽  
Joint Investigation ◽  
Queen's University ◽  
Parks Canada

In one of the most ignominious wars in history, a combined force of British and Canadian soldiers, sailors and civilians constructed the largest wooden warship ever built in the western hemisphere. Engaged with the Americans in a desperate game of cat-and-mouse upon Lake Ontario, the massive warship HMS St. Lawrence swung the balance of power firmly in favour of the British and thereby hastened the signing of the Treaty of Ghent, bringing the War of 1812 to a sputtering halt.This colossal warship, over 200 feet long, crewed by 700 and carrying 112 cannon, was completed at Kingston, Ontario in little over 9 months. Patrolling Lake Ontario, HMS St. Lawrence immediately caused the Americans to flee to their harbour. Astoundingly, and in a very Canadian fashion, she never fired a shot in combat.After the war ended, years of disrepair and dereliction left HMS St. Lawrence as a hulk of her former self. Sold to a local entrepreneur for a measly £25, she found herself towed to a location near Queen’s University. Mysteriously, she then disappeared from history. After the consideration of several theories, the hope is that this presentation, based upon the research conducted in a joint investigation by Parks Canada, the Marine Museum of the Great Lakes and Queen’s University, will help determine the fate of this “nuclear bomb of her age.”This presentation will outline the fascinating origins of HMS St. Lawrence, how she was archaeological documented, what the investigation tells us, and why investigating naval heritage is a worthy undertaking.

Sexual differences in accumulation of mercury in four species of centrarchid fishes

1988 ◽  
Vol 66 (4) ◽  
pp. 944-949 ◽  
Author(s):  
Paul F. Nicoletto ◽  
Albert C. Hendricks
Keyword(s):  
Lepomis Macrochirus ◽  
Mercury Content ◽  
Lepomis Gibbosus ◽  
South Fork ◽  
The South ◽  
Male And Female ◽  
Rock Bass ◽  
Males And Females ◽  
Redbreast Sunfish ◽  
Ambloplites Rupestris

A 3-year study of fish from the South River, and the South Fork of the Shenandoah River, and the Shenandoah River in Virginia revealed significant differences in the muscle mercury content of males and females. Female rock bass, Ambloplites rupestris, redbreast sunfish, Lepomis auritus, pumpkinseed, Lepomis gibbosus, and bluegill, Lepomis macrochirus contained higher levels of mercury than the males of each species. An analysis of these species indicated that sex-related differences in mercury levels were not due to differences in body size but may have been related to the onset of reproduction. For example, mercury levels in 1-year-old male and female redbreast sunfish were not significantly different: females averaged 0.66 μg Hg/g and males averaged 0.63 μg Hg/g. However, at 2 years of age, when redbreast sunfish first reproduce, females contained significantly more mercury than males: females averaged 0.84 μg Hg/g and males averaged 0.60 μg Hg/g. Analysis of the other species yielded similar results.

Genetic Identification and Implications of Another Invasive Species of Dreissenid Mussel in the Great Lakes

1992 ◽  
Vol 49 (7) ◽  
pp. 1501-1506 ◽  
Author(s):  
Bernie May ◽  
J. Ellen Marsden
Keyword(s):  
Great Lakes ◽  
Dreissena Polymorpha ◽  
Low Frequency ◽  
Lake Ontario ◽  
Acute Angle ◽  
Shell Morphology ◽  
Genetic Identification ◽  
Species Identity ◽  
Allozyme Loci ◽  
Dreissenid Mussel

In this paper we report the discovery and implications of a second nonindigenous species of dreissenid mussel in the Great Lakes. This species was detected in a routine screening of zebra mussels (Dreissena polymorpha) for allozyme variability. The two species differ at allozyme loci (Nei's I = 0.30 using 12 loci) and in their shell morphology (the second species lacks the acute angle, or carina, between the ventral and dorsal surfaces of the shell of the zebra mussel). As a working name, at least until its species identity is discovered, we have called the new species the "quagga mussel." Currently, this mussel occurs in Lake Ontario in equal frequencies with D. polymorpha. Its low frequency of occurence in neighboring waters (e.g. the Erie canal, Niagara River, and outlet to Onondaga Lake) and lack of occurrence in any of the other Great Lakes suggest that (1) its point of introduction to North America was in Lake Ontario and (2) its range may expand.

Invasion of Lake Ontario by the Ponto–Caspian predatory cladoceran Cercopagis pengoi

1999 ◽  
Vol 56 (1) ◽  
pp. 1-5 ◽  
Author(s):  
Hugh J MacIsaac ◽  
Igor A Grigorovich ◽  
James A Hoyle ◽  
Norman D Yan ◽  
Vadim E Panov
Keyword(s):  
Great Lakes ◽  
Ballast Water ◽  
Lake Ontario ◽  
Resting Eggs ◽  
The Body ◽  
Population Densities ◽  
Exchange Programs ◽  
Neva Estuary ◽  
Cercopagis Pengoi ◽  
Source Populations

Cercopagis pengoi, a waterflea native to the Ponto-Caspian region, was discovered during 1998 in Lake Ontario. Individuals were found throughout the lake during summer snagged on sportfishing lines. The population included parthenogenetic (92%) and sexual (2%) females and males (6%). Cercopagis has a very long caudal appendage that is more than five times the body length and terminates in a distinctive loop. Females and males from Lake Ontario were significantly smaller than individuals from the Neva Estuary, Baltic Sea. In Eurasia, C. pengoi occurs in relatively warm fresh and brackish waters (0-14‰) at population densities usually <3000 individuals·m-3; mean and maximum population densities in Lake Ontario were 170 and 322 individuals·m-3, respectively. The presence of females with resting eggs indicates that Cercopagis will likely establish in Lake Ontario. As with other recently introduced invertebrates, Cercopagis likely was transported to the Great Lakes in ballast water from eastern Europe. The rapid influx of Ponto-Caspian species into the Great Lakes warrants further study including identification of source populations, mechanisms of dispersal, impacts on recipient ecosystems, and efficacy of ballast water exchange programs.

SPATIAL DISTRIBUTION OF POLYCHLORINATED NAPHTHALENES IN AIR OVER THE GREAT LAKES AND AIR–WATER GAS EXCHANGE IN LAKE ONTARIO

2003 ◽  
Vol 22 (9) ◽  
pp. 1937 ◽  
Author(s):  
Paul A. Helm ◽  
Liisa M. Jantunen ◽  
Jeff Ridal ◽  
Terry F. Bidleman
Keyword(s):  
Spatial Distribution ◽  
Gas Exchange ◽  
Great Lakes ◽  
Lake Ontario ◽  
Polychlorinated Naphthalenes ◽  
Water Gas

Modification of Great Lakes Regulation Plans for Simulation of Maximum Lake Ontario Outflows

1994 ◽  
Vol 20 (3) ◽  
pp. 569-582 ◽  
Author(s):  
Deborah H. Lee ◽  
Frank H. Quinn ◽  
Douglas Sparks ◽  
Jean Claude Rassam
Keyword(s):  
Great Lakes ◽  
Lake Ontario
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