Alternative Ecological Pathways in the Eastern Lake Ontario Food Web—Round Goby in the Diet of Lake Trout

2006 ◽  
Vol 32 (2) ◽  
pp. 395-400 ◽  
Author(s):  
Jason P. Dietrich ◽  
Bruce J. Morrison ◽  
James A. Hoyle
Keyword(s):  
Food Web ◽  
Lake Trout ◽  
Round Goby ◽  
Lake Ontario

Dechlorane plus monoadducts in a lake ontario (Canada) food web and biotransformation by lake trout (Salvelinus namaycush)liver microsomes

2013 ◽  
Vol 32 (6) ◽  
pp. 1376-1381 ◽  
Author(s):  
Gregg T. Tomy ◽  
Ed Sverko ◽  
Vince Palace ◽  
Bruno Rosenberg ◽  
Robert McCrindle ◽  
...  
Keyword(s):  
Food Web ◽  
Lake Trout ◽  
Liver Microsomes ◽  
Lake Ontario ◽  
Salvelinus Namaycush ◽  
Dechlorane Plus

Temporal trends of polychlorinated biphenyls (PCBs) in Lake Ontario fish and invertebrates

1999 ◽  
Vol 7 (4) ◽  
pp. 203-223 ◽  
Author(s):  
E Bentzen ◽  
D Mackay ◽  
B E Hickie ◽  
D RS Lean
Keyword(s):  
Food Web ◽  
Lake Trout ◽  
Temporal Trends ◽  
Lake Ontario ◽  
Fish Food ◽  
International Joint Commission ◽  
Analytical Protocol ◽  
Fish Lipid ◽  
Key Species ◽  
Aquatic Food

A comprehensive review is presented of changes of PCB concentrations in aquatic biota collected from Lake Ontario between 1977 and 1993, with emphasis on data for lake trout. Results of three major lake trout surveys from Canadian and United States agencies indicate lake trout PCBs have declined from the early 1980s, but changes in recent years are masked by interannual variability. These results also apply to other biota in the aquatic food web. PCB concentrations were consistent among the surveys after consideration of fish lipid content, age or size and analytical protocol. Variability of 20 to 30% in annual average estimates is attributed to both analytical and in situ sources. Current levels of PCBs in many salmonids exceed PCB consumption and wildlife protection advisories. The average half-life for PCBs in Lake Ontario biota is about 12 years and it will take three to four times that to reach the International Joint Commission target of 100 ng/g (ww) for protection of wildlife. It is essential that the design of monitoring programs ensures consistent, coordinated sampling and analysis. A monitoring strategy of annual sampling of key species supplemented with periodic intensive sampling of the entire food web (e.g., every 5 years) is suggested as more effective than current practices. There is a frequently neglected need for fuller interpretation of contaminant dynamics based on complementary research on the nature of the changing biotic and abiotic environments in a complex aquatic ecosystem like Lake Ontario. Key words: Lake Ontario, PCBs, fish, food webs, monitoring data, bioaccumulation.

Prey fish exploitation, salmonine production, and pelagic food web efficiency in Lake Ontario

1998 ◽  
Vol 55 (2) ◽  
pp. 318-327 ◽  
Author(s):  
Peter S Rand ◽  
Donald J Stewart
Keyword(s):  
Food Web ◽  
Lake Michigan ◽  
Oncorhynchus Tshawytscha ◽  
Lake Trout ◽  
Coho Salmon ◽  
Lake Ontario ◽  
Osmerus Mordax ◽  
Prey Fish ◽  
Rainbow Smelt ◽  
Time Model

Estimates of production and predation rates from bioenergetic models of chinook salmon (Oncorhynchus tshawytscha), coho salmon (Oncorhynchus kisutch), and lake trout (Salvelinus namaycush) suggest a long-term decline in their gross conversion efficiency (gross production/prey consumption) and the gross production to biomass ratio in Lake Ontario during 1978-1994. The former pattern was caused primarily by a declining trend in adult alewife (Alosa pseudoharengus) energy density during 1978-1985; the latter pattern resulted from reductions in growth rates (coho salmon) and a buildup of the older age-classes in the population (lake trout) over time. Model results suggest that over 100 and 25% of the annual production of adult alewife and rainbow smelt (Osmerus mordax), respectively, was consumed by salmonines during 1990 in Lake Ontario; hence, we claim that recent observations of reduced salmonine growth in Lake Ontario may be a result of prey limitation. Energy transfer from primary production to salmonines appeared to be more efficient in Lake Ontario than in Lake Michigan, probably due to higher stocking levels per unit area and higher densities of preferred prey fish in Lake Ontario. Through separate analyses, we arrived at conflicting conclusions concerning the sustainability of the food web configuration in Lake Ontario during 1990.

Thiamine status of lake trout in lake Ontario and its relation to diet after the colonization of round goby, 2005–2006

2021 ◽  
Author(s):  
John D. Fitzsimons ◽  
Brian Lantry ◽  
Dale C. Honeyfield ◽  
Robert O'Gorman ◽  
Scott A. Rush ◽  
...  
Keyword(s):  
Lake Trout ◽  
Round Goby ◽  
Lake Ontario

BROMINATED AND CHLORINATED FLAME RETARDANTS IN LAKE ONTARIO, CANADA, LAKE TROUT (SALVELINUS NAMAYCUSH) BETWEEN 1979 AND 2004 AND POSSIBLE INFLUENCES OF FOOD-WEB CHANGES

2009 ◽  
Vol 28 (5) ◽  
pp. 910 ◽  
Author(s):  
Nargis Ismail ◽  
Sarah B. Gewurtz ◽  
Kerri Pleskach ◽  
D. Michael Whittle ◽  
Paul A. Helm ◽  
...  
Keyword(s):  
Food Web ◽  
Flame Retardants ◽  
Lake Trout ◽  
Lake Ontario ◽  
Salvelinus Namaycush

Dynamics of the seasonal migration of Round Goby ( Neogobius melanostomus , Pallas 1814) and implications for the Lake Ontario food web

2021 ◽  
Author(s):  
Christopher M. Pennuto ◽  
Knut Mehler ◽  
Brian Weidel ◽  
Brian F Lantry ◽  
Eric Bruestle
Keyword(s):  
Food Web ◽  
Round Goby ◽  
Lake Ontario ◽  
Neogobius Melanostomus ◽  
Seasonal Migration

Using ratios of stable nitrogen and carbon isotopes to characterize the biomagnification of DDE, mirex, and PCB in a Lake Ontario pelagic food web

1995 ◽  
Vol 52 (12) ◽  
pp. 2660-2674 ◽  
Author(s):  
Richard M. Kiriluk ◽  
Mark R. Servos ◽  
D. Michael Whittle ◽  
Gilbert Cabana ◽  
Joseph B. Rasmussen
Keyword(s):  
Stable Isotopes ◽  
Food Web ◽  
Trophic Status ◽  
Lake Trout ◽  
Trophic Position ◽  
Lake Ontario ◽  
Osmerus Mordax ◽  
Rainbow Smelt ◽  
Slimy Sculpin ◽  
Pelagic Food Web

Stable isotopes of nitrogen (δ15N) and carbon (δ13C) were used to describe the trophic status and interactions of biota characteristic of a Lake Ontario pelagic food web. Stable isotopes of nitrogen were further used to characterize the relationship between an organism's trophic position and the biomagnification of specific hydrophobic contaminants through this food web. The δ15N defines the relative trophic status as (i) the top predator, lake trout (Saivelinus namaycush); (ii) prey species, alewife (Alosa pseudoharengus), rainbow smelt (Osmerus mordax), and slimy sculpin (Cottus cognatus); (iii) macroinvertebrates, mysids (Mysis relicta), and amphipods (Diporeia hoyi); (iv) net zooplankton, dominated by cyclopoids (Diacyclops thomasi) and cladocerans (Bosmina longirostris); and (v) net phytoplankton, dominated by diatoms (Melosira spp.). The separation of the four fish species, lake trout and associated prey items (alewife, rainbow smelt, and slimy sculpin), on the basis of their mean δ13C signatures complements what is known about the preferred diet of these fishes. The enrichment of 15N through this food web indicates that there is a strong correlation between the biomagnification of persistent lipophilic contaminants (p,p′-DDE, mirex, and PCB) and the relative trophic status of an organism as described by stable isotopes of nitrogen.

Evidence of successful river spawning by lake trout (Salvelinus namaycush) in the Lower Niagara River, Lake Ontario

2021 ◽  
Author(s):  
Alexander Gatch ◽  
Dimitry Gorsky ◽  
Zy Biesinger ◽  
Eric Bruestle ◽  
Kelley Lee ◽  
...  
Keyword(s):  
Lake Trout ◽  
Lake Ontario ◽  
Salvelinus Namaycush ◽  
Niagara River

Parasitic Phase of the Sea Lamprey (Petromyzon marinus) in Lake Ontario

1980 ◽  
Vol 37 (11) ◽  
pp. 2021-2038 ◽  
Author(s):  
W. J. Christie ◽  
D. P. Kolenosky
Keyword(s):  
Lake Trout ◽  
Prey Size ◽  
Lake Ontario ◽  
Sea Lamprey ◽  
Error Component ◽  
Species Preference ◽  
Fish Weight ◽  
History Of ◽  
Parasitic Phase ◽  
Parasitic Generation

Sea lamprey produced in other areas of Lake Ontario appeared to be responsible for significant levels of predation on target species of the eastern outlet basin. The life history of the lamprey is simple with only one parasitic generation present in the lake during the feeding period. Wound frequencies on gillnetted whitefish were influenced by season, fish size, gillnet set duration, and a large random error component which suggested a contagious distribution. Scar frequencies were influenced by fish age and indicated improved survival of whitefish when fish weight exceeded lamprey weight by 43 times. Lamprey impact on the whitefish stocks would probably have been more important at lower fishing intensities. The lamprey may have been prey limited, and size and species preference were probably such that lake trout and burbot were not buffered against sea lamprey by white suckers or whitefish. The analysis favored the view that lamprey were innocuous in 19th century Lake Ontario by reason of prey size and density, but climatic and other environmental effects could also have been important.Key words: sea lamprey, lake whitefish, Lake Ontario

Biomagnification of α- and γ-Hexabromocyclododecane Isomers in a Lake Ontario Food Web

2004 ◽  
Vol 38 (8) ◽  
pp. 2298-2303 ◽  
Author(s):  
Gregg T. Tomy ◽  
Wes Budakowski ◽  
Thor Halldorson ◽  
D. Michael Whittle ◽  
Micahel J. Keir ◽  
...  
Keyword(s):  
Food Web ◽  
Lake Ontario
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