Metal accumulation in Lake Michigan prey fish: Influence of ontogeny, trophic position, and habitat

2021 ◽  
Author(s):  
Whitney M. Conard ◽  
Brandon S. Gerig ◽  
Lea M. Lovin ◽  
David B. Bunnell ◽  
Gary A. Lamberti
Keyword(s):  
Lake Michigan ◽  
Metal Accumulation ◽  
Trophic Position ◽  
Prey Fish

scholarly journals Trace metal concentration in wild avian species from Campania, Italy

2011 ◽  
Vol 9 (1) ◽  
pp. 86-93 ◽  
Author(s):  
Annalisa Zaccaroni ◽  
Camilla Niccoli ◽  
Giulia Andreani ◽  
Dino Scaravelli ◽  
Maria Ferrante ◽  
...  
Keyword(s):  
Metal Accumulation ◽  
Southern Italy ◽  
Feeding Habits ◽  
Trace Metal Concentration ◽  
Insectivorous Birds ◽  
Prey Fish ◽  
Cd Accumulation ◽  
Metal Levels ◽  
Order Of Magnitude ◽  
Trace Element Levels

AbstractThis study was conducted to determine heavy metals concentrations in tissues of 94 birds belonging to different species from coastal areas of Naples and Salerno (Southern Italy) in order to provide baseline data concerning trace element levels in wild birds living in or close to an area characterized by high anthropogenic impact. Additional aim of this study was to verify if diet influenced metal accumulation, so birds were classified as birds of prey, fish eating birds and insectivorous birds. Kidney was the primary organ for Cd accumulation in all groups considered, Pb was accumulated preferentially in bone, whereas Hg showed high values in liver of fish eating birds. Zn showed the highest mean concentrations, while Cu levels were one order of magnitude less. The variance analysis with respect to feeding habits disclosed only a lower accumulation of Hg in insectivores with respect to the other groups. For all metals, the concentrations measured in tissues should be considered indicative of chronic exposure to low, “background” environmental levels and/or to the presence of low bioavailable metals in the environment. In addition, metal levels were not of toxicological concern, being always well below the toxic thresholds defined for each metal.

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.

Historical trophic position of Limnocalanus macrurus in Lake Michigan

2014 ◽  
Vol 40 (4) ◽  
pp. 1027-1032 ◽  
Author(s):  
Jonathan P. Doubek ◽  
John T. Lehman
Keyword(s):  
Lake Michigan ◽  
Trophic Position ◽  
Limnocalanus Macrurus

Egg Fatty Acid Composition from Lake Trout Fed Two Lake Michigan Prey Fish Species

2009 ◽  
Vol 21 (4) ◽  
pp. 272-278 ◽  
Author(s):  
Dale C. Honeyfield ◽  
John D. Fitzsimons ◽  
Donald E. Tillitt ◽  
Scott B. Brown
Keyword(s):  
Fatty Acid Composition ◽  
Fatty Acid ◽  
Acid Composition ◽  
Fish Species ◽  
Lake Michigan ◽  
Lake Trout ◽  
Prey Fish

scholarly journals Spatiotemporal variability in energetic condition of alewife and round goby in Lake Michigan

2019 ◽  
Vol 76 (11) ◽  
pp. 1982-1992 ◽  
Author(s):  
David B. Bunnell ◽  
Steven A. Pothoven ◽  
Patricia M. Armenio ◽  
Lauren Eaton ◽  
David M. Warner ◽  
...  
Keyword(s):  
Great Lakes ◽  
Lake Michigan ◽  
Round Goby ◽  
Neogobius Melanostomus ◽  
Spatiotemporal Variability ◽  
Future Research ◽  
Alosa Pseudoharengus ◽  
Prey Fish ◽  
Important Prey ◽  
Energetic Condition

Pelagic-oriented alewife (Alosa pseudoharengus) and benthic-oriented round goby (Neogobius melanostomus) are two important prey fishes in the Laurentian Great Lakes. In 2015, we evaluated their seasonal total energy (TE) across nine Lake Michigan transects. Round goby contained at least 48% more kilojoules of TE than alewife of equal length during spring and summer. TE varied spatially for both species, but only large alewife exhibited a consistent pattern, with higher values along the eastern shoreline. Variation in TE was not explained by site-specific prey densities for either species. Round goby energy density (ED) was higher in Lake Michigan than in central Lake Erie, but comparable to other regions of the Great Lakes. Alewife ED in 2015 was similar to that in 2002–2004 in Lake Michigan, with the exception of November (small alewife ED was 21% higher) and April (large alewife ED was 30% lower). Despite oligotrophication, our study suggests that starvation of juvenile and adults has not been directly contributing to overall declining prey fish abundance, although future research should evaluate the potential for overwinter starvation.

Effect of lake-wide planktivory by the pelagic prey fish community in Lakes Michigan and Ontario

1995 ◽  
Vol 52 (7) ◽  
pp. 1546-1563 ◽  
Author(s):  
Peter S. Rand ◽  
Donald J. Stewart ◽  
Brian F. Lantry ◽  
Lars G. Rudstam ◽  
Ora E. Johannsson ◽  
...  
Keyword(s):  
Lake Michigan ◽  
Supply And Demand ◽  
Lake Ontario ◽  
Production Model ◽  
Trophic Relationships ◽  
Prey Fish ◽  
Prey Resources ◽  
Wet Weight ◽  
Pelagic Prey ◽  
Zooplankton Production

We compared predatory demand by pelagic planktivorous prey fish with invertebrate production in Lake Michigan during 1987 and in Lake Ontario during 1990. Predation by the planktivores in Lake Ontario was nearly fourfold higher than in Lake Michigan (approx. 87 g wet weight∙m−2∙year−1). Predation rates on Mysis were comparable in Lakes Michigan and Ontario (approx. 21 g∙m−2∙year−1), while predation on Diporeia was markedly higher in Lake Michigan than in Lake Ontario (21.3 vs. 8.5 g wet weight∙m−2∙year−1). In Lake Ontario, predatory demand on zooplankton exceeded our best estimate of production by a factor of 1.7. Similarly, predation estimates on Mysis in Lake Ontario were 1.2–2.0 times the estimated rate of production, depending on the production model used. Lake Michigan planktivores consumed approximately 55% of available zooplankton production in 1987, indicating that competition for prey resources, if operating, was not as intense as that in Lake Ontario in 1990. It is unclear how to resolve the paradox that predation could markedly exceed available prey production in some cases. There could be sources of error in the estimates of both the supply and demand sides of these trophic relationships.

Within- and among-population variation in the trophic position of a pelagic predator, lake trout (Salvelinus namaycush)

2000 ◽  
Vol 57 (4) ◽  
pp. 725-731 ◽  
Author(s):  
M Jake Vander Zanden ◽  
Brian J Shuter ◽  
Nigel P Lester ◽  
Joseph B Rasmussen
Keyword(s):  
Body Size ◽  
Total Variation ◽  
Lake Trout ◽  
Prey Size ◽  
Trophic Position ◽  
Feeding Habits ◽  
Salvelinus Namaycush ◽  
Population Variation ◽  
Prey Fish ◽  
Fish Trophic Position

Many aquatic consumers have flexible feeding habits, and the diet and trophic position of a species can be expected to vary both within and among populations. In this study, we quantify the importance of both within- and among-population trophic variation for lake trout (Salvelinus namaycush) using stable isotope designations of trophic position from 13 Ontario and Quebec lakes. Lake-to-lake differences explained 78% of the total variation in lake trout trophic position. Analysis using both stable isotopes and published dietary data demonstrated that the trophic position of lake trout failed to increase appreciably as a function of animal body size. This finding was attributed to weak predator size - prey size relationships as well as to there being no relationship between prey fish trophic position and body size. The variance in trophic position of a population reflects the extent to which individuals forage as trophic specialists; however, we did not identify any one factor that was correlated with within-population trophic variation. Our finding that much of the total variation in trophic position represents among-population differences indicates that considering the average trophic position of a population does not mask substantial within-population trophic variation.

Accumulation of PCBs by Lake Trout (Salvelinus namaycush): An Individual-Based Model Approach

1993 ◽  
Vol 50 (1) ◽  
pp. 97-109 ◽  
Author(s):  
Charles P. Madenjian ◽  
Stephen R. Carpenter ◽  
Gary W. Eck ◽  
Michael A. Miller
Keyword(s):  
Uncertainty Analysis ◽  
Lake Michigan ◽  
Lake Trout ◽  
Salvelinus Namaycush ◽  
Prey Fish ◽  
Age Classes ◽  
Individual Based Model ◽  
Trout Population ◽  
Different Levels ◽  
Model Approach

To explain the variation in growth and in concentration of polychlorinated biphenyls (PCBs) among individual fish, an individual-based model (IBM) was applied to the lake trout (Salvelinus namaycush) population in Lake Michigan. The IBM accurately represented the variation in growth exhibited by the different age classes of lake trout. Uncertainty analysis of the IBM revealed that mean PCB concentration for the lake trout population was most sensitive to PCB concentration in their prey. The variability in PCB concentration among lake trout individuals was not adequately explained by the IBM, unless variation in prey fish PCBs was included in the model. To accomplish this, the simulated lake trout population was divided into subsets subjected to different levels of PCB concentration in the prey fish. Thus, model results indicated that variability in prey fish PCB concentration was an important component of the variation in PCB concentration observed among individual lake trout comprising the Lake Michigan population.

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