Depth Distribution, Diet, and Overwinter Growth of Lake Trout (Salvelinus Namaycush) in Southeastern Lake Michigan Sampled in December 1981 and March 1982

Eck, Gary W.; Wells, LaRue

doi:10.1016/s0380-1330(86)71726-7

Cited by 34 publications

(23 citation statements)

References 4 publications

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“…There are few data on the foraging success of lake trout during winter, especially relating to light levels. Lake trout in Lake Michigan actively feed during winter and can attain up to 39% of their annual weight gain in this period (Eck and Wells 1986). In smaller lakes, more similar to Lake 373, Martin (1954) found that the percentage of empty stomachs tended to be greater in winter than at other times of the year.…”

Section: Discussionmentioning

confidence: 97%

Seasonal habitat selection by lake trout (Salvelinus namaycush) in a small Canadian shield lake: constraints imposed by winter conditions

et al. 2009

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The need for cold, well-oxygenated waters significantly reduces the habitat available for lake trout (Salvelinus namaycush) during stratification of small temperate lakes. We examined the spatial and pelagic distribution of lake trout over two consecutive summers and winters and tested whether winter increased habitat availability and access to littoral regions in a boreal shield lake in which pelagic prey fish are absent. In winter, lake trout had a narrowly defined pelagic distribution that was skewed to the upper 3 m of the water column and spatially situated in the central region of the lake. Individual core areas of use (50% Kernel utilization distributions) in winter were much reduced (75%) and spatially non-overlapping compared to summer areas, but activity levels were similar between seasons. Winter habitat selection is in contrast to observations from the stratified season, when lake trout were consistently located in much deeper waters ([6 m) and widely distributed throughout the lake. Winter distribution of lake trout appeared to be strongly influenced by ambient light levels; snow depth and day length accounted for up to 69% of the variation in daily median fish depth. More restricted habitat use during winter than summer was in contrast to our original prediction and illustrates that a different suite of factors influence lake trout distribution between these seasons.

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Section: Discussionmentioning

confidence: 97%

Seasonal habitat selection by lake trout (Salvelinus namaycush) in a small Canadian shield lake: constraints imposed by winter conditions

et al. 2009

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“…LAT muscle had the highest d 15 N values, which suggest these fish were highest in the food chain. LAT and CHS are pelagic but feed in both pelagic and benthic realms (Brandt 1986;Eck and Wells 1986). Thus, enriched d 13 C ratios were also found in both fish.…”

Section: Isotope Analysismentioning

confidence: 92%

Bioaccumulation and biomagnification of polybrominated diphenyl ethers in a food web of Lake Michigan

et al. 2009

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Polybrominated diphenyl ethers are hydrophobic chemicals and can biomagnify in food chains. Little is known about the biomagnification of PBDEs in the Lake Michigan food web. Plankton, Diporeia, lake whitefish, lake trout, and Chinook salmon were collected from Lake Michigan in 2006 between April and August. Fish liver and muscle and whole invertebrates were analyzed for six PBDEs (BDE-47, 99, 100, 153, 154, and 209). Carbon and nitrogen stable isotope ratios (delta(13)C and delta(15)N) were also quantified in order to establish the trophic structure of the food web. Geometric means of Sigma PBDE concentrations in fish ranged from 0.562 to 1.61 microg/g-lipid. BDE-209 concentrations ranged from 0.184 to 1.23 microg/g-lipid in all three fish species. Sigma BDE-47, 99, and 209 comprised 80-94% of Sigma PBDE molar concentration. Within each fish species, there were no significant differences in PBDE concentrations between liver and muscle. The highest concentration of BDE-209 (144 microg/g-lipid) was detected in Diporeia. Based on analysis of delta(15)N and PBDE concentrations, BDE-47 and 100 were found to biomagnify, whereas BDE-209 did not. A significant negative correlation between BDE-209 and trophic level was found in this food web. Biomagnification factors were also calculated and again BDE-47 and 100 biomagnified between food web members whereas BDE-209 did not. Diporeia could be one of the main dietary sources of BDE-209 for fish in Lake Michigan; BDE-47 and 100 biomagnified within this food chain; the concentration of BDE-209 decreased at higher trophic levels, suggesting partial uptake and/or biotransformation of BDE-209 in the Lake Michigan food web.

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“…This temperature lies within the thermal range in the Great Lakes from fall to spring, but is higher than that during the midwinter incubation period. Winter temperature ranges have been reported to be 4-7" C in December and 1-2" C in March in Lake Michigan (Eck & Wells 1986), and 5-11°C in October and November, 2-5°C in December, and l&C in March and April in Lake Superior (Peck 1986). For consistency we held the water temperature at 6-7" C for all of our tests.…”

Section: Sculpimmentioning

confidence: 99%

Feeding rate of slimy sculpin and burbot on young lake charr in laboratory reefs

Savino

Henry

1991

Environ Biol Fish

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SynopsisPredation and contaminants are two possible factors in the poor recruitment of young lake charr Salvelinus namaycush in the Great Lakes. We measured the feeding rate of slimy sculpins Cottus cognatus and burbot Lota lota on young lake charr (uncontaminated young from eggs of a hatchery brood stock and contaminated young from eggs of Lake Michigan lake charr) in laboratory test chambers with a cobble substrate. The median daily consumption rate of sculpins for all tests was 2 lake charr eggs (N = 22 tests; 95% confidence interval, O-13) and 2 lake charr free embryos (N = 31 tests; 95% confidence interval, O-10). Feeding rate did not differ between hatchery and contaminated prey. Slimy sculpins continued to feed on lake charr when another prey organism, the deepwater amphipod Pontoporeia hoyi, was present. Feeding by burbot on free embryos (4-36 d-l) increased as the mobility of young increased, but burbot consumed about 10% of their body weight weekly in free-swimming young (140-380 d-l). Predation on lake charr eggs by sculpins could be considerable over the 100 to 140 d incubation period, and burbot could eat large numbers of free-swimming lake charr as the young fish left the reef. Predation pressure on young lake charr may inhibit rehabilitation of self-sustaining populations of lake charr on some reefs unless a critical egg density has been reached.

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Depth Distribution, Diet, and Overwinter Growth of Lake Trout (Salvelinus Namaycush) in Southeastern Lake Michigan Sampled in December 1981 and March 1982

Cited by 34 publications

References 4 publications

Seasonal habitat selection by lake trout (Salvelinus namaycush) in a small Canadian shield lake: constraints imposed by winter conditions

Seasonal habitat selection by lake trout (Salvelinus namaycush) in a small Canadian shield lake: constraints imposed by winter conditions

Bioaccumulation and biomagnification of polybrominated diphenyl ethers in a food web of Lake Michigan

Feeding rate of slimy sculpin and burbot on young lake charr in laboratory reefs

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