North American Journal of Fisheries Management, 2006
Reliable estimates of fish biomass are vital to the management of aquatic ecosystems and their as... more Reliable estimates of fish biomass are vital to the management of aquatic ecosystems and their associated fisheries. Acoustic and midwater trawl surveys are an efficient sampling method for estimating fish biomass in large bodies of water. To improve the precision of biomass estimates from combined acoustic and midwater trawl surveys, sampling effort should be optimally allocated within each stage of
Polybrominated diphenyl ether (PBDE) flame-retardants have been identified as an emergent contami... more Polybrominated diphenyl ether (PBDE) flame-retardants have been identified as an emergent contaminants issue in many parts of the world. In vitro analyses were conducted to test the hypothesis that selected PBDEs congeners affect viability, apoptosis, and necrosis of thymocytes from laboratory-reared lake trout (Salvelinus namaycush). At current environmental levels (< 1 mg/L), effects of the tested PBDEs on thymocytes were negligible. However, at 100 mg/L, major effects were seen for congener brominated diphenyl ether 47 (BDE-47) and minor effects were seen for congener BDE-99.
The ability of planktivorous fishes to exert top-down control on Bythotrephes potentially has far... more The ability of planktivorous fishes to exert top-down control on Bythotrephes potentially has far-reaching impacts on aquatic food-webs, given previously described effects of Bythotrephes on zooplankton communities. We estimated consumption of Bythotrephes by planktivorous and benthivorous fishes, using bioenergetics and daily ration models at nearshore (18 m), intermediate (46 m), and offshore (110 m) depths along one western Lake Superior transect (April, and September–November) and two northern Lake Michigan transects (April, July, and September). In Lake Superior, consumption (primarily by cisco Coregonus artedi) exceeded Bythotrephes production at all offshore sites in September–November (up to 396% of production consumed) and at the intermediate site in November (842%) with no evidence of consumption nearshore. By comparing Bythotrephes biomass following months of excessive consumption, we conservatively concluded that top-down control was evident only at the offshore site dur...
North American Journal of Fisheries Management, 2006
Reliable estimates of fish biomass are vital to the management of aquatic ecosystems and their as... more Reliable estimates of fish biomass are vital to the management of aquatic ecosystems and their associated fisheries. Acoustic and midwater trawl surveys are an efficient sampling method for estimating fish biomass in large bodies of water. To improve the precision of biomass estimates from combined acoustic and midwater trawl surveys, sampling effort should be optimally allocated within each stage of
Transactions of the American Fisheries Society, 2010
... Janssen, J. and Jude, DJ 2001. ... [CrossRef], [Web of Science ®], [CSA] View all references;... more ... Janssen, J. and Jude, DJ 2001. ... [CrossRef], [Web of Science ®], [CSA] View all references; Lund et al. 200936. Lund, SS, Landkildehus, F., Søndergaard, M., Lauridsen, TL, Egemose, S., Jensen, HS, Andersen, FØ, Johansson, LS, Ventura, M. and Jeppesen, E. 2009. ...
North American Journal of Fisheries Management, 2006
Reliable estimates of fish biomass are vital to the management of aquatic ecosystems and their as... more Reliable estimates of fish biomass are vital to the management of aquatic ecosystems and their associated fisheries. Acoustic and midwater trawl surveys are an efficient sampling method for estimating fish biomass in large bodies of water. To improve the precision of biomass estimates from combined acoustic and midwater trawl surveys, sampling effort should be optimally allocated within each stage of
Polybrominated diphenyl ether (PBDE) flame-retardants have been identified as an emergent contami... more Polybrominated diphenyl ether (PBDE) flame-retardants have been identified as an emergent contaminants issue in many parts of the world. In vitro analyses were conducted to test the hypothesis that selected PBDEs congeners affect viability, apoptosis, and necrosis of thymocytes from laboratory-reared lake trout (Salvelinus namaycush). At current environmental levels (< 1 mg/L), effects of the tested PBDEs on thymocytes were negligible. However, at 100 mg/L, major effects were seen for congener brominated diphenyl ether 47 (BDE-47) and minor effects were seen for congener BDE-99.
The ability of planktivorous fishes to exert top-down control on Bythotrephes potentially has far... more The ability of planktivorous fishes to exert top-down control on Bythotrephes potentially has far-reaching impacts on aquatic food-webs, given previously described effects of Bythotrephes on zooplankton communities. We estimated consumption of Bythotrephes by planktivorous and benthivorous fishes, using bioenergetics and daily ration models at nearshore (18 m), intermediate (46 m), and offshore (110 m) depths along one western Lake Superior transect (April, and September–November) and two northern Lake Michigan transects (April, July, and September). In Lake Superior, consumption (primarily by cisco Coregonus artedi) exceeded Bythotrephes production at all offshore sites in September–November (up to 396% of production consumed) and at the intermediate site in November (842%) with no evidence of consumption nearshore. By comparing Bythotrephes biomass following months of excessive consumption, we conservatively concluded that top-down control was evident only at the offshore site dur...
North American Journal of Fisheries Management, 2006
Reliable estimates of fish biomass are vital to the management of aquatic ecosystems and their as... more Reliable estimates of fish biomass are vital to the management of aquatic ecosystems and their associated fisheries. Acoustic and midwater trawl surveys are an efficient sampling method for estimating fish biomass in large bodies of water. To improve the precision of biomass estimates from combined acoustic and midwater trawl surveys, sampling effort should be optimally allocated within each stage of
Transactions of the American Fisheries Society, 2010
... Janssen, J. and Jude, DJ 2001. ... [CrossRef], [Web of Science ®], [CSA] View all references;... more ... Janssen, J. and Jude, DJ 2001. ... [CrossRef], [Web of Science ®], [CSA] View all references; Lund et al. 200936. Lund, SS, Landkildehus, F., Søndergaard, M., Lauridsen, TL, Egemose, S., Jensen, HS, Andersen, FØ, Johansson, LS, Ventura, M. and Jeppesen, E. 2009. ...
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