Isomers of Dechlorane Plus in Lake Winnipeg and Lake Ontario Food Webs

We examined how the lipid content and fatty acid composition of walleye (Sander vitreus) ova varied with respect to maternal characteristics, particularly indices of body nutrient reserves, within three spawning populations that varied in maternal age, size, and somatic lipid reserves. We also compared the variability in ova lipid composition among three populations with that observed among spawning years within one of these populations. Maternal characteristics had little influence on ova lipid content. In Lake Ontario, percentages of docosahexaenoic acid (22:6(n-3), DHA) and arachidonic acid (20:4(n-6), AA) increased with maternal length, while those of eicosapentaenoic acid (20:5(n-3), EPA) declined. In Lake Nipissing, maternal age had similar effects on AA and EPA, but not DHA. The Lake Winnipeg population did not conform to the trends of the other two populations, and ova from this population had very low levels of AA. We hypothesize that there are similar selection pressures on the Lake Ontario and Lake Nipissing populations with respect to desirable ova fatty acid profiles. Lake Winnipeg walleye may experience different selection pressures or may be unable to conform to the trends observed in the other two lakes.

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Compounds Structurally Related to Dechlorane Plus in Sediment and Biota from Lake Ontario (Canada)

Environmental Science & Technology ◽

10.1021/es9025535 ◽

2010 ◽

Vol 44 (2) ◽

pp. 574-579 ◽

Cited By ~ 73

Author(s):

Ed Sverko ◽

Eric J. Reiner ◽

Gregg T. Tomy ◽

Robert McCrindle ◽

Li Shen ◽

...

Keyword(s):

Lake Ontario ◽

Dechlorane Plus

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Dechlorane Plus Biomagnification and Transmission through Prairie Food Webs in Inner Mongolia, China

Environmental Toxicology and Chemistry ◽

10.1002/etc.4923 ◽

2020 ◽

Author(s):

Wenming Chen ◽

Junsong Bao ◽

Te Bu ◽

Hongli Jin ◽

Yiming Liu ◽

...

Keyword(s):

Food Webs ◽

Inner Mongolia ◽

Dechlorane Plus

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Screening-Level Versus Refined Modeling Approaches to Estimating PCB Concentrations in Aquatic Food Webs: A Case Study of Lake Ontario

Environmental Toxicology and Risk Assessment: Third Volume ◽

10.1520/stp12687s ◽

2009 ◽

pp. 111-111-22

Author(s):

PK Scott ◽

KR Trowbridge

Keyword(s):

Food Webs ◽

Lake Ontario ◽

Modeling Approaches ◽

Aquatic Food Webs ◽

Level Versus ◽

Aquatic Food

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Efficiencies of Various Grabs and Corers in Sampling Freshwater Benthos

Journal of the Fisheries Research Board of Canada ◽

10.1139/f70-191 ◽

1970 ◽

Vol 27 (10) ◽

pp. 1691-1700 ◽

Cited By ~ 51

Author(s):

John F. Flannagan

Keyword(s):

Lake Ontario ◽

Lake Winnipeg ◽

Soft Sediments ◽

Core Samples ◽

Quantitative Results ◽

Small Improvement ◽

Better Than

None of several samplers compared in limited tests in Lake Ontario gave realistic estimates of benthos in all substrates encountered. The Ponar and Shipek grabs, the only samplers that functioned in gravel, came closest to all-sediment samplers. In sand, however, the Franklin–Anderson grab appeared to be much more efficient than either of these two samplers. In mud the Ekman grabs gave the highest mean numbers of animals per m2.In trials in Lake Winnipeg profundal mud, hand-taken diver's core samples being used as a quantitative standard, only the Fisheries Research Board multiple corer and the standard Ekman grab gave quantitative results for total macrobenthos. However, the multiple corer collected significantly fewer chironomids, and the standard Ekman grab significantly fewer oligochaetes, than did the diver's cores. There were indications that the tall Ekman grab was either not tall enough or too heavily weighted for use in soft sediments and that a small improvement in design could make both this and the standard Ekman more efficient. Most of the samplers apparently sampled some groups of organisms much better than others. Neither the Ponar grab nor the tall weighted Ekman grab sampled the chironomid or oligochaete populations satisfactorily. However, both grabs indicated densities of sphaeriids not significantly different from the diver's samples.

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