DDT Residues in Euphausiids in the Upper Estuary of the Gulf of St. Lawrence

1975 ◽  
Vol 32 (2) ◽  
pp. 310-314 ◽  
Author(s):  
D. D. Sameoto ◽  
D. C. Darrow ◽  
S. Guildford
Keyword(s):  
Significant Variation ◽  
Organochlorine Residue ◽  
Residue Levels ◽  
Meganyctiphanes Norvegica ◽  
Saguenay River ◽  
Gaspe Peninsula ◽  
Gaspé Peninsula

No significant variation was found in organochlorine residue levels between different stations in an area from the Saguenay River to the end of the Gaspé Peninsula in the Gulf of St. Lawrence for the euphausiids Thysanöessa raschii, T. inermis, and Meganyctiphanes norvegica. Significant differences were found between the concentration of organochlorine residues for M. norvegica and the Thysanöessa species, but there was no difference between the two Thysanöessa species.Significantly lower values for percent lipid were found in T. inermis and T. raschii between June 1973 and May 1974 samples, but the total amount of organochlorine residues did not change. This suggests that these species do not lose p,p′-DDT when they metabolize lipids for energy or the production of gonad material.

Variation of Organochlorine Residue Levels with Age in Gulf of St. Lawrence Harp Seals (Pagophilus groenlandicus)

1973 ◽  
Vol 30 (5) ◽  
pp. 595-600 ◽  
Author(s):  
R. F. Addison ◽  
S. R. Kerr ◽  
J. Dale ◽  
D. E. Sergeant
Keyword(s):  
Rank Correlation ◽  
Residue Level ◽  
Organochlorine Residue ◽  
Published Data ◽  
Age Changes ◽  
Pagophilus Groenlandicus ◽  
Proportional Increase ◽  
Residue Concentration ◽  
Residue Levels ◽  
Saguenay River

Blubber samples from 18 harp seals taken near the Saguenay River in the Gulf of St. Lawrence were analysed for DDT metabolites, PCBs, and dieldrin. The concentration of total DDT and metabolites [Formula: see text] ranged from 3.1 to 22.6 ppm, PCBs (as Aroclor® 1254) from 2 to 22 ppm, dieldrin from 0.1 to 0.3 ppm of blubber. Rank correlation of residue level and age indicated that significant portions of the [Formula: see text] and PCB variance could be assigned to increased residue levels with age. Within the [Formula: see text] group, DDE alone showed a strong proportional increase in concentration with age. Dieldrin concentration was not appreciably correlated with age. Among factors other than age, changes in blubber thickness did not account for any significant amount of the variance in blubber residue concentration. Examination of other published data suggested that parturition and/or lactation may cause reductions in blubber residue concentrations.

Weather and Outbreaks of the Spruce Budworm in the Province of Quebec from 1939 to 1956

1961 ◽  
Vol 93 (2) ◽  
pp. 118-123 ◽  
Author(s):  
J. G. Pilon ◽  
J. R. Blais
Keyword(s):  
Choristoneura Fumiferana ◽  
Abies Balsamea ◽  
Spruce Budworm ◽  
Balsam Fir ◽  
The Past ◽  
Forest Regions ◽  
Tree Component ◽  
Gaspe Peninsula ◽  
Gaspé Peninsula

Nearly all forest regions in the Province of Quebec where balsam fir (Abies balsamea (L.) Mill.) is an important tree component have been subjected to severe defoliation by the spruce budworm, Choristoneura fumiferana (Clem.), during the past 20 years. These outbreaks have followed an easterly direction beginning near the Ontario-Quebec border in 1939 and ending in the Gaspé Peninsula in 1958.

Gaspe Peninsula

1924 ◽  
Vol 14 (2) ◽  
pp. 325
Author(s):  
F. J. Alcock ◽  
J. M. Clarke
Keyword(s):  
Gaspe Peninsula ◽  
Gaspé Peninsula

The Gaspé Peninsula: new gravity and aeromagnetic datasets and their enhancement

2006 ◽  
Author(s):  
P Brouillette ◽  
N Pinet ◽  
P Keating ◽  
D Lavoie ◽  
D -J Dion ◽  
...  
Keyword(s):  
Gaspe Peninsula ◽  
Gaspé Peninsula

scholarly journals Multi-residue levels of organophosphorus pesticides in cocoa beans from some cocoa farms in Ekiti state, Nigeria

2017 ◽  
Vol 52 (4) ◽  
pp. 281-288 ◽  
Author(s):  
OA Ibigbami ◽  
AF Aiyesanmi ◽  
EI Adeyeye ◽  
AO Adebayo ◽  
RD Aladesanwa
Keyword(s):  
Significant Variation ◽  
Organophosphorus Pesticides ◽  
Detectable Level ◽  
The European Union ◽  
Gas Chromatograph ◽  
Cocoa Beans ◽  
Significant Difference ◽  
Maximum Residue Limits ◽  
Pirimiphos Methyl ◽  
Residue Levels

This study investigated the level and occurrence of 13 organophosphorus pesticides (OPPs) residues in cocoa beans from some cocoa farms in Ekiti state, Nigeria. The pesticides in the cocoa beans were extracted and cleaned up on silica gel adsorbent. A gas chromatograph coupled with flame photometric detector (FPD) was used to quantify the pesticides. The reliability of the analytical method was examined by spiking the beans with known concentration of the pesticides and analysed following similar procedure of extraction and clean-up. The percentage of pesticides recovered ranged from 88% to 92%. Dichlorvos, mevinfos, diazinon, chlorpyrifos, dimethoate and parathion were detected with varying concentration in the bean samples whilst phosphamidon, pirimiphos-methyl, fenthion, bromophos, isofenfos, diclofenthion and ethion showed no detectable level. The concentration of OPPs ranged from ND - 58μg/kg and ND - 85μg/kg for the dry and wet seasons respectively. Analysis of variance (ANOVA) showed no significant variation (p ˃ 0.05) in the levels of all detectable pesticides among the sampled farms whilst dichlorvos, diazinon, dimethoate and chlorpyrifos showed significant difference between both seasons. Residual levels of these detectable pesticides were below the maximum residue limits (MRLs) set by the European Union in food. Hence, the cocoa beans from the study areas are considered safe for consumption.Bangladesh J. Sci. Ind. Res. 52(4), 281-288, 2017

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