CONCENTRATIONS OF ORGANOCHLORINE PESTICIDES AND POLYCHLORINATED BIPHENYLS IN AMPHIPODS (GAMMARUS LACUSTRIS) ALONG AN ELEVATION GRADIENT IN MOUNTAIN LAKES OF WESTERN CANADA

2003 ◽  
Vol 22 (11) ◽  
pp. 2605 ◽  
Author(s):  
Jules M. Blais ◽  
Frank Wilhelm ◽  
Karen A. Kidd ◽  
Derek C.G. Muir ◽  
David B. Donald ◽  
...  
Keyword(s):  
Polychlorinated Biphenyls ◽  
Organochlorine Pesticides ◽  
Elevation Gradient ◽  
Mountain Lakes ◽  
Western Canada ◽  
Gammarus Lacustris

scholarly journals Organochlorine Pesticides and Polychlorinated Biphenyls in High Mountain Lakes, Mexico

2021 ◽  
Author(s):  
Liliana García-Solorio ◽  
Claudia Muro ◽  
Isaías De La Rosa ◽  
Omar Amador-Muñoz ◽  
Guadalupe Ponce-Vélez
Keyword(s):  
Polychlorinated Biphenyls ◽  
Organochlorine Pesticides ◽  
Atmospheric Aerosol ◽  
Mountain Lakes ◽  
Tubifex Tubifex ◽  
High Mountain ◽  
High Mountain Lakes ◽  
Pollution Levels ◽  
Endosulfan Sulphate ◽  
La Luna

Abstract Pollution levels of organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) were investigated in the El Sol and the La Luna alpine lakes. The lakes are located in central Mexico, in the crater of the Nevado de Toluca volcano. The El Sol and the La Luna lakes are extremely relevant in Mexico and in the world because they are recognized as pristine regions and environmental reservoirs. Samples of atmospheric aerosol, sediment, plankton, and Tubifex tubifex were collected at three different sample locations for three years (2017, 2018, and 2019) at three different times of year, meaning that the weather conditions at the time of sampling were different. Pollutants were analysed by gas chromatography–mass spectrometry with negative chemical ionisation (GC-MS/NCI). Endosulfan was the most frequent and abundant pollutant, showing the highest peaks of all. Atmospheric aerosol revealed Σ2 = 45 pg/m3, including α and β, while sediment lakes displayed α, β and endosulfan sulphate as Σ3 = 1963 pg/g, whereas plankton and Tubifex tubifex showed Σ2 = 576 pg/g and 540 pg/g for α and β respectively. Results of endosulfan ratios (α/β) and (α-β/endosulfan sulphate) suggest that both fresh and old discharges continue to arrive at the lakesThis study shows for the first time the pollution levels of OCP and PCB in high mountain lakes in Mexico. These results that must be considered by policy makers to mitigate their use in the various productive activities of the region.

scholarly journals Serum levels of organochlorine pesticides and polychlorinated biphenyls among inhabitants of Greater Metropolitan Rio de Janeiro, Brazil

2002 ◽  
Vol 18 (2) ◽  
pp. 519-524 ◽  
Author(s):  
Isabella Fernandes Delgado ◽  
Heloisa H.C. Barretto ◽  
Teresa A. Kussumi ◽  
Irene Baptista Alleluia ◽  
Cenira de A. Baggio ◽  
...  
Keyword(s):  
Detection Limit ◽  
Polychlorinated Biphenyls ◽  
Organochlorine Pesticides ◽  
Rio De Janeiro ◽  
Serum Lipids ◽  
Serum Levels ◽  
Electron Capture Detection ◽  
Persistent Organochlorine ◽  
Alpha Beta ◽  
Janeiro City

Levels of persistent organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) were determined in the blood serum of people living and working in the urban area of greater Rio de Janeiro city. Blood samples from 33 volunteers (16 males, 17 females, 19-63 years old) were taken in January 1999. OCP residues (op'DDT, pp'DDT, pp'DDD, pp'DDE, Aldrin, Dieldrin, Endrin, Heptachlor, Heptachlor-epoxide, alpha-, beta- and gamma-Hexachlorocyclo-hexane, Hexachlorobenzene) and PCBs (congeners: 28, 52, 101, 138, 153, 180) were extracted with n-hexane and analyzed by gas chromatography with electron capture detection. Except for pp'DDE (detection limit = 1.4µg/L) no other OCP residue was found in the samples. No PCB congener (detection limit = 2.0µg/L) was detected either. pp'DDE was found in 17 out of 33 samples in concentrations that ranged from 1.4 to 8.4 µg/L of serum or, on a fat basis, from 0.200 to 3.452 µg/g of serum lipids. Percentage of positive samples (%) and levels of pp'DDE (range of positive samples) increased from the youngest to the oldest group (<=29 yrs: 10%, 0.278µg/g; 30-39 yrs: 60%, 0.200-0.765µg/g; > or = 40 yrs: 77%, 0.257-3.452µg/g).

Contribution of Gammarus lacustris to phosphorus recycling in a fishless alpine lake

1999 ◽  
Vol 56 (9) ◽  
pp. 1679-1686 ◽  
Author(s):  
Frank M Wilhelm ◽  
Jeff J Hudson ◽  
David W Schindler
Keyword(s):  
Water Column ◽  
Vertical Migration ◽  
Mountain Lakes ◽  
Plankton Community ◽  
Alpine Lake ◽  
Gammarus Lacustris ◽  
Benthic Pelagic Coupling ◽  
Phosphorus Recycling ◽  
Planktonic Community ◽  
Total P

We estimated the net P transport by Gammarus lacustris from the benthic to pelagic regions of a fishless alpine lake and compared it with P regeneration by the entire plankton community. Gammarus lacustris released between 5.2 and 18.1 ng P·L-1·h-1 (adults only and adults plus immatures, respectively) in the pelagic region during nighttime vertical migration. Additional P released into and removed from the water column due to predation on zooplankton was estimated at 1.87 and 2.3 ng P·L-1·h-1, respectively. The net daily regeneration of 52.2-181.4 ng P·L-1·day-1 by the G. lacustris population represented 9.5-32.9% of the total P regenerated by the planktonic community. The majority of the P released by G. lacustris represents "new" P to the pelagic zone because it originated in sediments. We conclude that G. lacustris can represent an important link in benthic-pelagic coupling in oligotrophic mountain lakes.

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