scholarly journals Biological proliferation of cesium-137 through the detrital food chain in a forest ecosystem in Japan

2014 ◽  
Vol 4 (1) ◽  
Author(s):  
Masashi Murakami ◽  
Nobuhito Ohte ◽  
Takahiro Suzuki ◽  
Nobuyoshi Ishii ◽  
Yoshiaki Igarashi ◽  
...  
Keyword(s):  
Food Chain ◽  
Forest Ecosystem ◽  
Cesium 137 ◽  
Detrital Food Chain

Bioavailability of Polychlorinated Dibenzo-p-dioxins in Lake Enclosures

1992 ◽  
Vol 49 (4) ◽  
pp. 735-742 ◽  
Author(s):  
Mark R. Servos ◽  
Derek C. G. Muir ◽  
G. R. Barrie Webster
Keyword(s):  
Water Column ◽  
Food Chain ◽  
Chain Model ◽  
Experimental Lakes Area ◽  
Northwestern Ontario ◽  
Sediment Slurry ◽  
Food Chain Model ◽  
Food Chain Transfer ◽  
Kinetics Of ◽  
Detrital Food Chain

The bioavailability of 1,3,6,8-tetra- (T4CDD) and octachlorodibenzo-p-dioxin (O8CDD) was examined in large (40 m3) lake enclosures at the Experimental Lakes Area in northwestern Ontario. The polychlorinated dioxins (PCDDs) were added to replicate enclosures as a sediment slurry at a nominal concentration of 58–59 ng∙L−1. T4CDD was more bioavailable to caged benthic invertebrates and fish (white sucker, Catostomus commersoni) than O8CDD immediately after the addition to the enclosures. However, as the concentration of T4CDD in the water column rapidly declined, the bioavailability of T4CDD also declined. Sorption of PCDD to organic matter and rapid partitioning to sediments might have reduced the uptake of PCDDs directly from the water column. Accumulation of PCDDs in biota appeared to shift from direct equilibrium partitioning during the first few days, when the concentrations in the water column were relatively high, to a detrital food chain transfer as the freely available PCDDs in the water declined. This conclusion is supported by the results of the simple, four-compartment food chain model of Thomann and Connolly based on the uptake kinetics of PCDDs from water and food.

Detrital food chain as a possible mechanism to support the trophic structure of the planktonic community in the photic zone of a tropical reservoir

Limnetica ◽  
2020 ◽  
Vol 39 (1) ◽  
pp. 511-524
Author(s):  
Edison Andrés Parra-García ◽  
Nicole Rivera-Parra ◽  
Antonio Picazo ◽  
Antonio Camacho
Keyword(s):  
Food Chain ◽  
Trophic Structure ◽  
Photic Zone ◽  
Tropical Reservoir ◽  
Planktonic Community ◽  
Detrital Food Chain

scholarly journals Modelling of radiocesium transfer in the lichen-reindeer/caribou-wolf food chain

Rangifer ◽  
1990 ◽  
Vol 10 (3) ◽  
pp. 39 ◽  
Author(s):  
D. F. Holleman ◽  
R. G. White ◽  
A. C. Allaye-Chan
Keyword(s):  
Kinetic Model ◽  
Computer Program ◽  
Food Chain ◽  
Food Selection ◽  
Potential Value ◽  
Arctic Regions ◽  
Interior Alaska ◽  
Cesium 137

The environmental contaminate radiocesium (cesium-137) has been shown to be of value as a marker in food selection and intake studies. Its greatest potential value as a food marker is in the subarctic/arctic regions, particularly in the lichen to reindeer/caribou to wolf food chain. A kinetic model describing the movement of radiocesium through the food chain has been developed using the SAAM computer program and is presented here. The program has been written so that the various paramenters affecting the transfer of radiocesium in the food chain can be altered more realistically to describe the system being modeled. The values of the parameters as given in this example are realistic for interior Alaska, however caution should be exercised in the application of the present results to regions that may be vastly different from the Alaskan interior without first evaluating the parameters and assumptions of the model.

Moving Up The Food Chain

2011 ◽  
pp. 030811155447 ◽  
Author(s):  
Lauren Wolf
Keyword(s):  
Food Chain

Clones and the Human Food Chain

2008 ◽  
Vol 38 (3) ◽  
pp. 48
Author(s):  
GREG FEERO
Keyword(s):  
Food Chain ◽  
Human Food ◽  
Human Food Chain
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