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Ecotoxicology and temporal trends of...

Moreau, Marie Francoise.

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Ecotoxicology and temporal trends of arsenic and selenium in a saline and eutrophic lake in California.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Ecotoxicology and temporal trends of arsenic and selenium in a saline and eutrophic lake in California./
Author:	Moreau, Marie Francoise.
Description:	200 p.
Notes:	Source: Dissertation Abstracts International, Volume: 68-09, Section: B, page: 5697.
Contained By:	Dissertation Abstracts International68-09B.
Subject:	Biology, Ecology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3285342
ISBN:	9780549263319

Ecotoxicology and temporal trends of arsenic and selenium in a saline and eutrophic lake in California.
Moreau, Marie Francoise.

Ecotoxicology and temporal trends of arsenic and selenium in a saline and eutrophic lake in California. - 200 p.

Source: Dissertation Abstracts International, Volume: 68-09, Section: B, page: 5697.

Thesis (Ph.D.)--University of California, Davis and San Diego State University, 2007.

The Salton Sea, the largest lake in California, receives the vast majority of its inflows from agricultural and municipal wastewaters released from increasing activities in its watershed. This saline and eutrophic lake is, nonetheless, extremely valuable as wildlife habitat and for recreational activities, therefore the impacts of contaminants on this ecosystem and human health have been of concern for decades.

ISBN: 9780549263319Subjects--Topical Terms:

1017726
Biology, Ecology.

Ecotoxicology and temporal trends of arsenic and selenium in a saline and eutrophic lake in California.
LDR:03221nam 2200289 a 45 001 938954
005 20110512
008 110512s2007 eng d
020 $a 9780549263319
035 $a (UMI)AAI3285342
035 $a AAI3285342
040 $a UMI $c UMI
100 1 $a Moreau, Marie Francoise. $3 1262928
245 1 0 $a Ecotoxicology and temporal trends of arsenic and selenium in a saline and eutrophic lake in California.
300 $a 200 p.
500 $a Source: Dissertation Abstracts International, Volume: 68-09, Section: B, page: 5697.
502 $a Thesis (Ph.D.)--University of California, Davis and San Diego State University, 2007.
520 $a The Salton Sea, the largest lake in California, receives the vast majority of its inflows from agricultural and municipal wastewaters released from increasing activities in its watershed. This saline and eutrophic lake is, nonetheless, extremely valuable as wildlife habitat and for recreational activities, therefore the impacts of contaminants on this ecosystem and human health have been of concern for decades.
520 $a To address this concern, we: (1) evaluated human and wildlife toxicological risks based on contaminant concentrations measured in tilapia (Oreochromis mossambicus) and proposed safe consumption limits for anglers; (2) extended this evaluation to two other abundant fish species present in the lake, namely bairdiella (Bairdiella icistia) and orangemouth corvina ( Cynoscion xanthulus); (3) assessed the long-term temporal changes in selenium and arsenic concentration in fish fillet from the Salton Sea and proposed a plausible biogeochemical cycle for both elements in order to explain these changes.
520 $a Both Se and inorganic As concentrations were found to be elevated enough to be of potential concern for the health of anglers. With regards to the potential impact on fish and piscivorous birds, we could not conclude whether concentrations of As pose a threat to the fish and piscivorous birds. Se concentrations could be elevated enough to negatively affect fish health, reproduction and immune systems of piscivorous birds, but definitive studies are lacking.
520 $a A General Linear Model (GLM) was constructed to test whether As and Se levels changed over the last twenty years in fish from the lake. The model revealed that Se concentrations decline significantly at an overall annual rate of 3.9 percent while As concentrations increased significantly at an estimated annual rate of 11.7 percent. Finally, we presented a set of mechanisms to explain the changes in As and Se concentrations within the lake. We conjectured that rising salinity and anthropogenic eutrophication of the lake have resulted in an increase in frequency of anoxic events in this polymictic lake, consequently favoring the development of conditions conducive to the precipitation of Se into and concomitant release of As from the sediments, thus influencing the bioavailability and bioaccumulation of the trace elements.
590 $a School code: 0860.
650 4 $a Biology, Ecology. $3 1017726
650 4 $a Biology, Limnology. $3 1018638
690 $a 0329
690 $a 0793
710 2 0 $a University of California, Davis and San Diego State University. $3 1019200
773 0 $t Dissertation Abstracts International $g 68-09B.
790 $a 0860
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3285342