Selenium and water quality in three wetland types along the Lower Colorado River - Imperial National Wildlife Refuge, Arizona

Persistent Link:
http://hdl.handle.net/10150/192104
Title:
Selenium and water quality in three wetland types along the Lower Colorado River - Imperial National Wildlife Refuge, Arizona
Author:
Prieto, Felipe Garcia.
Issue Date:
1998
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
Wetlands along the Lower Colorado River are divided into three types based on degree of connectivity to the river mainstem: connected lakes, pseudo seeps, and true seeps. In general, water quality and selenium levels in biota decrease with decreased connectivity to the river, i.e., true seeps have the poorest water quality and lowest selenium burdens, connected lakes have water quality equal to the river and the highest selenium levels, and pseudo seeps have water quality slightly improved over that in connected lakes and lower selenium levels. Based on selenium standards developed by Lemly (1995), selenium concentrations in fish but not crayfish were sufficiently elevated to pose bioaccumulation problems, though none were apparent in our study .Of the three wetland types, pseudo seeps have the most desirable combination of high water quality and modest selenium levels. Additionally, pseudo seeps may harbor the highest biodiversity of the three wetland types present in the LCR. The lack of apparent problems from elevated selenium levels raises many questions concerning selenium dynamics and cycling in the LCR. Management requires knowledge of selenium levels in individual wetland types and an understanding of selenium cycling.
Type:
Thesis-Reproduction (electronic); text
LCSH Subjects:
Hydrology.; Wetland ecology -- Arizona.; Selenium cycle -- Arizona.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Renewable Natural Resources; Graduate College
Degree Grantor:
University of Arizona
Committee Chair:
McIvor, Carole C.

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleSelenium and water quality in three wetland types along the Lower Colorado River - Imperial National Wildlife Refuge, Arizonaen_US
dc.creatorPrieto, Felipe Garcia.en_US
dc.contributor.authorPrieto, Felipe Garcia.en_US
dc.date.issued1998en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractWetlands along the Lower Colorado River are divided into three types based on degree of connectivity to the river mainstem: connected lakes, pseudo seeps, and true seeps. In general, water quality and selenium levels in biota decrease with decreased connectivity to the river, i.e., true seeps have the poorest water quality and lowest selenium burdens, connected lakes have water quality equal to the river and the highest selenium levels, and pseudo seeps have water quality slightly improved over that in connected lakes and lower selenium levels. Based on selenium standards developed by Lemly (1995), selenium concentrations in fish but not crayfish were sufficiently elevated to pose bioaccumulation problems, though none were apparent in our study .Of the three wetland types, pseudo seeps have the most desirable combination of high water quality and modest selenium levels. Additionally, pseudo seeps may harbor the highest biodiversity of the three wetland types present in the LCR. The lack of apparent problems from elevated selenium levels raises many questions concerning selenium dynamics and cycling in the LCR. Management requires knowledge of selenium levels in individual wetland types and an understanding of selenium cycling.en_US
dc.description.notehydrology collectionen_US
dc.typeThesis-Reproduction (electronic)en_US
dc.typetexten_US
dc.subject.lcshHydrology.en_US
dc.subject.lcshWetland ecology -- Arizona.en_US
dc.subject.lcshSelenium cycle -- Arizona.en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineRenewable Natural Resourcesen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.chairMcIvor, Carole C.en_US
dc.contributor.committeememberMaughan, O. Eugeneen_US
dc.contributor.committeememberShaw, William W.en_US
dc.identifier.oclc213330050en_US
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