Thyroid hormones and halogenated organic compounds in black-legged kittiwake (Rissa tridactyla) and northern fulmar (Fulmarus glacialis)

Thyroid hormones are essential for normal growth and development and disruption of thyroid homeostasis can be critical to young developing individuals. The aim of the present study was to assess plasma concentrations of halogenated organic contaminants (HOCs) in chicks of two seabird species and to investigate possible correlations of HOCs with circulating thyroid hormone (TH) concentrations. Plasma from black-legged kittiwake (Rissa tridactyla) and northern fulmar (Fulmarus glacialis) chicks were sampled in Kongsfjorden, Svalbard in 2006. The samples were analyzed for thyroid hormones and a wide range of HOCs (polychlorinated biphenyls (PCBs), hydroxylated (OH-) and methylsulphoned (MeSO-) PCB metabolites, organochlorine pesticides (OCPs), brominated flame retardants (BFRs), and perfluorinated compounds (PFCs)). Concentrations of HOCs were generally low in kittiwake and fulmar chicks compared to previous reports. HOC concentrations were five times higher in fulmar chicks compared to in kittiwake chicks. PFCs dominated the summed HOCs concentrations in both species (77% in kittiwakes and 69% in fulmars). Positive associations between total thyroxin (TT4) and PFCs (PFHpS, PFOS, PFNA) were found in both species. Although correlations do not implicate causal relationships per se, the correlations are of concern as disruption of TH homeostasis may cause developmental effects in young birds.

Summary of proceedings and testimony from the Public Forum for the Development of a National Research Strategy for Neurological and Communicative Disorders /

"June 1, 1979."

Integrated motorist information (IMIS) feasibility and design study. Phase II: generalized methodology for IMIS feasibility studies. Volume 2--validation and application of feasibility study handbook. Final report.

Federal Highway Administration, Office of Research and Development, Washington, D.C.

Texts and studies in Jewish history and literature,

Errata slip inserted between p. [vii] and viii of v. 1 and p. [iv] and v of v. 2.

Fluorescence studies of plutonium, neptunium, and americium /

Includes bibliographical references (p. 14-15).

The impact of Department of Defense procurement on competition in commercial markets : case studies of the electronics and helicopter industries /

"December 1980."

Basic studies in heat transfer and fluid flow.

"Quarterly progress report".

Sheltered care and home services for public assistance recipients : with a note on methods of conducting studies of public assistance administration.

"Selected reading references" : pages 143-149.

Equilibrium studies with certain acids and minerals and their probable relation to the decomposition of minerals by bacteria,

Published also as thesis (Ph.D) University of California, 1919.

Studies of environmental plutonium and other transuranics in desert ecosystems : Nevada Applied Ecology Group Progress report...

Includes bibliographical references.

Solid-state metallurgy studies of pure columbium and Cb-1 Zr alloy /

"Contract AT(11-1)-229."