ENDOCRINE EFFECTS OF THE HERBICIDE LINURON ON THE AMERICAN GOLDFINCH (CARDUELIS TRISTIS) (Efectos Endocrinos del Herbicida Linuron sobre Carduelis tristis)

Publication Type:Journal Article
Year of Publication:2008
Authors:SUGHRUE, KARENM, Brittingham, MC, JR., JOHNBFRENCH
Journal:The Auk
Volume:125
Issue:2
Date Published:2008
ISBN Number:00048038
Keywords:Astragalinus, Astragalinus tristis, Carduelis, Carduelis carduelis, Carduelis tristis, Fringillidae, Pseudomitris, Pseudomitris tristis, Spinus, Spinus tristis
Abstract:ABSTRACT Certain contaminants alter normal physiological function, morphology, and behavior of exposed organisms through an endocrine mechanism. We evaluated how the herbicide linuron, an endocrine-active compound, affects physiological parameters and secondary sex characteristics of the American Goldfinch (Carduelis tristis). When administered at relatively low doses (control, 1.0, 4.0, and 16.0 μg linuron per gram of body mass per day), linuron delayed prealternate molt progression in a dose-dependent manner. At the high dose level, linuron exposure lowered hematocrit and female plasma thyroxine concentrations and increased body mass. Neither plasma testosterone concentrations nor the color of plumage or integument of birds in the treatment groups were different from those of the control group. Overall, the physiological effects that were measured suggested disruption of thyroid function. These results highlight the importance of continual monitoring of avian populations for potential effects of exposure to pesticides and other chemicals at sublethal concentrations.
URL:http://www.jstor.org/stable/10.1525/auk.2008.06264
Short Title:The Auk
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith