Feminization of Longnose Dace (Rhinichthys cataractae) in the Oldman River, Alberta, (Canada) Provides Evidence of Widespread Endocrine Disruption in an Agricultural Basin
Joint Authors
Evans, Joyce S.
Ikonomou, Michael G.
Jackson, Leland J.
Habibi, Hamid R.
Source
Issue
Vol. 2012, Issue 2012 (31 Dec. 2012), pp.1-11, 11 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2012-09-13
Country of Publication
Egypt
No. of Pages
11
Main Subjects
Natural & Life Sciences (Multidisciplinary)
Diseases
Abstract EN
We sampled an abundant, native minnow (Longnose dace—Rhinichthys cataractae) throughout the Oldman River, Alberta, to determine physiological responses and possible population level consequences from exposure to compounds with hormone-like activity.
Sex ratios varied between sites, were female-biased, and ranged from just over 50% to almost 90%.
Histological examination of gonads revealed that at the sites with >60% females in the adult population, there was up to 38% occurrence of intersex gonads in fish identified through visual examination of the gonads as male.
In the majority of intersex gonad cases, there was a large proportion (approx., 50%) of oocytes within the testicular tissue.
In male dace, vitellogenin mRNA expression generally increased with distance downstream.
We analyzed river water for 28 endocrine disrupting compounds from eight functional classes, most with confirmed estrogen-like activity, including synthetic estrogens and hormone therapy drugs characteristic of municipal wastewater effluent, plus natural hormones and veterinary pharmaceuticals characteristic of livestock production.
The spatial correlation between detected chemical residues and effects to dace physiology indicate that multiple land uses have a cumulative impact on dace in the Oldman River and effects range from altered gene regulation to severely female-biased sex ratios.
American Psychological Association (APA)
Evans, Joyce S.& Jackson, Leland J.& Habibi, Hamid R.& Ikonomou, Michael G.. 2012. Feminization of Longnose Dace (Rhinichthys cataractae) in the Oldman River, Alberta, (Canada) Provides Evidence of Widespread Endocrine Disruption in an Agricultural Basin. Scientifica،Vol. 2012, no. 2012, pp.1-11.
https://search.emarefa.net/detail/BIM-478390
Modern Language Association (MLA)
Evans, Joyce S.…[et al.]. Feminization of Longnose Dace (Rhinichthys cataractae) in the Oldman River, Alberta, (Canada) Provides Evidence of Widespread Endocrine Disruption in an Agricultural Basin. Scientifica No. 2012 (2012), pp.1-11.
https://search.emarefa.net/detail/BIM-478390
American Medical Association (AMA)
Evans, Joyce S.& Jackson, Leland J.& Habibi, Hamid R.& Ikonomou, Michael G.. Feminization of Longnose Dace (Rhinichthys cataractae) in the Oldman River, Alberta, (Canada) Provides Evidence of Widespread Endocrine Disruption in an Agricultural Basin. Scientifica. 2012. Vol. 2012, no. 2012, pp.1-11.
https://search.emarefa.net/detail/BIM-478390
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-478390