NDLI: Atrazine and increased male production by Daphnia: the importance of combining field and laboratory approaches.

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Atrazine and increased male production by Daphnia: the importance of combining field and laboratory approaches.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Stoeckel, James A. González, María J. Oris, James T. Kovach, Mathew J. Mace, Kimberly M.
Description	Country affiliation: United States Author Affiliation: Stoeckel JA ( Department of Zoology, Miami University, Oxford, Ohio 45056, USA. jimstoeckel@auburn.edu)
Abstract	Atrazine is one of the most commonly applied herbicides in North America and annually pulses through many midwestern stream and reservoir systems. Previous studies have yielded conflicting results regarding the ability of atrazine to stimulate male production by Daphnia, an effect hypothesized to lower population growth rates during a period of intense larval fish predation. In the present study, populations of Daphnia parvula and Daphnia ambigua exhibited high proportions of males but no ephippial females when atrazine pulsed into Acton Lake, a small midwestern reservoir. Field results thus supported the hypothesis of excess male production by Daphnia during the spring herbicide pulse. In laboratory studies, dose-response studies, and population-level assays revealed no effect of atrazine on male production or population growth rate of multiple clones differing in reproductive strategy and exposure history. However, D. parvula increased male production in response to an endogenous crustacean hormone (methyl farnesoate). Excess male production observed in the field population was therefore not likely caused by atrazine, although we cannot rule out the possibility of interactive effects of atrazine and some other stressor. Apparent signs of endocrine disruption in the presence of high concentrations of a suspected agent should be viewed with caution in the absence of parallel laboratory studies involving individuals from the populations of interest.
File Format	HTM / HTML
ISSN	07307268
Issue Number	11
Volume Number	27
e-ISSN	15528618
Journal	Environmental Toxicology and Chemistry
Language	English
Publisher	Wiley
Publisher Date	2008-11-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Research Support, U.s. Gov't, Non-p.h.s. Research Support, Non-u.s. Gov't Population Growth Toxicity Discipline Environmental Health Discipline Toxicology Male Drug Effects Journal Article Herbicides Animals Dose-response Relationship, Drug Daphnia Discipline Chemistry Female Physiology Atrazine
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Health, Toxicology and Mutagenesis

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